solution

src/App.tsx

@@ -1,26 +1,190 @@
-/* eslint-disable max-len */
-/* eslint-disable jsx-a11y/control-has-associated-label */
-import React from 'react';
-import { UserWarning } from './UserWarning';
-
-const USER_ID = 0;
+import React, {
+  useCallback,
+  useEffect,
+  useMemo,
+  useRef,
+  useState,
+} from 'react';
+import { TodoHeader } from './components/TodoHeader';
+import { TodoFooter } from './components/TodoFooter';
+import { ErrorNotification } from './components/ErrorNotification';
+import { Todo } from './types/Todo';
+import { addTodo, deleteTodo, getTodos, updateTodo } from './api/todos';
+import { ErrorType } from './types/ErrorType';
+import { FilterStatus } from './types/FilterStatus';
+import { TodoList } from './components/TodoList';
+import { USER_ID } from './constants/api';
 
 export const App: React.FC = () => {
-  if (!USER_ID) {
-    return <UserWarning />;
-  }
+  const [todos, setTodos] = useState<Todo[]>([]);
+  const [errorMessage, setErrorMessage] = useState<ErrorType>(ErrorType.Empty);
+  const [filterStatus, setFilterStatus] = useState<FilterStatus>(
+    FilterStatus.All,
+  );
+  const [tempTodo, setTempTodo] = useState<Todo | null>(null);
+  const [loadingTodoIds, setLoadingTodoIds] = useState<number[]>([]);
+
+  const inputAddRef = useRef<HTMLInputElement>(null);
+
+  const filteredTodos = useMemo(
+    () =>
+      todos.filter(todo => {
+        if (filterStatus === FilterStatus.All) {
+          return true;
+        }
+
+        return filterStatus === FilterStatus.Completed
+          ? todo.completed
+          : !todo.completed;
+      }),
+    [todos, filterStatus],
+  );
+
+  const todosCompletedNum = useMemo(
+    () => todos.filter(todo => todo.completed).length,
+    [todos],
+  );
+
+  const areAllTodosCompleated = useMemo(
+    () => todos.every(todo => todo.completed),
+    [todos],
+  );
+
+  const todosActiveNum = useMemo(
+    () => todos.filter(todo => !todo.completed).length,
+    [todos],
+  );
+
+  const handleAddTodo = useCallback(
+    async (todoTitle: string) => {
+      setTempTodo({
+        id: 0,
+        title: todoTitle,
+        completed: false,
+        userId: USER_ID,
+      });
+      try {
+        const newTodo = await addTodo({ title: todoTitle, completed: false });
+
+        setTodos(prev => [...prev, newTodo]);
+      } catch (err) {
+        setErrorMessage(ErrorType.AddTodo);
+        inputAddRef?.current?.focus();
+        throw err;
+      } finally {
+        setTempTodo(null);
+      }
+    },
+    [setTempTodo, setTodos, setErrorMessage],
+  );
+
+  const handleRemoveTodo = useCallback(
+    async (todoId: number) => {
+      setLoadingTodoIds(prev => [...prev, todoId]);
+      try {
+        await deleteTodo(todoId);
+        setTodos(prev => prev.filter(todo => todo.id !== todoId));
+      } catch (err) {
+        setErrorMessage(ErrorType.DeleteTodo);
+        inputAddRef?.current?.focus();
+        throw err;
+      } finally {
+        setLoadingTodoIds(prev => prev.filter(id => id !== todoId));
+      }
+    },
+    [setLoadingTodoIds, setTodos, setErrorMessage],
+  );
+
+  const handleUpdateTodo = useCallback(
+    async (todoToUpdate: Todo) => {
+      setLoadingTodoIds(prev => [...prev, todoToUpdate.id]);
+      try {
+        const updatedTodo = await updateTodo(todoToUpdate);
+
+        setTodos(prev =>
+          prev.map(todo => (todo.id === updatedTodo.id ? updatedTodo : todo)),
+        );
+      } catch (err) {
+        setErrorMessage(ErrorType.UpdateTodo);
+        throw err;
+      } finally {
+        setLoadingTodoIds(prev => prev.filter(id => id !== todoToUpdate.id));
+      }
+    },
+    [setLoadingTodoIds, setTodos, setErrorMessage],
+  );
+
+  const handleClearCompleted = useCallback(async () => {
+    const completedTodos = todos.filter(todo => todo.completed);
+
+    await Promise.all(completedTodos.map(todo => handleRemoveTodo(todo.id)));
+  }, [todos, handleRemoveTodo]);
+
+  const handleToggleAll = useCallback(async () => {
+    if (todosActiveNum > 0) {
+      const activeTodos = todos.filter(todo => !todo.completed);
+
+      await Promise.all(
+        activeTodos.map(todo => handleUpdateTodo({ ...todo, completed: true })),
+      );
+    } else {
+      await Promise.all(
+        todos.map(todo => handleUpdateTodo({ ...todo, completed: false })),
+      );
+    }
+  }, [todos, todosActiveNum, handleUpdateTodo]);
+
+  useEffect(() => {
+    const getAllTodos = async () => {
+      try {
+        const data = await getTodos();
+
+        setTodos(data);
+      } catch (err) {
+        setErrorMessage(ErrorType.LoadTodos);
+      }
+    };
+
+    getAllTodos();
+  }, []);
 
   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">
+        <TodoHeader
+          handleAddTodo={handleAddTodo}
+          setErrorMessage={setErrorMessage}
+          isInputDisabled={!!tempTodo}
+          inputRef={inputAddRef}
+          handleToggleAll={handleToggleAll}
+          areAllTodosCompleated={areAllTodosCompleated}
+          todosLength={todos.length}
+        />
+
+        {(!!todos.length || tempTodo) && (
+          <>
+            <TodoList
+              filteredTodos={filteredTodos}
+              handleRemoveTodo={handleRemoveTodo}
+              handleUpdateTodo={handleUpdateTodo}
+              loadingTodoIds={loadingTodoIds}
+              tempTodo={tempTodo}
+            />
+
+            <TodoFooter
+              filterStatus={filterStatus}
+              setFilterStatus={setFilterStatus}
+              todosLeft={todosActiveNum}
+              todosCompleted={todosCompletedNum}
+              handleClearCompleted={handleClearCompleted}
+            />
+          </>
+        )}
+      </div>
+
+      <ErrorNotification error={errorMessage} setError={setErrorMessage} />
+    </div>
   );
 };

src/api/todos.ts

@@ -0,0 +1,22 @@
+import { TODOS_API_PATH, USER_ID } from '../constants/api';
+import { Todo } from '../types/Todo';
+import { client } from '../utils/fetchClient';
+
+export const getTodos = () => {
+  return client.get<Todo[]>(`${TODOS_API_PATH}?userId=${USER_ID}`);
+};
+
+export const addTodo = (newTodo: Omit<Todo, 'id' | 'userId'>) => {
+  return client.post<Todo>(`${TODOS_API_PATH}`, {
+    ...newTodo,
+    userId: USER_ID,
+  });
+};
+
+export const deleteTodo = (todoId: number) => {
+  return client.delete(`${TODOS_API_PATH}/${todoId}`);
+};
+
+export const updateTodo = (todo: Todo) => {
+  return client.patch<Todo>(`${TODOS_API_PATH}/${todo.id}`, todo);
+};

src/components/ErrorNotification/ErrorNotification.tsx

@@ -0,0 +1,41 @@
+import { Dispatch, SetStateAction, useEffect } from 'react';
+import cn from 'classnames';
+import { ErrorType } from '../../types/ErrorType';
+
+type Props = {
+  error: ErrorType;
+  setError: Dispatch<SetStateAction<ErrorType>>;
+};
+
+export const ErrorNotification: React.FC<Props> = ({ error, setError }) => {
+  useEffect(() => {
+    if (error === ErrorType.Empty) {
+      return;
+    }
+
+    const timerId = setTimeout(() => {
+      setError(ErrorType.Empty);
+    }, 3000);
+
+    return () => {
+      clearTimeout(timerId);
+    };
+  }, [error, setError]);
+
+  return (
+    <div
+      data-cy="ErrorNotification"
+      className={cn('notification is-danger is-light has-text-weight-normal', {
+        hidden: error === ErrorType.Empty,
+      })}
+    >
+      <button
+        data-cy="HideErrorButton"
+        type="button"
+        className="delete"
+        onClick={() => setError(ErrorType.Empty)}
+      />
+      {error}
+    </div>
+  );
+};

src/components/ErrorNotification/index.ts

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

src/components/TodoFooter/TodoFooter.tsx

@@ -0,0 +1,54 @@
+import { Dispatch, SetStateAction } from 'react';
+
+import cn from 'classnames';
+import { FilterStatus } from '../../types/FilterStatus';
+
+type Props = {
+  filterStatus: FilterStatus;
+  setFilterStatus: Dispatch<SetStateAction<FilterStatus>>;
+  todosLeft: number;
+  todosCompleted: number;
+  handleClearCompleted: () => Promise<void>;
+};
+
+export const TodoFooter: React.FC<Props> = ({
+  filterStatus,
+  setFilterStatus,
+  todosLeft,
+  todosCompleted,
+  handleClearCompleted,
+}) => {
+  return (
+    <footer className="todoapp__footer" data-cy="Footer">
+      <span className="todo-count" data-cy="TodosCounter">
+        {todosLeft} items left
+      </span>
+
+      <nav className="filter" data-cy="Filter">
+        {Object.values(FilterStatus).map(filter => (
+          <a
+            key={filter}
+            href={`#/${filter !== FilterStatus.All && filter.toLowerCase()}`}
+            className={cn('filter__link', {
+              selected: filterStatus === filter,
+            })}
+            data-cy={`FilterLink${filter}`}
+            onClick={() => setFilterStatus(filter)}
+          >
+            {filter}
+          </a>
+        ))}
+      </nav>
+
+      <button
+        type="button"
+        className="todoapp__clear-completed"
+        data-cy="ClearCompletedButton"
+        onClick={handleClearCompleted}
+        disabled={!todosCompleted}
+      >
+        Clear completed
+      </button>
+    </footer>
+  );
+};

src/components/TodoFooter/index.ts

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