Implement ToDo App

src/App.tsx

@@ -1,157 +1,23 @@
-/* eslint-disable jsx-a11y/control-has-associated-label */
-import React from 'react';
+import React, { useContext } from 'react';
+
+import { Title } from './components/App/Title';
+import { Content } from './components/App/Content';
+import { Header } from './components/Header';
+import { Main } from './components/Main';
+import { Footer } from './components/Footer';
+import { TodoContext } from './context/TodoContext';
 
 export const App: React.FC = () => {
+  const todos = useContext(TodoContext);
+
   return (
     <div className="todoapp">
-      <h1 className="todoapp__title">todos</h1>
-
-      <div className="todoapp__content">
-        <header className="todoapp__header">
-          {/* this button should have `active` class only if all todos are completed */}
-          <button
-            type="button"
-            className="todoapp__toggle-all active"
-            data-cy="ToggleAllButton"
-          />
-
-          {/* Add a todo on form submit */}
-          <form>
-            <input
-              data-cy="NewTodoField"
-              type="text"
-              className="todoapp__new-todo"
-              placeholder="What needs to be done?"
-            />
-          </form>
-        </header>
-
-        <section className="todoapp__main" data-cy="TodoList">
-          {/* This is a completed todo */}
-          <div data-cy="Todo" className="todo completed">
-            <label className="todo__status-label">
-              <input
-                data-cy="TodoStatus"
-                type="checkbox"
-                className="todo__status"
-                checked
-              />
-            </label>
-
-            <span data-cy="TodoTitle" className="todo__title">
-              Completed Todo
-            </span>
-
-            {/* Remove button appears only on hover */}
-            <button type="button" className="todo__remove" data-cy="TodoDelete">
-              ×
-            </button>
-          </div>
-
-          {/* This todo is an active todo */}
-          <div data-cy="Todo" className="todo">
-            <label className="todo__status-label">
-              <input
-                data-cy="TodoStatus"
-                type="checkbox"
-                className="todo__status"
-              />
-            </label>
-
-            <span data-cy="TodoTitle" className="todo__title">
-              Not Completed Todo
-            </span>
-
-            <button type="button" className="todo__remove" data-cy="TodoDelete">
-              ×
-            </button>
-          </div>
-
-          {/* This todo is being edited */}
-          <div data-cy="Todo" className="todo">
-            <label className="todo__status-label">
-              <input
-                data-cy="TodoStatus"
-                type="checkbox"
-                className="todo__status"
-              />
-            </label>
-
-            {/* This form is shown instead of the title and remove button */}
-            <form>
-              <input
-                data-cy="TodoTitleField"
-                type="text"
-                className="todo__title-field"
-                placeholder="Empty todo will be deleted"
-                value="Todo is being edited now"
-              />
-            </form>
-          </div>
-
-          {/* This todo is in loadind state */}
-          <div data-cy="Todo" className="todo">
-            <label className="todo__status-label">
-              <input
-                data-cy="TodoStatus"
-                type="checkbox"
-                className="todo__status"
-              />
-            </label>
-
-            <span data-cy="TodoTitle" className="todo__title">
-              Todo is being saved now
-            </span>
-
-            <button type="button" className="todo__remove" data-cy="TodoDelete">
-              ×
-            </button>
-          </div>
-        </section>
-
-        {/* Hide the footer if there are no todos */}
-        <footer className="todoapp__footer" data-cy="Footer">
-          <span className="todo-count" data-cy="TodosCounter">
-            3 items left
-          </span>
-
-          {/* Active link should have the 'selected' class */}
-          <nav className="filter" data-cy="Filter">
-            <a
-              href="#/"
-              className="filter__link selected"
-              data-cy="FilterLinkAll"
-            >
-              All
-            </a>
-
-            <a
-              href="#/active"
-              className="filter__link"
-              data-cy="FilterLinkActive"
-            >
-              Active
-            </a>
-
-            <a
-              href="#/completed"
-              className="filter__link"
-              data-cy="FilterLinkCompleted"
-            >
-              Completed
-            </a>
-          </nav>
-
-          {/* this button should be disabled if there are no completed todos */}
-          <button
-            type="button"
-            className="todoapp__clear-completed"
-            data-cy="ClearCompletedButton"
-          >
-            Clear completed
-          </button>
-        </footer>
-      </div>
+      <Title />
+      <Content>
+        <Header />
+        <Main />
+        {todos?.length !== 0 && <Footer />}
+      </Content>
     </div>
   );
 };

src/components/App/Content.tsx

@@ -0,0 +1,11 @@
+import React from 'react';
+
+type Props = {
+  children: React.ReactNode;
+};
+
+const ContentBase: React.FC<Props> = ({ children }) => {
+  return <div className="todoapp__content">{children}</div>;
+};
+
+export const Content = React.memo(ContentBase);

src/components/App/Title.tsx

@@ -0,0 +1,7 @@
+import React from 'react';
+
+const TitleBase: React.FC = () => {
+  return <div className="todoapp__title">todos</div>;
+};
+
+export const Title = React.memo(TitleBase);

src/components/Footer/Footer.tsx

@@ -0,0 +1,67 @@
+import React from 'react';
+import cn from 'classnames';
+
+import { useTodos } from '../../hooks/useTodos';
+import { useTodosView } from '../../hooks/useTodosView';
+
+type Props = {};
+
+const FooterBase: React.FC<Props> = () => {
+  const { uncompletedTodos, completedTodos, clearCompletedTodos } = useTodos();
+  const { filter, setFilter } = useTodosView();
+
+  return (
+    <footer className="todoapp__footer" data-cy="Footer">
+      <span className="todo-count" data-cy="TodosCounter">
+        {uncompletedTodos.length} items left
+      </span>
+
+      <nav className="filter" data-cy="Filter">
+        <a
+          onClick={() => setFilter('all')}
+          href="#/"
+          className={cn('filter__link', {
+            selected: filter === 'all',
+          })}
+          data-cy="FilterLinkAll"
+        >
+          All
+        </a>
+
+        <a
+          onClick={() => setFilter('active')}
+          href="#/active"
+          className={cn('filter__link', {
+            selected: filter === 'active',
+          })}
+          data-cy="FilterLinkActive"
+        >
+          Active
+        </a>
+
+        <a
+          onClick={() => setFilter('completed')}
+          href="#/completed"
+          className={cn('filter__link', {
+            selected: filter === 'completed',
+          })}
+          data-cy="FilterLinkCompleted"
+        >
+          Completed
+        </a>
+      </nav>
+
+      <button
+        type="button"
+        className="todoapp__clear-completed"
+        data-cy="ClearCompletedButton"
+        disabled={completedTodos.length === 0}
+        onClick={clearCompletedTodos}
+      >
+        Clear completed
+      </button>
+    </footer>
+  );
+};
+
+export const Footer = React.memo(FooterBase);

src/components/Footer/index.ts

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

src/components/Header/Header.tsx

@@ -0,0 +1,61 @@
+import React, { useEffect, useRef, useState } from 'react';
+import cn from 'classnames';
+
+import { useTodos } from '../../hooks/useTodos';
+
+type Props = {};
+
+const HeaderBase: React.FC<Props> = () => {
+  const { toggleAllTodos, completedTodos, todos, addTodo } = useTodos();
+  const [title, setTitle] = useState('');
+
+  const newTodoFieldRef = useRef<HTMLInputElement | null>(null);
+
+  const handleSubmit = (e: React.FormEvent<HTMLFormElement>) => {
+    e.preventDefault();
+    const titleToSave = title.trim();
+
+    if (titleToSave !== '') {
+      addTodo(titleToSave);
+      setTitle('');
+    }
+  };
+
+  const handleTitleChange = (e: React.ChangeEvent<HTMLInputElement>) => {
+    setTitle(e.target.value);
+  };
+
+  useEffect(() => {
+    if (newTodoFieldRef.current) {
+      newTodoFieldRef.current.focus();
+    }
+  }, [todos.length]);
+
+  return (
+    <header className="todoapp__header">
+      {todos.length !== 0 && (
+        <button
+          onClick={toggleAllTodos}
+          type="button"
+          className={cn('todoapp__toggle-all', {
+            active: todos.length === completedTodos.length,
+          })}
+          data-cy="ToggleAllButton"
+        />
+      )}
+      <form onSubmit={handleSubmit}>
+        <input
+          ref={newTodoFieldRef}
+          value={title}
+          onChange={handleTitleChange}
+          data-cy="NewTodoField"
+          type="text"
+          className="todoapp__new-todo"
+          placeholder="What needs to be done?"
+        />
+      </form>
+    </header>
+  );
+};
+
+export const Header = React.memo(HeaderBase);

src/components/Header/index.ts

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

src/components/Main/Main.tsx

@@ -0,0 +1,14 @@
+import React from 'react';
+import { TodoList } from '../TodoList';
+
+type Props = {};
+
+const MainBase: React.FC<Props> = () => {
+  return (
+    <section className="todoapp__main" data-cy="TodoList">
+      <TodoList />
+    </section>
+  );
+};
+
+export const Main = React.memo(MainBase);

src/components/Main/index.ts

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