Solution

src/App.tsx

@@ -1,26 +1,170 @@
-/* eslint-disable max-len */
+/* eslint-disable jsx-a11y/label-has-associated-control */
 /* eslint-disable jsx-a11y/control-has-associated-label */
-import React from 'react';
-import { UserWarning } from './UserWarning';
+import React, { useEffect, useMemo, useRef, useState } from 'react';
+import * as todoService from './api/todos';
+import { Todo } from './types/Todo';
 
-const USER_ID = 0;
+import { Header } from './components/Header/Header';
+import { Footer } from './components/Footer/Footer';
+import { UserWarning } from './UserWarning';
+import { Errors } from './types/Errors';
+import { ErrorNotification } from './components/ErrorNotification';
+import { FilterType } from './types/FilterType';
+import { TodoList } from './components/TodoList/TodoList';
 
 export const App: React.FC = () => {
-  if (!USER_ID) {
+  const [todos, setTodos] = useState<Todo[]>([]);
+  const [errorMessage, setErrorMessage] = useState<Errors>(Errors.Empty);
+  const [filteredField, setFilteredField] = useState<FilterType>(
+    FilterType.All,
+  );
+  const [tempTodo, setTempTodo] = useState<Todo | null>(null);
+  const [loadingTodoIds, setLoadingTodoIds] = useState<number[]>([]);
+  const inputAddRef = useRef<HTMLInputElement>(null);
+
+  const todosActiveNumber = useMemo(() => {
+    return todos.filter(todo => !todo.completed).length;
+  }, [todos]);
+
+  const areAllTodosCompleted = useMemo(() => {
+    return todos.every(todo => todo.completed === true);
+  }, [todos]);
+
+  useEffect(() => {
+    (async () => {
+      try {
+        const data = await todoService.getTodos();
+
+        setTodos(data);
+      } catch (err) {
+        setErrorMessage(Errors.UnableToLoad);
+      }
+    })();
+  }, []);
+
+  const onAddTodo = async (todoTitle: string) => {
+    setTempTodo({
+      id: 0,
+      title: todoTitle,
+      completed: false,
+      userId: todoService.USER_ID,
+    });
+    try {
+      const newTodo = await todoService.addTodo({
+        title: todoTitle,
+        completed: false,
+      });
+
+      setTodos(prev => [...prev, newTodo]);
+    } catch (err) {
+      setErrorMessage(Errors.UnableToAdd);
+      inputAddRef?.current?.focus();
+      throw err;
+    } finally {
+      setTempTodo(null);
+    }
+  };
+
+  const onRemoveTodo = async (todoId: number) => {
+    setLoadingTodoIds(prev => [...prev, todoId]);
+    try {
+      await todoService.deleteTodo(todoId);
+
+      setTodos(prev => prev.filter(todo => todo.id !== todoId));
+    } catch (err) {
+      setErrorMessage(Errors.UnableToDelete);
+      inputAddRef?.current?.focus();
+      throw err;
+    } finally {
+      setLoadingTodoIds(prev => prev.filter(id => id !== todoId));
+    }
+  };
+
+  const onUpdateTodo = async (todoToUpdate: Todo) => {
+    setLoadingTodoIds(prev => [...prev, todoToUpdate.id]);
+    try {
+      const updatedTodo = await todoService.updateTodo(todoToUpdate);
+
+      setTodos(prev =>
+        prev.map(todo => (todo.id === updatedTodo.id ? updatedTodo : todo)),
+      );
+    } catch (err) {
+      setErrorMessage(Errors.UnableToUpdate);
+      throw err;
+    } finally {
+      setLoadingTodoIds(prev => prev.filter(id => id !== todoToUpdate.id));
+    }
+  };
+
+  const onToggleAll = async () => {
+    if (todosActiveNumber > 0) {
+      todos
+        .filter(todo => !todo.completed)
+        .forEach(item => onUpdateTodo({ ...item, completed: true }));
+    } else {
+      todos.forEach(todo => onUpdateTodo({ ...todo, completed: false }));
+    }
+  };
+
+  const onClearCompleted = async () => {
+    const completedTodo = todos.filter(todo => todo.completed);
+
+    completedTodo.forEach(todo => onRemoveTodo(todo.id));
+  };
+
+  const filteredTodos = todos.filter(todo => {
+    switch (filteredField) {
+      case FilterType.Active:
+        return !todo.completed;
+      case FilterType.Completed:
+        return todo.completed;
+      default:
+        return todos;
+    }
+  });
+
+  if (!todoService.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
+          setErrorMessage={setErrorMessage}
+          onAddTodo={onAddTodo}
+          isInputDisabled={!!tempTodo}
+          onToggleAll={onToggleAll}
+          todosLength={todos.length}
+          inputRef={inputAddRef}
+          areAllTodosCompleted={areAllTodosCompleted}
+        />
+
+        {(todos.length > 0 || tempTodo) && (
+          <>
+            <TodoList
+              todos={filteredTodos}
+              onRemoveTodo={onRemoveTodo}
+              onUpdateTodo={onUpdateTodo}
+              loadingTodoIds={loadingTodoIds}
+              tempTodo={tempTodo}
+            />
+            <Footer
+              todos={todos}
+              filteredField={filteredField}
+              setFilteredField={setFilteredField}
+              activeTodo={todosActiveNumber}
+              onClearCompleted={onClearCompleted}
+            />
+          </>
+        )}
+      </div>
+      <ErrorNotification
+        error={errorMessage}
+        setErrorMessage={setErrorMessage}
+      />
+    </div>
   );
 };

src/api/todos.ts

@@ -0,0 +1,20 @@
+import { Todo } from '../types/Todo';
+import { client } from '../utils/fetchClient';
+
+export const USER_ID = 2136;
+
+export const getTodos = () => {
+  return client.get<Todo[]>(`/todos?userId=${USER_ID}`);
+};
+
+export const deleteTodo = (todoId: number) => {
+  return client.delete(`/todos/${todoId}`);
+};
+
+export const addTodo = (newTodo: Omit<Todo, 'id' | 'userId'>) => {
+  return client.post<Todo>('/todos', { ...newTodo, userId: USER_ID });
+};
+
+export function updateTodo(todo: Todo) {
+  return client.patch<Todo>(`/todos/${todo.id}`, todo);
+}

src/components/ErrorNotification/ErrorNotification.tsx

@@ -0,0 +1,43 @@
+import classNames from 'classnames';
+import { Errors } from '../../types/Errors';
+import { Dispatch, SetStateAction, useEffect } from 'react';
+
+type Props = {
+  error: Errors;
+  setErrorMessage: Dispatch<SetStateAction<Errors>>;
+};
+export const ErrorNotification: React.FC<Props> = props => {
+  const { error, setErrorMessage } = props;
+
+  useEffect(() => {
+    if (error === Errors.Empty) {
+      return;
+    }
+
+    const timerId = setTimeout(() => {
+      setErrorMessage(Errors.Empty);
+    }, 3000);
+
+    return () => {
+      clearTimeout(timerId);
+    };
+  }, [error, setErrorMessage]);
+
+  return (
+    <div
+      data-cy="ErrorNotification"
+      className={classNames(
+        'notification is-danger is-light has-text-weight-normal',
+        { hidden: !error.length },
+      )}
+    >
+      <button
+        data-cy="HideErrorButton"
+        type="button"
+        className="delete"
+        onClick={() => setErrorMessage(Errors.Empty)}
+      />
+      {error}
+    </div>
+  );
+};

src/components/ErrorNotification/index.ts

@@ -0,0 +1 @@
+export * from './ErrorNotification';

src/components/Footer/Footer.tsx

@@ -0,0 +1,55 @@
+import classNames from 'classnames';
+
+import { Dispatch, SetStateAction } from 'react';
+import { Todo } from '../../types/Todo';
+import { FilterType } from '../../types/FilterType';
+
+type Props = {
+  todos: Todo[];
+  activeTodo: number;
+  filteredField: FilterType;
+  setFilteredField: Dispatch<SetStateAction<FilterType>>;
+  onClearCompleted: () => Promise<void>;
+};
+
+export const Footer: React.FC<Props> = ({
+  todos,
+  activeTodo,
+  filteredField,
+  setFilteredField,
+  onClearCompleted,
+}) => {
+  return (
+    <footer className="todoapp__footer" data-cy="Footer">
+      <span className="todo-count" data-cy="TodosCounter">
+        {activeTodo} items left
+      </span>
+
+      <nav className="filter" data-cy="Filter">
+        {Object.values(FilterType).map(filter => (
+          <a
+            key={filter}
+            href={`#/${filter === FilterType.All ? '' : filter.toLowerCase()}`}
+            className={classNames('filter__link', {
+              selected: filteredField === filter,
+            })}
+            data-cy={`FilterLink${filter}`}
+            onClick={() => setFilteredField(filter)}
+          >
+            {filter}
+          </a>
+        ))}
+      </nav>
+
+      <button
+        type="button"
+        className="todoapp__clear-completed"
+        data-cy="ClearCompletedButton"
+        disabled={todos.every(todo => !todo.completed)}
+        onClick={onClearCompleted}
+      >
+        Clear completed
+      </button>
+    </footer>
+  );
+};

src/components/Header/Header.tsx

@@ -0,0 +1,81 @@
+import React, { Dispatch, SetStateAction, useEffect, useState } from 'react';
+import cn from 'classnames';
+import { Errors } from '../../types/Errors';
+
+type Props = {
+  setErrorMessage: Dispatch<SetStateAction<Errors>>;
+  onAddTodo: (value: string) => Promise<void>;
+  isInputDisabled: boolean;
+  onToggleAll: () => Promise<void>;
+  todosLength: number;
+  inputRef: React.RefObject<HTMLInputElement> | null;
+  areAllTodosCompleted: boolean;
+};
+
+export const Header: React.FC<Props> = props => {
+  const {
+    setErrorMessage,
+    onAddTodo,
+    isInputDisabled,
+    onToggleAll,
+    todosLength,
+    inputRef,
+    areAllTodosCompleted,
+  } = props;
+  const [inputValue, setInputValue] = useState('');
+
+  const onSubmit = async (event: React.FormEvent<HTMLFormElement>) => {
+    event.preventDefault();
+
+    if (inputValue.trim() === '') {
+      setErrorMessage(Errors.EmptyTitle);
+
+      return;
+    }
+
+    try {
+      await onAddTodo(inputValue.trim());
+      setInputValue('');
+    } catch (err) {}
+  };
+
+  useEffect(() => {
+    inputRef?.current?.focus();
+  }, [todosLength, inputRef]);
+
+  useEffect(() => {
+    if (!isInputDisabled) {
+      inputRef?.current?.focus();
+    }
+  }, [isInputDisabled, inputRef]);
+
+  return (
+    <header className="todoapp__header">
+      {todosLength !== 0 && (
+        <button
+          type="button"
+          className={cn('todoapp__toggle-all', {
+            active: areAllTodosCompleted,
+          })}
+          data-cy="ToggleAllButton"
+          onClick={onToggleAll}
+        />
+      )}
+
+      <form onSubmit={onSubmit}>
+        <input
+          data-cy="NewTodoField"
+          type="text"
+          className="todoapp__new-todo"
+          placeholder="What needs to be done?"
+          ref={inputRef}
+          value={inputValue}
+          onChange={event => {
+            setInputValue(event.target.value);
+          }}
+          disabled={isInputDisabled}
+        />
+      </form>
+    </header>
+  );
+};