add task solution

src/App.tsx

@@ -1,93 +1,10 @@
 /* eslint-disable jsx-a11y/control-has-associated-label */
 import React from 'react';
-
-export const App: React.FC = () => {
-  return (
-    <div className="todoapp">
-      <header className="header">
-        <h1>todos</h1>
-
-        <form>
-          <input
-            type="text"
-            data-cy="createTodo"
-            className="new-todo"
-            placeholder="What needs to be done?"
-          />
-        </form>
-      </header>
-
-      <section className="main">
-        <input
-          type="checkbox"
-          id="toggle-all"
-          className="toggle-all"
-          data-cy="toggleAll"
-        />
-        <label htmlFor="toggle-all">Mark all as complete</label>
-
-        <ul className="todo-list" data-cy="todoList">
-          <li>
-            <div className="view">
-              <input type="checkbox" className="toggle" id="toggle-view" />
-              <label htmlFor="toggle-view">asdfghj</label>
-              <button type="button" className="destroy" data-cy="deleteTodo" />
-            </div>
-            <input type="text" className="edit" />
-          </li>
-
-          <li className="completed">
-            <div className="view">
-              <input type="checkbox" className="toggle" id="toggle-completed" />
-              <label htmlFor="toggle-completed">qwertyuio</label>
-              <button type="button" className="destroy" data-cy="deleteTodo" />
-            </div>
-            <input type="text" className="edit" />
-          </li>
-
-          <li className="editing">
-            <div className="view">
-              <input type="checkbox" className="toggle" id="toggle-editing" />
-              <label htmlFor="toggle-editing">zxcvbnm</label>
-              <button type="button" className="destroy" data-cy="deleteTodo" />
-            </div>
-            <input type="text" className="edit" />
-          </li>
-
-          <li>
-            <div className="view">
-              <input type="checkbox" className="toggle" id="toggle-view2" />
-              <label htmlFor="toggle-view2">1234567890</label>
-              <button type="button" className="destroy" data-cy="deleteTodo" />
-            </div>
-            <input type="text" className="edit" />
-          </li>
-        </ul>
-      </section>
-
-      <footer className="footer">
-        <span className="todo-count" data-cy="todosCounter">
-          3 items left
-        </span>
-
-        <ul className="filters">
-          <li>
-            <a href="#/" className="selected">All</a>
-          </li>
-
-          <li>
-            <a href="#/active">Active</a>
-          </li>
-
-          <li>
-            <a href="#/completed">Completed</a>
-          </li>
-        </ul>
-
-        <button type="button" className="clear-completed">
-          Clear completed
-        </button>
-      </footer>
-    </div>
-  );
-};
+import { TodosProvider } from './TodosContext';
+import { TodoApp } from './components/TodoApp';
+
+export const App: React.FC = () => (
+  <TodosProvider>
+    <TodoApp />
+  </TodosProvider>
+);

src/TodosContext.tsx

@@ -0,0 +1,58 @@
+import React, { useState } from 'react';
+import { Option } from './types/Option';
+import { useLocalStorage } from './hooks/useLocalStorage';
+import { Todo } from './types/Todo';
+import { Context } from './types/Context';
+
+const initialValue: Context = {
+  todos: [],
+  setTodos: () => { },
+  filter: Option.All,
+  setFilter: () => { },
+  visibleTodos: [],
+  isToggleCheckedAll: false,
+  setIsToggleCheckedAll: () => {},
+};
+
+export const TodosContext = React.createContext(initialValue);
+
+type Props = {
+  children: React.ReactNode;
+};
+
+export const TodosProvider: React.FC<Props> = ({ children }) => {
+  const [todos, setTodos] = useLocalStorage<Todo[]>('todos', []);
+  const [filter, setFilter] = useState(Option.All);
+  const [isToggleCheckedAll, setIsToggleCheckedAll]
+    = useState(todos.every(todo => todo.completed));
+
+  const visibleTodos = todos.filter(todo => {
+    switch (filter) {
+      case Option.Active:
+        return !todo.completed;
+
+      case Option.Completed:
+        return todo.completed;
+
+      case Option.All:
+      default:
+        return true;
+    }
+  });
+
+  const context: Context = {
+    todos,
+    setTodos,
+    filter,
+    setFilter,
+    visibleTodos,
+    isToggleCheckedAll,
+    setIsToggleCheckedAll,
+  };
+
+  return (
+    <TodosContext.Provider value={context}>
+      {children}
+    </TodosContext.Provider>
+  );
+};

src/components/Footer.tsx

@@ -0,0 +1,76 @@
+import React, { useContext } from 'react';
+import cn from 'classnames';
+import { TodosContext } from '../TodosContext';
+import { Option } from '../types/Option';
+
+export const Footer: React.FC = () => {
+  const {
+    todos,
+    setTodos,
+    filter,
+    setFilter,
+  } = useContext(TodosContext);
+
+  const TotalUncompletedTodos = todos.filter(todo => !todo.completed);
+
+  const isCompletedTodos = todos.some(todo => todo.completed);
+
+  const cleanCompletedTodos = () => {
+    setTodos(todos.filter(todo => !todo.completed));
+  };
+
+  return (
+    <footer className="footer" data-cy="todosFilter">
+      <span className="todo-count" data-cy="todosCounter">
+        {`${TotalUncompletedTodos.length} ${TotalUncompletedTodos.length === 1 ? 'item' : 'items'} left`}
+      </span>
+
+      <ul className="filters">
+        <li>
+          <a
+            href="#/"
+            className={cn({
+              selected: filter === Option.All,
+            })}
+            onClick={() => setFilter(Option.All)}
+          >
+            All
+          </a>
+        </li>
+
+        <li>
+          <a
+            href="#/active"
+            className={cn({
+              selected: filter === Option.Active,
+            })}
+            onClick={() => setFilter(Option.Active)}
+          >
+            Active
+          </a>
+        </li>
+
+        <li>
+          <a
+            href="#/completed"
+            className={cn({
+              selected: filter === Option.Completed,
+            })}
+            onClick={() => setFilter(Option.Completed)}
+          >
+            Completed
+          </a>
+        </li>
+      </ul>
+      {isCompletedTodos && (
+        <button
+          type="button"
+          className="clear-completed"
+          onClick={cleanCompletedTodos}
+        >
+          Clear completed
+        </button>
+      )}
+    </footer>
+  );
+};

src/components/Header.tsx

@@ -0,0 +1,45 @@
+import React, { useCallback, useContext, useState } from 'react';
+import { TodosContext } from '../TodosContext';
+import { Todo } from '../types/Todo';
+
+export const Header: React.FC = () => {
+  const { todos, setTodos, setIsToggleCheckedAll } = useContext(TodosContext);
+  const [title, setTitle] = useState('');
+
+  const handleSubmit = useCallback((
+    event: React.FormEvent<HTMLFormElement>,
+  ) => {
+    event.preventDefault();
+
+    if (!title.trim()) {
+      return;
+    }
+
+    const newTodo: Todo = {
+      id: +new Date(),
+      title: title.trim(),
+      completed: false,
+    };
+
+    setTodos([...todos, newTodo]);
+    setTitle('');
+    setIsToggleCheckedAll(false);
+  }, [setIsToggleCheckedAll, setTodos, title, todos]);
+
+  return (
+    <header className="header">
+      <h1>todos</h1>
+
+      <form onSubmit={handleSubmit}>
+        <input
+          type="text"
+          data-cy="createTodo"
+          className="new-todo"
+          placeholder="What needs to be done?"
+          value={title}
+          onChange={event => setTitle(event.target.value)}
+        />
+      </form>
+    </header>
+  );
+};

src/components/Main.tsx

@@ -0,0 +1,41 @@
+/* eslint-disable jsx-a11y/control-has-associated-label */
+import React, { useContext } from 'react';
+import { TodosContext } from '../TodosContext';
+import { TodoList } from './TodoList';
+
+export const Main: React.FC = () => {
+  const {
+    todos,
+    setTodos,
+    visibleTodos,
+    isToggleCheckedAll,
+    setIsToggleCheckedAll,
+  } = useContext(TodosContext);
+
+  const checkAllTodos = () => {
+    const newTodos = todos.map(todo => (
+      isToggleCheckedAll
+        ? { ...todo, completed: false }
+        : { ...todo, completed: true }
+    ));
+
+    setTodos(newTodos);
+    setIsToggleCheckedAll(!isToggleCheckedAll);
+  };
+
+  return (
+    <section className="main">
+      <input
+        type="checkbox"
+        id="toggle-all"
+        className="toggle-all"
+        data-cy="toggleAll"
+        checked={isToggleCheckedAll}
+        onChange={checkAllTodos}
+      />
+      <label htmlFor="toggle-all">Mark all as complete</label>
+
+      <TodoList items={visibleTodos} />
+    </section>
+  );
+};

src/components/TodoApp.tsx

@@ -0,0 +1,23 @@
+import React, { useContext } from 'react';
+import { Header } from './Header';
+import { Main } from './Main';
+import { Footer } from './Footer';
+import { TodosContext } from '../TodosContext';
+
+export const TodoApp: React.FC = () => {
+  const { todos } = useContext(TodosContext);
+
+  return (
+    <div className="todoapp">
+      <Header />
+
+      {!!todos.length && (
+        <>
+          <Main />
+
+          <Footer />
+        </>
+      )}
+    </div>
+  );
+};