add solution

src/App.tsx

@@ -1,26 +1,252 @@
 /* eslint-disable max-len */
 /* eslint-disable jsx-a11y/control-has-associated-label */
-import React from 'react';
+/* eslint-disable jsx-a11y/label-has-associated-control */
+/* eslint-disable jsx-a11y/control-has-associated-label */
+import React, { useEffect, useRef, useState } from 'react';
 import { UserWarning } from './UserWarning';
-
-const USER_ID = 0;
+import * as postService from './api/todos';
+import { Todo } from './Types/Todo';
+import { TodoFooter } from './Components/Footer/TodoFooter';
+import { TodoItem } from './Components/TodoItem/TodoItem';
+import { ErrorNotification } from './Components/Errors/ErrorNotification';
+import { ErrorType, FilterStatus } from './Types/Types';
+import { CSSTransition, TransitionGroup } from 'react-transition-group';
 
 export const App: React.FC = () => {
-  if (!USER_ID) {
+  const [todos, setTodos] = useState<Todo[]>([]);
+  const [loading, setLoading] = useState(true);
+  const [errorMessage, setErrorMessage] = useState<ErrorType | ''>('');
+  const [filterStatus, setFilterStatus] = useState<FilterStatus>(
+    FilterStatus.All,
+  );
+  const [newTodoTask, setNewTodoTask] = useState('');
+  const [isSubmitting, setIsSubmitting] = useState(false);
+  const [tempTodo, setTempTodo] = useState<Todo | null>(null);
+  const [isProcessing, setIsProcessing] = useState<number[]>([]);
+
+  const visibleTodos = todos.filter(todo => {
+    if (filterStatus === FilterStatus.Active) {
+      return !todo.completed;
+    }
+
+    if (filterStatus === FilterStatus.Completed) {
+      return todo.completed;
+    }
+
+    return true;
+  });
+
+  const isAllCompleted =
+    todos.length > 0 && todos.every(todo => todo.completed);
+  const activeCount = todos.filter(todo => !todo.completed).length;
+  const hasCompleted = todos.some(todo => todo.completed);
+
+  function loadTodos() {
+    setLoading(true);
+
+    postService
+      .getTodos()
+      .then(setTodos)
+      .catch(() => setErrorMessage(ErrorType.Load))
+      .finally(() => setLoading(false));
+  }
+
+  useEffect(loadTodos, []);
+
+  const handleTaskChange = (event: React.ChangeEvent<HTMLInputElement>) => {
+    setNewTodoTask(event.target.value);
+    setErrorMessage('');
+  };
+
+  const handleSubmit = (event: React.FormEvent) => {
+    event.preventDefault();
+    const trimSpacesTitle = newTodoTask.trim();
+
+    if (!trimSpacesTitle) {
+      setErrorMessage(ErrorType.EmptyTitle);
+
+      return;
+    }
+
+    setIsSubmitting(true);
+
+    const newTempTodo: Todo = {
+      id: 0,
+      title: trimSpacesTitle,
+      userId: postService.USER_ID,
+      completed: false,
+    };
+
+    setTempTodo(newTempTodo);
+
+    postService
+      .createTodo({
+        title: trimSpacesTitle,
+        userId: postService.USER_ID,
+        completed: false,
+      })
+
+      .then(newTodo => {
+        setTodos(currentTodo => [...currentTodo, newTodo]);
+        setNewTodoTask('');
+      })
+      .catch(() => setErrorMessage(ErrorType.Add))
+      .finally(() => {
+        setTempTodo(null);
+        setIsSubmitting(false);
+      });
+  };
+
+  const field = useRef<HTMLInputElement>(null);
+
+  useEffect(() => {
+    if (!isSubmitting && !loading && isProcessing.length === 0) {
+      const timeoutId = setTimeout(() => {
+        field.current?.focus();
+      }, 50);
+
+      return () => clearTimeout(timeoutId);
+    }
+
+    return undefined;
+  }, [isSubmitting, loading, isProcessing]);
+
+  async function deleteItem(todoId: number) {
+    setLoading(true);
+    setIsProcessing(current => [...current, todoId]);
+    try {
+      await postService.deleteTodo(todoId);
+
+      setTodos(currentItem => currentItem.filter(todo => todo.id !== todoId));
+    } catch (error) {
+      setErrorMessage(ErrorType.Delete);
+      throw error;
+    } finally {
+      setIsProcessing(current => current.filter(id => id !== todoId));
+      setLoading(false);
+    }
+  }
+
+  const clearCompleted = () => {
+    const completedIds = todos.filter(todo => todo.completed);
+
+    const deletePromises = completedIds.map(todo => {
+      return deleteItem(todo.id);
+    });
+
+    Promise.all(deletePromises)
+      .then(() => {
+        setTodos(prev => prev.filter(t => !t.completed));
+      })
+      .catch(() => setErrorMessage(ErrorType.Delete));
+  };
+
+  async function handleUpdate(todoId: number, data: Partial<Todo>) {
+    setIsProcessing(current => [...current, todoId]);
+    try {
+      try {
+        const updatedTodo = await postService.updateTodo(todoId, data);
+
+        setTodos(prev =>
+          prev.map(todo => (todo.id === todoId ? updatedTodo : todo)),
+        );
+      } catch (error) {
+        setErrorMessage(ErrorType.Update);
+        throw error;
+      }
+    } finally {
+      setIsProcessing(current_1 => current_1.filter(id => id !== todoId));
+    }
+  }
+
+  const toggleAll = () => {
+    const shouldCompleteAll = !isAllCompleted;
+    const todosToUpdate = todos.filter(
+      todo => todo.completed !== shouldCompleteAll,
+    );
+
+    const updatedTodos = todosToUpdate.map(todo => {
+      return handleUpdate(todo.id, { completed: shouldCompleteAll });
+    });
+
+    Promise.all(updatedTodos).catch(() => {
+      setErrorMessage(ErrorType.Update);
+    });
+  };
+
+  if (!postService.USER_ID) {
     return <UserWarning />;
   }
 
   return (
-    <section className="section container">
-      <p className="title is-4">
-        Copy all you need from the prev task:
-        <br />
-        <a href="https://github.com/mate-academy/react_todo-app-add-and-delete#react-todo-app-add-and-delete">
-          React Todo App - Add and Delete
-        </a>
-      </p>
-
-      <p className="subtitle">Styles are already copied</p>
-    </section>
+    <div className="todoapp">
+      <h1 className="todoapp__title">todos</h1>
+
+      <div className="todoapp__content">
+        <header className="todoapp__header">
+          {todos.length > 0 && (
+            <button
+              type="button"
+              className={`todoapp__toggle-all ${isAllCompleted ? 'active' : ''}`}
+              data-cy="ToggleAllButton"
+              onClick={toggleAll}
+            />
+          )}
+          <form onSubmit={handleSubmit}>
+            <input
+              ref={field}
+              data-cy="NewTodoField"
+              type="text"
+              className="todoapp__new-todo"
+              placeholder="What needs to be done?"
+              value={newTodoTask}
+              onChange={handleTaskChange}
+              disabled={isSubmitting}
+            />
+          </form>
+        </header>
+
+        <section className="todoapp__main" data-cy="TodoList">
+          <TransitionGroup>
+            {visibleTodos.map(todo => (
+              <CSSTransition key={todo.id} timeout={300} classNames="item">
+                <TodoItem
+                  key={todo.id}
+                  todo={todo}
+                  onDelete={deleteItem}
+                  isLoading={isProcessing.includes(todo.id)}
+                  updateTodo={handleUpdate}
+                />
+              </CSSTransition>
+            ))}
+            {tempTodo && (
+              <CSSTransition key={0} timeout={300} classNames="temp-item">
+                <TodoItem
+                  todo={tempTodo}
+                  onDelete={() => {}}
+                  isLoading={true}
+                  updateTodo={() => Promise.resolve()}
+                />
+              </CSSTransition>
+            )}
+          </TransitionGroup>
+        </section>
+
+        {todos.length > 0 && (
+          <TodoFooter
+            activeCount={activeCount}
+            filterStatus={filterStatus}
+            hasCompleted={hasCompleted}
+            onFilterChange={setFilterStatus}
+            onClearCompleted={clearCompleted}
+          />
+        )}
+
+        <ErrorNotification
+          message={errorMessage}
+          onClose={() => setErrorMessage('')}
+        />
+      </div>
+    </div>
   );
 };

src/Components/Errors/ErrorNotification.tsx

@@ -0,0 +1,34 @@
+import { useEffect } from 'react';
+
+type Props = {
+  message: string;
+  onClose: () => void;
+};
+
+export const ErrorNotification: React.FC<Props> = ({ message, onClose }) => {
+  useEffect(() => {
+    if (!message) {
+      return;
+    }
+
+    const timer = setTimeout(onClose, 3000);
+
+    return () => clearTimeout(timer);
+  }, [message, onClose]);
+
+  return (
+    <div
+      data-cy="ErrorNotification"
+      className={`notification is-danger is-light has-text-weight-normal ${!message ? 'hidden' : ''}`}
+      hidden={!message}
+    >
+      <button
+        data-cy="HideErrorButton"
+        type="button"
+        className="delete"
+        onClick={onClose}
+      />
+      {message}
+    </div>
+  );
+};

src/Components/Footer/TodoFooter.tsx

@@ -0,0 +1,53 @@
+import React from 'react';
+import '../../styles/todoapp.scss';
+import { FilterStatus } from '../../Types/Types';
+
+type Props = {
+  activeCount: number;
+  hasCompleted: boolean;
+  filterStatus: FilterStatus;
+  onFilterChange: (status: FilterStatus) => void;
+  onClearCompleted: () => void;
+};
+
+export const TodoFooter: React.FC<Props> = ({
+  activeCount,
+  hasCompleted,
+  filterStatus,
+  onFilterChange,
+  onClearCompleted,
+}) => {
+  return (
+    <footer className="todoapp__footer" data-cy="Footer">
+      <span className="todo-count" data-cy="TodosCounter">
+        {activeCount} items left
+      </span>
+
+      <nav className="filter" data-cy="Filter">
+        {Object.values(FilterStatus).map(status => (
+          <a
+            key={status}
+            href={`#/${status === 'all' ? '' : status}`}
+            className={`filter__link ${filterStatus === status ? 'selected' : ''}`}
+            data-cy={`FilterLink${status.charAt(0).toUpperCase() + status.slice(1)}`}
+            onClick={() => {
+              onFilterChange(status);
+            }}
+          >
+            {status.charAt(0).toUpperCase() + status.slice(1)}
+          </a>
+        ))}
+      </nav>
+
+      <button
+        type="button"
+        className="todoapp__clear-completed"
+        data-cy="ClearCompletedButton"
+        disabled={!hasCompleted}
+        onClick={onClearCompleted}
+      >
+        Clear completed
+      </button>
+    </footer>
+  );
+};

src/Components/Loader/Loader.tsx

@@ -0,0 +1,16 @@
+import React from 'react';
+type Props = {
+  isLoading?: boolean;
+};
+
+export const Loader: React.FC<Props> = ({ isLoading = true }) => {
+  return (
+    <div
+      data-cy="TodoLoader"
+      className={`modal overlay ${isLoading ? 'is-active' : ''}`}
+    >
+      <div className="modal-background has-background-white-ter" />
+      <div className="loader" />
+    </div>
+  );
+};