add solution

src/App.tsx

@@ -1,156 +1,83 @@
 /* eslint-disable jsx-a11y/control-has-associated-label */
-import React from 'react';
+import React, { useContext, useEffect } from 'react';
+import { Todo } from './types/Todo';
+import { Footer } from './components/Footer';
+import { Header } from './components/Header';
+import { TodoList } from './components/TodoList';
+import { StateContext, DispatchContext } from './components/TodoProvider';
 
 export const App: React.FC = () => {
-  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>
+  const [query, setQuery] = React.useState('');
+  const [sortBy, setSortBy] = React.useState('all');
 
-            {/* Remove button appears only on hover */}
-            <button type="button" className="todo__remove" data-cy="TodoDelete">
-              ×
-            </button>
-          </div>
+  // Використовуємо окремі контексти для стану та діспатчу
+  const { todos } = useContext(StateContext);
+  const dispatch = useContext(DispatchContext);
 
-          {/* 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>
+  const inputRef = React.useRef<HTMLInputElement>(null);
 
-            <span data-cy="TodoTitle" className="todo__title">
-              Not Completed Todo
-            </span>
+  useEffect(() => {
+    localStorage.setItem('todos', JSON.stringify(todos));
+  }, [todos]);
 
-            <button type="button" className="todo__remove" data-cy="TodoDelete">
-              ×
-            </button>
-          </div>
+  useEffect(() => {
+    inputRef.current?.focus();
+  }, []);
 
-          {/* 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>
+  const filteredTodos = React.useMemo(() => {
+    switch (sortBy) {
+      case 'active':
+        return todos.filter(t => !t.completed);
+      case 'completed':
+        return todos.filter(t => t.completed);
+      default:
+        return todos;
+    }
+  }, [todos, sortBy]);
 
-            {/* 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>
+  const changeInputValue = (e: React.ChangeEvent<HTMLInputElement>) => {
+    setQuery(e.target.value);
+  };
 
-          {/* 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>
+  const deleteTodo = (todo: Todo) => {
+    dispatch({ type: 'DELETE', payload: todo.id });
+    inputRef.current?.focus();
+  };
 
-            <span data-cy="TodoTitle" className="todo__title">
-              Todo is being saved now
-            </span>
+  const changeCompletedStatus = (todo: Todo) => {
+    dispatch({ type: 'CHANGE', payload: todo.id });
+  };
 
-            <button type="button" className="todo__remove" data-cy="TodoDelete">
-              ×
-            </button>
-          </div>
-        </section>
+  const completedTodos = todos.filter(t => t.completed);
 
-        {/* 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>
+  return (
+    <div className="todoapp">
+      <h1 className="todoapp__title">todos</h1>
 
-          {/* 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 className="todoapp__content">
+        <Header
+          todos={todos}
+          dispatch={dispatch}
+          completedTodo={completedTodos}
+          query={query}
+          setQuery={setQuery}
+          inputRef={inputRef}
+          changeInputValue={changeInputValue}
+        />
+
+        <TodoList
+          filteredTodos={filteredTodos}
+          changeCompletedStatus={changeCompletedStatus}
+          deleteTodo={deleteTodo}
+          dispatch={dispatch}
+        />
+
+        <Footer
+          todos={todos}
+          sortBy={sortBy}
+          setSortBy={setSortBy}
+          deleteTodo={deleteTodo}
+        />
       </div>
     </div>
   );

src/components/Footer.tsx

@@ -0,0 +1,88 @@
+import React from 'react';
+import { Todo } from '../types/Todo';
+
+type Props = {
+  todos: Todo[];
+  sortBy: string;
+  setSortBy: (value: string) => void;
+};
+
+export const Footer: React.FC<Props> = ({
+  todos,
+  sortBy,
+  setSortBy,
+  deleteTodo,
+}) => {
+  const completedTodos: Todo[] = todos.filter(todo => todo.completed);
+
+  return (
+    <>
+      {todos.length > 0 && (
+        <footer className="todoapp__footer" data-cy="Footer">
+          <span className="todo-count" data-cy="TodosCounter">
+            {todos.filter(todo => !todo.completed).length} items left
+          </span>
+
+          {/* Active link should have the 'selected' class */}
+          <nav className="filter" data-cy="Filter">
+            <a
+              href="#/"
+              // className="filter__link selected"
+              className={
+                sortBy === 'all' ? 'filter__link selected' : 'filter__link'
+              }
+              data-cy="FilterLinkAll"
+              onClick={() => {
+                setSortBy('all');
+              }}
+            >
+              All
+            </a>
+
+            <a
+              href="#/active"
+              className={
+                sortBy === 'active' ? 'filter__link selected' : 'filter__link'
+              }
+              data-cy="FilterLinkActive"
+              onClick={() => {
+                setSortBy('active');
+              }}
+            >
+              Active
+            </a>
+
+            <a
+              href="#/completed"
+              className={
+                sortBy === 'completed'
+                  ? 'filter__link selected'
+                  : 'filter__link'
+              }
+              data-cy="FilterLinkCompleted"
+              onClick={() => {
+                setSortBy('completed');
+              }}
+            >
+              Completed
+            </a>
+          </nav>
+
+          <button
+            type="button"
+            className="todoapp__clear-completed"
+            data-cy="ClearCompletedButton"
+            disabled={completedTodos.length === 0}
+            onClick={() => {
+              completedTodos.forEach(t => {
+                deleteTodo(t);
+              });
+            }}
+          >
+            Clear completed
+          </button>
+        </footer>
+      )}
+    </>
+  );
+};

src/components/Header.tsx

@@ -0,0 +1,67 @@
+import React from 'react';
+import { Todo } from '../types/Todo';
+import { Action } from './TodoProvider';
+
+type Props = {
+  todos: Todo[];
+  dispatch: React.Dispatch<Action>;
+  completedTodo: Todo[];
+  query: string;
+  setQuery: React.Dispatch<React.SetStateAction<string>>;
+  inputRef: React.RefObject<HTMLInputElement>;
+  changeInputValue: (event: React.ChangeEvent<HTMLInputElement>) => void;
+};
+
+export const Header: React.FC<Props> = ({
+  todos,
+  dispatch,
+  completedTodo,
+  query,
+  setQuery,
+  inputRef,
+  changeInputValue,
+}) => {
+  const addTodo = (e: React.FormEvent) => {
+    e.preventDefault();
+
+    const trimmedQuery = query.trim();
+
+    if (trimmedQuery) {
+      dispatch({
+        type: 'ADD',
+        payload: trimmedQuery,
+      });
+      setQuery('');
+    }
+  };
+
+  const isAllCompleted =
+    todos.length > 0 && completedTodo.length === todos.length;
+
+  return (
+    <header className="todoapp__header">
+      {todos.length > 0 && (
+        <button
+          type="button"
+          className={`todoapp__toggle-all ${isAllCompleted ? 'active' : ''}`}
+          data-cy="ToggleAllButton"
+          onClick={() => dispatch({ type: 'TOGGLE_ALL' })}
+        />
+      )}
+
+      <form onSubmit={addTodo}>
+        <input
+          data-cy="NewTodoField"
+          type="text"
+          ref={inputRef}
+          value={query}
+          className="todoapp__new-todo"
+          placeholder="What needs to be done?"
+          onChange={changeInputValue}
+        />
+      </form>
+    </header>
+  );
+};
+
+export default Header;