updates

src/main/java/duke/Duke.java

@@ -0,0 +1,81 @@
+import java.util.ArrayList;
+import java.util.Scanner;
+
+public class Duke {
+    public static void main(String[] args) {
+        String line;
+        ArrayList<Task> tasks = new ArrayList<>();
+        Scanner sc = new Scanner(System.in);
+        printHorizontalLine();
+        System.out.println("  Hello! I'm Duke");
+        System.out.println("  What can I do for you?");
+        printHorizontalLine();
+        line = sc.nextLine();
+        while (!line.equals("bye")) {
+            try {
+                if (line.equals("list")) {
+                    printHorizontalLine();
+                    System.out.println("  Here are the tasks in your list:");
+                    for (int i = 0; i < tasks.size(); i++) {
+                        System.out.println("  " + (i + 1) + ":" + tasks.get(i));
+                    }
+                    printHorizontalLine();
+                } else if (line.startsWith("done")) {
+                    printHorizontalLine();
+                    int taskNumberCompleted = Integer.parseInt(line.replaceAll("\\D+", "")) - 1;
+                    tasks.get(taskNumberCompleted).completeTask();
+                    System.out.println("  Nice! I've marked this task as done:");
+                    System.out.println("   " + ":" + tasks.get(taskNumberCompleted));
+                    printHorizontalLine();
+                    System.out.println();
+                } else if (line.startsWith("todo")) {
+                    printHorizontalLine();
+                    System.out.println("  Got it. I've added this task:");
+                    tasks.add(new ToDo(line));
+                    System.out.println("  " + new ToDo(line));
+                    System.out.println("  Now you have " + tasks.size() + " tasks in the list.");
+                    printHorizontalLine();
+                } else if (line.startsWith("deadline")) {
+                    printHorizontalLine();
+                    System.out.println("  Got it. I've added this task:");
+                    tasks.add(new Deadline(line));
+                    System.out.println("  " + new Deadline(line));
+                    System.out.println("  Now you have " + tasks.size() + " tasks in the list.");
+                    printHorizontalLine();
+                } else if (line.startsWith("event")) {
+                    printHorizontalLine();
+                    System.out.println("  Got it. I've added this task:");
+                    tasks.add(new Event(line));
+                    System.out.println("  " + new Event(line));
+                    System.out.println("  Now you have " + tasks.size() + " tasks in the list.");
+                    printHorizontalLine();
+                } else if (line.isEmpty()) {
+                    printHorizontalLine();
+                    System.out.println("  ☹ OOPS!!! The description of a task cannot be empty.");
+                    printHorizontalLine();
+                } else {
+                    printHorizontalLine();
+                    System.out.println("  ☹ OOPS!!! I'm sorry, but I don't know what that means :-(");
+                    printHorizontalLine();
+                    System.out.println();
+                }
+            } catch (StringIndexOutOfBoundsException e) {
+                printHorizontalLine();
+                System.out.println("The task you input has missing fields!");
+                printHorizontalLine();
+            } catch (Exception e) {
+                printHorizontalLine();
+                System.out.println("Something went wrong!");
+                printHorizontalLine();
+            }
+            line = sc.nextLine();
+        }
+        printHorizontalLine();
+        System.out.println("  Bye. Hope to see you again soon!");
+        printHorizontalLine();
+    }
+
+    private static void printHorizontalLine() {
+        System.out.println(" ____________________________________________________________");
+    }
+}

src/main/java/duke/tasks/Deadline.java

@@ -0,0 +1,23 @@
+package tasks;
+
+public class Deadline extends Task{
+	protected String by;
+
+	public Deadline(String description, String by) {
+		super(description);
+		this.by = by;
+	}
+
+	public String getBy() {
+		return by;
+	}
+
+	public void setBy(String by) {
+		this.by = by;
+	}
+
+	@Override
+	public String toString() {
+		return "[D]" + super.toString() + String.format(" (by: %s)",this.getBy());
+	}
+}

src/main/java/duke/tasks/Event.java

@@ -0,0 +1,23 @@
+package tasks;
+
+public class Event extends Task{
+	protected String period;
+
+	public Event(String description, String period) {
+		super(description);
+		this.period = period;
+	}
+
+	public String getPeriod() {
+		return period;
+	}
+
+	public void setPeriod(String period) {
+		this.period = period;
+	}
+
+	@Override
+	public String toString() {
+		return "[E]" + super.toString() + String.format(" (at: %s)",this.getPeriod());
+	}
+}

src/main/java/duke/tasks/Task.java

@@ -0,0 +1,74 @@
+package tasks;
+
+import Commands;
+
+import java.util.ArrayList;
+
+public class Task {
+    protected String description;
+    protected boolean isDone;
+    protected static int numTotalTasks = 0;
+
+    protected Task(String description) {
+        this.description = description;
+        this.isDone = false;
+        numTotalTasks++;
+    }
+
+    public String getStatusIcon() {
+        return (isDone ? "\u2713" : "\u2718"); //return tick or X symbols
+    }
+
+    public void setDone() {
+        isDone = true;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public static int getNumTotalTasks() {
+        return numTotalTasks;
+    }
+
+    @Override
+    public String toString(){
+        return "[" + this.getStatusIcon() + "]" + this.getDescription();
+    }
+
+    public static boolean parseTask(String taskInString, ArrayList<Task> tasks) {
+        char type = taskInString.charAt(1);
+        char status = taskInString.charAt(4);
+        taskInString = taskInString.substring(6);
+        Task buffer;
+        String[] splitCommands;
+        String description;
+        String time;
+
+        switch (type) {
+        case 'T':
+            buffer = new Todo(taskInString);
+            break;
+        case 'E':
+            splitCommands = taskInString.split("\\(at: ");
+            description = splitCommands[0].strip();
+            time = splitCommands[1].substring(0, splitCommands[1].length()-1).strip();
+            buffer = new Event(description, time);
+            break;
+        case 'D':
+            splitCommands = taskInString.split("\\(by: ");
+            description = splitCommands[0].strip();
+            time = splitCommands[1].substring(0, splitCommands[1].length()-1).strip();
+            buffer = new Deadline(splitCommands[0], splitCommands[1]);
+            break;
+        default:
+            System.out.println("Error: Wrong input file syntax.");
+            return false;
+        }
+        if (status == '\u2713') {
+            buffer.setDone();
+        }
+        tasks.add(buffer);
+        return true;
+    }
+}

src/main/java/duke/tasks/Todo.java

@@ -0,0 +1,12 @@
+package tasks;
+
+public class Todo extends Task {
+	public Todo(String description) {
+		super(description);
+	}
+
+	@Override
+	public String toString() {
+		return "[T]" + super.toString();
+	}
+}