From f0ecd9cdbc3d816a0ef0efe2f512008fc0db423b Mon Sep 17 00:00:00 2001
From: hongyijie06 <hongyijie06@gmail.com>
Date: Fri, 26 Jan 2024 16:59:27 +0800
Subject: [PATCH 01/28] add chatbot name

---
 src/main/java/Duke.java | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/src/main/java/Duke.java b/src/main/java/Duke.java
index 5d313334c..9478f0d61 100644
--- a/src/main/java/Duke.java
+++ b/src/main/java/Duke.java
@@ -1,10 +1,8 @@
 public class Duke {
     public static void main(String[] args) {
-        String logo = " ____        _        \n"
-                + "|  _ \\ _   _| | _____ \n"
-                + "| | | | | | | |/ / _ \\\n"
-                + "| |_| | |_| |   <  __/\n"
-                + "|____/ \\__,_|_|\\_\\___|\n";
-        System.out.println("Hello from\n" + logo);
+
+        System.out.println("Hello! I'm apple");
+        System.out.println("What can I do for you?");
+        System.out.println("Bye. Hope to see you again soon!");
     }
 }

From e0b6eeda26c7b64e6df39652a16d12b867e9bcf4 Mon Sep 17 00:00:00 2001
From: hongyijie06 <hongyijie06@gmail.com>
Date: Wed, 7 Feb 2024 15:05:17 +0800
Subject: [PATCH 02/28] Add echo

---
 src/main/java/Duke.class | Bin 0 -> 943 bytes
 src/main/java/Duke.java  |  22 ++++++++++++++++++++++
 2 files changed, 22 insertions(+)
 create mode 100644 src/main/java/Duke.class

diff --git a/src/main/java/Duke.class b/src/main/java/Duke.class
new file mode 100644
index 0000000000000000000000000000000000000000..76684001fa063128c0fa14299c16df64af123ea0
GIT binary patch
literal 943
zcmZuw-A)rh6#k|yyW3?EC=?Jyr~c7Ge-seK8com`ngE*AXw<7|8QX>JZf$psO^jaa
z8^{ZI;gwvJL=zvtXEEM;fqG_Zf))4ToU`ZWJLfwy^Y!PaF95EfXkr-Cah$+O12ZO0
z;j{s+Bc)ttOlUZ(#5n`!O-$l~60-)<Ix;%u7_{rQYx_4CqUp>7hS)7{OEL_v+pgRU
z8Wq{PFDedsVhv%t3=`=m>)YbFC^*8c70Q0gc56jdI8^pUb!S5~!+ag{3})F2T2*<+
zR`v1Q!H&$UQVSy()seN3L!Mz|O*)R3;-%RJ7tN+4brdXI#3gF>ur7RF6)rFFEssC-
zTD;>0HyK955dz<K3S|nrvSncbiwb$k!euNIok~Yqw4bXMR&b4huXbdfuX#<$eUG=L
zR8U;hh!t;po|__yYD607kl)?PwygSnt{&xnSEudE2DS78%1!q6V|#^rv>c!ErDzlx
z#zNSBH-p|(Ne*o`ng0J`BWmr3pe45%9D+{$DI(av1L{BwSHAGoF*1y&Ge@!M=;gCO
zIPHI0_c#|bj|rkK+V$RrpxaSG3diWOsV@TB07gkB=x>HJBRw#;5B8A^VoOpBol(Rw
zjwIPC^&6rXApLd^kwmnMn9>8JKSO)82YnyL`g|Ahjcmf~VsIDLBZ1AxaxB+{^?_jM
zx~p#N)pyc~Tv+oCT68&<jD_);FiwKLgz7a!z1|~AW>#6hcGbL*aNY%2WNR>>6FHOK
z&mcHa&JgJ(@~jX8pSZjvHm@;_H`INCDyE<vs3)iCm^{EDNj5n417@5in+nm7{{|cW
B$=(0}

literal 0
HcmV?d00001

diff --git a/src/main/java/Duke.java b/src/main/java/Duke.java
index 9478f0d61..7f9a73cca 100644
--- a/src/main/java/Duke.java
+++ b/src/main/java/Duke.java
@@ -1,8 +1,30 @@
+import java.util.Scanner;
+
 public class Duke {
     public static void main(String[] args) {
 
         System.out.println("Hello! I'm apple");
         System.out.println("What can I do for you?");
+
+       
+
+        String line = "";
+
+
+        
+        while (!line.equals("bye")){
+            Scanner input = new Scanner(System.in);
+            line = input.nextLine();
+            
+
+            if (line.equals("bye")){
+                break;
+            }
+
+            System.out.println(line);
+        }
         System.out.println("Bye. Hope to see you again soon!");
+        
+        
     }
 }

From 35ec609da73aa0b0b920aba737871704d1ace3f1 Mon Sep 17 00:00:00 2001
From: hongyijie06 <hongyijie06@gmail.com>
Date: Wed, 7 Feb 2024 15:26:12 +0800
Subject: [PATCH 03/28] add Add,list

---
 src/main/java/Duke.java | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/src/main/java/Duke.java b/src/main/java/Duke.java
index 7f9a73cca..c86df838a 100644
--- a/src/main/java/Duke.java
+++ b/src/main/java/Duke.java
@@ -2,11 +2,12 @@
 
 public class Duke {
     public static void main(String[] args) {
+        String list[] = new String[100];
 
         System.out.println("Hello! I'm apple");
         System.out.println("What can I do for you?");
 
-       
+       int index = 0;
 
         String line = "";
 
@@ -15,13 +16,27 @@ public static void main(String[] args) {
         while (!line.equals("bye")){
             Scanner input = new Scanner(System.in);
             line = input.nextLine();
-            
 
             if (line.equals("bye")){
                 break;
             }
 
-            System.out.println(line);
+            if (line.equals("list")){
+                for (int i = 0; i < index; i ++) {
+
+                    System.out.println((i + 1) + ". " + list[i]);
+                }
+            }else {
+                list[index] = line;
+                System.out.println("added: " + line);
+            }
+
+            index ++;
+            
+
+
+
+
         }
         System.out.println("Bye. Hope to see you again soon!");
         

From 0c167248e0c87e57066436708fbf29340460d22f Mon Sep 17 00:00:00 2001
From: hongyijie06 <hongyijie06@gmail.com>
Date: Fri, 9 Feb 2024 15:21:54 +0800
Subject: [PATCH 04/28] add mark as done

---
 src/main/java/Duke.java | 83 ++++++++++++++++++++++-------------------
 src/main/java/Task.java | 24 ++++++++++++
 2 files changed, 68 insertions(+), 39 deletions(-)
 create mode 100644 src/main/java/Task.java

diff --git a/src/main/java/Duke.java b/src/main/java/Duke.java
index c86df838a..930f6e9c7 100644
--- a/src/main/java/Duke.java
+++ b/src/main/java/Duke.java
@@ -1,45 +1,50 @@
 import java.util.Scanner;
 
 public class Duke {
-    public static void main(String[] args) {
-        String list[] = new String[100];
-
-        System.out.println("Hello! I'm apple");
-        System.out.println("What can I do for you?");
-
-       int index = 0;
-
-        String line = "";
-
-
-        
-        while (!line.equals("bye")){
-            Scanner input = new Scanner(System.in);
-            line = input.nextLine();
-
-            if (line.equals("bye")){
-                break;
-            }
-
-            if (line.equals("list")){
-                for (int i = 0; i < index; i ++) {
-
-                    System.out.println((i + 1) + ". " + list[i]);
-                }
-            }else {
-                list[index] = line;
-                System.out.println("added: " + line);
-            }
-
-            index ++;
-            
-
-
-
-
+  public static void main(String[] args) {
+    Task[] list = new Task[100];
+
+
+
+    //greeting
+    System.out.println("Hello! I'm Apple");
+    System.out.println("What can I do for you?");
+
+    int index = 0;//number of items in the list
+    String line =" ";
+
+    while (!line.equals("bye")) {
+      Scanner input = new Scanner(System.in);
+      line = input.nextLine();
+
+      Task t = new Task(line);
+      String[] inputs = line.split(" ");
+
+      if (inputs[0].equals("mark")){//mark as done
+        int idx = Integer.parseInt(inputs[1]);
+        list[idx - 1].markAsDone();
+        System.out.println("Nice! I've marked this task as done: ");
+        System.out.println("[" + list[idx - 1].getStatusIcon()+ "]" + list[idx - 1].description);
+      } else if(inputs[0].equals("unmark")){//unmark done
+        int idx = Integer.parseInt(inputs[1]);
+        list[idx - 1].unmarkDone();
+        System.out.println("OK, I've marked this task as not done yet: ");
+        System.out.println("[" + list[idx - 1].getStatusIcon()+ "]" + list[idx - 1].description);
+      }else if (line.equals("list")) {//lists items
+        System.out.println("Here are the tasks in your list: ");
+        for (int i = 0; i < index; i++) {
+          System.out.println((i + 1) + ". [" + list[i].getStatusIcon()+ "]" + list[i].description);
         }
-        System.out.println("Bye. Hope to see you again soon!");
-        
-        
+      }else if (line.equals("bye")) {//exit chat
+        break;
+      }else {//add items
+        list[index] = t;
+        System.out.println("added: " + t.description);
+        index ++;
+      }
+
     }
+    System.out.println("Bye. Hope to see you again soon!");
+  }
+
 }
diff --git a/src/main/java/Task.java b/src/main/java/Task.java
new file mode 100644
index 000000000..458b67c4c
--- /dev/null
+++ b/src/main/java/Task.java
@@ -0,0 +1,24 @@
+public class Task {
+  protected String description;
+  protected int taskIndex;
+  protected boolean isDone;
+
+  public Task(String description) {
+    this.description = description;
+    this.isDone = false;
+  }
+
+  public String getStatusIcon() {
+    return (isDone ? "X" : " "); // mark done task with X
+  }
+
+  public void markAsDone(){
+    this.isDone = true;
+
+  }
+
+  public void unmarkDone(){
+    this.isDone = false;
+  }
+}
+

From 1b6ca15d9aaa88aa5a7a834645c3e6f233cda887 Mon Sep 17 00:00:00 2001
From: hongyijie06 <hongyijie06@gmail.com>
Date: Fri, 9 Feb 2024 16:49:51 +0800
Subject: [PATCH 05/28] add A-CodingStandard

---
 src/main/java/Duke.java | 84 ++++++++++++++++++++---------------------
 src/main/java/Task.java | 33 ++++++++--------
 2 files changed, 56 insertions(+), 61 deletions(-)

diff --git a/src/main/java/Duke.java b/src/main/java/Duke.java
index 930f6e9c7..66a0d3db4 100644
--- a/src/main/java/Duke.java
+++ b/src/main/java/Duke.java
@@ -1,50 +1,48 @@
 import java.util.Scanner;
 
 public class Duke {
-  public static void main(String[] args) {
-    Task[] list = new Task[100];
-
-
-
-    //greeting
-    System.out.println("Hello! I'm Apple");
-    System.out.println("What can I do for you?");
-
-    int index = 0;//number of items in the list
-    String line =" ";
-
-    while (!line.equals("bye")) {
-      Scanner input = new Scanner(System.in);
-      line = input.nextLine();
-
-      Task t = new Task(line);
-      String[] inputs = line.split(" ");
-
-      if (inputs[0].equals("mark")){//mark as done
-        int idx = Integer.parseInt(inputs[1]);
-        list[idx - 1].markAsDone();
-        System.out.println("Nice! I've marked this task as done: ");
-        System.out.println("[" + list[idx - 1].getStatusIcon()+ "]" + list[idx - 1].description);
-      } else if(inputs[0].equals("unmark")){//unmark done
-        int idx = Integer.parseInt(inputs[1]);
-        list[idx - 1].unmarkDone();
-        System.out.println("OK, I've marked this task as not done yet: ");
-        System.out.println("[" + list[idx - 1].getStatusIcon()+ "]" + list[idx - 1].description);
-      }else if (line.equals("list")) {//lists items
-        System.out.println("Here are the tasks in your list: ");
-        for (int i = 0; i < index; i++) {
-          System.out.println((i + 1) + ". [" + list[i].getStatusIcon()+ "]" + list[i].description);
-        }
-      }else if (line.equals("bye")) {//exit chat
-        break;
-      }else {//add items
-        list[index] = t;
-        System.out.println("added: " + t.description);
-        index ++;
-      }
+    public static void main(String[] args) {
+        Task[] list = new Task[100];
+
+        //greeting
+        System.out.println("Hello! I'm Apple");
+        System.out.println("What can I do for you?");
+
+        int index = 0;//number of items in the list
+        String line = " ";
+
+        while (!line.equals("bye")) {
+            Scanner input = new Scanner(System.in);
+            line = input.nextLine();
+
+            Task t = new Task(line);
+            String[] inputs = line.split(" ");
+
+            if (inputs[0].equals("mark")) {//mark as done
+                int idx = Integer.parseInt(inputs[1]);
+                list[idx - 1].markAsDone();
+                System.out.println("Nice! I've marked this task as done: ");
+                System.out.println("[" + list[idx - 1].getStatusIcon() + "]" + list[idx - 1].description);
+            } else if (inputs[0].equals("unmark")) {//unmark done
+                int idx = Integer.parseInt(inputs[1]);
+                list[idx - 1].unmarkDone();
+                System.out.println("OK, I've marked this task as not done yet: ");
+                System.out.println("[" + list[idx - 1].getStatusIcon() + "]" + list[idx - 1].description);
+            } else if (line.equals("list")) {//lists items
+                System.out.println("Here are the tasks in your list: ");
+                for (int i = 0; i < index; i++) {
+                    System.out.println((i + 1) + ". [" + list[i].getStatusIcon() + "]" + list[i].description);
+                }
+            } else if (line.equals("bye")) {//exit chat
+                break;
+            } else {//add items
+                list[index] = t;
+                System.out.println("added: " + t.description);
+                index++;
+            }
 
+        }
+        System.out.println("Bye. Hope to see you again soon!");
     }
-    System.out.println("Bye. Hope to see you again soon!");
-  }
 
 }
diff --git a/src/main/java/Task.java b/src/main/java/Task.java
index 458b67c4c..bd2bbd58a 100644
--- a/src/main/java/Task.java
+++ b/src/main/java/Task.java
@@ -1,24 +1,21 @@
 public class Task {
-  protected String description;
-  protected int taskIndex;
-  protected boolean isDone;
+    protected String description;
+    protected boolean isDone;
+    public Task(String description) {
+        this.description = description;
+        this.isDone = false;
+    }
 
-  public Task(String description) {
-    this.description = description;
-    this.isDone = false;
-  }
+    public String getStatusIcon() {
+        return (isDone ? "X" : " "); // mark done task with X
+    }
 
-  public String getStatusIcon() {
-    return (isDone ? "X" : " "); // mark done task with X
-  }
+    public void markAsDone() {
+        this.isDone = true;
+    }
 
-  public void markAsDone(){
-    this.isDone = true;
-
-  }
-
-  public void unmarkDone(){
-    this.isDone = false;
-  }
+    public void unmarkDone() {
+        this.isDone = false;
+    }
 }
 

From 6ef3078ef99ac0a9d393d5279651eb9a475b2015 Mon Sep 17 00:00:00 2001
From: hongyijie06 <hongyijie06@gmail.com>
Date: Fri, 16 Feb 2024 22:41:43 +0800
Subject: [PATCH 06/28] add todo, deadline and event

---
 src/main/java/Deadline.java | 13 +++++++++
 src/main/java/Duke.java     | 53 ++++++++++++++++++++++++++++++++++---
 src/main/java/Event.java    | 15 +++++++++++
 src/main/java/Task.java     |  4 +++
 src/main/java/Todo.java     | 11 ++++++++
 5 files changed, 93 insertions(+), 3 deletions(-)
 create mode 100644 src/main/java/Deadline.java
 create mode 100644 src/main/java/Event.java
 create mode 100644 src/main/java/Todo.java

diff --git a/src/main/java/Deadline.java b/src/main/java/Deadline.java
new file mode 100644
index 000000000..bcd049672
--- /dev/null
+++ b/src/main/java/Deadline.java
@@ -0,0 +1,13 @@
+public class Deadline extends Task{
+    protected String by;
+
+    public Deadline(String description, String by) {
+        super(description);
+        this.by = by;
+    }
+
+    @Override
+    public String toString() {
+        return "[D]" + super.toString() + " (by: " + by + ")";
+    }
+}
diff --git a/src/main/java/Duke.java b/src/main/java/Duke.java
index 66a0d3db4..3aa5413d2 100644
--- a/src/main/java/Duke.java
+++ b/src/main/java/Duke.java
@@ -1,6 +1,39 @@
 import java.util.Scanner;
 
 public class Duke {
+    protected static String from;
+    protected static String to;
+
+
+    public String description;
+
+    public static void dealWithEvent(Task[] list, int index, String[] inputs, String line){
+        int indexTo = line.indexOf("/to");
+        int indexFrom = line.indexOf("/from");
+        String from = line.substring(indexFrom + 6, indexTo - 1);
+        String to = line.substring(indexTo + 4);
+        String description = line.substring(6, indexFrom - 1);
+
+        list[index] = new Event(description, from, to);
+        System.out.println("Got it. I've added this task: ");
+        System.out.println(list[index]);
+    }
+    public static void dealWithDeadline(Task[] list, int index, String line){
+        int indexBy = line.indexOf("by");
+        String by = line.substring(indexBy + 3);
+        String description = line.substring(0, indexBy - 1);
+        list[index] = new Deadline(description, by);
+        System.out.println("Got it. I've added this task: ");
+        System.out.println(list[index]);
+    }
+
+    public static void dealWithTodo(Task[] list, int index, String line){
+        int indexSpace = line.indexOf(" ");
+        String description = line.substring(indexSpace);
+        list[index] = new Todo(description);
+        System.out.println("Got it. I've added this task: ");
+        System.out.println(list[index]);
+    }
     public static void main(String[] args) {
         Task[] list = new Task[100];
 
@@ -31,16 +64,30 @@ public static void main(String[] args) {
             } else if (line.equals("list")) {//lists items
                 System.out.println("Here are the tasks in your list: ");
                 for (int i = 0; i < index; i++) {
-                    System.out.println((i + 1) + ". [" + list[i].getStatusIcon() + "]" + list[i].description);
+                    //System.out.println((i + 1) + ". [" + list[i].getStatusIcon() + "]" + list[i].description);
+                    System.out.println((i + 1) + ". " + list[i]);
                 }
             } else if (line.equals("bye")) {//exit chat
                 break;
             } else {//add items
-                list[index] = t;
-                System.out.println("added: " + t.description);
+
+                if (inputs[0].equals("event")) {
+                    dealWithEvent(list, index, inputs, line);
+
+                } else if (inputs[0].equals("deadline")){
+                    dealWithDeadline(list, index, line);
+                } else if (inputs[0].equals("todo")){
+                    dealWithTodo(list, index, line);
+                }
+                System.out.println("Now you have " + (index + 1) + " tasks in the list.");
+                //System.out.println(from);
+                //System.out.println(to);
+
                 index++;
             }
 
+
+
         }
         System.out.println("Bye. Hope to see you again soon!");
     }
diff --git a/src/main/java/Event.java b/src/main/java/Event.java
new file mode 100644
index 000000000..8a985596a
--- /dev/null
+++ b/src/main/java/Event.java
@@ -0,0 +1,15 @@
+public class Event extends Task{
+
+
+    protected String from;
+    protected String to;
+    public Event(String description, String from, String to){
+        super(description);
+        this.from = from;
+        this.to = to;
+    }
+    @Override
+    public String toString() {
+        return "[E]" + super.toString() + " (from: " + from + " to: " + to + ")";
+    }
+}
diff --git a/src/main/java/Task.java b/src/main/java/Task.java
index bd2bbd58a..87b80a79e 100644
--- a/src/main/java/Task.java
+++ b/src/main/java/Task.java
@@ -17,5 +17,9 @@ public void markAsDone() {
     public void unmarkDone() {
         this.isDone = false;
     }
+
+    public String toString(){
+        return "[" + getStatusIcon() + "]" + description;
+    }
 }
 
diff --git a/src/main/java/Todo.java b/src/main/java/Todo.java
new file mode 100644
index 000000000..3e9d6ee7a
--- /dev/null
+++ b/src/main/java/Todo.java
@@ -0,0 +1,11 @@
+public class Todo extends Task{
+
+    public Todo(String description){
+        super(description);
+    }
+    @Override
+    public String toString() {
+        return "[T]" + super.toString();
+    }
+
+}

From b540106ed3d6520543d5b1a4a0fb826199257881 Mon Sep 17 00:00:00 2001
From: hongyijie06 <hongyijie06@gmail.com>
Date: Mon, 19 Feb 2024 18:11:22 +0800
Subject: [PATCH 07/28] add code quality

---
 src/main/java/Duke.java  | 48 ++++++++++++++++------------------------
 src/main/java/Event.java |  2 --
 2 files changed, 19 insertions(+), 31 deletions(-)

diff --git a/src/main/java/Duke.java b/src/main/java/Duke.java
index 3aa5413d2..0f4d9f844 100644
--- a/src/main/java/Duke.java
+++ b/src/main/java/Duke.java
@@ -3,39 +3,37 @@
 public class Duke {
     protected static String from;
     protected static String to;
-
-
     public String description;
 
-    public static void dealWithEvent(Task[] list, int index, String[] inputs, String line){
+    public static void dealWithEvent(Task[] tasks, int index, String[] inputs, String line){
         int indexTo = line.indexOf("/to");
         int indexFrom = line.indexOf("/from");
         String from = line.substring(indexFrom + 6, indexTo - 1);
         String to = line.substring(indexTo + 4);
         String description = line.substring(6, indexFrom - 1);
 
-        list[index] = new Event(description, from, to);
+        tasks[index] = new Event(description, from, to);
         System.out.println("Got it. I've added this task: ");
-        System.out.println(list[index]);
+        System.out.println(tasks[index]);
     }
-    public static void dealWithDeadline(Task[] list, int index, String line){
+    public static void dealWithDeadline(Task[] tasks, int index, String line){
         int indexBy = line.indexOf("by");
         String by = line.substring(indexBy + 3);
         String description = line.substring(0, indexBy - 1);
-        list[index] = new Deadline(description, by);
+        tasks[index] = new Deadline(description, by);
         System.out.println("Got it. I've added this task: ");
-        System.out.println(list[index]);
+        System.out.println(tasks[index]);
     }
 
-    public static void dealWithTodo(Task[] list, int index, String line){
+    public static void dealWithTodo(Task[] tasks, int index, String line){
         int indexSpace = line.indexOf(" ");
         String description = line.substring(indexSpace);
-        list[index] = new Todo(description);
+        tasks[index] = new Todo(description);
         System.out.println("Got it. I've added this task: ");
-        System.out.println(list[index]);
+        System.out.println(tasks[index]);
     }
     public static void main(String[] args) {
-        Task[] list = new Task[100];
+        Task[] tasks = new Task[100];
 
         //greeting
         System.out.println("Hello! I'm Apple");
@@ -53,43 +51,35 @@ public static void main(String[] args) {
 
             if (inputs[0].equals("mark")) {//mark as done
                 int idx = Integer.parseInt(inputs[1]);
-                list[idx - 1].markAsDone();
+                tasks[idx - 1].markAsDone();
                 System.out.println("Nice! I've marked this task as done: ");
-                System.out.println("[" + list[idx - 1].getStatusIcon() + "]" + list[idx - 1].description);
+                System.out.println("[" + tasks[idx - 1].getStatusIcon() + "]" + tasks[idx - 1].description);
             } else if (inputs[0].equals("unmark")) {//unmark done
                 int idx = Integer.parseInt(inputs[1]);
-                list[idx - 1].unmarkDone();
+                tasks[idx - 1].unmarkDone();
                 System.out.println("OK, I've marked this task as not done yet: ");
-                System.out.println("[" + list[idx - 1].getStatusIcon() + "]" + list[idx - 1].description);
-            } else if (line.equals("list")) {//lists items
+                System.out.println("[" + tasks[idx - 1].getStatusIcon() + "]" + tasks[idx - 1].description);
+            } else if (line.equals("list")) {//lists tasks
                 System.out.println("Here are the tasks in your list: ");
                 for (int i = 0; i < index; i++) {
-                    //System.out.println((i + 1) + ". [" + list[i].getStatusIcon() + "]" + list[i].description);
-                    System.out.println((i + 1) + ". " + list[i]);
+                    System.out.println((i + 1) + ". " + tasks[i]);
                 }
             } else if (line.equals("bye")) {//exit chat
                 break;
             } else {//add items
 
                 if (inputs[0].equals("event")) {
-                    dealWithEvent(list, index, inputs, line);
-
+                    dealWithEvent(tasks, index, inputs, line);
                 } else if (inputs[0].equals("deadline")){
-                    dealWithDeadline(list, index, line);
+                    dealWithDeadline(tasks, index, line);
                 } else if (inputs[0].equals("todo")){
-                    dealWithTodo(list, index, line);
+                    dealWithTodo(tasks, index, line);
                 }
                 System.out.println("Now you have " + (index + 1) + " tasks in the list.");
-                //System.out.println(from);
-                //System.out.println(to);
 
                 index++;
             }
-
-
-
         }
         System.out.println("Bye. Hope to see you again soon!");
     }
-
 }
diff --git a/src/main/java/Event.java b/src/main/java/Event.java
index 8a985596a..0c9973810 100644
--- a/src/main/java/Event.java
+++ b/src/main/java/Event.java
@@ -1,6 +1,4 @@
 public class Event extends Task{
-
-
     protected String from;
     protected String to;
     public Event(String description, String from, String to){

From c2302554e61de79479108a70d79e8a85e504f885 Mon Sep 17 00:00:00 2001
From: hongyijie06 <hongyijie06@gmail.com>
Date: Tue, 20 Feb 2024 12:26:34 +0800
Subject: [PATCH 08/28] add error handling

---
 src/main/java/Duke.java                       |  71 +---------
 src/main/java/EmptyLineException.java         |   2 +
 src/main/java/ManageInputs.java               | 127 ++++++++++++++++++
 src/main/java/UnexpectedCommandException.java |   2 +
 4 files changed, 133 insertions(+), 69 deletions(-)
 create mode 100644 src/main/java/EmptyLineException.java
 create mode 100644 src/main/java/ManageInputs.java
 create mode 100644 src/main/java/UnexpectedCommandException.java

diff --git a/src/main/java/Duke.java b/src/main/java/Duke.java
index 0f4d9f844..a09d411dc 100644
--- a/src/main/java/Duke.java
+++ b/src/main/java/Duke.java
@@ -1,38 +1,9 @@
 import java.util.Scanner;
 
 public class Duke {
-    protected static String from;
-    protected static String to;
-    public String description;
 
-    public static void dealWithEvent(Task[] tasks, int index, String[] inputs, String line){
-        int indexTo = line.indexOf("/to");
-        int indexFrom = line.indexOf("/from");
-        String from = line.substring(indexFrom + 6, indexTo - 1);
-        String to = line.substring(indexTo + 4);
-        String description = line.substring(6, indexFrom - 1);
 
-        tasks[index] = new Event(description, from, to);
-        System.out.println("Got it. I've added this task: ");
-        System.out.println(tasks[index]);
-    }
-    public static void dealWithDeadline(Task[] tasks, int index, String line){
-        int indexBy = line.indexOf("by");
-        String by = line.substring(indexBy + 3);
-        String description = line.substring(0, indexBy - 1);
-        tasks[index] = new Deadline(description, by);
-        System.out.println("Got it. I've added this task: ");
-        System.out.println(tasks[index]);
-    }
-
-    public static void dealWithTodo(Task[] tasks, int index, String line){
-        int indexSpace = line.indexOf(" ");
-        String description = line.substring(indexSpace);
-        tasks[index] = new Todo(description);
-        System.out.println("Got it. I've added this task: ");
-        System.out.println(tasks[index]);
-    }
-    public static void main(String[] args) {
+    public static void main(String[] args) throws UnexpectedCommandException, EmptyLineException {
         Task[] tasks = new Task[100];
 
         //greeting
@@ -42,44 +13,6 @@ public static void main(String[] args) {
         int index = 0;//number of items in the list
         String line = " ";
 
-        while (!line.equals("bye")) {
-            Scanner input = new Scanner(System.in);
-            line = input.nextLine();
-
-            Task t = new Task(line);
-            String[] inputs = line.split(" ");
-
-            if (inputs[0].equals("mark")) {//mark as done
-                int idx = Integer.parseInt(inputs[1]);
-                tasks[idx - 1].markAsDone();
-                System.out.println("Nice! I've marked this task as done: ");
-                System.out.println("[" + tasks[idx - 1].getStatusIcon() + "]" + tasks[idx - 1].description);
-            } else if (inputs[0].equals("unmark")) {//unmark done
-                int idx = Integer.parseInt(inputs[1]);
-                tasks[idx - 1].unmarkDone();
-                System.out.println("OK, I've marked this task as not done yet: ");
-                System.out.println("[" + tasks[idx - 1].getStatusIcon() + "]" + tasks[idx - 1].description);
-            } else if (line.equals("list")) {//lists tasks
-                System.out.println("Here are the tasks in your list: ");
-                for (int i = 0; i < index; i++) {
-                    System.out.println((i + 1) + ". " + tasks[i]);
-                }
-            } else if (line.equals("bye")) {//exit chat
-                break;
-            } else {//add items
-
-                if (inputs[0].equals("event")) {
-                    dealWithEvent(tasks, index, inputs, line);
-                } else if (inputs[0].equals("deadline")){
-                    dealWithDeadline(tasks, index, line);
-                } else if (inputs[0].equals("todo")){
-                    dealWithTodo(tasks, index, line);
-                }
-                System.out.println("Now you have " + (index + 1) + " tasks in the list.");
-
-                index++;
-            }
-        }
-        System.out.println("Bye. Hope to see you again soon!");
+        new ManageInputs(tasks, index, line);
     }
 }
diff --git a/src/main/java/EmptyLineException.java b/src/main/java/EmptyLineException.java
new file mode 100644
index 000000000..fd35912c9
--- /dev/null
+++ b/src/main/java/EmptyLineException.java
@@ -0,0 +1,2 @@
+public class EmptyLineException extends Exception{
+}
diff --git a/src/main/java/ManageInputs.java b/src/main/java/ManageInputs.java
new file mode 100644
index 000000000..02bbff9fa
--- /dev/null
+++ b/src/main/java/ManageInputs.java
@@ -0,0 +1,127 @@
+import java.util.Scanner;
+
+public class ManageInputs {
+    protected static String from;
+    protected static String to;
+    public String description;
+
+    public static void dealWithEvent(Task[] tasks, int index, String[] inputs, String line) throws UnexpectedCommandException {
+        int indexTo = line.indexOf("/to");
+        int indexFrom = line.indexOf("/from");
+
+        if ((indexTo == -1) || (indexFrom == -1)) {
+            System.out.println("remember to include a description and event timeline!");
+            throw new UnexpectedCommandException();
+        }
+        String from = line.substring(indexFrom + 6, indexTo - 1);
+        String to = line.substring(indexTo + 4);
+        String description = line.substring(6, indexFrom - 1);
+
+        tasks[index] = new Event(description, from, to);
+        System.out.println("Got it. I've added this task: ");
+        System.out.println(tasks[index]);
+    }
+
+    public static void dealWithDeadline(Task[] tasks, int index, String line) throws UnexpectedCommandException {
+        int indexBy = line.indexOf("by");
+        if (indexBy == -1) {
+            System.out.println("remember to include a description and a deadline!");
+            throw new UnexpectedCommandException();
+        }
+        String by = line.substring(indexBy + 3);
+        String description = line.substring(0, indexBy - 1);
+        tasks[index] = new Deadline(description, by);
+        System.out.println("Got it. I've added this task: ");
+        System.out.println(tasks[index]);
+    }
+
+    public static void dealWithTodo(Task[] tasks, int index, String line) throws UnexpectedCommandException {
+        int indexSpace = line.indexOf(" ");
+        if (indexSpace == -1) {
+            System.out.println("todo description cannot be empty");
+            throw new UnexpectedCommandException();
+        }
+
+        String description = line.substring(indexSpace);
+
+        tasks[index] = new Todo(description);
+        System.out.println("Got it. I've added this task: ");
+        System.out.println(tasks[index]);
+    }
+
+    private void handleUnexpectedCommand(boolean isValidCommand) throws UnexpectedCommandException {
+        if (!isValidCommand) {
+            throw new UnexpectedCommandException();
+        }
+    }
+
+    private void handleEmptyInput(String line) throws EmptyLineException {
+        if (line.isEmpty()) {
+            throw new EmptyLineException();
+        }
+    }
+
+    public ManageInputs(Task[] tasks, int index, String line){
+
+        while (!line.equals("bye")) {
+            Boolean isValidCommand = false;
+            Scanner input = new Scanner(System.in);
+            line = input.nextLine();
+
+            Task t = new Task(line);
+            String[] inputs = line.split(" ");
+
+            if (inputs[0].equals("mark")) {//mark as done
+                isValidCommand = true;
+                int idx = Integer.parseInt(inputs[1]);
+                tasks[idx - 1].markAsDone();
+                System.out.println("Nice! I've marked this task as done: ");
+                System.out.println("[" + tasks[idx - 1].getStatusIcon() + "]" + tasks[idx - 1].description);
+            } else if (inputs[0].equals("unmark")) {//unmark done
+                isValidCommand = true;
+                int idx = Integer.parseInt(inputs[1]);
+                tasks[idx - 1].unmarkDone();
+                System.out.println("OK, I've marked this task as not done yet: ");
+                System.out.println("[" + tasks[idx - 1].getStatusIcon() + "]" + tasks[idx - 1].description);
+            } else if (line.equals("list")) {//lists tasks
+                isValidCommand = true;
+                System.out.println("Here are the tasks in your list: ");
+                for (int i = 0; i < index; i++) {
+                    System.out.println((i + 1) + ". " + tasks[i]);
+                }
+            } else if (line.equals("bye")) {//exit chat
+                isValidCommand = true;
+                break;
+            } else if (inputs[0].equals("event") || inputs[0].equals("todo") || inputs[0].equals("deadline")) {//add items
+                try {
+                    if (inputs[0].equals("event")) {
+                        isValidCommand = true;
+                        dealWithEvent(tasks, index, inputs, line);
+                        index++;
+                    } else if (inputs[0].equals("deadline")) {
+                        isValidCommand = true;
+                        dealWithDeadline(tasks, index, line);
+                        index++;
+                    } else {
+                        isValidCommand = true;
+                        dealWithTodo(tasks, index, line);
+                        index++;
+                    }
+                    System.out.println("Now you have " + index + " tasks in the list.");
+                } catch (UnexpectedCommandException e) {
+
+                }
+            } else {
+                try {
+                    handleEmptyInput(line);
+                    handleUnexpectedCommand(isValidCommand);
+                } catch (UnexpectedCommandException e) {
+                    System.out.println("please enter a valid command");
+                } catch (EmptyLineException e){
+                    System.out.println("enter a task");
+                }
+            }
+        }
+        System.out.println("Bye. Hope to see you again soon!");
+    }
+}
diff --git a/src/main/java/UnexpectedCommandException.java b/src/main/java/UnexpectedCommandException.java
new file mode 100644
index 000000000..3d56bc38b
--- /dev/null
+++ b/src/main/java/UnexpectedCommandException.java
@@ -0,0 +1,2 @@
+public class UnexpectedCommandException extends Exception {
+}

From bedc8ec32b86d83940acdcb69ce5ddf192d49ecd Mon Sep 17 00:00:00 2001
From: hongyijie06 <hongyijie06@gmail.com>
Date: Tue, 20 Feb 2024 14:01:50 +0800
Subject: [PATCH 09/28] make error handling more error-specific

---
 src/main/java/ManageInputs.java | 67 ++++++++++++++++++++++++++-------
 1 file changed, 53 insertions(+), 14 deletions(-)

diff --git a/src/main/java/ManageInputs.java b/src/main/java/ManageInputs.java
index 02bbff9fa..1ad4fa861 100644
--- a/src/main/java/ManageInputs.java
+++ b/src/main/java/ManageInputs.java
@@ -3,19 +3,37 @@
 public class ManageInputs {
     protected static String from;
     protected static String to;
-    public String description;
+    public static String description;
+    protected static String by;
+
 
     public static void dealWithEvent(Task[] tasks, int index, String[] inputs, String line) throws UnexpectedCommandException {
         int indexTo = line.indexOf("/to");
         int indexFrom = line.indexOf("/from");
 
-        if ((indexTo == -1) || (indexFrom == -1)) {
-            System.out.println("remember to include a description and event timeline!");
+        if ((indexTo == -1) || (indexFrom == -1)) { //invalid format
+            System.out.println("Invalid format! Enter event in the format: event (description) /from (start) /to (end)");
+            throw new UnexpectedCommandException();
+        }
+        try {//timeline not specified/ both not specified
+            String from = line.substring(indexFrom + 6, indexTo - 1);
+            String to = line.substring(indexTo + 4);
+        } catch (IndexOutOfBoundsException e) {
+            try {
+                String description = line.substring(6, indexFrom - 1);
+            } catch (IndexOutOfBoundsException f) {
+                System.out.println("event description and timeline not specified");
+                throw new UnexpectedCommandException();
+            }
+            System.out.println("event timeline not specified");
+            throw new UnexpectedCommandException();
+        }
+        try {//description not specified
+            String description = line.substring(6, indexFrom - 1);
+        } catch (IndexOutOfBoundsException e) {
+            System.out.println("event description not specified");
             throw new UnexpectedCommandException();
         }
-        String from = line.substring(indexFrom + 6, indexTo - 1);
-        String to = line.substring(indexTo + 4);
-        String description = line.substring(6, indexFrom - 1);
 
         tasks[index] = new Event(description, from, to);
         System.out.println("Got it. I've added this task: ");
@@ -24,12 +42,28 @@ public static void dealWithEvent(Task[] tasks, int index, String[] inputs, Strin
 
     public static void dealWithDeadline(Task[] tasks, int index, String line) throws UnexpectedCommandException {
         int indexBy = line.indexOf("by");
-        if (indexBy == -1) {
-            System.out.println("remember to include a description and a deadline!");
+        if (indexBy == -1) {//invalid format
+            System.out.println("Invalid format! Enter deadline in the format: deadline (description) by (deadline)");
+            throw new UnexpectedCommandException();
+        }
+        try {//deadline / both not specified
+            String by = line.substring(indexBy + 3);
+        } catch (IndexOutOfBoundsException e) {
+            try {
+                String description = line.substring(9, indexBy - 1);
+            } catch (IndexOutOfBoundsException f) {
+                System.out.println("deadline description and deadline not specified");
+                throw new UnexpectedCommandException();
+            }
+            System.out.println("deadline not specified");
+            throw new UnexpectedCommandException();
+        }
+        try {//deadline not specified
+            String description = line.substring(9, indexBy - 1);
+        } catch (IndexOutOfBoundsException e) {
+            System.out.println("deadline description not specified");
             throw new UnexpectedCommandException();
         }
-        String by = line.substring(indexBy + 3);
-        String description = line.substring(0, indexBy - 1);
         tasks[index] = new Deadline(description, by);
         System.out.println("Got it. I've added this task: ");
         System.out.println(tasks[index]);
@@ -38,7 +72,7 @@ public static void dealWithDeadline(Task[] tasks, int index, String line) throws
     public static void dealWithTodo(Task[] tasks, int index, String line) throws UnexpectedCommandException {
         int indexSpace = line.indexOf(" ");
         if (indexSpace == -1) {
-            System.out.println("todo description cannot be empty");
+            System.out.println("todo description not specified");
             throw new UnexpectedCommandException();
         }
 
@@ -61,8 +95,7 @@ private void handleEmptyInput(String line) throws EmptyLineException {
         }
     }
 
-    public ManageInputs(Task[] tasks, int index, String line){
-
+    public ManageInputs(Task[] tasks, int index, String line) {
         while (!line.equals("bye")) {
             Boolean isValidCommand = false;
             Scanner input = new Scanner(System.in);
@@ -117,7 +150,7 @@ public ManageInputs(Task[] tasks, int index, String line){
                     handleUnexpectedCommand(isValidCommand);
                 } catch (UnexpectedCommandException e) {
                     System.out.println("please enter a valid command");
-                } catch (EmptyLineException e){
+                } catch (EmptyLineException e) {
                     System.out.println("enter a task");
                 }
             }
@@ -125,3 +158,9 @@ public ManageInputs(Task[] tasks, int index, String line){
         System.out.println("Bye. Hope to see you again soon!");
     }
 }
+
+/*try{
+            handleFromUnspecified();
+        } catch (FromUnspecifiedError e){
+            System.out.println("remember to include start of event!");
+        }*/
\ No newline at end of file

From 4793c541ea1fe105390fec9bb05217c3159eddd1 Mon Sep 17 00:00:00 2001
From: hongyijie06 <hongyijie06@gmail.com>
Date: Tue, 20 Feb 2024 14:11:20 +0800
Subject: [PATCH 10/28] Revert "make error handling more error-specific"

This reverts commit bedc8ec32b86d83940acdcb69ce5ddf192d49ecd.
---
 src/main/java/ManageInputs.java | 67 +++++++--------------------------
 1 file changed, 14 insertions(+), 53 deletions(-)

diff --git a/src/main/java/ManageInputs.java b/src/main/java/ManageInputs.java
index 1ad4fa861..02bbff9fa 100644
--- a/src/main/java/ManageInputs.java
+++ b/src/main/java/ManageInputs.java
@@ -3,37 +3,19 @@
 public class ManageInputs {
     protected static String from;
     protected static String to;
-    public static String description;
-    protected static String by;
-
+    public String description;
 
     public static void dealWithEvent(Task[] tasks, int index, String[] inputs, String line) throws UnexpectedCommandException {
         int indexTo = line.indexOf("/to");
         int indexFrom = line.indexOf("/from");
 
-        if ((indexTo == -1) || (indexFrom == -1)) { //invalid format
-            System.out.println("Invalid format! Enter event in the format: event (description) /from (start) /to (end)");
-            throw new UnexpectedCommandException();
-        }
-        try {//timeline not specified/ both not specified
-            String from = line.substring(indexFrom + 6, indexTo - 1);
-            String to = line.substring(indexTo + 4);
-        } catch (IndexOutOfBoundsException e) {
-            try {
-                String description = line.substring(6, indexFrom - 1);
-            } catch (IndexOutOfBoundsException f) {
-                System.out.println("event description and timeline not specified");
-                throw new UnexpectedCommandException();
-            }
-            System.out.println("event timeline not specified");
-            throw new UnexpectedCommandException();
-        }
-        try {//description not specified
-            String description = line.substring(6, indexFrom - 1);
-        } catch (IndexOutOfBoundsException e) {
-            System.out.println("event description not specified");
+        if ((indexTo == -1) || (indexFrom == -1)) {
+            System.out.println("remember to include a description and event timeline!");
             throw new UnexpectedCommandException();
         }
+        String from = line.substring(indexFrom + 6, indexTo - 1);
+        String to = line.substring(indexTo + 4);
+        String description = line.substring(6, indexFrom - 1);
 
         tasks[index] = new Event(description, from, to);
         System.out.println("Got it. I've added this task: ");
@@ -42,28 +24,12 @@ public static void dealWithEvent(Task[] tasks, int index, String[] inputs, Strin
 
     public static void dealWithDeadline(Task[] tasks, int index, String line) throws UnexpectedCommandException {
         int indexBy = line.indexOf("by");
-        if (indexBy == -1) {//invalid format
-            System.out.println("Invalid format! Enter deadline in the format: deadline (description) by (deadline)");
-            throw new UnexpectedCommandException();
-        }
-        try {//deadline / both not specified
-            String by = line.substring(indexBy + 3);
-        } catch (IndexOutOfBoundsException e) {
-            try {
-                String description = line.substring(9, indexBy - 1);
-            } catch (IndexOutOfBoundsException f) {
-                System.out.println("deadline description and deadline not specified");
-                throw new UnexpectedCommandException();
-            }
-            System.out.println("deadline not specified");
-            throw new UnexpectedCommandException();
-        }
-        try {//deadline not specified
-            String description = line.substring(9, indexBy - 1);
-        } catch (IndexOutOfBoundsException e) {
-            System.out.println("deadline description not specified");
+        if (indexBy == -1) {
+            System.out.println("remember to include a description and a deadline!");
             throw new UnexpectedCommandException();
         }
+        String by = line.substring(indexBy + 3);
+        String description = line.substring(0, indexBy - 1);
         tasks[index] = new Deadline(description, by);
         System.out.println("Got it. I've added this task: ");
         System.out.println(tasks[index]);
@@ -72,7 +38,7 @@ public static void dealWithDeadline(Task[] tasks, int index, String line) throws
     public static void dealWithTodo(Task[] tasks, int index, String line) throws UnexpectedCommandException {
         int indexSpace = line.indexOf(" ");
         if (indexSpace == -1) {
-            System.out.println("todo description not specified");
+            System.out.println("todo description cannot be empty");
             throw new UnexpectedCommandException();
         }
 
@@ -95,7 +61,8 @@ private void handleEmptyInput(String line) throws EmptyLineException {
         }
     }
 
-    public ManageInputs(Task[] tasks, int index, String line) {
+    public ManageInputs(Task[] tasks, int index, String line){
+
         while (!line.equals("bye")) {
             Boolean isValidCommand = false;
             Scanner input = new Scanner(System.in);
@@ -150,7 +117,7 @@ public ManageInputs(Task[] tasks, int index, String line) {
                     handleUnexpectedCommand(isValidCommand);
                 } catch (UnexpectedCommandException e) {
                     System.out.println("please enter a valid command");
-                } catch (EmptyLineException e) {
+                } catch (EmptyLineException e){
                     System.out.println("enter a task");
                 }
             }
@@ -158,9 +125,3 @@ public ManageInputs(Task[] tasks, int index, String line) {
         System.out.println("Bye. Hope to see you again soon!");
     }
 }
-
-/*try{
-            handleFromUnspecified();
-        } catch (FromUnspecifiedError e){
-            System.out.println("remember to include start of event!");
-        }*/
\ No newline at end of file

From c43aef30e21d72dd3b09e696a9a7b88ddce1017a Mon Sep 17 00:00:00 2001
From: hongyijie06 <hongyijie06@gmail.com>
Date: Tue, 20 Feb 2024 14:28:49 +0800
Subject: [PATCH 11/28] Revert "Revert "make error handling more
 error-specific""

This reverts commit 4793c541ea1fe105390fec9bb05217c3159eddd1.
---
 src/main/java/ManageInputs.java | 67 ++++++++++++++++++++++++++-------
 1 file changed, 53 insertions(+), 14 deletions(-)

diff --git a/src/main/java/ManageInputs.java b/src/main/java/ManageInputs.java
index 02bbff9fa..1ad4fa861 100644
--- a/src/main/java/ManageInputs.java
+++ b/src/main/java/ManageInputs.java
@@ -3,19 +3,37 @@
 public class ManageInputs {
     protected static String from;
     protected static String to;
-    public String description;
+    public static String description;
+    protected static String by;
+
 
     public static void dealWithEvent(Task[] tasks, int index, String[] inputs, String line) throws UnexpectedCommandException {
         int indexTo = line.indexOf("/to");
         int indexFrom = line.indexOf("/from");
 
-        if ((indexTo == -1) || (indexFrom == -1)) {
-            System.out.println("remember to include a description and event timeline!");
+        if ((indexTo == -1) || (indexFrom == -1)) { //invalid format
+            System.out.println("Invalid format! Enter event in the format: event (description) /from (start) /to (end)");
+            throw new UnexpectedCommandException();
+        }
+        try {//timeline not specified/ both not specified
+            String from = line.substring(indexFrom + 6, indexTo - 1);
+            String to = line.substring(indexTo + 4);
+        } catch (IndexOutOfBoundsException e) {
+            try {
+                String description = line.substring(6, indexFrom - 1);
+            } catch (IndexOutOfBoundsException f) {
+                System.out.println("event description and timeline not specified");
+                throw new UnexpectedCommandException();
+            }
+            System.out.println("event timeline not specified");
+            throw new UnexpectedCommandException();
+        }
+        try {//description not specified
+            String description = line.substring(6, indexFrom - 1);
+        } catch (IndexOutOfBoundsException e) {
+            System.out.println("event description not specified");
             throw new UnexpectedCommandException();
         }
-        String from = line.substring(indexFrom + 6, indexTo - 1);
-        String to = line.substring(indexTo + 4);
-        String description = line.substring(6, indexFrom - 1);
 
         tasks[index] = new Event(description, from, to);
         System.out.println("Got it. I've added this task: ");
@@ -24,12 +42,28 @@ public static void dealWithEvent(Task[] tasks, int index, String[] inputs, Strin
 
     public static void dealWithDeadline(Task[] tasks, int index, String line) throws UnexpectedCommandException {
         int indexBy = line.indexOf("by");
-        if (indexBy == -1) {
-            System.out.println("remember to include a description and a deadline!");
+        if (indexBy == -1) {//invalid format
+            System.out.println("Invalid format! Enter deadline in the format: deadline (description) by (deadline)");
+            throw new UnexpectedCommandException();
+        }
+        try {//deadline / both not specified
+            String by = line.substring(indexBy + 3);
+        } catch (IndexOutOfBoundsException e) {
+            try {
+                String description = line.substring(9, indexBy - 1);
+            } catch (IndexOutOfBoundsException f) {
+                System.out.println("deadline description and deadline not specified");
+                throw new UnexpectedCommandException();
+            }
+            System.out.println("deadline not specified");
+            throw new UnexpectedCommandException();
+        }
+        try {//deadline not specified
+            String description = line.substring(9, indexBy - 1);
+        } catch (IndexOutOfBoundsException e) {
+            System.out.println("deadline description not specified");
             throw new UnexpectedCommandException();
         }
-        String by = line.substring(indexBy + 3);
-        String description = line.substring(0, indexBy - 1);
         tasks[index] = new Deadline(description, by);
         System.out.println("Got it. I've added this task: ");
         System.out.println(tasks[index]);
@@ -38,7 +72,7 @@ public static void dealWithDeadline(Task[] tasks, int index, String line) throws
     public static void dealWithTodo(Task[] tasks, int index, String line) throws UnexpectedCommandException {
         int indexSpace = line.indexOf(" ");
         if (indexSpace == -1) {
-            System.out.println("todo description cannot be empty");
+            System.out.println("todo description not specified");
             throw new UnexpectedCommandException();
         }
 
@@ -61,8 +95,7 @@ private void handleEmptyInput(String line) throws EmptyLineException {
         }
     }
 
-    public ManageInputs(Task[] tasks, int index, String line){
-
+    public ManageInputs(Task[] tasks, int index, String line) {
         while (!line.equals("bye")) {
             Boolean isValidCommand = false;
             Scanner input = new Scanner(System.in);
@@ -117,7 +150,7 @@ public ManageInputs(Task[] tasks, int index, String line){
                     handleUnexpectedCommand(isValidCommand);
                 } catch (UnexpectedCommandException e) {
                     System.out.println("please enter a valid command");
-                } catch (EmptyLineException e){
+                } catch (EmptyLineException e) {
                     System.out.println("enter a task");
                 }
             }
@@ -125,3 +158,9 @@ public ManageInputs(Task[] tasks, int index, String line){
         System.out.println("Bye. Hope to see you again soon!");
     }
 }
+
+/*try{
+            handleFromUnspecified();
+        } catch (FromUnspecifiedError e){
+            System.out.println("remember to include start of event!");
+        }*/
\ No newline at end of file

From e0bf4a2973deab651cd783f2fcea2ff5fdb1f753 Mon Sep 17 00:00:00 2001
From: hongyijie06 <hongyijie06@gmail.com>
Date: Tue, 20 Feb 2024 15:19:51 +0800
Subject: [PATCH 12/28] add delete

---
 src/main/java/Duke.java         |  4 ++-
 src/main/java/ManageInputs.java | 53 +++++++++++++++++++--------------
 2 files changed, 33 insertions(+), 24 deletions(-)

diff --git a/src/main/java/Duke.java b/src/main/java/Duke.java
index a09d411dc..85c754f07 100644
--- a/src/main/java/Duke.java
+++ b/src/main/java/Duke.java
@@ -1,10 +1,12 @@
+import java.sql.Array;
 import java.util.Scanner;
+import java.util.ArrayList;
 
 public class Duke {
 
 
     public static void main(String[] args) throws UnexpectedCommandException, EmptyLineException {
-        Task[] tasks = new Task[100];
+        ArrayList<Task> tasks = new ArrayList<Task>();
 
         //greeting
         System.out.println("Hello! I'm Apple");
diff --git a/src/main/java/ManageInputs.java b/src/main/java/ManageInputs.java
index 1ad4fa861..f8b00e7c9 100644
--- a/src/main/java/ManageInputs.java
+++ b/src/main/java/ManageInputs.java
@@ -1,5 +1,7 @@
+import java.util.ArrayList;
 import java.util.Scanner;
 
+
 public class ManageInputs {
     protected static String from;
     protected static String to;
@@ -7,7 +9,7 @@ public class ManageInputs {
     protected static String by;
 
 
-    public static void dealWithEvent(Task[] tasks, int index, String[] inputs, String line) throws UnexpectedCommandException {
+    public static void dealWithEvent(ArrayList<Task> tasks, int index, String[] inputs, String line) throws UnexpectedCommandException {
         int indexTo = line.indexOf("/to");
         int indexFrom = line.indexOf("/from");
 
@@ -34,13 +36,16 @@ public static void dealWithEvent(Task[] tasks, int index, String[] inputs, Strin
             System.out.println("event description not specified");
             throw new UnexpectedCommandException();
         }
+        String from = line.substring(indexFrom + 6, indexTo - 1);
+        String to = line.substring(indexTo + 4);
+        String description = line.substring(6, indexFrom - 1);
 
-        tasks[index] = new Event(description, from, to);
+        tasks.add(index, new Event(description, from, to));
         System.out.println("Got it. I've added this task: ");
-        System.out.println(tasks[index]);
+        System.out.println(tasks.get(index));
     }
 
-    public static void dealWithDeadline(Task[] tasks, int index, String line) throws UnexpectedCommandException {
+    public static void dealWithDeadline(ArrayList<Task> tasks, int index, String line) throws UnexpectedCommandException {
         int indexBy = line.indexOf("by");
         if (indexBy == -1) {//invalid format
             System.out.println("Invalid format! Enter deadline in the format: deadline (description) by (deadline)");
@@ -64,12 +69,14 @@ public static void dealWithDeadline(Task[] tasks, int index, String line) throws
             System.out.println("deadline description not specified");
             throw new UnexpectedCommandException();
         }
-        tasks[index] = new Deadline(description, by);
+        String description = line.substring(9, indexBy - 1);
+        String by = line.substring(indexBy + 3);
+        tasks.add(index, new Deadline(description, by));
         System.out.println("Got it. I've added this task: ");
-        System.out.println(tasks[index]);
+        System.out.println(tasks.get(index));
     }
 
-    public static void dealWithTodo(Task[] tasks, int index, String line) throws UnexpectedCommandException {
+    public static void dealWithTodo( ArrayList<Task> tasks, int index, String line) throws UnexpectedCommandException {
         int indexSpace = line.indexOf(" ");
         if (indexSpace == -1) {
             System.out.println("todo description not specified");
@@ -78,9 +85,9 @@ public static void dealWithTodo(Task[] tasks, int index, String line) throws Une
 
         String description = line.substring(indexSpace);
 
-        tasks[index] = new Todo(description);
+        tasks.add(index, new Todo(description));
         System.out.println("Got it. I've added this task: ");
-        System.out.println(tasks[index]);
+        System.out.println(tasks.get(index));
     }
 
     private void handleUnexpectedCommand(boolean isValidCommand) throws UnexpectedCommandException {
@@ -95,7 +102,7 @@ private void handleEmptyInput(String line) throws EmptyLineException {
         }
     }
 
-    public ManageInputs(Task[] tasks, int index, String line) {
+    public ManageInputs(ArrayList<Task> tasks, int index, String line) {
         while (!line.equals("bye")) {
             Boolean isValidCommand = false;
             Scanner input = new Scanner(System.in);
@@ -107,20 +114,20 @@ public ManageInputs(Task[] tasks, int index, String line) {
             if (inputs[0].equals("mark")) {//mark as done
                 isValidCommand = true;
                 int idx = Integer.parseInt(inputs[1]);
-                tasks[idx - 1].markAsDone();
+                tasks.get(idx - 1).markAsDone();
                 System.out.println("Nice! I've marked this task as done: ");
-                System.out.println("[" + tasks[idx - 1].getStatusIcon() + "]" + tasks[idx - 1].description);
+                System.out.println(tasks.get(idx-1));
             } else if (inputs[0].equals("unmark")) {//unmark done
                 isValidCommand = true;
                 int idx = Integer.parseInt(inputs[1]);
-                tasks[idx - 1].unmarkDone();
+                tasks.get(idx - 1).unmarkDone();
                 System.out.println("OK, I've marked this task as not done yet: ");
-                System.out.println("[" + tasks[idx - 1].getStatusIcon() + "]" + tasks[idx - 1].description);
+                System.out.println(tasks.get(idx-1));
             } else if (line.equals("list")) {//lists tasks
                 isValidCommand = true;
                 System.out.println("Here are the tasks in your list: ");
                 for (int i = 0; i < index; i++) {
-                    System.out.println((i + 1) + ". " + tasks[i]);
+                    System.out.println((i + 1) + ". " + tasks.get(i));
                 }
             } else if (line.equals("bye")) {//exit chat
                 isValidCommand = true;
@@ -140,10 +147,16 @@ public ManageInputs(Task[] tasks, int index, String line) {
                         dealWithTodo(tasks, index, line);
                         index++;
                     }
-                    System.out.println("Now you have " + index + " tasks in the list.");
                 } catch (UnexpectedCommandException e) {
-
                 }
+                System.out.println("Now you have " + tasks.size() + " tasks in the list.");
+            } else if (inputs[0].equals("delete")){
+                int idx = Integer.parseInt(inputs[1]);
+                System.out.println("Noted. I've removed this task: ");
+                System.out.println(tasks.get(idx-1));
+                tasks.remove(idx - 1);
+                System.out.println("Now you have " + tasks.size() + " tasks in the list.");
+                index--;
             } else {
                 try {
                     handleEmptyInput(line);
@@ -158,9 +171,3 @@ public ManageInputs(Task[] tasks, int index, String line) {
         System.out.println("Bye. Hope to see you again soon!");
     }
 }
-
-/*try{
-            handleFromUnspecified();
-        } catch (FromUnspecifiedError e){
-            System.out.println("remember to include start of event!");
-        }*/
\ No newline at end of file

From 4de283c67fe75cd366b03d4592d29469dc621a10 Mon Sep 17 00:00:00 2001
From: hongyijie06 <hongyijie06@gmail.com>
Date: Thu, 22 Feb 2024 17:13:22 +0800
Subject: [PATCH 13/28] settle errors

---
 production/main/Deadline.class                   | Bin 0 -> 979 bytes
 production/main/Duke.class                       | Bin 0 -> 969 bytes
 production/main/EmptyLineException.class         | Bin 0 -> 282 bytes
 production/main/Event.class                      | Bin 0 -> 1062 bytes
 production/main/ManageInputs.class               | Bin 0 -> 6396 bytes
 production/main/Task.class                       | Bin 0 -> 1269 bytes
 production/main/Todo.class                       | Bin 0 -> 853 bytes
 production/main/UnexpectedCommandException.class | Bin 0 -> 306 bytes
 src/.idea/.gitignore                             |   8 ++++++++
 src/.idea/.name                                  |   1 +
 src/.idea/misc.xml                               |   6 ++++++
 src/.idea/modules.xml                            |   8 ++++++++
 src/.idea/vcs.xml                                |   6 ++++++
 src/out/production/ip/Deadline.class             | Bin 0 -> 979 bytes
 src/out/production/ip/Duke.class                 | Bin 0 -> 973 bytes
 src/out/production/ip/EmptyLineException.class   | Bin 0 -> 282 bytes
 src/out/production/ip/Event.class                | Bin 0 -> 1062 bytes
 src/out/production/ip/ManageInputs.class         | Bin 0 -> 6396 bytes
 src/out/production/ip/Task.class                 | Bin 0 -> 1269 bytes
 src/out/production/ip/Todo.class                 | Bin 0 -> 853 bytes
 .../ip/UnexpectedCommandException.class          | Bin 0 -> 306 bytes
 21 files changed, 29 insertions(+)
 create mode 100644 production/main/Deadline.class
 create mode 100644 production/main/Duke.class
 create mode 100644 production/main/EmptyLineException.class
 create mode 100644 production/main/Event.class
 create mode 100644 production/main/ManageInputs.class
 create mode 100644 production/main/Task.class
 create mode 100644 production/main/Todo.class
 create mode 100644 production/main/UnexpectedCommandException.class
 create mode 100644 src/.idea/.gitignore
 create mode 100644 src/.idea/.name
 create mode 100644 src/.idea/misc.xml
 create mode 100644 src/.idea/modules.xml
 create mode 100644 src/.idea/vcs.xml
 create mode 100644 src/out/production/ip/Deadline.class
 create mode 100644 src/out/production/ip/Duke.class
 create mode 100644 src/out/production/ip/EmptyLineException.class
 create mode 100644 src/out/production/ip/Event.class
 create mode 100644 src/out/production/ip/ManageInputs.class
 create mode 100644 src/out/production/ip/Task.class
 create mode 100644 src/out/production/ip/Todo.class
 create mode 100644 src/out/production/ip/UnexpectedCommandException.class

diff --git a/production/main/Deadline.class b/production/main/Deadline.class
new file mode 100644
index 0000000000000000000000000000000000000000..a306b63f8fa980cc78210f9ba3e56dbf13cd91d4
GIT binary patch
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literal 0
HcmV?d00001

diff --git a/production/main/Duke.class b/production/main/Duke.class
new file mode 100644
index 0000000000000000000000000000000000000000..935fed7f2e9a7b72c32b5517eddff9771252d311
GIT binary patch
literal 969
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literal 0
HcmV?d00001

diff --git a/production/main/EmptyLineException.class b/production/main/EmptyLineException.class
new file mode 100644
index 0000000000000000000000000000000000000000..c25befa72b29be5f22c51773c10e62581baf9dd6
GIT binary patch
literal 282
zcmZXOy^6v>6ot=?`Oz4Ss9<g9T9|SR#YVIWHj4cu4muJO$wqM>Yb(KGAHauN_D&ER
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literal 0
HcmV?d00001

diff --git a/production/main/Event.class b/production/main/Event.class
new file mode 100644
index 0000000000000000000000000000000000000000..6c21ce09f9b190c967a8d5cb3985cc7e04eb2cf3
GIT binary patch
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HcmV?d00001

diff --git a/production/main/ManageInputs.class b/production/main/ManageInputs.class
new file mode 100644
index 0000000000000000000000000000000000000000..3e38f8aa6da2f190899aeab88685856463c9fe05
GIT binary patch
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diff --git a/production/main/Task.class b/production/main/Task.class
new file mode 100644
index 0000000000000000000000000000000000000000..3a2f54fde81b89f064efd45733797acc57f24892
GIT binary patch
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diff --git a/production/main/Todo.class b/production/main/Todo.class
new file mode 100644
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GIT binary patch
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literal 0
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diff --git a/production/main/UnexpectedCommandException.class b/production/main/UnexpectedCommandException.class
new file mode 100644
index 0000000000000000000000000000000000000000..6c0d54dfee7340a2a50b2c5d8b341ff75f628cf2
GIT binary patch
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diff --git a/src/.idea/.gitignore b/src/.idea/.gitignore
new file mode 100644
index 000000000..13566b81b
--- /dev/null
+++ b/src/.idea/.gitignore
@@ -0,0 +1,8 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml
diff --git a/src/.idea/.name b/src/.idea/.name
new file mode 100644
index 000000000..305fff84b
--- /dev/null
+++ b/src/.idea/.name
@@ -0,0 +1 @@
+Task.class
\ No newline at end of file
diff --git a/src/.idea/misc.xml b/src/.idea/misc.xml
new file mode 100644
index 000000000..e0844bc7b
--- /dev/null
+++ b/src/.idea/misc.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_11" default="true" project-jdk-name="11" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/src/.idea/modules.xml b/src/.idea/modules.xml
new file mode 100644
index 000000000..b8cce4602
--- /dev/null
+++ b/src/.idea/modules.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/ip.iml" filepath="$PROJECT_DIR$/ip.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file
diff --git a/src/.idea/vcs.xml b/src/.idea/vcs.xml
new file mode 100644
index 000000000..6c0b86358
--- /dev/null
+++ b/src/.idea/vcs.xml
@@ -0,0 +1,6 @@
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+  <component name="VcsDirectoryMappings">
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+  </component>
+</project>
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diff --git a/src/out/production/ip/Deadline.class b/src/out/production/ip/Deadline.class
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diff --git a/src/out/production/ip/Duke.class b/src/out/production/ip/Duke.class
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diff --git a/src/out/production/ip/EmptyLineException.class b/src/out/production/ip/EmptyLineException.class
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diff --git a/src/out/production/ip/Event.class b/src/out/production/ip/Event.class
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diff --git a/src/out/production/ip/ManageInputs.class b/src/out/production/ip/ManageInputs.class
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diff --git a/src/out/production/ip/Task.class b/src/out/production/ip/Task.class
new file mode 100644
index 0000000000000000000000000000000000000000..3a2f54fde81b89f064efd45733797acc57f24892
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diff --git a/src/out/production/ip/Todo.class b/src/out/production/ip/Todo.class
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diff --git a/src/out/production/ip/UnexpectedCommandException.class b/src/out/production/ip/UnexpectedCommandException.class
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From e44d14ee743a002b01d0fc8c76e941b0ad946c46 Mon Sep 17 00:00:00 2001
From: hongyijie06 <hongyijie06@gmail.com>
Date: Fri, 23 Feb 2024 02:27:48 +0800
Subject: [PATCH 14/28] add save

---
 src/main/java/CreateFile.java       | 2 ++
 src/main/java/ReadFileContents.java | 2 ++
 2 files changed, 4 insertions(+)
 create mode 100644 src/main/java/CreateFile.java
 create mode 100644 src/main/java/ReadFileContents.java

diff --git a/src/main/java/CreateFile.java b/src/main/java/CreateFile.java
new file mode 100644
index 000000000..895711ff5
--- /dev/null
+++ b/src/main/java/CreateFile.java
@@ -0,0 +1,2 @@
+package PACKAGE_NAME;public class CreateFile {
+}
diff --git a/src/main/java/ReadFileContents.java b/src/main/java/ReadFileContents.java
new file mode 100644
index 000000000..f5f39b9d8
--- /dev/null
+++ b/src/main/java/ReadFileContents.java
@@ -0,0 +1,2 @@
+package PACKAGE_NAME;public class ReadFileContents {
+}

From 011c695f9f3c86b23caa4d00802262bb1895062a Mon Sep 17 00:00:00 2001
From: hongyijie06 <hongyijie06@gmail.com>
Date: Fri, 23 Feb 2024 02:31:14 +0800
Subject: [PATCH 15/28] resolve errors

---
 production/main/CreateFile.class       | Bin 0 -> 1498 bytes
 production/main/Duke.class             | Bin 969 -> 2188 bytes
 production/main/ManageInputs.class     | Bin 6396 -> 7530 bytes
 production/main/ReadFileContents.class | Bin 0 -> 1178 bytes
 production/main/Task.class             | Bin 1269 -> 1269 bytes
 src/TaskList.txt                       |  16 +++++
 src/main/java/CreateFile.java          |  22 +++++-
 src/main/java/Duke.java                |  20 +++++-
 src/main/java/ManageInputs.java        |  96 +++++++++++++++++--------
 src/main/java/ReadFileContents.java    |  27 ++++++-
 src/main/java/Task.java                |   2 +-
 11 files changed, 148 insertions(+), 35 deletions(-)
 create mode 100644 production/main/CreateFile.class
 create mode 100644 production/main/ReadFileContents.class
 create mode 100644 src/TaskList.txt

diff --git a/production/main/CreateFile.class b/production/main/CreateFile.class
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diff --git a/production/main/Duke.class b/production/main/Duke.class
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diff --git a/production/main/ManageInputs.class b/production/main/ManageInputs.class
index 3e38f8aa6da2f190899aeab88685856463c9fe05..ba19acc4b42a395b4b1ba140abfe69d1213fc6df 100644
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z#2d8zQkJwj@jR{H%nmzKJmcI56q%dZq~=K89C%;gNZuS+kT`Ph3%Ty^oNCL|nRbjk
zLJ@ui(M-7qzrt;({R;{%Q!qtAwJaz22=fl3j8<#D5fdkjE1It`@*_UNqNN-(E2uca
rdNF{VFLO~yu&8~Jknk~J@`@0G5PqSG0Nd(*&WpHnfNFi$dH(RftA#b*

diff --git a/production/main/ReadFileContents.class b/production/main/ReadFileContents.class
new file mode 100644
index 0000000000000000000000000000000000000000..acca04e15829034df832c68fd394f0eebc1fa239
GIT binary patch
literal 1178
zcmZuw*-{fh6g{0xm}D3r3kecMa3w4fcT^CU2>K9^G87j2)Pw;Bk{K%LD1L$8;1}?W
z4`4}^AK=gU1umzPKm}r@()adV&OP_`ou7Zc{{S$Fmlk3eGcj%<fEy+zEEve@<7Nc6
za9eA4EZoJtFz#E3V$#F|6AvwPVJwVCCZ<eG3v^7oo~vdAf|-$J0VC(HIRZU-*K-zX
z<yEJ$Bv(tc#PfbpmX>A3)%T{+P@8U5``$QmZO$z@Ip0%`r>au|v7L(RsaB&vGLzqu
zA7r*9y^U-^F<@g#R}HT-cTuWMjnx(*Al3!C8xGgcYD^Xotej{VYsxKU3q|R9PKBPX
zf|AAUdAZZ1Y0d5yogL-+9#f36bUlGo=6!o5%|)=;!Be#sd^P9SytNY)mM~;xL)ZTg
zh=5h_Yn7s-d9vrTvzgEh+K3||VAq>%_M~lT4z6x%ZAm*G+nB)<6HjeC!*d%syf86q
zV@{{oOR~D1cdKeb?J67n+BVP%-PQt0<|>X<O_JT3>yYQGp>^G<K=dqYn(Bb{r+dA+
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fDI!KV%WLGTbJG|`hEj7Pn^z|6C><lb1~B>$A|Cp`

literal 0
HcmV?d00001

diff --git a/production/main/Task.class b/production/main/Task.class
index 3a2f54fde81b89f064efd45733797acc57f24892..668ea5de9cc3c1d21e105be94975fc6c0b04aa76 100644
GIT binary patch
delta 18
Zcmey$`IU2nA0w+FBLkzs=3vG}%m6sV1rPuL

delta 18
Zcmey$`IU2nA0ul7BLkzt=3vG}%m6v+1t$Oi

diff --git a/src/TaskList.txt b/src/TaskList.txt
new file mode 100644
index 000000000..74091fd17
--- /dev/null
+++ b/src/TaskList.txt
@@ -0,0 +1,16 @@
+[T][0] hike
+[T][0] run
+[D][0] tut (by:  5)
+[E][0] he (from: 5 to: 6)
+[T][0] jump
+[T][0] go
+[D][0] hop (by:  4)
+[E][0] he (from: 4 to:  5)
+[D][0] b (by:  4)
+[E][0] go (from: 4 to:  454)
+[T][0] ds
+[D][0] kj (by:  4)
+[T][0] he
+[E][0] f (from: 4 to:  5)
+[D][0] sd (by:  5)
+[D][0] hsd (by:  343354535)
diff --git a/src/main/java/CreateFile.java b/src/main/java/CreateFile.java
index 895711ff5..32ac2b64e 100644
--- a/src/main/java/CreateFile.java
+++ b/src/main/java/CreateFile.java
@@ -1,2 +1,22 @@
-package PACKAGE_NAME;public class CreateFile {
+import java.io.File;
+import java.io.IOException;
+
+public class CreateFile {
+    public static void main(String[] args) {
+        File f = new File("TaskList.txt");
+        if (!f.exists()) {
+            try {
+                if (f.createNewFile()) {
+                    System.out.println("File created: " + f.getAbsolutePath());
+                } else {
+                    System.out.println("File creation failed.");
+                }
+            } catch (IOException e) {
+                System.out.println("An error occurred.");
+                e.printStackTrace();
+            }
+        } else {
+            System.out.println("File already exists: " + f.getAbsolutePath());
+        }
+    }
 }
diff --git a/src/main/java/Duke.java b/src/main/java/Duke.java
index 85c754f07..770e0ea1c 100644
--- a/src/main/java/Duke.java
+++ b/src/main/java/Duke.java
@@ -1,17 +1,35 @@
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
 import java.sql.Array;
 import java.util.Scanner;
 import java.util.ArrayList;
 
 public class Duke {
 
+    private static void printFileContents(String filePath) throws FileNotFoundException {
+        File f = new File(filePath); // create a File for the given file path
+        Scanner s = new Scanner(f); // create a Scanner using the File as the source
+        while (s.hasNext()) {
+            System.out.println(s.nextLine());
+        }
+    }
 
-    public static void main(String[] args) throws UnexpectedCommandException, EmptyLineException {
+    public static void main(String[] args) throws UnexpectedCommandException, EmptyLineException, IOException {
         ArrayList<Task> tasks = new ArrayList<Task>();
 
         //greeting
         System.out.println("Hello! I'm Apple");
         System.out.println("What can I do for you?");
+        try {
+            System.out.println("Here are the items in your task list: ");
+            printFileContents("TaskList.txt");
 
+        } catch (FileNotFoundException e) {
+            File f = new File("TaskList.txt");
+            System.out.println("File not found");
+            System.out.println("File created: " + f.getAbsolutePath());
+        }
         int index = 0;//number of items in the list
         String line = " ";
 
diff --git a/src/main/java/ManageInputs.java b/src/main/java/ManageInputs.java
index f8b00e7c9..58c280686 100644
--- a/src/main/java/ManageInputs.java
+++ b/src/main/java/ManageInputs.java
@@ -1,25 +1,50 @@
+import java.io.File;
+import java.io.FileWriter;
+import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Scanner;
 
-
 public class ManageInputs {
     protected static String from;
     protected static String to;
     public static String description;
     protected static String by;
 
+    private static void writeToFile(String filePath, Task textToAdd) throws IOException {
+        FileWriter fw = new FileWriter(filePath, true);
+        fw.write(textToAdd + "\n");
+        fw.close();
+    }
+
+    private static int fillFileContents(ArrayList<Task> tasks, String filePath, int index) throws IOException, UnexpectedCommandException {//updates index
+        File f = new File(filePath); // create a File for the given file path
+        Scanner s = new Scanner(f); // create a Scanner using the File as the source
+
+        while (s.hasNext()) {
+            String sLine = s.nextLine();
+            if (sLine.contains("[E]")) {
+                dealWithEvent(tasks, index, sLine);
+            } else if (sLine.contains("[D]")) {
+                dealWithDeadline(tasks, index, sLine);
+            } else if (sLine.contains("[T]")) {
+                dealWithTodo(tasks, index, sLine);
+            }
+            index++;
+        }
+        return index;
+    }
 
-    public static void dealWithEvent(ArrayList<Task> tasks, int index, String[] inputs, String line) throws UnexpectedCommandException {
-        int indexTo = line.indexOf("/to");
-        int indexFrom = line.indexOf("/from");
+    public static void dealWithEvent(ArrayList<Task> tasks, int index, String line) throws UnexpectedCommandException, IOException {
+        int indexTo = line.indexOf("to");
+        int indexFrom = line.indexOf("from");
 
         if ((indexTo == -1) || (indexFrom == -1)) { //invalid format
-            System.out.println("Invalid format! Enter event in the format: event (description) /from (start) /to (end)");
+            System.out.println("Invalid format! Enter event in the format: event (description) from (start) to (end)");
             throw new UnexpectedCommandException();
         }
         try {//timeline not specified/ both not specified
-            String from = line.substring(indexFrom + 6, indexTo - 1);
-            String to = line.substring(indexTo + 4);
+            String from = line.substring(indexFrom + 5, indexTo - 1);
+            String to = line.substring(indexTo + 2);
         } catch (IndexOutOfBoundsException e) {
             try {
                 String description = line.substring(6, indexFrom - 1);
@@ -36,26 +61,25 @@ public static void dealWithEvent(ArrayList<Task> tasks, int index, String[] inpu
             System.out.println("event description not specified");
             throw new UnexpectedCommandException();
         }
-        String from = line.substring(indexFrom + 6, indexTo - 1);
-        String to = line.substring(indexTo + 4);
-        String description = line.substring(6, indexFrom - 1);
+        String from = line.substring(indexFrom + 5, indexTo - 1);
+        String to = line.substring(indexTo + 2);
+        String description = line.substring(5, indexFrom - 1);
 
         tasks.add(index, new Event(description, from, to));
-        System.out.println("Got it. I've added this task: ");
-        System.out.println(tasks.get(index));
     }
 
-    public static void dealWithDeadline(ArrayList<Task> tasks, int index, String line) throws UnexpectedCommandException {
+    public static void dealWithDeadline(ArrayList<Task> tasks, int index, String line) throws UnexpectedCommandException, IOException {
         int indexBy = line.indexOf("by");
+        int space = line.indexOf(" ");
         if (indexBy == -1) {//invalid format
             System.out.println("Invalid format! Enter deadline in the format: deadline (description) by (deadline)");
             throw new UnexpectedCommandException();
         }
         try {//deadline / both not specified
-            String by = line.substring(indexBy + 3);
+            String by = line.substring(indexBy + 2);
         } catch (IndexOutOfBoundsException e) {
             try {
-                String description = line.substring(9, indexBy - 1);
+                String description = line.substring(space, indexBy - 1);
             } catch (IndexOutOfBoundsException f) {
                 System.out.println("deadline description and deadline not specified");
                 throw new UnexpectedCommandException();
@@ -64,19 +88,18 @@ public static void dealWithDeadline(ArrayList<Task> tasks, int index, String lin
             throw new UnexpectedCommandException();
         }
         try {//deadline not specified
-            String description = line.substring(9, indexBy - 1);
+            String description = line.substring(space, indexBy - 1);
         } catch (IndexOutOfBoundsException e) {
             System.out.println("deadline description not specified");
             throw new UnexpectedCommandException();
         }
-        String description = line.substring(9, indexBy - 1);
-        String by = line.substring(indexBy + 3);
+        String description = line.substring(space, indexBy - 1);
+        String by = line.substring(indexBy + 2);
+
         tasks.add(index, new Deadline(description, by));
-        System.out.println("Got it. I've added this task: ");
-        System.out.println(tasks.get(index));
     }
 
-    public static void dealWithTodo( ArrayList<Task> tasks, int index, String line) throws UnexpectedCommandException {
+    public static void dealWithTodo(ArrayList<Task> tasks, int index, String line) throws UnexpectedCommandException, IOException {
         int indexSpace = line.indexOf(" ");
         if (indexSpace == -1) {
             System.out.println("todo description not specified");
@@ -86,8 +109,7 @@ public static void dealWithTodo( ArrayList<Task> tasks, int index, String line)
         String description = line.substring(indexSpace);
 
         tasks.add(index, new Todo(description));
-        System.out.println("Got it. I've added this task: ");
-        System.out.println(tasks.get(index));
+
     }
 
     private void handleUnexpectedCommand(boolean isValidCommand) throws UnexpectedCommandException {
@@ -102,7 +124,8 @@ private void handleEmptyInput(String line) throws EmptyLineException {
         }
     }
 
-    public ManageInputs(ArrayList<Task> tasks, int index, String line) {
+    public ManageInputs(ArrayList<Task> tasks, int index, String line) throws IOException, UnexpectedCommandException {
+        index = fillFileContents(tasks, "TaskList.txt", index);
         while (!line.equals("bye")) {
             Boolean isValidCommand = false;
             Scanner input = new Scanner(System.in);
@@ -110,22 +133,23 @@ public ManageInputs(ArrayList<Task> tasks, int index, String line) {
 
             Task t = new Task(line);
             String[] inputs = line.split(" ");
-
+            
             if (inputs[0].equals("mark")) {//mark as done
                 isValidCommand = true;
                 int idx = Integer.parseInt(inputs[1]);
                 tasks.get(idx - 1).markAsDone();
                 System.out.println("Nice! I've marked this task as done: ");
-                System.out.println(tasks.get(idx-1));
+                System.out.println(tasks.get(idx - 1));
             } else if (inputs[0].equals("unmark")) {//unmark done
                 isValidCommand = true;
                 int idx = Integer.parseInt(inputs[1]);
                 tasks.get(idx - 1).unmarkDone();
                 System.out.println("OK, I've marked this task as not done yet: ");
-                System.out.println(tasks.get(idx-1));
+                System.out.println(tasks.get(idx - 1));
             } else if (line.equals("list")) {//lists tasks
                 isValidCommand = true;
                 System.out.println("Here are the tasks in your list: ");
+
                 for (int i = 0; i < index; i++) {
                     System.out.println((i + 1) + ". " + tasks.get(i));
                 }
@@ -136,24 +160,36 @@ public ManageInputs(ArrayList<Task> tasks, int index, String line) {
                 try {
                     if (inputs[0].equals("event")) {
                         isValidCommand = true;
-                        dealWithEvent(tasks, index, inputs, line);
+                        dealWithEvent(tasks, index, line);
+                        writeToFile("TaskList.txt", tasks.get(index));
+                        System.out.println("Got it. I've added this task: ");
+                        System.out.println(tasks.get(index));
                         index++;
                     } else if (inputs[0].equals("deadline")) {
                         isValidCommand = true;
                         dealWithDeadline(tasks, index, line);
+                        writeToFile("TaskList.txt", tasks.get(index));
+                        System.out.println("Got it. I've added this task: ");
+                        System.out.println(tasks.get(index));
                         index++;
                     } else {
                         isValidCommand = true;
                         dealWithTodo(tasks, index, line);
+                        writeToFile("TaskList.txt", tasks.get(index));
+                        System.out.println("Got it. I've added this task: ");
+                        System.out.println(tasks.get(index));
                         index++;
                     }
                 } catch (UnexpectedCommandException e) {
+                } catch (IOException e) {
+                    throw new RuntimeException(e);
                 }
                 System.out.println("Now you have " + tasks.size() + " tasks in the list.");
-            } else if (inputs[0].equals("delete")){
+            } else if (inputs[0].equals("delete")) {
+                isValidCommand = true;
                 int idx = Integer.parseInt(inputs[1]);
                 System.out.println("Noted. I've removed this task: ");
-                System.out.println(tasks.get(idx-1));
+                System.out.println(tasks.get(idx - 1));
                 tasks.remove(idx - 1);
                 System.out.println("Now you have " + tasks.size() + " tasks in the list.");
                 index--;
diff --git a/src/main/java/ReadFileContents.java b/src/main/java/ReadFileContents.java
index f5f39b9d8..9f914cc71 100644
--- a/src/main/java/ReadFileContents.java
+++ b/src/main/java/ReadFileContents.java
@@ -1,2 +1,25 @@
-package PACKAGE_NAME;public class ReadFileContents {
-}
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.util.Scanner;
+
+public class ReadFileContents {
+
+    private static void printFileContents(String filePath) throws FileNotFoundException {
+        File f = new File(filePath); // create a File for the given file path
+        Scanner s = new Scanner(f); // create a Scanner using the File as the source
+        while (s.hasNext()) {
+            System.out.println(s.nextLine());
+        }
+    }
+
+    public static void main(String[] args) {
+        try {
+            printFileContents("TaskList.txt");
+
+        } catch (FileNotFoundException e) {
+            new CreateFile();
+            System.out.println("File not found");
+        }
+    }
+
+}
\ No newline at end of file
diff --git a/src/main/java/Task.java b/src/main/java/Task.java
index 87b80a79e..43f4b8705 100644
--- a/src/main/java/Task.java
+++ b/src/main/java/Task.java
@@ -7,7 +7,7 @@ public Task(String description) {
     }
 
     public String getStatusIcon() {
-        return (isDone ? "X" : " "); // mark done task with X
+        return (isDone ? "1" : "0"); // mark done task with X
     }
 
     public void markAsDone() {

From b1fd82dd74ba227a2a9e43ddc187b8c067735cc4 Mon Sep 17 00:00:00 2001
From: hongyijie06 <hongyijie06@gmail.com>
Date: Sat, 2 Mar 2024 12:04:09 +0800
Subject: [PATCH 16/28] fix formatting when listing tasks

---
 src/main/java/ManageInputs.java | 80 ++++++++++++++++++++++-----------
 1 file changed, 55 insertions(+), 25 deletions(-)

diff --git a/src/main/java/ManageInputs.java b/src/main/java/ManageInputs.java
index 58c280686..587f0af4c 100644
--- a/src/main/java/ManageInputs.java
+++ b/src/main/java/ManageInputs.java
@@ -16,38 +16,47 @@ private static void writeToFile(String filePath, Task textToAdd) throws IOExcept
         fw.close();
     }
 
-    private static int fillFileContents(ArrayList<Task> tasks, String filePath, int index) throws IOException, UnexpectedCommandException {//updates index
+
+
+    private static int fillFileContents(ArrayList<Task> tasks, String filePath, int index, boolean isInTxt) throws IOException, UnexpectedCommandException {//updates index
         File f = new File(filePath); // create a File for the given file path
         Scanner s = new Scanner(f); // create a Scanner using the File as the source
 
         while (s.hasNext()) {
+
             String sLine = s.nextLine();
             if (sLine.contains("[E]")) {
-                dealWithEvent(tasks, index, sLine);
+                dealWithEvent(tasks, index, sLine, true);
             } else if (sLine.contains("[D]")) {
-                dealWithDeadline(tasks, index, sLine);
+                dealWithDeadline(tasks, index, sLine, true);
             } else if (sLine.contains("[T]")) {
-                dealWithTodo(tasks, index, sLine);
+                dealWithTodo(tasks, index, sLine, true);
             }
             index++;
         }
+        isInTxt = false;
         return index;
     }
 
-    public static void dealWithEvent(ArrayList<Task> tasks, int index, String line) throws UnexpectedCommandException, IOException {
-        int indexTo = line.indexOf("to");
+
+
+    public static void dealWithEvent(ArrayList<Task> tasks, int index, String line, boolean isInTxt) throws UnexpectedCommandException, IOException {
+        int indexTo = line.lastIndexOf("to");
         int indexFrom = line.indexOf("from");
+        String from;
+        String to;
+        String description;
 
         if ((indexTo == -1) || (indexFrom == -1)) { //invalid format
             System.out.println("Invalid format! Enter event in the format: event (description) from (start) to (end)");
             throw new UnexpectedCommandException();
         }
         try {//timeline not specified/ both not specified
-            String from = line.substring(indexFrom + 5, indexTo - 1);
-            String to = line.substring(indexTo + 2);
+            from = line.substring(indexFrom + 5, indexTo - 1);
+            to = line.substring(indexTo + 2);
         } catch (IndexOutOfBoundsException e) {
             try {
-                String description = line.substring(6, indexFrom - 1);
+                description = line.substring(5, indexFrom - 1);
             } catch (IndexOutOfBoundsException f) {
                 System.out.println("event description and timeline not specified");
                 throw new UnexpectedCommandException();
@@ -56,30 +65,40 @@ public static void dealWithEvent(ArrayList<Task> tasks, int index, String line)
             throw new UnexpectedCommandException();
         }
         try {//description not specified
-            String description = line.substring(6, indexFrom - 1);
+            description = line.substring(5, indexFrom - 1);
         } catch (IndexOutOfBoundsException e) {
             System.out.println("event description not specified");
             throw new UnexpectedCommandException();
         }
-        String from = line.substring(indexFrom + 5, indexTo - 1);
-        String to = line.substring(indexTo + 2);
-        String description = line.substring(5, indexFrom - 1);
+        if(!isInTxt) {
+            from = line.substring(indexFrom + 5, indexTo - 1);
+            to = line.substring(indexTo + 3);
+            description = line.substring(5, indexFrom - 1);
+        } else {
+            from = line.substring(indexFrom + 6, indexTo - 1);
+            to = line.substring(indexTo + 4, line.length() - 1);
+            description = line.substring(5, indexFrom - 1);
+        } //when uncomment this, cannot add but reads file contents properly
+        //when commented, can add but cannot read file contents properly
+        //System.out.println(isInTxt);
 
         tasks.add(index, new Event(description, from, to));
     }
 
-    public static void dealWithDeadline(ArrayList<Task> tasks, int index, String line) throws UnexpectedCommandException, IOException {
+    public static void dealWithDeadline(ArrayList<Task> tasks, int index, String line, boolean isInTxt) throws UnexpectedCommandException, IOException {
         int indexBy = line.indexOf("by");
         int space = line.indexOf(" ");
+        String by;
+        String description;
         if (indexBy == -1) {//invalid format
             System.out.println("Invalid format! Enter deadline in the format: deadline (description) by (deadline)");
             throw new UnexpectedCommandException();
         }
         try {//deadline / both not specified
-            String by = line.substring(indexBy + 2);
+            by = line.substring(indexBy + 2);
         } catch (IndexOutOfBoundsException e) {
             try {
-                String description = line.substring(space, indexBy - 1);
+                description = line.substring(space, indexBy - 1);
             } catch (IndexOutOfBoundsException f) {
                 System.out.println("deadline description and deadline not specified");
                 throw new UnexpectedCommandException();
@@ -88,18 +107,23 @@ public static void dealWithDeadline(ArrayList<Task> tasks, int index, String lin
             throw new UnexpectedCommandException();
         }
         try {//deadline not specified
-            String description = line.substring(space, indexBy - 1);
+            description = line.substring(space, indexBy - 1);
         } catch (IndexOutOfBoundsException e) {
             System.out.println("deadline description not specified");
             throw new UnexpectedCommandException();
         }
-        String description = line.substring(space, indexBy - 1);
-        String by = line.substring(indexBy + 2);
+        if (!isInTxt) {
+            description = line.substring(space, indexBy - 1);
+            by = line.substring(indexBy + 3);
+        } else{
+            description = line.substring(space, indexBy - 1);
+            by = line.substring(indexBy + 4, line.length() - 1);
+        }
 
         tasks.add(index, new Deadline(description, by));
     }
 
-    public static void dealWithTodo(ArrayList<Task> tasks, int index, String line) throws UnexpectedCommandException, IOException {
+    public static void dealWithTodo(ArrayList<Task> tasks, int index, String line, boolean isInTxt) throws UnexpectedCommandException, IOException {
         int indexSpace = line.indexOf(" ");
         if (indexSpace == -1) {
             System.out.println("todo description not specified");
@@ -125,7 +149,9 @@ private void handleEmptyInput(String line) throws EmptyLineException {
     }
 
     public ManageInputs(ArrayList<Task> tasks, int index, String line) throws IOException, UnexpectedCommandException {
-        index = fillFileContents(tasks, "TaskList.txt", index);
+        boolean isInTxt = false;
+        index = fillFileContents(tasks, "TaskList.txt", index, isInTxt);
+
         while (!line.equals("bye")) {
             Boolean isValidCommand = false;
             Scanner input = new Scanner(System.in);
@@ -155,26 +181,30 @@ public ManageInputs(ArrayList<Task> tasks, int index, String line) throws IOExce
                 }
             } else if (line.equals("bye")) {//exit chat
                 isValidCommand = true;
+
+
+
+
                 break;
             } else if (inputs[0].equals("event") || inputs[0].equals("todo") || inputs[0].equals("deadline")) {//add items
                 try {
                     if (inputs[0].equals("event")) {
                         isValidCommand = true;
-                        dealWithEvent(tasks, index, line);
+                        dealWithEvent(tasks, index, line, isInTxt);
                         writeToFile("TaskList.txt", tasks.get(index));
                         System.out.println("Got it. I've added this task: ");
                         System.out.println(tasks.get(index));
                         index++;
                     } else if (inputs[0].equals("deadline")) {
                         isValidCommand = true;
-                        dealWithDeadline(tasks, index, line);
+                        dealWithDeadline(tasks, index, line, isInTxt);
                         writeToFile("TaskList.txt", tasks.get(index));
                         System.out.println("Got it. I've added this task: ");
                         System.out.println(tasks.get(index));
                         index++;
                     } else {
                         isValidCommand = true;
-                        dealWithTodo(tasks, index, line);
+                        dealWithTodo(tasks, index, line, isInTxt);
                         writeToFile("TaskList.txt", tasks.get(index));
                         System.out.println("Got it. I've added this task: ");
                         System.out.println(tasks.get(index));
@@ -206,4 +236,4 @@ public ManageInputs(ArrayList<Task> tasks, int index, String line) throws IOExce
         }
         System.out.println("Bye. Hope to see you again soon!");
     }
-}
+}
\ No newline at end of file

From 61216db1637d89d14f8311fa42c959d044c42f36 Mon Sep 17 00:00:00 2001
From: hongyijie06 <hongyijie06@gmail.com>
Date: Sat, 2 Mar 2024 23:42:49 +0800
Subject: [PATCH 17/28] add saveToFile

---
 src/main/java/ManageInputs.java | 34 +++++++++++++++++++--------------
 1 file changed, 20 insertions(+), 14 deletions(-)

diff --git a/src/main/java/ManageInputs.java b/src/main/java/ManageInputs.java
index 587f0af4c..b75dc2d2e 100644
--- a/src/main/java/ManageInputs.java
+++ b/src/main/java/ManageInputs.java
@@ -17,8 +17,8 @@ private static void writeToFile(String filePath, Task textToAdd) throws IOExcept
     }
 
 
-
-    private static int fillFileContents(ArrayList<Task> tasks, String filePath, int index, boolean isInTxt) throws IOException, UnexpectedCommandException {//updates index
+//file -> tasks
+    private static int fillFileContents(ArrayList<Task> tasks, String filePath, int index) throws IOException, UnexpectedCommandException {//updates index
         File f = new File(filePath); // create a File for the given file path
         Scanner s = new Scanner(f); // create a Scanner using the File as the source
 
@@ -32,13 +32,19 @@ private static int fillFileContents(ArrayList<Task> tasks, String filePath, int
             } else if (sLine.contains("[T]")) {
                 dealWithTodo(tasks, index, sLine, true);
             }
+            boolean isInTxt = false;
             index++;
         }
-        isInTxt = false;
+
         return index;
     }
 
-
+private void saveToFile(ArrayList<Task> tasks, int index) throws IOException{
+    new FileWriter("TaskList.txt", false).close();
+    for (int TaskIndex = 0; TaskIndex < index; TaskIndex ++) {
+        writeToFile("TaskList.txt", tasks.get(TaskIndex));
+    }
+}
 
     public static void dealWithEvent(ArrayList<Task> tasks, int index, String line, boolean isInTxt) throws UnexpectedCommandException, IOException {
         int indexTo = line.lastIndexOf("to");
@@ -77,10 +83,8 @@ public static void dealWithEvent(ArrayList<Task> tasks, int index, String line,
         } else {
             from = line.substring(indexFrom + 6, indexTo - 1);
             to = line.substring(indexTo + 4, line.length() - 1);
-            description = line.substring(5, indexFrom - 1);
-        } //when uncomment this, cannot add but reads file contents properly
-        //when commented, can add but cannot read file contents properly
-        //System.out.println(isInTxt);
+            description = line.substring(6, indexFrom - 1);
+        }
 
         tasks.add(index, new Event(description, from, to));
     }
@@ -150,7 +154,7 @@ private void handleEmptyInput(String line) throws EmptyLineException {
 
     public ManageInputs(ArrayList<Task> tasks, int index, String line) throws IOException, UnexpectedCommandException {
         boolean isInTxt = false;
-        index = fillFileContents(tasks, "TaskList.txt", index, isInTxt);
+        index = fillFileContents(tasks, "TaskList.txt", index);
 
         while (!line.equals("bye")) {
             Boolean isValidCommand = false;
@@ -166,12 +170,14 @@ public ManageInputs(ArrayList<Task> tasks, int index, String line) throws IOExce
                 tasks.get(idx - 1).markAsDone();
                 System.out.println("Nice! I've marked this task as done: ");
                 System.out.println(tasks.get(idx - 1));
+                saveToFile(tasks, index);
             } else if (inputs[0].equals("unmark")) {//unmark done
                 isValidCommand = true;
                 int idx = Integer.parseInt(inputs[1]);
                 tasks.get(idx - 1).unmarkDone();
                 System.out.println("OK, I've marked this task as not done yet: ");
                 System.out.println(tasks.get(idx - 1));
+                saveToFile(tasks, index);
             } else if (line.equals("list")) {//lists tasks
                 isValidCommand = true;
                 System.out.println("Here are the tasks in your list: ");
@@ -181,10 +187,7 @@ public ManageInputs(ArrayList<Task> tasks, int index, String line) throws IOExce
                 }
             } else if (line.equals("bye")) {//exit chat
                 isValidCommand = true;
-
-
-
-
+                saveToFile(tasks, index);
                 break;
             } else if (inputs[0].equals("event") || inputs[0].equals("todo") || inputs[0].equals("deadline")) {//add items
                 try {
@@ -217,12 +220,15 @@ public ManageInputs(ArrayList<Task> tasks, int index, String line) throws IOExce
                 System.out.println("Now you have " + tasks.size() + " tasks in the list.");
             } else if (inputs[0].equals("delete")) {
                 isValidCommand = true;
+                fillFileContents(tasks, "TaskList.txt", index);
                 int idx = Integer.parseInt(inputs[1]);
                 System.out.println("Noted. I've removed this task: ");
                 System.out.println(tasks.get(idx - 1));
                 tasks.remove(idx - 1);
-                System.out.println("Now you have " + tasks.size() + " tasks in the list.");
                 index--;
+                System.out.println("Now you have " + index + " tasks in the list.");
+                saveToFile(tasks, index);
+
             } else {
                 try {
                     handleEmptyInput(line);

From 996ba2b9a0c58e4600300eedc050aeb3aba7e58e Mon Sep 17 00:00:00 2001
From: hongyijie06 <hongyijie06@gmail.com>
Date: Sun, 3 Mar 2024 17:51:39 +0800
Subject: [PATCH 18/28] fix file not found error

---
 src/main/java/CreateFile.java |  2 +-
 src/main/java/Duke.java       | 19 ++++++++++++++++---
 2 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/src/main/java/CreateFile.java b/src/main/java/CreateFile.java
index 32ac2b64e..424a2b3a2 100644
--- a/src/main/java/CreateFile.java
+++ b/src/main/java/CreateFile.java
@@ -2,7 +2,7 @@
 import java.io.IOException;
 
 public class CreateFile {
-    public static void main(String[] args) {
+    public static void CreateFile(){
         File f = new File("TaskList.txt");
         if (!f.exists()) {
             try {
diff --git a/src/main/java/Duke.java b/src/main/java/Duke.java
index 770e0ea1c..c7136f3e8 100644
--- a/src/main/java/Duke.java
+++ b/src/main/java/Duke.java
@@ -15,7 +15,7 @@ private static void printFileContents(String filePath) throws FileNotFoundExcept
         }
     }
 
-    public static void main(String[] args) throws UnexpectedCommandException, EmptyLineException, IOException {
+    public static void main(String[] args) throws UnexpectedCommandException, EmptyLineException, IOException, FileNotFoundException {
         ArrayList<Task> tasks = new ArrayList<Task>();
 
         //greeting
@@ -26,12 +26,25 @@ public static void main(String[] args) throws UnexpectedCommandException, EmptyL
             printFileContents("TaskList.txt");
 
         } catch (FileNotFoundException e) {
-            File f = new File("TaskList.txt");
             System.out.println("File not found");
-            System.out.println("File created: " + f.getAbsolutePath());
         }
         int index = 0;//number of items in the list
         String line = " ";
+        File f = new File("TaskList.txt");
+        if (!f.exists()) {
+            try {
+                if (f.createNewFile()) {
+                    System.out.println("File created: " + f.getAbsolutePath());
+                } else {
+                    System.out.println("File creation failed.");
+                }
+            } catch (IOException e) {
+                System.out.println("An error occurred.");
+                e.printStackTrace();
+            }
+        } else {
+            System.out.println("File already exists: " + f.getAbsolutePath());
+        }
 
         new ManageInputs(tasks, index, line);
     }

From 7162ac7c59ff2c8efb7188baa13bb4c7dbe1d24f Mon Sep 17 00:00:00 2001
From: hongyijie06 <hongyijie06@gmail.com>
Date: Thu, 7 Mar 2024 03:04:29 +0800
Subject: [PATCH 19/28] use more oop

---
 src/main/java/ManageInputs.java | 245 --------------------------------
 src/main/java/Parser.java       | 105 ++++++++++++++
 src/main/java/Storage.java      |   2 +
 src/main/java/TaskList.java     |   2 +
 src/main/java/Ui.java           |   2 +
 5 files changed, 111 insertions(+), 245 deletions(-)
 delete mode 100644 src/main/java/ManageInputs.java
 create mode 100644 src/main/java/Parser.java
 create mode 100644 src/main/java/Storage.java
 create mode 100644 src/main/java/TaskList.java
 create mode 100644 src/main/java/Ui.java

diff --git a/src/main/java/ManageInputs.java b/src/main/java/ManageInputs.java
deleted file mode 100644
index b75dc2d2e..000000000
--- a/src/main/java/ManageInputs.java
+++ /dev/null
@@ -1,245 +0,0 @@
-import java.io.File;
-import java.io.FileWriter;
-import java.io.IOException;
-import java.util.ArrayList;
-import java.util.Scanner;
-
-public class ManageInputs {
-    protected static String from;
-    protected static String to;
-    public static String description;
-    protected static String by;
-
-    private static void writeToFile(String filePath, Task textToAdd) throws IOException {
-        FileWriter fw = new FileWriter(filePath, true);
-        fw.write(textToAdd + "\n");
-        fw.close();
-    }
-
-
-//file -> tasks
-    private static int fillFileContents(ArrayList<Task> tasks, String filePath, int index) throws IOException, UnexpectedCommandException {//updates index
-        File f = new File(filePath); // create a File for the given file path
-        Scanner s = new Scanner(f); // create a Scanner using the File as the source
-
-        while (s.hasNext()) {
-
-            String sLine = s.nextLine();
-            if (sLine.contains("[E]")) {
-                dealWithEvent(tasks, index, sLine, true);
-            } else if (sLine.contains("[D]")) {
-                dealWithDeadline(tasks, index, sLine, true);
-            } else if (sLine.contains("[T]")) {
-                dealWithTodo(tasks, index, sLine, true);
-            }
-            boolean isInTxt = false;
-            index++;
-        }
-
-        return index;
-    }
-
-private void saveToFile(ArrayList<Task> tasks, int index) throws IOException{
-    new FileWriter("TaskList.txt", false).close();
-    for (int TaskIndex = 0; TaskIndex < index; TaskIndex ++) {
-        writeToFile("TaskList.txt", tasks.get(TaskIndex));
-    }
-}
-
-    public static void dealWithEvent(ArrayList<Task> tasks, int index, String line, boolean isInTxt) throws UnexpectedCommandException, IOException {
-        int indexTo = line.lastIndexOf("to");
-        int indexFrom = line.indexOf("from");
-        String from;
-        String to;
-        String description;
-
-        if ((indexTo == -1) || (indexFrom == -1)) { //invalid format
-            System.out.println("Invalid format! Enter event in the format: event (description) from (start) to (end)");
-            throw new UnexpectedCommandException();
-        }
-        try {//timeline not specified/ both not specified
-            from = line.substring(indexFrom + 5, indexTo - 1);
-            to = line.substring(indexTo + 2);
-        } catch (IndexOutOfBoundsException e) {
-            try {
-                description = line.substring(5, indexFrom - 1);
-            } catch (IndexOutOfBoundsException f) {
-                System.out.println("event description and timeline not specified");
-                throw new UnexpectedCommandException();
-            }
-            System.out.println("event timeline not specified");
-            throw new UnexpectedCommandException();
-        }
-        try {//description not specified
-            description = line.substring(5, indexFrom - 1);
-        } catch (IndexOutOfBoundsException e) {
-            System.out.println("event description not specified");
-            throw new UnexpectedCommandException();
-        }
-        if(!isInTxt) {
-            from = line.substring(indexFrom + 5, indexTo - 1);
-            to = line.substring(indexTo + 3);
-            description = line.substring(5, indexFrom - 1);
-        } else {
-            from = line.substring(indexFrom + 6, indexTo - 1);
-            to = line.substring(indexTo + 4, line.length() - 1);
-            description = line.substring(6, indexFrom - 1);
-        }
-
-        tasks.add(index, new Event(description, from, to));
-    }
-
-    public static void dealWithDeadline(ArrayList<Task> tasks, int index, String line, boolean isInTxt) throws UnexpectedCommandException, IOException {
-        int indexBy = line.indexOf("by");
-        int space = line.indexOf(" ");
-        String by;
-        String description;
-        if (indexBy == -1) {//invalid format
-            System.out.println("Invalid format! Enter deadline in the format: deadline (description) by (deadline)");
-            throw new UnexpectedCommandException();
-        }
-        try {//deadline / both not specified
-            by = line.substring(indexBy + 2);
-        } catch (IndexOutOfBoundsException e) {
-            try {
-                description = line.substring(space, indexBy - 1);
-            } catch (IndexOutOfBoundsException f) {
-                System.out.println("deadline description and deadline not specified");
-                throw new UnexpectedCommandException();
-            }
-            System.out.println("deadline not specified");
-            throw new UnexpectedCommandException();
-        }
-        try {//deadline not specified
-            description = line.substring(space, indexBy - 1);
-        } catch (IndexOutOfBoundsException e) {
-            System.out.println("deadline description not specified");
-            throw new UnexpectedCommandException();
-        }
-        if (!isInTxt) {
-            description = line.substring(space, indexBy - 1);
-            by = line.substring(indexBy + 3);
-        } else{
-            description = line.substring(space, indexBy - 1);
-            by = line.substring(indexBy + 4, line.length() - 1);
-        }
-
-        tasks.add(index, new Deadline(description, by));
-    }
-
-    public static void dealWithTodo(ArrayList<Task> tasks, int index, String line, boolean isInTxt) throws UnexpectedCommandException, IOException {
-        int indexSpace = line.indexOf(" ");
-        if (indexSpace == -1) {
-            System.out.println("todo description not specified");
-            throw new UnexpectedCommandException();
-        }
-
-        String description = line.substring(indexSpace);
-
-        tasks.add(index, new Todo(description));
-
-    }
-
-    private void handleUnexpectedCommand(boolean isValidCommand) throws UnexpectedCommandException {
-        if (!isValidCommand) {
-            throw new UnexpectedCommandException();
-        }
-    }
-
-    private void handleEmptyInput(String line) throws EmptyLineException {
-        if (line.isEmpty()) {
-            throw new EmptyLineException();
-        }
-    }
-
-    public ManageInputs(ArrayList<Task> tasks, int index, String line) throws IOException, UnexpectedCommandException {
-        boolean isInTxt = false;
-        index = fillFileContents(tasks, "TaskList.txt", index);
-
-        while (!line.equals("bye")) {
-            Boolean isValidCommand = false;
-            Scanner input = new Scanner(System.in);
-            line = input.nextLine();
-
-            Task t = new Task(line);
-            String[] inputs = line.split(" ");
-            
-            if (inputs[0].equals("mark")) {//mark as done
-                isValidCommand = true;
-                int idx = Integer.parseInt(inputs[1]);
-                tasks.get(idx - 1).markAsDone();
-                System.out.println("Nice! I've marked this task as done: ");
-                System.out.println(tasks.get(idx - 1));
-                saveToFile(tasks, index);
-            } else if (inputs[0].equals("unmark")) {//unmark done
-                isValidCommand = true;
-                int idx = Integer.parseInt(inputs[1]);
-                tasks.get(idx - 1).unmarkDone();
-                System.out.println("OK, I've marked this task as not done yet: ");
-                System.out.println(tasks.get(idx - 1));
-                saveToFile(tasks, index);
-            } else if (line.equals("list")) {//lists tasks
-                isValidCommand = true;
-                System.out.println("Here are the tasks in your list: ");
-
-                for (int i = 0; i < index; i++) {
-                    System.out.println((i + 1) + ". " + tasks.get(i));
-                }
-            } else if (line.equals("bye")) {//exit chat
-                isValidCommand = true;
-                saveToFile(tasks, index);
-                break;
-            } else if (inputs[0].equals("event") || inputs[0].equals("todo") || inputs[0].equals("deadline")) {//add items
-                try {
-                    if (inputs[0].equals("event")) {
-                        isValidCommand = true;
-                        dealWithEvent(tasks, index, line, isInTxt);
-                        writeToFile("TaskList.txt", tasks.get(index));
-                        System.out.println("Got it. I've added this task: ");
-                        System.out.println(tasks.get(index));
-                        index++;
-                    } else if (inputs[0].equals("deadline")) {
-                        isValidCommand = true;
-                        dealWithDeadline(tasks, index, line, isInTxt);
-                        writeToFile("TaskList.txt", tasks.get(index));
-                        System.out.println("Got it. I've added this task: ");
-                        System.out.println(tasks.get(index));
-                        index++;
-                    } else {
-                        isValidCommand = true;
-                        dealWithTodo(tasks, index, line, isInTxt);
-                        writeToFile("TaskList.txt", tasks.get(index));
-                        System.out.println("Got it. I've added this task: ");
-                        System.out.println(tasks.get(index));
-                        index++;
-                    }
-                } catch (UnexpectedCommandException e) {
-                } catch (IOException e) {
-                    throw new RuntimeException(e);
-                }
-                System.out.println("Now you have " + tasks.size() + " tasks in the list.");
-            } else if (inputs[0].equals("delete")) {
-                isValidCommand = true;
-                fillFileContents(tasks, "TaskList.txt", index);
-                int idx = Integer.parseInt(inputs[1]);
-                System.out.println("Noted. I've removed this task: ");
-                System.out.println(tasks.get(idx - 1));
-                tasks.remove(idx - 1);
-                index--;
-                System.out.println("Now you have " + index + " tasks in the list.");
-                saveToFile(tasks, index);
-
-            } else {
-                try {
-                    handleEmptyInput(line);
-                    handleUnexpectedCommand(isValidCommand);
-                } catch (UnexpectedCommandException e) {
-                    System.out.println("please enter a valid command");
-                } catch (EmptyLineException e) {
-                    System.out.println("enter a task");
-                }
-            }
-        }
-        System.out.println("Bye. Hope to see you again soon!");
-    }
-}
\ No newline at end of file
diff --git a/src/main/java/Parser.java b/src/main/java/Parser.java
new file mode 100644
index 000000000..3c68fe708
--- /dev/null
+++ b/src/main/java/Parser.java
@@ -0,0 +1,105 @@
+import java.io.File;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Scanner;
+
+public class ManageInputs {
+    protected static String from;
+    protected static String to;
+    public static String description;
+    protected static String by;
+    private static Ui ui;
+    private static Storage storage;
+
+    private void dealWithMark(String[] inputs, ArrayList<Task> tasks, int index, boolean isValidCommand) throws IOException {
+        isValidCommand = true;
+        int idx = Integer.parseInt(inputs[1]);
+        tasks.get(idx - 1).markAsDone();
+        System.out.println("Nice! I've marked this task as done: ");
+        System.out.println(tasks.get(idx - 1));
+        storage.saveToFile(tasks, index);
+    }
+
+    private void dealWithUnmark(String[] inputs, ArrayList<Task> tasks, int index, boolean isValidCommand) throws IOException {
+        isValidCommand = true;
+        int idx = Integer.parseInt(inputs[1]);
+        tasks.get(idx - 1).unmarkDone();
+        System.out.println("OK, I've marked this task as not done yet: ");
+        System.out.println(tasks.get(idx - 1));
+        storage.saveToFile(tasks, index);
+    }
+
+    private void listTasks(ArrayList<Task> tasks, int index, boolean isValidCommand){
+        isValidCommand = true;
+        System.out.println("Here are the tasks in your list: ");
+
+        for (int i = 0; i < index; i++) {
+            System.out.println((i + 1) + ". " + tasks.get(i));
+        }
+    }
+
+    private void deleteTask(ArrayList<Task> tasks, String[] inputs, int index, boolean isValidCommand) throws UnexpectedCommandException, IOException {
+        isValidCommand = true;
+        Storage.fillFileContents(tasks, "TaskList.txt", index);
+        TaskList.dealWithDelete(inputs[1], tasks);
+        index--;
+        System.out.println("Now you have " + index + " tasks in the list.");
+        storage.saveToFile(tasks, index);
+    }
+
+    private void handleUnexpectedCommand(boolean isValidCommand) throws UnexpectedCommandException {
+        if (!isValidCommand) {
+            throw new UnexpectedCommandException();
+        }
+    }
+
+    private void handleEmptyInput(String line) throws EmptyLineException {
+        if (line.isEmpty()) {
+            throw new EmptyLineException();
+        }
+    }
+
+    public ManageInputs(ArrayList<Task> tasks, int index, String line) throws IOException, UnexpectedCommandException {
+        boolean isInTxt = false;
+        index = Storage.fillFileContents(tasks, "TaskList.txt", index);
+        ui = new Ui();
+
+        while (!line.equals("bye")) {
+            ui.readCommand();
+            Boolean isValidCommand = false;
+            Scanner input = new Scanner(System.in);
+            line = input.nextLine();
+
+            Task t = new Task(line);
+            String[] inputs = line.split(" ");
+            
+            if (inputs[0].equals("mark")) {//mark as done
+                dealWithMark(inputs, tasks, index, isValidCommand);
+            } else if (inputs[0].equals("unmark")) {//unmark done
+                dealWithUnmark(inputs, tasks, index, isValidCommand);
+            } else if (line.equals("list")) {//lists tasks
+                listTasks(tasks, index, isValidCommand);
+            } else if (line.equals("bye")) {//exit chat
+                isValidCommand = true;
+                storage.saveToFile(tasks, index);
+                break;
+            } else if (inputs[0].equals("event") || inputs[0].equals("todo") || inputs[0].equals("deadline")) {//add items
+                TaskList.addTasks(tasks, inputs, index, line, isInTxt, isValidCommand);
+            } else if (inputs[0].equals("delete")) {
+                deleteTask(tasks, inputs, index, isValidCommand);
+
+            } else {
+                try {
+                    handleEmptyInput(line);
+                    handleUnexpectedCommand(isValidCommand);
+                } catch (UnexpectedCommandException e) {
+                    ui.errorMessage("Please enter a valid command");
+                } catch (EmptyLineException e) {
+                    ui.errorMessage("No input detected. Please enter a task");
+                }
+            }
+        }
+        ui.sayBye();
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/Storage.java b/src/main/java/Storage.java
new file mode 100644
index 000000000..ee840ea8b
--- /dev/null
+++ b/src/main/java/Storage.java
@@ -0,0 +1,2 @@
+package PACKAGE_NAME;public class Storage {
+}
diff --git a/src/main/java/TaskList.java b/src/main/java/TaskList.java
new file mode 100644
index 000000000..685983890
--- /dev/null
+++ b/src/main/java/TaskList.java
@@ -0,0 +1,2 @@
+package PACKAGE_NAME;public class TaskList {
+}
diff --git a/src/main/java/Ui.java b/src/main/java/Ui.java
new file mode 100644
index 000000000..b6aacac25
--- /dev/null
+++ b/src/main/java/Ui.java
@@ -0,0 +1,2 @@
+package PACKAGE_NAME;public class Ui {
+}

From 7a5826c8b085f7bb8b84963bc82b63e8613a9ccd Mon Sep 17 00:00:00 2001
From: hongyijie06 <hongyijie06@gmail.com>
Date: Thu, 7 Mar 2024 03:28:11 +0800
Subject: [PATCH 20/28] fix loading file errors

---
 src/main/java/Duke.java     |   9 ++-
 src/main/java/Parser.java   |  84 ++++++++++++++++------
 src/main/java/Storage.java  |  43 ++++++++++-
 src/main/java/TaskList.java | 138 +++++++++++++++++++++++++++++++++++-
 src/main/java/Ui.java       |  20 +++++-
 5 files changed, 265 insertions(+), 29 deletions(-)

diff --git a/src/main/java/Duke.java b/src/main/java/Duke.java
index c7136f3e8..220fbd781 100644
--- a/src/main/java/Duke.java
+++ b/src/main/java/Duke.java
@@ -15,12 +15,11 @@ private static void printFileContents(String filePath) throws FileNotFoundExcept
         }
     }
 
+    private static Ui ui;
     public static void main(String[] args) throws UnexpectedCommandException, EmptyLineException, IOException, FileNotFoundException {
         ArrayList<Task> tasks = new ArrayList<Task>();
-
-        //greeting
-        System.out.println("Hello! I'm Apple");
-        System.out.println("What can I do for you?");
+        ui = new Ui();
+        ui.sayHi();
         try {
             System.out.println("Here are the items in your task list: ");
             printFileContents("TaskList.txt");
@@ -46,6 +45,6 @@ public static void main(String[] args) throws UnexpectedCommandException, EmptyL
             System.out.println("File already exists: " + f.getAbsolutePath());
         }
 
-        new ManageInputs(tasks, index, line);
+        new Parser(tasks, index, line);
     }
 }
diff --git a/src/main/java/Parser.java b/src/main/java/Parser.java
index 3c68fe708..760eb4bcd 100644
--- a/src/main/java/Parser.java
+++ b/src/main/java/Parser.java
@@ -1,33 +1,41 @@
-import java.io.File;
-import java.io.FileWriter;
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Scanner;
 
-public class ManageInputs {
+public class Parser {
     protected static String from;
     protected static String to;
     public static String description;
     protected static String by;
     private static Ui ui;
     private static Storage storage;
+    private static TaskList tasklist;
 
     private void dealWithMark(String[] inputs, ArrayList<Task> tasks, int index, boolean isValidCommand) throws IOException {
         isValidCommand = true;
-        int idx = Integer.parseInt(inputs[1]);
-        tasks.get(idx - 1).markAsDone();
-        System.out.println("Nice! I've marked this task as done: ");
-        System.out.println(tasks.get(idx - 1));
-        storage.saveToFile(tasks, index);
+        try {
+            int idx = Integer.parseInt(inputs[1]);
+            tasks.get(idx - 1).markAsDone();
+            System.out.println("Nice! I've marked this task as done: ");
+            System.out.println(tasks.get(idx - 1));
+            storage.saveToFile(tasks, index);
+        } catch (IndexOutOfBoundsException e){
+            ui.errorMessage("did not indicate which task to mark");
+        }
+
     }
 
     private void dealWithUnmark(String[] inputs, ArrayList<Task> tasks, int index, boolean isValidCommand) throws IOException {
         isValidCommand = true;
-        int idx = Integer.parseInt(inputs[1]);
-        tasks.get(idx - 1).unmarkDone();
-        System.out.println("OK, I've marked this task as not done yet: ");
-        System.out.println(tasks.get(idx - 1));
-        storage.saveToFile(tasks, index);
+        try {
+            int idx = Integer.parseInt(inputs[1]);
+            tasks.get(idx - 1).unmarkDone();
+            System.out.println("OK, I've marked this task as not done yet: ");
+            System.out.println(tasks.get(idx - 1));
+            storage.saveToFile(tasks, index);
+        } catch (IndexOutOfBoundsException e){
+            ui.errorMessage("did not indicate which task to unmark");
+        }
     }
 
     private void listTasks(ArrayList<Task> tasks, int index, boolean isValidCommand){
@@ -39,15 +47,17 @@ private void listTasks(ArrayList<Task> tasks, int index, boolean isValidCommand)
         }
     }
 
-    private void deleteTask(ArrayList<Task> tasks, String[] inputs, int index, boolean isValidCommand) throws UnexpectedCommandException, IOException {
+    private int deleteTask(ArrayList<Task> tasks, String[] inputs, int index, boolean isValidCommand) throws UnexpectedCommandException, IOException {
         isValidCommand = true;
         Storage.fillFileContents(tasks, "TaskList.txt", index);
-        TaskList.dealWithDelete(inputs[1], tasks);
+        TaskList.dealWithDelete(inputs, inputs[1], tasks);
         index--;
         System.out.println("Now you have " + index + " tasks in the list.");
         storage.saveToFile(tasks, index);
+        return index;
     }
 
+
     private void handleUnexpectedCommand(boolean isValidCommand) throws UnexpectedCommandException {
         if (!isValidCommand) {
             throw new UnexpectedCommandException();
@@ -60,9 +70,10 @@ private void handleEmptyInput(String line) throws EmptyLineException {
         }
     }
 
-    public ManageInputs(ArrayList<Task> tasks, int index, String line) throws IOException, UnexpectedCommandException {
-        boolean isInTxt = false;
+    public Parser(ArrayList<Task> tasks, int index, String line) throws IOException, IndexOutOfBoundsException, UnexpectedCommandException {
+        boolean isInTxt = true;
         index = Storage.fillFileContents(tasks, "TaskList.txt", index);
+        isInTxt = false;
         ui = new Ui();
 
         while (!line.equals("bye")) {
@@ -76,19 +87,50 @@ public ManageInputs(ArrayList<Task> tasks, int index, String line) throws IOExce
             
             if (inputs[0].equals("mark")) {//mark as done
                 dealWithMark(inputs, tasks, index, isValidCommand);
+                Storage.saveToFile(tasks, index);
             } else if (inputs[0].equals("unmark")) {//unmark done
                 dealWithUnmark(inputs, tasks, index, isValidCommand);
+                Storage.saveToFile(tasks, index);
             } else if (line.equals("list")) {//lists tasks
                 listTasks(tasks, index, isValidCommand);
             } else if (line.equals("bye")) {//exit chat
                 isValidCommand = true;
-                storage.saveToFile(tasks, index);
+                Storage.saveToFile(tasks, index);
                 break;
             } else if (inputs[0].equals("event") || inputs[0].equals("todo") || inputs[0].equals("deadline")) {//add items
-                TaskList.addTasks(tasks, inputs, index, line, isInTxt, isValidCommand);
-            } else if (inputs[0].equals("delete")) {
-                deleteTask(tasks, inputs, index, isValidCommand);
+                try {
+                    if (inputs[0].equals("event")) {
+                        isValidCommand = true;
+                        TaskList.dealWithEvent(tasks, index, line, isInTxt);
+                        Storage.writeToFile("TaskList.txt", tasks.get(index));
+                        System.out.println("Got it. I've added this task: ");
+                        System.out.println(tasks.get(index));
+                        index++;
+                    } else if (inputs[0].equals("deadline")) {
+                        isValidCommand = true;
+                        TaskList.dealWithDeadline(tasks, index, line, isInTxt);
+                        Storage.writeToFile("TaskList.txt", tasks.get(index));
+                        System.out.println("Got it. I've added this task: ");
+                        System.out.println(tasks.get(index));
+                        index++;
+                    } else {
+                        isValidCommand = true;
+                        TaskList.dealWithTodo(tasks, index, line, isInTxt);
+                        Storage.writeToFile("TaskList.txt", tasks.get(index));
+                        System.out.println("Got it. I've added this task: ");
+                        System.out.println(tasks.get(index));
+                        index++;
+                    }
+                } catch (IOException | UnexpectedCommandException | IndexOutOfBoundsException e) {
+                }
+                System.out.println("Now you have " + index + " tasks in the list.");
 
+            } else if (inputs[0].equals("delete")) {
+                try {
+                    index = deleteTask(tasks, inputs, index, isValidCommand);
+                } catch (ArrayIndexOutOfBoundsException e){
+                    System.out.println("please secify which task you want to delete");
+                }
             } else {
                 try {
                     handleEmptyInput(line);
diff --git a/src/main/java/Storage.java b/src/main/java/Storage.java
index ee840ea8b..b90b61027 100644
--- a/src/main/java/Storage.java
+++ b/src/main/java/Storage.java
@@ -1,2 +1,43 @@
-package PACKAGE_NAME;public class Storage {
+import java.io.File;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Scanner;
+
+public class Storage {
+    public static int fillFileContents(ArrayList<Task> tasks, String filePath, int index) throws IOException, UnexpectedCommandException {//updates index
+        File f = new File(filePath); // create a File for the given file path
+        Scanner s = new Scanner(f); // create a Scanner using the File as the source
+
+        while (s.hasNext()) {
+
+            String sLine = s.nextLine();
+
+            if (sLine.contains("[E]")) {
+                TaskList.dealWithEvent(tasks, index, sLine, true);
+            } else if (sLine.contains("[D]")) {
+                TaskList.dealWithDeadline(tasks, index, sLine, true);
+            } else if (sLine.contains("[T]")) {
+                TaskList.dealWithTodo(tasks, index, sLine, true);
+            }
+
+            index++;
+        }
+        boolean isInTxt = false;
+        //System.out.println("filling contents");
+        return index;
+    }
+
+    protected static void saveToFile(ArrayList<Task> tasks, int index) throws IOException{
+        new FileWriter("TaskList.txt", false).close();
+        for (int TaskIndex = 0; TaskIndex < index; TaskIndex ++) {
+            writeToFile("TaskList.txt", tasks.get(TaskIndex));
+        }
+    }
+
+    static void writeToFile(String filePath, Task textToAdd) throws IOException{
+        FileWriter fw = new FileWriter(filePath, true);
+        fw.write(textToAdd + "\n");
+        fw.close();
+    }
 }
diff --git a/src/main/java/TaskList.java b/src/main/java/TaskList.java
index 685983890..7eea9c8ca 100644
--- a/src/main/java/TaskList.java
+++ b/src/main/java/TaskList.java
@@ -1,2 +1,138 @@
-package PACKAGE_NAME;public class TaskList {
+import java.io.IOException;
+import java.util.ArrayList;
+
+public class TaskList {
+    protected static Ui ui;
+    protected static ArrayList<Task> tasks;
+    public TaskList(){
+        this.tasks = tasks;
+    }
+
+    public static void dealWithEvent(ArrayList<Task> tasks, int index, String line, boolean isInTxt) throws UnexpectedCommandException, IOException {
+        int indexTo = line.lastIndexOf("to");
+        int indexFrom = line.indexOf("from");
+        String from;
+        String to;
+        String description;
+
+        if ((indexTo == -1) || (indexFrom == -1)) { //invalid format
+            ui.errorMessage("Invalid format! Enter event in the format: event (description) from (start) to (end)");
+            throw new UnexpectedCommandException();
+        }
+        try {//timeline not specified/ both not specified
+            from = line.substring(indexFrom + 5, indexTo - 1);
+            to = line.substring(indexTo + 3);
+        } catch (IndexOutOfBoundsException e) {
+            try {
+                description = line.substring(6, indexFrom - 1);
+            } catch (IndexOutOfBoundsException f) {
+                ui.errorMessage("event description and timeline not specified");
+                throw new UnexpectedCommandException();
+            }
+            ui.errorMessage("event timeline not specified");
+            throw new UnexpectedCommandException();
+        }
+        try {//description not specified
+            description = line.substring(6, indexFrom - 1);
+        } catch (IndexOutOfBoundsException e) {
+            ui.errorMessage("event description not specified");
+            throw new UnexpectedCommandException();
+        }
+        if(!isInTxt) {
+            from = line.substring(indexFrom + 5, indexTo - 1);
+            to = line.substring(indexTo + 3);
+            description = line.substring(5, indexFrom - 1);
+        } else {
+
+            from = line.substring(indexFrom + 6, indexTo - 1);
+            to = line.substring(indexTo + 4, line.length() - 1);
+            description = line.substring(6, indexFrom - 1);
+
+
+        }
+        tasks.add(index, new Event(description, from, to));
+        if (isInTxt){
+            char[] charArray = line.toCharArray();
+            if (charArray[4] == '1'){
+                tasks.get(index).markAsDone();
+            } else{
+                tasks.get(index).unmarkDone();
+            }
+        }
+    }
+
+    public static void dealWithDeadline(ArrayList<Task> tasks, int index, String line, boolean isInTxt) throws UnexpectedCommandException, IOException {
+        int indexBy = line.indexOf("by");
+        int space = line.indexOf(" ");
+        String by;
+        String description;
+        if (indexBy == -1) {//invalid format
+            ui.errorMessage("Invalid format! Enter deadline in the format: deadline (description) by (deadline)");
+            throw new UnexpectedCommandException();
+        }
+        try {//deadline / both not specified
+            by = line.substring(indexBy + 3);
+        } catch (IndexOutOfBoundsException e) {
+            try {
+                description = line.substring(space + 1, indexBy - 1);
+            } catch (IndexOutOfBoundsException f) {
+                ui.errorMessage("deadline description and deadline not specified");
+                throw new UnexpectedCommandException();
+            }
+            ui.errorMessage("deadline not specified");
+            throw new UnexpectedCommandException();
+        }
+        try {//deadline not specified
+            description = line.substring(space + 1, indexBy - 1);
+        } catch (IndexOutOfBoundsException e) {
+            ui.errorMessage("deadline description not specified");
+            throw new UnexpectedCommandException();
+        }
+        if (!isInTxt) {
+            description = line.substring(space, indexBy - 1);
+            by = line.substring(indexBy + 3);
+        } else{
+            description = line.substring(space, indexBy - 1);
+            by = line.substring(indexBy + 4, line.length() - 1);
+        }
+
+        tasks.add(index, new Deadline(description, by));
+        if (isInTxt){
+            char[] charArray = line.toCharArray();
+            if (charArray[4] == '1'){
+                tasks.get(index).markAsDone();
+            } else{
+                tasks.get(index).unmarkDone();
+            }
+        }
+    }
+
+    public static void dealWithTodo(ArrayList<Task> tasks, int index, String line, boolean isInTxt) throws UnexpectedCommandException, IOException {
+        int indexSpace = line.indexOf(" ");
+        if (indexSpace == -1) {
+            ui.errorMessage("todo description not specified");
+            throw new UnexpectedCommandException();
+        }
+
+        String description = line.substring(indexSpace);
+        tasks.add(index, new Todo(description));
+        if (isInTxt){
+            char[] charArray = line.toCharArray();
+            if (charArray[4] == '1'){
+                tasks.get(index).markAsDone();
+            } else{
+                tasks.get(index).unmarkDone();
+            }
+        }
+
+    }
+
+    public static void dealWithDelete (String[] inputs, String ListIndex, ArrayList<Task> tasks){
+        if (inputs[0].equals("delete")) {
+            int idx = Integer.parseInt(ListIndex);
+            System.out.println("Noted. I've removed this task: ");
+            System.out.println(tasks.get(idx - 1));
+            tasks.remove(idx - 1);
+        }
+    }
 }
diff --git a/src/main/java/Ui.java b/src/main/java/Ui.java
index b6aacac25..bf962a771 100644
--- a/src/main/java/Ui.java
+++ b/src/main/java/Ui.java
@@ -1,2 +1,20 @@
-package PACKAGE_NAME;public class Ui {
+import java.io.FileNotFoundException;
+
+public class Ui {
+    public void sayHi(){
+        System.out.println("Hello! I'm Apple");
+        System.out.println("What can I do for you?");
+    }
+
+    public void readCommand(){
+        System.out.print("Enter your command: ");
+    }
+
+    public static void errorMessage(String message){
+        System.out.println(message);
+    }
+
+    public void sayBye(){
+        System.out.println("Bye. Hope to see you again soon!");
+    }
 }

From 4a60dbe4472dd6a8fd308309e092fcabe5341c90 Mon Sep 17 00:00:00 2001
From: hongyijie06 <hongyijie06@gmail.com>
Date: Thu, 7 Mar 2024 13:21:07 +0800
Subject: [PATCH 21/28] add find

---
 src/main/java/Parser.java  | 23 +++++++++++++++++++++++
 src/main/java/Storage.java |  1 -
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/src/main/java/Parser.java b/src/main/java/Parser.java
index 760eb4bcd..55b1e5e00 100644
--- a/src/main/java/Parser.java
+++ b/src/main/java/Parser.java
@@ -11,6 +11,8 @@ public class Parser {
     private static Storage storage;
     private static TaskList tasklist;
 
+    public String findInput;
+
     private void dealWithMark(String[] inputs, ArrayList<Task> tasks, int index, boolean isValidCommand) throws IOException {
         isValidCommand = true;
         try {
@@ -57,6 +59,21 @@ private int deleteTask(ArrayList<Task> tasks, String[] inputs, int index, boolea
         return index;
     }
 
+    private void dealWithFind(String findInput, ArrayList<Task> tasks, int index){
+        ArrayList<Task> matchingTasks = new ArrayList<Task>();
+        int matchingTasksIndex = 1;
+        System.out.println("Here are the matching tasks in your list: ");
+        for (int i = 0; i < index; i ++){
+            String xline = tasks.get(i).toString();
+            if (xline.contains(findInput)){
+                System.out.print(matchingTasksIndex + ". ");
+                matchingTasks.add(tasks.get(i));
+                System.out.println(matchingTasks.get(matchingTasksIndex - 1));
+                matchingTasksIndex ++;
+            }
+        }
+    }
+
 
     private void handleUnexpectedCommand(boolean isValidCommand) throws UnexpectedCommandException {
         if (!isValidCommand) {
@@ -131,6 +148,12 @@ public Parser(ArrayList<Task> tasks, int index, String line) throws IOException,
                 } catch (ArrayIndexOutOfBoundsException e){
                     System.out.println("please secify which task you want to delete");
                 }
+            } else if (inputs[0].equals("find")){
+                try {
+                    dealWithFind(inputs[1], tasks, index);
+                } catch (ArrayIndexOutOfBoundsException e){
+                    System.out.println("please state what you would like to find");
+                }
             } else {
                 try {
                     handleEmptyInput(line);
diff --git a/src/main/java/Storage.java b/src/main/java/Storage.java
index b90b61027..1545266a6 100644
--- a/src/main/java/Storage.java
+++ b/src/main/java/Storage.java
@@ -24,7 +24,6 @@ public static int fillFileContents(ArrayList<Task> tasks, String filePath, int i
             index++;
         }
         boolean isInTxt = false;
-        //System.out.println("filling contents");
         return index;
     }
 

From 2152ef7ccae13e8bf00288427ff53ee8c846b8bf Mon Sep 17 00:00:00 2001
From: hongyijie06 <hongyijie06@gmail.com>
Date: Thu, 7 Mar 2024 21:39:37 +0800
Subject: [PATCH 22/28] add javadoc

---
 src/main/java/CreateFile.java |  3 ++
 src/main/java/Deadline.java   |  3 ++
 src/main/java/Duke.java       |  5 ++++
 src/main/java/Event.java      |  3 ++
 src/main/java/Parser.java     | 52 ++++++++++++++++++++++++++++++++++-
 src/main/java/Storage.java    | 24 ++++++++++++++++
 src/main/java/Task.java       |  4 +++
 src/main/java/TaskList.java   | 36 ++++++++++++++++++++++++
 src/main/java/Todo.java       |  3 ++
 src/main/java/Ui.java         |  4 ++-
 10 files changed, 135 insertions(+), 2 deletions(-)

diff --git a/src/main/java/CreateFile.java b/src/main/java/CreateFile.java
index 424a2b3a2..b977750c6 100644
--- a/src/main/java/CreateFile.java
+++ b/src/main/java/CreateFile.java
@@ -1,6 +1,9 @@
 import java.io.File;
 import java.io.IOException;
 
+/**
+ * creates local TaskList.txt file on the local machine
+ */
 public class CreateFile {
     public static void CreateFile(){
         File f = new File("TaskList.txt");
diff --git a/src/main/java/Deadline.java b/src/main/java/Deadline.java
index bcd049672..941068471 100644
--- a/src/main/java/Deadline.java
+++ b/src/main/java/Deadline.java
@@ -1,3 +1,6 @@
+/**
+ * child class of Task to handle deadlines
+ */
 public class Deadline extends Task{
     protected String by;
 
diff --git a/src/main/java/Duke.java b/src/main/java/Duke.java
index 220fbd781..8cebfc61e 100644
--- a/src/main/java/Duke.java
+++ b/src/main/java/Duke.java
@@ -7,6 +7,11 @@
 
 public class Duke {
 
+    /**
+     * lists tasks saved in the local TaskList.txt file
+     * @param filePath the path to the local TaskList.txt file
+     * @throws FileNotFoundException exception when local TaskList.txt file does not exist
+     */
     private static void printFileContents(String filePath) throws FileNotFoundException {
         File f = new File(filePath); // create a File for the given file path
         Scanner s = new Scanner(f); // create a Scanner using the File as the source
diff --git a/src/main/java/Event.java b/src/main/java/Event.java
index 0c9973810..d61530a83 100644
--- a/src/main/java/Event.java
+++ b/src/main/java/Event.java
@@ -1,3 +1,6 @@
+/**
+ * child class of Task to handle events
+ */
 public class Event extends Task{
     protected String from;
     protected String to;
diff --git a/src/main/java/Parser.java b/src/main/java/Parser.java
index 55b1e5e00..c3465ff7a 100644
--- a/src/main/java/Parser.java
+++ b/src/main/java/Parser.java
@@ -2,6 +2,9 @@
 import java.util.ArrayList;
 import java.util.Scanner;
 
+/**
+ * deals with making sense of the user command
+ */
 public class Parser {
     protected static String from;
     protected static String to;
@@ -13,6 +16,14 @@ public class Parser {
 
     public String findInput;
 
+    /**
+     * marks task as done
+     * @param inputs the array of words the user input
+     * @param tasks the array of tasks
+     * @param index the number of tasks in the array of tasks
+     * @param isValidCommand boolean is true if the command from the user is a valid action
+     * @throws IOException exception when local TaskList.txt file does not exist
+     */
     private void dealWithMark(String[] inputs, ArrayList<Task> tasks, int index, boolean isValidCommand) throws IOException {
         isValidCommand = true;
         try {
@@ -27,6 +38,14 @@ private void dealWithMark(String[] inputs, ArrayList<Task> tasks, int index, boo
 
     }
 
+    /**
+     * marks task as undone
+     * @param inputs the array of words input by the user
+     * @param tasks the array of tasks
+     * @param index the number of tasks in the array of tasks
+     * @param isValidCommand boolean is true if the command from the user is a valid action
+     * @throws IOException exception when local TaskList.txt file does not exist
+     */
     private void dealWithUnmark(String[] inputs, ArrayList<Task> tasks, int index, boolean isValidCommand) throws IOException {
         isValidCommand = true;
         try {
@@ -40,6 +59,12 @@ private void dealWithUnmark(String[] inputs, ArrayList<Task> tasks, int index, b
         }
     }
 
+    /**
+     * lists tasks
+     * @param tasks the array of tasks
+     * @param index the number of tasks in the array of tasks
+     * @param isValidCommand boolean is true if the command from the user is a valid action
+     */
     private void listTasks(ArrayList<Task> tasks, int index, boolean isValidCommand){
         isValidCommand = true;
         System.out.println("Here are the tasks in your list: ");
@@ -49,6 +74,16 @@ private void listTasks(ArrayList<Task> tasks, int index, boolean isValidCommand)
         }
     }
 
+    /**
+     * deletes task
+     * @param tasks the array of tasks
+     * @param inputs the array of words input by the user
+     * @param index the number of tasks in the array of tasks
+     * @param isValidCommand boolean is true if the command from the user is a valid action
+     * @return the number of tasks in the array of tasks after deletion
+     * @throws UnexpectedCommandException exception when the format or details of the tasks are not followed and provided respectively
+     * @throws IOException exception when local TaskList.txt file does not exist
+     */
     private int deleteTask(ArrayList<Task> tasks, String[] inputs, int index, boolean isValidCommand) throws UnexpectedCommandException, IOException {
         isValidCommand = true;
         Storage.fillFileContents(tasks, "TaskList.txt", index);
@@ -59,6 +94,12 @@ private int deleteTask(ArrayList<Task> tasks, String[] inputs, int index, boolea
         return index;
     }
 
+    /**
+     * filters tasks with the keyword input by the user
+     * @param findInput the keyword the user is looking for
+     * @param tasks the array of tasks
+     * @param index the number of tasks in the array of tasks
+     */
     private void dealWithFind(String findInput, ArrayList<Task> tasks, int index){
         ArrayList<Task> matchingTasks = new ArrayList<Task>();
         int matchingTasksIndex = 1;
@@ -87,6 +128,15 @@ private void handleEmptyInput(String line) throws EmptyLineException {
         }
     }
 
+    /**
+     * handles the different commands input by the user
+     * @param tasks the array of tasks
+     * @param index the number of tasks in the array of tasks
+     * @param line the user input
+     * @throws IOException exception when local TaskList.txt file does not exist
+     * @throws IndexOutOfBoundsException exception when there is missing required details in the input
+     * @throws UnexpectedCommandException exception when the format or details of the tasks are not followed and provided respectively
+     */
     public Parser(ArrayList<Task> tasks, int index, String line) throws IOException, IndexOutOfBoundsException, UnexpectedCommandException {
         boolean isInTxt = true;
         index = Storage.fillFileContents(tasks, "TaskList.txt", index);
@@ -146,7 +196,7 @@ public Parser(ArrayList<Task> tasks, int index, String line) throws IOException,
                 try {
                     index = deleteTask(tasks, inputs, index, isValidCommand);
                 } catch (ArrayIndexOutOfBoundsException e){
-                    System.out.println("please secify which task you want to delete");
+                    System.out.println("please specify which task you want to delete");
                 }
             } else if (inputs[0].equals("find")){
                 try {
diff --git a/src/main/java/Storage.java b/src/main/java/Storage.java
index 1545266a6..6897d87ae 100644
--- a/src/main/java/Storage.java
+++ b/src/main/java/Storage.java
@@ -4,7 +4,19 @@
 import java.util.ArrayList;
 import java.util.Scanner;
 
+/**
+ * deals with loading tasks from the file and saving tasks in the file
+ */
 public class Storage {
+    /**
+     * loads ArrayList<Task> tasks with tasks saved on TaskList.txt
+     * @param tasks contains the list of tasks
+     * @param filePath the path to TaskList.txt saved on the local machine
+     * @param index the number of tasks saved in TaskList.txt
+     * @return index the number of tasks saved in TaskList.txt
+     * @throws IOException exception when local TaskList.txt file does not exist
+     * @throws UnexpectedCommandException exception when the format or details of the tasks are not followed and provided respectively
+     */
     public static int fillFileContents(ArrayList<Task> tasks, String filePath, int index) throws IOException, UnexpectedCommandException {//updates index
         File f = new File(filePath); // create a File for the given file path
         Scanner s = new Scanner(f); // create a Scanner using the File as the source
@@ -27,6 +39,12 @@ public static int fillFileContents(ArrayList<Task> tasks, String filePath, int i
         return index;
     }
 
+    /**
+     * saves the updated tasks list onto TaskList.txt in the local machine
+     * @param tasks the array of tasks
+     * @param index the nymber of tasks in array of tasks
+     * @throws IOException exception when local TaskList.txt file does not exist
+     */
     protected static void saveToFile(ArrayList<Task> tasks, int index) throws IOException{
         new FileWriter("TaskList.txt", false).close();
         for (int TaskIndex = 0; TaskIndex < index; TaskIndex ++) {
@@ -34,6 +52,12 @@ protected static void saveToFile(ArrayList<Task> tasks, int index) throws IOExce
         }
     }
 
+    /**
+     * adds additional tasks into TaskList.txt
+     * @param filePath the path to TaskList.txt saved on the local machine
+     * @param textToAdd the new task to add
+     * @throws IOException exception when local TaskList.txt file does not exist
+     */
     static void writeToFile(String filePath, Task textToAdd) throws IOException{
         FileWriter fw = new FileWriter(filePath, true);
         fw.write(textToAdd + "\n");
diff --git a/src/main/java/Task.java b/src/main/java/Task.java
index 43f4b8705..11b9b77da 100644
--- a/src/main/java/Task.java
+++ b/src/main/java/Task.java
@@ -1,3 +1,7 @@
+/**
+ * variables and functions that children classes of tasks inherit
+ * children classes in this chatbot include event, deadline and todo
+ */
 public class Task {
     protected String description;
     protected boolean isDone;
diff --git a/src/main/java/TaskList.java b/src/main/java/TaskList.java
index 7eea9c8ca..45ffe4f05 100644
--- a/src/main/java/TaskList.java
+++ b/src/main/java/TaskList.java
@@ -1,6 +1,9 @@
 import java.io.IOException;
 import java.util.ArrayList;
 
+/**
+ * contains the task list and operations to add or delete tasks
+ */
 public class TaskList {
     protected static Ui ui;
     protected static ArrayList<Task> tasks;
@@ -8,6 +11,15 @@ public TaskList(){
         this.tasks = tasks;
     }
 
+    /**
+     * adds event to array of tasks
+     * @param tasks the array of tasks
+     * @param index the number of tasks in the array of tasks
+     * @param line the input string from the user
+     * @param isInTxt true if ArrayList<Task> tasks is being loaded from TaskList.txt
+     * @throws UnexpectedCommandException exception when the format or details of the tasks are not followed and provided respectively
+     * @throws IOException exception when local TaskList.txt file does not exist
+     */
     public static void dealWithEvent(ArrayList<Task> tasks, int index, String line, boolean isInTxt) throws UnexpectedCommandException, IOException {
         int indexTo = line.lastIndexOf("to");
         int indexFrom = line.indexOf("from");
@@ -61,6 +73,15 @@ public static void dealWithEvent(ArrayList<Task> tasks, int index, String line,
         }
     }
 
+    /**
+     * adds deadline to array of tasks
+     * @param tasks the array of tasks
+     * @param index the number of tasks in the array of tasks
+     * @param line the input string from the user
+     * @param isInTxt true if ArrayList<Task> tasks is being loaded from TaskList.txt
+     * @throws UnexpectedCommandException exception when the format or details of the tasks are not followed and provided respectively
+     * @throws IOException exception when local TaskList.txt file does not exist
+     */
     public static void dealWithDeadline(ArrayList<Task> tasks, int index, String line, boolean isInTxt) throws UnexpectedCommandException, IOException {
         int indexBy = line.indexOf("by");
         int space = line.indexOf(" ");
@@ -107,6 +128,15 @@ public static void dealWithDeadline(ArrayList<Task> tasks, int index, String lin
         }
     }
 
+    /**
+     * adds todo to array of tasks
+     * @param tasks the array of tasks
+     * @param index the number of tasks in the array of tasks
+     * @param line the input string from the user
+     * @param isInTxt true if ArrayList<Task> tasks is being loaded from TaskList.txt
+     * @throws UnexpectedCommandException exception when the format or details of the tasks are not followed and provided respectively
+     * @throws IOException exception when local TaskList.txt file does not exist
+     */
     public static void dealWithTodo(ArrayList<Task> tasks, int index, String line, boolean isInTxt) throws UnexpectedCommandException, IOException {
         int indexSpace = line.indexOf(" ");
         if (indexSpace == -1) {
@@ -127,6 +157,12 @@ public static void dealWithTodo(ArrayList<Task> tasks, int index, String line, b
 
     }
 
+    /**
+     * deletes item from array of tasks
+     * @param inputs the array of words input by the user
+     * @param ListIndex the string containing the task number to delete
+     * @param tasks the array of tasks
+     */
     public static void dealWithDelete (String[] inputs, String ListIndex, ArrayList<Task> tasks){
         if (inputs[0].equals("delete")) {
             int idx = Integer.parseInt(ListIndex);
diff --git a/src/main/java/Todo.java b/src/main/java/Todo.java
index 3e9d6ee7a..d50a314bc 100644
--- a/src/main/java/Todo.java
+++ b/src/main/java/Todo.java
@@ -1,3 +1,6 @@
+/**
+ * child class of Task to handle todos
+ */
 public class Todo extends Task{
 
     public Todo(String description){
diff --git a/src/main/java/Ui.java b/src/main/java/Ui.java
index bf962a771..4788dddc8 100644
--- a/src/main/java/Ui.java
+++ b/src/main/java/Ui.java
@@ -1,4 +1,6 @@
-import java.io.FileNotFoundException;
+/**
+ * deals with interactions with the user
+ */
 
 public class Ui {
     public void sayHi(){

From 67523069e7e900a480f85ee888d4182cbdee5c0a Mon Sep 17 00:00:00 2001
From: hongyijie06 <hongyijie06@gmail.com>
Date: Fri, 8 Mar 2024 02:28:14 +0800
Subject: [PATCH 23/28] Add user guide

---
 README.md | 159 +++++++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 135 insertions(+), 24 deletions(-)

diff --git a/README.md b/README.md
index 8715d4d91..75e6cf898 100644
--- a/README.md
+++ b/README.md
@@ -1,24 +1,135 @@
-# Duke project template
-
-This is a project template for a greenfield Java project. It's named after the Java mascot _Duke_. Given below are instructions on how to use it.
-
-## Setting up in Intellij
-
-Prerequisites: JDK 11, update Intellij to the most recent version.
-
-1. Open Intellij (if you are not in the welcome screen, click `File` > `Close Project` to close the existing project first)
-1. Open the project into Intellij as follows:
-   1. Click `Open`.
-   1. Select the project directory, and click `OK`.
-   1. If there are any further prompts, accept the defaults.
-1. Configure the project to use **JDK 11** (not other versions) as explained in [here](https://www.jetbrains.com/help/idea/sdk.html#set-up-jdk).<br>
-   In the same dialog, set the **Project language level** field to the `SDK default` option.
-3. After that, locate the `src/main/java/Duke.java` file, right-click it, and choose `Run Duke.main()` (if the code editor is showing compile errors, try restarting the IDE). If the setup is correct, you should see something like the below as the output:
-   ```
-   Hello from
-    ____        _        
-   |  _ \ _   _| | _____ 
-   | | | | | | | |/ / _ \
-   | |_| | |_| |   <  __/
-   |____/ \__,_|_|\_\___|
-   ```
+#User Guide for chatbot "Apple"
+
+Chatbot Apple is an app to manage tasks, optimised for use through a Command Line Interface (CLI).
+
+##Quick Start
+1. Ensure Java 11 or above is installed in your computer
+2. Download `ip.jar` from [here](https://github.com/hongyijie06/ip/releases/tag/A-Jar)
+3. Open a command terminal, `cd` into the folder with the jar file and use the `java -jar ip.jar` command to run the application.
+
+A CLI similar to the picture below should appear in a few seconds. Note how the app returns the path to which the list of tasks is saved on the local computer.
+
+[picture](/initialSetup.png)
+
+4. Type the command into the command line and press Enter to execute it. e.g. typing list and pressing Enter will list the current tasks.
+Some example commands you can try:
+
+- `todo tutorial`: Adds task "tutorial" to the list
+- `deadline return book by 4pm`: Adds task "return book" nd deadline "4pm" to the list
+- `list`: Lists all tasks
+- `bye`: Exits the app
+
+5. Refer to the Features below for more details on each command.
+
+##Features
+
+[!NOTE]
+> Words in `UPPER_CASE` are parameters to be supplied by the user. e.g. in `delete INDEX`, `INDEX` is a parameter which can be used as `delete 3`
+
+##Listing tasks: `list`
+Lists all tasks in the task list.
+
+Format: `list`
+
+[picture1](/List.png)
+
+##Add tasks
+###Add todo : `todo`
+Adds task of type todo to the list of tasks
+
+Format: `todo DESCRIPTION`
+
+Examples:
+- `todo tutorial` Adds task `tutorial` to the list of tasks
+- `todo watch lecture` Adds task `watch lecture` to the list of tasks
+
+ADD PIC HERE
+
+###Add deadline: `deadline`
+Adds task of type deadline to the list of tasks
+
+Format: `deadline DESCRIPTION by DEADLINE`
+
+Examples:
+- `deadline return book by 4pm` Adds task `return book` with deadline `4pm` to the list of tasks
+- `deadline submit report by 7pm` Adds task `submit report` with deadline `7pm` to the list of tasks
+
+ADD PIC HERE
+
+##Add event: `event`
+Adds task of type event to the list of tasks
+
+Format: `event DESCRIPTION from START to END`
+
+Examples:
+- `event Math exam from 2pm to 4pm` Adds task `Math exam` with timeline `2pm` to `4pm` to the list of tasks
+- `event project group meeting from 11am to 1pm` Adds task `project group meeting` with timeline `11am` to `1pm` to the list of tasks
+
+ADD PIC HERE
+
+##Delete tasks: `delete`
+Deletes task from the list of tasks
+
+Format: `delete INDEX`
+
+- Deletes task at the specified `INDEX`. 
+- The index refers to the index of the task in the list of tasks. 
+- The index must be a positive integer.
+
+Examples:
+- `delete 3` Deletes third task in the list
+- `delete 5` Deletes fifth task in the list
+
+##Mark tasks as done: `mark`
+Marks tasks as completed
+
+Format: `mark INDEX`
+
+- Marks task as done at the specified `INDEX`. 
+- The index refers to the index of the task in the list of tasks. 
+- The index must be a positive integer.
+
+Examples: 
+- `mark 1` Marks first task in the list as done
+- `mark 6` Marks sixth task in the list as done
+
+##Unmark tasks: `unmark`
+Marks tasks as undone
+
+Format: `unmark INDEX`
+
+- Marks task as not done at the specified `INDEX`. 
+- The index refers to the index of the task in the list of tasks. 
+- The index must be a positive integer.
+
+Examples:
+- `unmark 1` Marks first task in the list as notdone
+- `unmark 2` Marks second task in the list as not done
+
+##Find Keywords: `find`
+Filters list of tasks to those containing the keyword the user wants to find
+
+Format: `find KEYWORD`
+
+Examples:
+- `find book` CLI returns a list with all the tasks with the `KEYWORD` `book`.
+- `find tutorial` CLI returns a list with all the tasks with the `KEYWORD` `tutorial`.
+
+##Exit app: `bye`
+Exits the chatbot
+
+Format: `bye`
+
+##Command Summary
+
+| Command | Format,Examples |
+| ------- | --------------- |
+| `list` | `list` |
+| `todo` | `todo DESCRIPTION` e.g. `todo tutorial` |
+| `deadline` | `deadline DESCRIPTION by DEADLINE` e.g. `deadline return book by 4pm` |
+| `event` | `event DESCRIPTION from START to END` e.g. event Math exam from 2pm to 4pm` |
+| `delete` | `delete INDEX` e.g. `delete 3` |
+| `mark` | `mark INDEX` e.g. `mark 2` |
+| `unmark` | `unmark INDEX` e.g. `unmark 1` |
+| `find` | `find KEYWORD` e.g. `find book` |
+| `bye` | `bye` |
\ No newline at end of file

From 2f4b48118b711f55779b87e2434b8efc14275d96 Mon Sep 17 00:00:00 2001
From: hongyijie06 <hongyijie06@gmail.com>
Date: Fri, 8 Mar 2024 02:33:14 +0800
Subject: [PATCH 24/28] Format headers

---
 README.md | 30 +++++++++++++-----------------
 1 file changed, 13 insertions(+), 17 deletions(-)

diff --git a/README.md b/README.md
index 75e6cf898..0e8e4c0f3 100644
--- a/README.md
+++ b/README.md
@@ -1,16 +1,14 @@
-#User Guide for chatbot "Apple"
+# User Guide for chatbot "Apple"
 
 Chatbot Apple is an app to manage tasks, optimised for use through a Command Line Interface (CLI).
 
-##Quick Start
+## Quick Start
 1. Ensure Java 11 or above is installed in your computer
 2. Download `ip.jar` from [here](https://github.com/hongyijie06/ip/releases/tag/A-Jar)
 3. Open a command terminal, `cd` into the folder with the jar file and use the `java -jar ip.jar` command to run the application.
 
 A CLI similar to the picture below should appear in a few seconds. Note how the app returns the path to which the list of tasks is saved on the local computer.
 
-[picture](/initialSetup.png)
-
 4. Type the command into the command line and press Enter to execute it. e.g. typing list and pressing Enter will list the current tasks.
 Some example commands you can try:
 
@@ -21,7 +19,7 @@ Some example commands you can try:
 
 5. Refer to the Features below for more details on each command.
 
-##Features
+## Features
 
 [!NOTE]
 > Words in `UPPER_CASE` are parameters to be supplied by the user. e.g. in `delete INDEX`, `INDEX` is a parameter which can be used as `delete 3`
@@ -31,10 +29,8 @@ Lists all tasks in the task list.
 
 Format: `list`
 
-[picture1](/List.png)
-
-##Add tasks
-###Add todo : `todo`
+## Add tasks
+### Add todo : `todo`
 Adds task of type todo to the list of tasks
 
 Format: `todo DESCRIPTION`
@@ -45,7 +41,7 @@ Examples:
 
 ADD PIC HERE
 
-###Add deadline: `deadline`
+### Add deadline: `deadline`
 Adds task of type deadline to the list of tasks
 
 Format: `deadline DESCRIPTION by DEADLINE`
@@ -56,7 +52,7 @@ Examples:
 
 ADD PIC HERE
 
-##Add event: `event`
+### Add event: `event`
 Adds task of type event to the list of tasks
 
 Format: `event DESCRIPTION from START to END`
@@ -67,7 +63,7 @@ Examples:
 
 ADD PIC HERE
 
-##Delete tasks: `delete`
+## Delete tasks: `delete`
 Deletes task from the list of tasks
 
 Format: `delete INDEX`
@@ -80,7 +76,7 @@ Examples:
 - `delete 3` Deletes third task in the list
 - `delete 5` Deletes fifth task in the list
 
-##Mark tasks as done: `mark`
+## Mark tasks as done: `mark`
 Marks tasks as completed
 
 Format: `mark INDEX`
@@ -93,7 +89,7 @@ Examples:
 - `mark 1` Marks first task in the list as done
 - `mark 6` Marks sixth task in the list as done
 
-##Unmark tasks: `unmark`
+## Unmark tasks: `unmark`
 Marks tasks as undone
 
 Format: `unmark INDEX`
@@ -106,7 +102,7 @@ Examples:
 - `unmark 1` Marks first task in the list as notdone
 - `unmark 2` Marks second task in the list as not done
 
-##Find Keywords: `find`
+## Find Keywords: `find`
 Filters list of tasks to those containing the keyword the user wants to find
 
 Format: `find KEYWORD`
@@ -115,12 +111,12 @@ Examples:
 - `find book` CLI returns a list with all the tasks with the `KEYWORD` `book`.
 - `find tutorial` CLI returns a list with all the tasks with the `KEYWORD` `tutorial`.
 
-##Exit app: `bye`
+## Exit app: `bye`
 Exits the chatbot
 
 Format: `bye`
 
-##Command Summary
+## Command Summary
 
 | Command | Format,Examples |
 | ------- | --------------- |

From 4f03af2ddd781c95bf5b2346545493980c7b5777 Mon Sep 17 00:00:00 2001
From: hongyijie06 <hongyijie06@gmail.com>
Date: Fri, 8 Mar 2024 20:33:18 +0800
Subject: [PATCH 25/28] follow coding standards

---
 README.md                                     |   6 +-
 src/main/java/CreateFile.java                 |  24 ++--
 src/main/java/Deadline.java                   |   2 +-
 src/main/java/Duke.java                       |  31 +++--
 src/main/java/EmptyLineException.java         |   3 +-
 src/main/java/Event.java                      |   4 +-
 src/main/java/Parser.java                     | 102 ++++++++--------
 src/main/java/ReadFileContents.java           |  19 +--
 src/main/java/Storage.java                    |  18 ++-
 src/main/java/TaskList.java                   | 114 +++++++++++-------
 src/main/java/Todo.java                       |   4 +-
 src/main/java/Ui.java                         |   8 +-
 src/main/java/UnexpectedCommandException.java |   1 +
 13 files changed, 192 insertions(+), 144 deletions(-)

diff --git a/README.md b/README.md
index 0e8e4c0f3..db4a5e14b 100644
--- a/README.md
+++ b/README.md
@@ -24,7 +24,7 @@ Some example commands you can try:
 [!NOTE]
 > Words in `UPPER_CASE` are parameters to be supplied by the user. e.g. in `delete INDEX`, `INDEX` is a parameter which can be used as `delete 3`
 
-##Listing tasks: `list`
+## Listing tasks: `list`
 Lists all tasks in the task list.
 
 Format: `list`
@@ -118,12 +118,12 @@ Format: `bye`
 
 ## Command Summary
 
-| Command | Format,Examples |
+| Command | Format, Examples |
 | ------- | --------------- |
 | `list` | `list` |
 | `todo` | `todo DESCRIPTION` e.g. `todo tutorial` |
 | `deadline` | `deadline DESCRIPTION by DEADLINE` e.g. `deadline return book by 4pm` |
-| `event` | `event DESCRIPTION from START to END` e.g. event Math exam from 2pm to 4pm` |
+| `event` | `event DESCRIPTION from START to END` e.g. `event Math exam from 2pm to 4pm` |
 | `delete` | `delete INDEX` e.g. `delete 3` |
 | `mark` | `mark INDEX` e.g. `mark 2` |
 | `unmark` | `unmark INDEX` e.g. `unmark 1` |
diff --git a/src/main/java/CreateFile.java b/src/main/java/CreateFile.java
index b977750c6..8162aba93 100644
--- a/src/main/java/CreateFile.java
+++ b/src/main/java/CreateFile.java
@@ -5,21 +5,29 @@
  * creates local TaskList.txt file on the local machine
  */
 public class CreateFile {
-    public static void CreateFile(){
-        File f = new File("TaskList.txt");
-        if (!f.exists()) {
+    protected static Ui ui;
+    public static void CreateFile() {
+        File file = new File("TaskList.txt");
+        String errorDescription;
+        String fileStatus;
+
+        if (!file.exists()) {
             try {
-                if (f.createNewFile()) {
-                    System.out.println("File created: " + f.getAbsolutePath());
+                if (file.createNewFile()) {
+                    fileStatus = "File created";
+                    System.out.println(fileStatus + ": " + file.getAbsolutePath());
                 } else {
-                    System.out.println("File creation failed.");
+                    errorDescription = "File creation failed.";
+                    ui.errorMessage(errorDescription);
                 }
             } catch (IOException e) {
-                System.out.println("An error occurred.");
+                errorDescription = "An I/O error occurred.";
+                ui.errorMessage(errorDescription);
                 e.printStackTrace();
             }
         } else {
-            System.out.println("File already exists: " + f.getAbsolutePath());
+            fileStatus = "File already exists";
+            System.out.println(fileStatus + ": " + file.getAbsolutePath());
         }
     }
 }
diff --git a/src/main/java/Deadline.java b/src/main/java/Deadline.java
index 941068471..c85aa1cf8 100644
--- a/src/main/java/Deadline.java
+++ b/src/main/java/Deadline.java
@@ -1,7 +1,7 @@
 /**
  * child class of Task to handle deadlines
  */
-public class Deadline extends Task{
+public class Deadline extends Task {
     protected String by;
 
     public Deadline(String description, String by) {
diff --git a/src/main/java/Duke.java b/src/main/java/Duke.java
index 8cebfc61e..df9a9300c 100644
--- a/src/main/java/Duke.java
+++ b/src/main/java/Duke.java
@@ -12,7 +12,7 @@ public class Duke {
      * @param filePath the path to the local TaskList.txt file
      * @throws FileNotFoundException exception when local TaskList.txt file does not exist
      */
-    private static void printFileContents(String filePath) throws FileNotFoundException {
+    private static void printFileContents (String filePath) throws FileNotFoundException {
         File f = new File(filePath); // create a File for the given file path
         Scanner s = new Scanner(f); // create a Scanner using the File as the source
         while (s.hasNext()) {
@@ -21,33 +21,38 @@ private static void printFileContents(String filePath) throws FileNotFoundExcept
     }
 
     private static Ui ui;
-    public static void main(String[] args) throws UnexpectedCommandException, EmptyLineException, IOException, FileNotFoundException {
+    public static void main (String[] args) throws UnexpectedCommandException, EmptyLineException, IOException, FileNotFoundException {
         ArrayList<Task> tasks = new ArrayList<Task>();
+        String errorDescription;
+        int index = 0;//number of items in the list
+        String line = " ";
+        File file = new File("TaskList.txt");
+
         ui = new Ui();
         ui.sayHi();
         try {
             System.out.println("Here are the items in your task list: ");
             printFileContents("TaskList.txt");
-
         } catch (FileNotFoundException e) {
-            System.out.println("File not found");
+            errorDescription = "File not found";
+            ui.errorMessage(errorDescription);
         }
-        int index = 0;//number of items in the list
-        String line = " ";
-        File f = new File("TaskList.txt");
-        if (!f.exists()) {
+
+        if (!file.exists()) {
             try {
-                if (f.createNewFile()) {
-                    System.out.println("File created: " + f.getAbsolutePath());
+                if (file.createNewFile()) {
+                    System.out.println("File created: " + file.getAbsolutePath());
                 } else {
-                    System.out.println("File creation failed.");
+                    errorDescription = "File creation failed.";
+                    ui.errorMessage(errorDescription);
                 }
             } catch (IOException e) {
-                System.out.println("An error occurred.");
+                errorDescription = "An I/O error occurred.";
+                ui.errorMessage(errorDescription);
                 e.printStackTrace();
             }
         } else {
-            System.out.println("File already exists: " + f.getAbsolutePath());
+            System.out.println("File already exists: " + file.getAbsolutePath());
         }
 
         new Parser(tasks, index, line);
diff --git a/src/main/java/EmptyLineException.java b/src/main/java/EmptyLineException.java
index fd35912c9..5348ca427 100644
--- a/src/main/java/EmptyLineException.java
+++ b/src/main/java/EmptyLineException.java
@@ -1,2 +1,3 @@
-public class EmptyLineException extends Exception{
+public class EmptyLineException extends Exception {
+
 }
diff --git a/src/main/java/Event.java b/src/main/java/Event.java
index d61530a83..7c94810a5 100644
--- a/src/main/java/Event.java
+++ b/src/main/java/Event.java
@@ -1,14 +1,16 @@
 /**
  * child class of Task to handle events
  */
-public class Event extends Task{
+public class Event extends Task {
     protected String from;
     protected String to;
+
     public Event(String description, String from, String to){
         super(description);
         this.from = from;
         this.to = to;
     }
+
     @Override
     public String toString() {
         return "[E]" + super.toString() + " (from: " + from + " to: " + to + ")";
diff --git a/src/main/java/Parser.java b/src/main/java/Parser.java
index c3465ff7a..fe92bb35b 100644
--- a/src/main/java/Parser.java
+++ b/src/main/java/Parser.java
@@ -6,36 +6,32 @@
  * deals with making sense of the user command
  */
 public class Parser {
-    protected static String from;
-    protected static String to;
-    public static String description;
-    protected static String by;
     private static Ui ui;
     private static Storage storage;
     private static TaskList tasklist;
 
-    public String findInput;
-
     /**
      * marks task as done
      * @param inputs the array of words the user input
      * @param tasks the array of tasks
      * @param index the number of tasks in the array of tasks
      * @param isValidCommand boolean is true if the command from the user is a valid action
-     * @throws IOException exception when local TaskList.txt file does not exist
+     * @throws IOException exception when there is an I/O error
      */
-    private void dealWithMark(String[] inputs, ArrayList<Task> tasks, int index, boolean isValidCommand) throws IOException {
+    private void dealWithMark (String[] inputs, ArrayList<Task> tasks, int index, boolean isValidCommand) throws IOException {
         isValidCommand = true;
+        String errorDescription;
+
         try {
-            int idx = Integer.parseInt(inputs[1]);
-            tasks.get(idx - 1).markAsDone();
+            int markIdx = Integer.parseInt(inputs[1]) - 1; //index to mark as done
+            tasks.get(markIdx).markAsDone();
             System.out.println("Nice! I've marked this task as done: ");
-            System.out.println(tasks.get(idx - 1));
+            System.out.println(tasks.get(markIdx));
             storage.saveToFile(tasks, index);
-        } catch (IndexOutOfBoundsException e){
-            ui.errorMessage("did not indicate which task to mark");
+        } catch (IndexOutOfBoundsException e) {
+            errorDescription = "did not indicate which task to mark";
+            ui.errorMessage(errorDescription);
         }
-
     }
 
     /**
@@ -44,18 +40,21 @@ private void dealWithMark(String[] inputs, ArrayList<Task> tasks, int index, boo
      * @param tasks the array of tasks
      * @param index the number of tasks in the array of tasks
      * @param isValidCommand boolean is true if the command from the user is a valid action
-     * @throws IOException exception when local TaskList.txt file does not exist
+     * @throws IOException exception when there is an I/O error
      */
-    private void dealWithUnmark(String[] inputs, ArrayList<Task> tasks, int index, boolean isValidCommand) throws IOException {
+    private void dealWithUnmark (String[] inputs, ArrayList<Task> tasks, int index, boolean isValidCommand) throws IOException {
         isValidCommand = true;
+        String errorDescription;
+
         try {
-            int idx = Integer.parseInt(inputs[1]);
-            tasks.get(idx - 1).unmarkDone();
+            int unmarkIdx = Integer.parseInt(inputs[1]) - 1; //index of task to unmark
+            tasks.get(unmarkIdx).unmarkDone();
             System.out.println("OK, I've marked this task as not done yet: ");
-            System.out.println(tasks.get(idx - 1));
+            System.out.println(tasks.get(unmarkIdx));
             storage.saveToFile(tasks, index);
-        } catch (IndexOutOfBoundsException e){
-            ui.errorMessage("did not indicate which task to unmark");
+        } catch (IndexOutOfBoundsException e) {
+            errorDescription = "did not indicate which task to unmark";
+            ui.errorMessage(errorDescription);
         }
     }
 
@@ -65,12 +64,12 @@ private void dealWithUnmark(String[] inputs, ArrayList<Task> tasks, int index, b
      * @param index the number of tasks in the array of tasks
      * @param isValidCommand boolean is true if the command from the user is a valid action
      */
-    private void listTasks(ArrayList<Task> tasks, int index, boolean isValidCommand){
+    private void listTasks (ArrayList<Task> tasks, int index, boolean isValidCommand) {
         isValidCommand = true;
         System.out.println("Here are the tasks in your list: ");
 
-        for (int i = 0; i < index; i++) {
-            System.out.println((i + 1) + ". " + tasks.get(i));
+        for (int taskNumber = 0; taskNumber < index; taskNumber++) {
+            System.out.println((taskNumber + 1) + ". " + tasks.get(taskNumber));
         }
     }
 
@@ -82,9 +81,9 @@ private void listTasks(ArrayList<Task> tasks, int index, boolean isValidCommand)
      * @param isValidCommand boolean is true if the command from the user is a valid action
      * @return the number of tasks in the array of tasks after deletion
      * @throws UnexpectedCommandException exception when the format or details of the tasks are not followed and provided respectively
-     * @throws IOException exception when local TaskList.txt file does not exist
+     * @throws IOException exception when there is an I/O error
      */
-    private int deleteTask(ArrayList<Task> tasks, String[] inputs, int index, boolean isValidCommand) throws UnexpectedCommandException, IOException {
+    private int deleteTask (ArrayList<Task> tasks, String[] inputs, int index, boolean isValidCommand) throws UnexpectedCommandException, IOException {
         isValidCommand = true;
         Storage.fillFileContents(tasks, "TaskList.txt", index);
         TaskList.dealWithDelete(inputs, inputs[1], tasks);
@@ -100,15 +99,15 @@ private int deleteTask(ArrayList<Task> tasks, String[] inputs, int index, boolea
      * @param tasks the array of tasks
      * @param index the number of tasks in the array of tasks
      */
-    private void dealWithFind(String findInput, ArrayList<Task> tasks, int index){
+    private void dealWithFind (String findInput, ArrayList<Task> tasks, int index) {
         ArrayList<Task> matchingTasks = new ArrayList<Task>();
         int matchingTasksIndex = 1;
         System.out.println("Here are the matching tasks in your list: ");
-        for (int i = 0; i < index; i ++){
-            String xline = tasks.get(i).toString();
-            if (xline.contains(findInput)){
+        for (int taskNumber = 0; taskNumber < index; taskNumber ++){
+            String taskString = tasks.get(taskNumber).toString();
+            if (taskString.contains(findInput)) {
                 System.out.print(matchingTasksIndex + ". ");
-                matchingTasks.add(tasks.get(i));
+                matchingTasks.add(tasks.get(taskNumber));
                 System.out.println(matchingTasks.get(matchingTasksIndex - 1));
                 matchingTasksIndex ++;
             }
@@ -116,13 +115,13 @@ private void dealWithFind(String findInput, ArrayList<Task> tasks, int index){
     }
 
 
-    private void handleUnexpectedCommand(boolean isValidCommand) throws UnexpectedCommandException {
+    private void handleUnexpectedCommand (boolean isValidCommand) throws UnexpectedCommandException {
         if (!isValidCommand) {
             throw new UnexpectedCommandException();
         }
     }
 
-    private void handleEmptyInput(String line) throws EmptyLineException {
+    private void handleEmptyInput (String line) throws EmptyLineException {
         if (line.isEmpty()) {
             throw new EmptyLineException();
         }
@@ -133,15 +132,16 @@ private void handleEmptyInput(String line) throws EmptyLineException {
      * @param tasks the array of tasks
      * @param index the number of tasks in the array of tasks
      * @param line the user input
-     * @throws IOException exception when local TaskList.txt file does not exist
+     * @throws IOException exception when there is an I/O error
      * @throws IndexOutOfBoundsException exception when there is missing required details in the input
      * @throws UnexpectedCommandException exception when the format or details of the tasks are not followed and provided respectively
      */
-    public Parser(ArrayList<Task> tasks, int index, String line) throws IOException, IndexOutOfBoundsException, UnexpectedCommandException {
+    public Parser (ArrayList<Task> tasks, int index, String line) throws IOException, IndexOutOfBoundsException, UnexpectedCommandException {
         boolean isInTxt = true;
         index = Storage.fillFileContents(tasks, "TaskList.txt", index);
         isInTxt = false;
         ui = new Ui();
+        String errorDescription;
 
         while (!line.equals("bye")) {
             ui.readCommand();
@@ -151,11 +151,13 @@ public Parser(ArrayList<Task> tasks, int index, String line) throws IOException,
 
             Task t = new Task(line);
             String[] inputs = line.split(" ");
+
+            final String commandType = inputs[0];
             
-            if (inputs[0].equals("mark")) {//mark as done
+            if (commandType.equals("mark")) {//mark as done
                 dealWithMark(inputs, tasks, index, isValidCommand);
                 Storage.saveToFile(tasks, index);
-            } else if (inputs[0].equals("unmark")) {//unmark done
+            } else if (commandType.equals("unmark")) {//unmark done
                 dealWithUnmark(inputs, tasks, index, isValidCommand);
                 Storage.saveToFile(tasks, index);
             } else if (line.equals("list")) {//lists tasks
@@ -164,16 +166,16 @@ public Parser(ArrayList<Task> tasks, int index, String line) throws IOException,
                 isValidCommand = true;
                 Storage.saveToFile(tasks, index);
                 break;
-            } else if (inputs[0].equals("event") || inputs[0].equals("todo") || inputs[0].equals("deadline")) {//add items
+            } else if (commandType.equals("event") || commandType.equals("todo") || commandType.equals("deadline")) {//add items
                 try {
-                    if (inputs[0].equals("event")) {
+                    if (commandType.equals("event")) {
                         isValidCommand = true;
                         TaskList.dealWithEvent(tasks, index, line, isInTxt);
                         Storage.writeToFile("TaskList.txt", tasks.get(index));
                         System.out.println("Got it. I've added this task: ");
                         System.out.println(tasks.get(index));
                         index++;
-                    } else if (inputs[0].equals("deadline")) {
+                    } else if (commandType.equals("deadline")) {
                         isValidCommand = true;
                         TaskList.dealWithDeadline(tasks, index, line, isInTxt);
                         Storage.writeToFile("TaskList.txt", tasks.get(index));
@@ -192,26 +194,30 @@ public Parser(ArrayList<Task> tasks, int index, String line) throws IOException,
                 }
                 System.out.println("Now you have " + index + " tasks in the list.");
 
-            } else if (inputs[0].equals("delete")) {
+            } else if (commandType.equals("delete")) {
                 try {
                     index = deleteTask(tasks, inputs, index, isValidCommand);
-                } catch (ArrayIndexOutOfBoundsException e){
-                    System.out.println("please specify which task you want to delete");
+                } catch (ArrayIndexOutOfBoundsException e) {
+                    errorDescription = "please specify which task you want to delete";
+                    ui.errorMessage(errorDescription);
                 }
-            } else if (inputs[0].equals("find")){
+            } else if (commandType.equals("find")) {
                 try {
                     dealWithFind(inputs[1], tasks, index);
-                } catch (ArrayIndexOutOfBoundsException e){
-                    System.out.println("please state what you would like to find");
+                } catch (ArrayIndexOutOfBoundsException e) {
+                    errorDescription = "please state what you would like to find";
+                    ui.errorMessage(errorDescription);
                 }
             } else {
                 try {
                     handleEmptyInput(line);
                     handleUnexpectedCommand(isValidCommand);
                 } catch (UnexpectedCommandException e) {
-                    ui.errorMessage("Please enter a valid command");
+                    errorDescription = "Please enter a valid command";
+                    ui.errorMessage(errorDescription);
                 } catch (EmptyLineException e) {
-                    ui.errorMessage("No input detected. Please enter a task");
+                    errorDescription = "No input detected. Please enter a task";
+                    ui.errorMessage(errorDescription);
                 }
             }
         }
diff --git a/src/main/java/ReadFileContents.java b/src/main/java/ReadFileContents.java
index 9f914cc71..0a797b2c7 100644
--- a/src/main/java/ReadFileContents.java
+++ b/src/main/java/ReadFileContents.java
@@ -2,24 +2,27 @@
 import java.io.FileNotFoundException;
 import java.util.Scanner;
 
+/**
+ * prints TaskList.txt file contents
+ */
 public class ReadFileContents {
+    private static Ui ui;
 
-    private static void printFileContents(String filePath) throws FileNotFoundException {
-        File f = new File(filePath); // create a File for the given file path
-        Scanner s = new Scanner(f); // create a Scanner using the File as the source
-        while (s.hasNext()) {
-            System.out.println(s.nextLine());
+    private static void printFileContents (String filePath) throws FileNotFoundException {
+        File file = new File(filePath);
+        Scanner taskString = new Scanner(file); //reads tasks from TaskList.txt file
+        while (taskString.hasNext()) {
+            System.out.println(taskString.nextLine());
         }
     }
 
     public static void main(String[] args) {
         try {
             printFileContents("TaskList.txt");
-
         } catch (FileNotFoundException e) {
             new CreateFile();
-            System.out.println("File not found");
+            String errorDescription = "File not found";
+            ui.errorMessage(errorDescription);
         }
     }
-
 }
\ No newline at end of file
diff --git a/src/main/java/Storage.java b/src/main/java/Storage.java
index 6897d87ae..e40b26e1e 100644
--- a/src/main/java/Storage.java
+++ b/src/main/java/Storage.java
@@ -17,13 +17,12 @@ public class Storage {
      * @throws IOException exception when local TaskList.txt file does not exist
      * @throws UnexpectedCommandException exception when the format or details of the tasks are not followed and provided respectively
      */
-    public static int fillFileContents(ArrayList<Task> tasks, String filePath, int index) throws IOException, UnexpectedCommandException {//updates index
+    public static int fillFileContents (ArrayList<Task> tasks, String filePath, int index) throws IOException, UnexpectedCommandException {//updates index
         File f = new File(filePath); // create a File for the given file path
-        Scanner s = new Scanner(f); // create a Scanner using the File as the source
+        Scanner taskLine = new Scanner(f); // create a Scanner using the File as the source
 
-        while (s.hasNext()) {
-
-            String sLine = s.nextLine();
+        while (taskLine.hasNext()) {
+            String sLine = taskLine.nextLine();
 
             if (sLine.contains("[E]")) {
                 TaskList.dealWithEvent(tasks, index, sLine, true);
@@ -32,7 +31,6 @@ public static int fillFileContents(ArrayList<Task> tasks, String filePath, int i
             } else if (sLine.contains("[T]")) {
                 TaskList.dealWithTodo(tasks, index, sLine, true);
             }
-
             index++;
         }
         boolean isInTxt = false;
@@ -43,9 +41,9 @@ public static int fillFileContents(ArrayList<Task> tasks, String filePath, int i
      * saves the updated tasks list onto TaskList.txt in the local machine
      * @param tasks the array of tasks
      * @param index the nymber of tasks in array of tasks
-     * @throws IOException exception when local TaskList.txt file does not exist
+     * @throws IOException exception when there is an I/O error
      */
-    protected static void saveToFile(ArrayList<Task> tasks, int index) throws IOException{
+    protected static void saveToFile (ArrayList<Task> tasks, int index) throws IOException {
         new FileWriter("TaskList.txt", false).close();
         for (int TaskIndex = 0; TaskIndex < index; TaskIndex ++) {
             writeToFile("TaskList.txt", tasks.get(TaskIndex));
@@ -56,9 +54,9 @@ protected static void saveToFile(ArrayList<Task> tasks, int index) throws IOExce
      * adds additional tasks into TaskList.txt
      * @param filePath the path to TaskList.txt saved on the local machine
      * @param textToAdd the new task to add
-     * @throws IOException exception when local TaskList.txt file does not exist
+     * @throws IOException exception when there is an I/O error
      */
-    static void writeToFile(String filePath, Task textToAdd) throws IOException{
+    static void writeToFile (String filePath, Task textToAdd) throws IOException {
         FileWriter fw = new FileWriter(filePath, true);
         fw.write(textToAdd + "\n");
         fw.close();
diff --git a/src/main/java/TaskList.java b/src/main/java/TaskList.java
index 45ffe4f05..398f411e6 100644
--- a/src/main/java/TaskList.java
+++ b/src/main/java/TaskList.java
@@ -18,54 +18,65 @@ public TaskList(){
      * @param line the input string from the user
      * @param isInTxt true if ArrayList<Task> tasks is being loaded from TaskList.txt
      * @throws UnexpectedCommandException exception when the format or details of the tasks are not followed and provided respectively
-     * @throws IOException exception when local TaskList.txt file does not exist
+     * @throws IOException exception when there is an I/O error
      */
-    public static void dealWithEvent(ArrayList<Task> tasks, int index, String line, boolean isInTxt) throws UnexpectedCommandException, IOException {
+    public static void dealWithEvent (ArrayList<Task> tasks, int index, String line, boolean isInTxt) throws UnexpectedCommandException, IOException {
         int indexTo = line.lastIndexOf("to");
         int indexFrom = line.indexOf("from");
         String from;
         String to;
         String description;
+        String errorDescription;
+        
+        final int LENGTHOFFROM = 5; //length of "from "
+        final int LENGTHOFTO = 3;
+        final int EVENTCOMMANDLENGTH = 6;//length of "event "
+
+        final int FROMLENGTHCOLON = 6;//length of "from: "
+        final int TOLENGTHCOLON = 4;
+        final int STATUSLENGTH = 5;//length of "[E][ ]"
 
         if ((indexTo == -1) || (indexFrom == -1)) { //invalid format
-            ui.errorMessage("Invalid format! Enter event in the format: event (description) from (start) to (end)");
+            errorDescription = "Invalid format! Enter event in the format: event (description) from (start) to (end)";
+            ui.errorMessage(errorDescription);
             throw new UnexpectedCommandException();
         }
         try {//timeline not specified/ both not specified
-            from = line.substring(indexFrom + 5, indexTo - 1);
-            to = line.substring(indexTo + 3);
+            from = line.substring(indexFrom + LENGTHOFFROM, indexTo - 1);
+            to = line.substring(indexTo + LENGTHOFTO);
         } catch (IndexOutOfBoundsException e) {
             try {
-                description = line.substring(6, indexFrom - 1);
+                description = line.substring(EVENTCOMMANDLENGTH, indexFrom - 1);
             } catch (IndexOutOfBoundsException f) {
-                ui.errorMessage("event description and timeline not specified");
+                errorDescription = "event description and timeline not specified";
+                ui.errorMessage(errorDescription);
                 throw new UnexpectedCommandException();
             }
-            ui.errorMessage("event timeline not specified");
+            errorDescription = "event timeline not specified";
+            ui.errorMessage(errorDescription);
             throw new UnexpectedCommandException();
         }
         try {//description not specified
-            description = line.substring(6, indexFrom - 1);
+            description = line.substring(EVENTCOMMANDLENGTH, indexFrom - 1);
         } catch (IndexOutOfBoundsException e) {
-            ui.errorMessage("event description not specified");
+            errorDescription = "event description not specified";
+            ui.errorMessage(errorDescription);
             throw new UnexpectedCommandException();
         }
-        if(!isInTxt) {
-            from = line.substring(indexFrom + 5, indexTo - 1);
-            to = line.substring(indexTo + 3);
-            description = line.substring(5, indexFrom - 1);
+        if (!isInTxt) {
+            from = line.substring(indexFrom + LENGTHOFFROM, indexTo - 1);
+            to = line.substring(indexTo + LENGTHOFTO);
+            description = line.substring(STATUSLENGTH, indexFrom - 1);
         } else {
-
-            from = line.substring(indexFrom + 6, indexTo - 1);
-            to = line.substring(indexTo + 4, line.length() - 1);
-            description = line.substring(6, indexFrom - 1);
-
-
+            from = line.substring(indexFrom + FROMLENGTHCOLON, indexTo - 1);
+            to = line.substring(indexTo + TOLENGTHCOLON, line.length() - 1);
+            description = line.substring(EVENTCOMMANDLENGTH, indexFrom - 1);
         }
         tasks.add(index, new Event(description, from, to));
+        final int STATUSINDEX = 4;
         if (isInTxt){
             char[] charArray = line.toCharArray();
-            if (charArray[4] == '1'){
+            if (charArray[STATUSINDEX] == '1'){
                 tasks.get(index).markAsDone();
             } else{
                 tasks.get(index).unmarkDone();
@@ -80,49 +91,59 @@ public static void dealWithEvent(ArrayList<Task> tasks, int index, String line,
      * @param line the input string from the user
      * @param isInTxt true if ArrayList<Task> tasks is being loaded from TaskList.txt
      * @throws UnexpectedCommandException exception when the format or details of the tasks are not followed and provided respectively
-     * @throws IOException exception when local TaskList.txt file does not exist
+     * @throws IOException exception when there is an I/O error
      */
-    public static void dealWithDeadline(ArrayList<Task> tasks, int index, String line, boolean isInTxt) throws UnexpectedCommandException, IOException {
+    public static void dealWithDeadline (ArrayList<Task> tasks, int index, String line, boolean isInTxt) throws UnexpectedCommandException, IOException {
         int indexBy = line.indexOf("by");
         int space = line.indexOf(" ");
         String by;
         String description;
+        String errorDescription;
+
+        final int LENGTHFBY = 3;//length of "by "
+        final int BYLENGTHCOLON = 4; //length of "by: "
+
         if (indexBy == -1) {//invalid format
-            ui.errorMessage("Invalid format! Enter deadline in the format: deadline (description) by (deadline)");
+            errorDescription = "Invalid format! Enter deadline in the format: deadline (description) by (deadline)";
+            ui.errorMessage(errorDescription);
             throw new UnexpectedCommandException();
         }
         try {//deadline / both not specified
-            by = line.substring(indexBy + 3);
+            by = line.substring(indexBy + LENGTHFBY);
         } catch (IndexOutOfBoundsException e) {
             try {
                 description = line.substring(space + 1, indexBy - 1);
             } catch (IndexOutOfBoundsException f) {
-                ui.errorMessage("deadline description and deadline not specified");
+                errorDescription = "deadline description and deadline not specified";
+                ui.errorMessage(errorDescription);
                 throw new UnexpectedCommandException();
             }
-            ui.errorMessage("deadline not specified");
+            errorDescription = "deadline not specified";
+            ui.errorMessage(errorDescription);
             throw new UnexpectedCommandException();
         }
         try {//deadline not specified
             description = line.substring(space + 1, indexBy - 1);
         } catch (IndexOutOfBoundsException e) {
-            ui.errorMessage("deadline description not specified");
+            errorDescription = "deadline description not specified";
+            ui.errorMessage(errorDescription);
             throw new UnexpectedCommandException();
         }
         if (!isInTxt) {
             description = line.substring(space, indexBy - 1);
-            by = line.substring(indexBy + 3);
-        } else{
+            by = line.substring(indexBy + LENGTHFBY);
+        } else {
             description = line.substring(space, indexBy - 1);
-            by = line.substring(indexBy + 4, line.length() - 1);
+            by = line.substring(indexBy + BYLENGTHCOLON, line.length() - 1);
         }
 
         tasks.add(index, new Deadline(description, by));
-        if (isInTxt){
+        if (isInTxt) {
+            final int STATUSINDEX = 4;
             char[] charArray = line.toCharArray();
-            if (charArray[4] == '1'){
+            if (charArray[STATUSINDEX] == '1'){
                 tasks.get(index).markAsDone();
-            } else{
+            } else {
                 tasks.get(index).unmarkDone();
             }
         }
@@ -135,26 +156,29 @@ public static void dealWithDeadline(ArrayList<Task> tasks, int index, String lin
      * @param line the input string from the user
      * @param isInTxt true if ArrayList<Task> tasks is being loaded from TaskList.txt
      * @throws UnexpectedCommandException exception when the format or details of the tasks are not followed and provided respectively
-     * @throws IOException exception when local TaskList.txt file does not exist
+     * @throws IOException exception when there is an I/O error
      */
-    public static void dealWithTodo(ArrayList<Task> tasks, int index, String line, boolean isInTxt) throws UnexpectedCommandException, IOException {
+    public static void dealWithTodo (ArrayList<Task> tasks, int index, String line, boolean isInTxt) throws UnexpectedCommandException, IOException {
         int indexSpace = line.indexOf(" ");
+        final int STATUSINDEX = 4;
+        String errorDescription;
+
         if (indexSpace == -1) {
-            ui.errorMessage("todo description not specified");
+            errorDescription = "todo description not specified";
+            ui.errorMessage(errorDescription);
             throw new UnexpectedCommandException();
         }
 
         String description = line.substring(indexSpace);
         tasks.add(index, new Todo(description));
-        if (isInTxt){
+        if (isInTxt) {
             char[] charArray = line.toCharArray();
-            if (charArray[4] == '1'){
+            if (charArray[STATUSINDEX] == '1') {
                 tasks.get(index).markAsDone();
-            } else{
+            } else {
                 tasks.get(index).unmarkDone();
             }
         }
-
     }
 
     /**
@@ -163,12 +187,12 @@ public static void dealWithTodo(ArrayList<Task> tasks, int index, String line, b
      * @param ListIndex the string containing the task number to delete
      * @param tasks the array of tasks
      */
-    public static void dealWithDelete (String[] inputs, String ListIndex, ArrayList<Task> tasks){
+    public static void dealWithDelete (String[] inputs, String ListIndex, ArrayList<Task> tasks) {
         if (inputs[0].equals("delete")) {
-            int idx = Integer.parseInt(ListIndex);
+            int deleteIdx = Integer.parseInt(ListIndex) - 1; //index of task to delete
             System.out.println("Noted. I've removed this task: ");
-            System.out.println(tasks.get(idx - 1));
-            tasks.remove(idx - 1);
+            System.out.println(tasks.get(deleteIdx));
+            tasks.remove(deleteIdx);
         }
     }
 }
diff --git a/src/main/java/Todo.java b/src/main/java/Todo.java
index d50a314bc..50d8abdcd 100644
--- a/src/main/java/Todo.java
+++ b/src/main/java/Todo.java
@@ -1,9 +1,9 @@
 /**
  * child class of Task to handle todos
  */
-public class Todo extends Task{
+public class Todo extends Task {
 
-    public Todo(String description){
+    public Todo (String description){
         super(description);
     }
     @Override
diff --git a/src/main/java/Ui.java b/src/main/java/Ui.java
index 4788dddc8..1e0a62a5b 100644
--- a/src/main/java/Ui.java
+++ b/src/main/java/Ui.java
@@ -3,20 +3,20 @@
  */
 
 public class Ui {
-    public void sayHi(){
+    public void sayHi() {
         System.out.println("Hello! I'm Apple");
         System.out.println("What can I do for you?");
     }
 
-    public void readCommand(){
+    public void readCommand() {
         System.out.print("Enter your command: ");
     }
 
-    public static void errorMessage(String message){
+    public static void errorMessage (String message) {
         System.out.println(message);
     }
 
-    public void sayBye(){
+    public void sayBye() {
         System.out.println("Bye. Hope to see you again soon!");
     }
 }
diff --git a/src/main/java/UnexpectedCommandException.java b/src/main/java/UnexpectedCommandException.java
index 3d56bc38b..0b8f65fcf 100644
--- a/src/main/java/UnexpectedCommandException.java
+++ b/src/main/java/UnexpectedCommandException.java
@@ -1,2 +1,3 @@
 public class UnexpectedCommandException extends Exception {
+
 }

From fbcc37c9d7366a390aba1485b45de884af80291e Mon Sep 17 00:00:00 2001
From: hongyijie06 <hongyijie06@gmail.com>
Date: Fri, 8 Mar 2024 22:57:17 +0800
Subject: [PATCH 26/28] add README pictures

---
 docs/README.md | 154 ++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 138 insertions(+), 16 deletions(-)

diff --git a/docs/README.md b/docs/README.md
index 8077118eb..fc387c781 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -1,29 +1,151 @@
-# User Guide
+# User Guide for chatbot "Apple"
 
-## Features 
+Chatbot Apple is an app to manage tasks, optimised for use through a Command Line Interface (CLI).
 
-### Feature-ABC
+## Quick Start
+1. Ensure Java 11 or above is installed in your computer
+2. Download `ip.jar` from [here](https://github.com/hongyijie06/ip/releases/tag/A-Release)
+3. Open a command terminal, `cd` into the folder with the jar file and use the `java -jar ip.jar` command to run the application.
 
-Description of the feature.
+A CLI similar to the picture below should appear in a few seconds. Note how the app returns the path to which the list of tasks is saved on the local computer.
 
-### Feature-XYZ
+!("C:\Users\User\Documents\CS2113\ip\docs\welcome_screen.png")
 
-Description of the feature.
+4. Type the command into the command line and press Enter to execute it. e.g. typing list and pressing Enter will list the current tasks.
+Some example commands you can try:
 
-## Usage
+- `todo tutorial`: Adds task "tutorial" to the list
+- `deadline return book by 4pm`: Adds task "return book" nd deadline "4pm" to the list
+- `list`: Lists all tasks
+- `bye`: Exits the app
 
-### `Keyword` - Describe action
+5. Refer to the Features below for more details on each command.
 
-Describe the action and its outcome.
+## Features
 
-Example of usage: 
+[!NOTE]
+> Words in `UPPER_CASE` are parameters to be supplied by the user. e.g. in `delete INDEX`, `INDEX` is a parameter which can be used as `delete 3`
 
-`keyword (optional arguments)`
+## Add tasks
+### Add todo : `todo`
+Adds task of type todo to the list of tasks
 
-Expected outcome:
+Format: `todo DESCRIPTION`
 
-Description of the outcome.
+Examples:
+- `todo tutorial` Adds task `tutorial` to the list of tasks
+- `todo watch lecture` Adds task `watch lecture` to the list of tasks
 
-```
-expected output
-```
+The picture below shows the expected output.
+!("C:\Users\User\Documents\CS2113\ip\docs\add_todo.png")
+
+### Add deadline: `deadline`
+Adds task of type deadline to the list of tasks
+
+Format: `deadline DESCRIPTION by DEADLINE`
+
+Examples:
+- `deadline return book by 4pm` Adds task `return book` with deadline `4pm` to the list of tasks
+- `deadline submit group report by 7pm` Adds task `submit group report` with deadline `7pm` to the list of tasks
+
+The picture below shows the expected output.
+!("C:\Users\User\Documents\CS2113\ip\docs\add_deadline.png")
+
+### Add event: `event`
+Adds task of type event to the list of tasks
+
+Format: `event DESCRIPTION from START to END`
+
+Examples:
+- `event Math exam from 2pm to 4pm` Adds task `Math exam` with timeline `2pm` to `4pm` to the list of tasks
+- `event project group meeting from 11am to 1pm` Adds task `project group meeting` with timeline `11am` to `1pm` to the list of tasks
+
+The picture below shows the expected output.
+!("C:\Users\User\Documents\CS2113\ip\docs\add_event.png")
+
+## Listing tasks: `list`
+Lists all tasks in the task list.
+
+Format: `list`
+
+The picture below shows the expected output.
+!("C:\Users\User\Documents\CS2113\ip\docs\list.png")
+
+## Mark tasks as done: `mark`
+Marks tasks as completed
+
+Format: `mark INDEX`
+
+- Marks task as done at the specified `INDEX`. 
+- The index refers to the index of the task in the list of tasks. 
+- The index must be a positive integer.
+
+Examples: 
+- `mark 1` Marks first task in the list as done
+- `mark 3` Marks sixth task in the list as done
+
+The picture below shows the expected output.
+!("C:\Users\User\Documents\CS2113\ip\docs\mark.png")
+
+## Unmark tasks: `unmark`
+Marks tasks as undone
+
+Format: `unmark INDEX`
+
+- Marks task as not done at the specified `INDEX`. 
+- The index refers to the index of the task in the list of tasks. 
+- The index must be a positive integer.
+
+Examples:
+- `unmark 1` Marks first task in the list as not done
+- `unmark 2` Marks second task in the list as not done
+
+## Find Keywords: `find`
+Filters list of tasks to those containing the keyword the user wants to find
+
+Format: `find KEYWORD`
+
+Examples:
+- `find book` CLI returns a list with all the tasks with the `KEYWORD` `book`.
+- `find group` CLI returns a list with all the tasks with the `KEYWORD` `group`.
+
+The picture below shows the expected output.
+!("C:\Users\User\Documents\CS2113\ip\docs\find.png")
+
+## Delete tasks: `delete`
+Deletes task from the list of tasks
+
+Format: `delete INDEX`
+
+- Deletes task at the specified `INDEX`. 
+- The index refers to the index of the task in the list of tasks. 
+- The index must be a positive integer.
+
+Examples:
+- `delete 3` Deletes third task in the list
+- `delete 5` Deletes fifth task in the list
+
+The picture below shows the expected output.
+!("C:\Users\User\Documents\CS2113\ip\docs\delete.png")
+
+## Exit app: `bye`
+Exits the chatbot
+
+Format: `bye`
+
+The picture below shows the expected output.
+!("C:\Users\User\Documents\CS2113\ip\docs\bye.png")
+
+## Command Summary
+
+| Command | Format, Examples |
+| ------- | --------------- |
+| `todo` | `todo DESCRIPTION` e.g. `todo tutorial` |
+| `deadline` | `deadline DESCRIPTION by DEADLINE` e.g. `deadline return book by 4pm` |
+| `event` | `event DESCRIPTION from START to END` e.g. `event Math exam from 2pm to 4pm` |
+| `list` | `list` |
+| `mark` | `mark INDEX` e.g. `mark 2` |
+| `unmark` | `unmark INDEX` e.g. `unmark 1` |
+| `find` | `find KEYWORD` e.g. `find book` |
+| `delete` | `delete INDEX` e.g. `delete 3` |
+| `bye` | `bye` |
\ No newline at end of file

From 456bcb01f224dfc36ab8ba39223232f0373c077d Mon Sep 17 00:00:00 2001
From: hongyijie06 <hongyijie06@gmail.com>
Date: Fri, 8 Mar 2024 23:17:39 +0800
Subject: [PATCH 27/28] add pictures

---
 docs/README.md | 28 ++++++++++++++--------------
 1 file changed, 14 insertions(+), 14 deletions(-)

diff --git a/docs/README.md b/docs/README.md
index fc387c781..9e10573a7 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -9,15 +9,15 @@ Chatbot Apple is an app to manage tasks, optimised for use through a Command Lin
 
 A CLI similar to the picture below should appear in a few seconds. Note how the app returns the path to which the list of tasks is saved on the local computer.
 
-!("C:\Users\User\Documents\CS2113\ip\docs\welcome_screen.png")
+![welcome](welcome_screen.png)
 
 4. Type the command into the command line and press Enter to execute it. e.g. typing list and pressing Enter will list the current tasks.
-Some example commands you can try:
+   Some example commands you can try:
 
-- `todo tutorial`: Adds task "tutorial" to the list
-- `deadline return book by 4pm`: Adds task "return book" nd deadline "4pm" to the list
-- `list`: Lists all tasks
-- `bye`: Exits the app
+    - `todo tutorial`: Adds task "tutorial" to the list
+    - `deadline return book by 4pm`: Adds task "return book" nd deadline "4pm" to the list
+    - `list`: Lists all tasks
+    - `bye`: Exits the app
 
 5. Refer to the Features below for more details on each command.
 
@@ -37,7 +37,7 @@ Examples:
 - `todo watch lecture` Adds task `watch lecture` to the list of tasks
 
 The picture below shows the expected output.
-!("C:\Users\User\Documents\CS2113\ip\docs\add_todo.png")
+![todo](add_todo.png)
 
 ### Add deadline: `deadline`
 Adds task of type deadline to the list of tasks
@@ -49,7 +49,7 @@ Examples:
 - `deadline submit group report by 7pm` Adds task `submit group report` with deadline `7pm` to the list of tasks
 
 The picture below shows the expected output.
-!("C:\Users\User\Documents\CS2113\ip\docs\add_deadline.png")
+![deadline](add_deadline.png)
 
 ### Add event: `event`
 Adds task of type event to the list of tasks
@@ -61,7 +61,7 @@ Examples:
 - `event project group meeting from 11am to 1pm` Adds task `project group meeting` with timeline `11am` to `1pm` to the list of tasks
 
 The picture below shows the expected output.
-!("C:\Users\User\Documents\CS2113\ip\docs\add_event.png")
+![event](add_event.png)
 
 ## Listing tasks: `list`
 Lists all tasks in the task list.
@@ -69,7 +69,7 @@ Lists all tasks in the task list.
 Format: `list`
 
 The picture below shows the expected output.
-!("C:\Users\User\Documents\CS2113\ip\docs\list.png")
+![list](list.png)
 
 ## Mark tasks as done: `mark`
 Marks tasks as completed
@@ -85,7 +85,7 @@ Examples:
 - `mark 3` Marks sixth task in the list as done
 
 The picture below shows the expected output.
-!("C:\Users\User\Documents\CS2113\ip\docs\mark.png")
+![mark](mark.png)
 
 ## Unmark tasks: `unmark`
 Marks tasks as undone
@@ -110,7 +110,7 @@ Examples:
 - `find group` CLI returns a list with all the tasks with the `KEYWORD` `group`.
 
 The picture below shows the expected output.
-!("C:\Users\User\Documents\CS2113\ip\docs\find.png")
+![find](find.png)
 
 ## Delete tasks: `delete`
 Deletes task from the list of tasks
@@ -126,7 +126,7 @@ Examples:
 - `delete 5` Deletes fifth task in the list
 
 The picture below shows the expected output.
-!("C:\Users\User\Documents\CS2113\ip\docs\delete.png")
+![delete](delete.png)
 
 ## Exit app: `bye`
 Exits the chatbot
@@ -134,7 +134,7 @@ Exits the chatbot
 Format: `bye`
 
 The picture below shows the expected output.
-!("C:\Users\User\Documents\CS2113\ip\docs\bye.png")
+![bye](bye.png)
 
 ## Command Summary
 

From dc9a769c12687a8b786560e3aeb95ad0eb3a7e3e Mon Sep 17 00:00:00 2001
From: hongyijie06 <hongyijie06@gmail.com>
Date: Fri, 8 Mar 2024 23:24:14 +0800
Subject: [PATCH 28/28] improve formatting, no pictures

---
 docs/README.md | 29 -----------------------------
 1 file changed, 29 deletions(-)

diff --git a/docs/README.md b/docs/README.md
index 9e10573a7..096fe006d 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -6,11 +6,6 @@ Chatbot Apple is an app to manage tasks, optimised for use through a Command Lin
 1. Ensure Java 11 or above is installed in your computer
 2. Download `ip.jar` from [here](https://github.com/hongyijie06/ip/releases/tag/A-Release)
 3. Open a command terminal, `cd` into the folder with the jar file and use the `java -jar ip.jar` command to run the application.
-
-A CLI similar to the picture below should appear in a few seconds. Note how the app returns the path to which the list of tasks is saved on the local computer.
-
-![welcome](welcome_screen.png)
-
 4. Type the command into the command line and press Enter to execute it. e.g. typing list and pressing Enter will list the current tasks.
    Some example commands you can try:
 
@@ -36,9 +31,6 @@ Examples:
 - `todo tutorial` Adds task `tutorial` to the list of tasks
 - `todo watch lecture` Adds task `watch lecture` to the list of tasks
 
-The picture below shows the expected output.
-![todo](add_todo.png)
-
 ### Add deadline: `deadline`
 Adds task of type deadline to the list of tasks
 
@@ -48,9 +40,6 @@ Examples:
 - `deadline return book by 4pm` Adds task `return book` with deadline `4pm` to the list of tasks
 - `deadline submit group report by 7pm` Adds task `submit group report` with deadline `7pm` to the list of tasks
 
-The picture below shows the expected output.
-![deadline](add_deadline.png)
-
 ### Add event: `event`
 Adds task of type event to the list of tasks
 
@@ -60,17 +49,11 @@ Examples:
 - `event Math exam from 2pm to 4pm` Adds task `Math exam` with timeline `2pm` to `4pm` to the list of tasks
 - `event project group meeting from 11am to 1pm` Adds task `project group meeting` with timeline `11am` to `1pm` to the list of tasks
 
-The picture below shows the expected output.
-![event](add_event.png)
-
 ## Listing tasks: `list`
 Lists all tasks in the task list.
 
 Format: `list`
 
-The picture below shows the expected output.
-![list](list.png)
-
 ## Mark tasks as done: `mark`
 Marks tasks as completed
 
@@ -84,9 +67,6 @@ Examples:
 - `mark 1` Marks first task in the list as done
 - `mark 3` Marks sixth task in the list as done
 
-The picture below shows the expected output.
-![mark](mark.png)
-
 ## Unmark tasks: `unmark`
 Marks tasks as undone
 
@@ -109,9 +89,6 @@ Examples:
 - `find book` CLI returns a list with all the tasks with the `KEYWORD` `book`.
 - `find group` CLI returns a list with all the tasks with the `KEYWORD` `group`.
 
-The picture below shows the expected output.
-![find](find.png)
-
 ## Delete tasks: `delete`
 Deletes task from the list of tasks
 
@@ -125,17 +102,11 @@ Examples:
 - `delete 3` Deletes third task in the list
 - `delete 5` Deletes fifth task in the list
 
-The picture below shows the expected output.
-![delete](delete.png)
-
 ## Exit app: `bye`
 Exits the chatbot
 
 Format: `bye`
 
-The picture below shows the expected output.
-![bye](bye.png)
-
 ## Command Summary
 
 | Command | Format, Examples |