add solution

README.md

@@ -33,4 +33,4 @@ Implement a simple [TODO app](https://mate-academy.github.io/react_todo-app/) th
 - Implement a solution following the [React task guidelines](https://github.com/mate-academy/react_task-guideline#react-tasks-guideline).
 - Use the [React TypeScript cheat sheet](https://mate-academy.github.io/fe-program/js/extra/react-typescript).
 - Open another terminal and run tests with `npm test` to ensure your solution is correct.
-- Replace `<your_account>` with your GitHub username in the [DEMO LINK](https://<your_account>.github.io/react_todo-app/) and add it to the PR description.
+- Replace `<your_account>` with your GitHub username in the [DEMO LINK](https://associate2coder.github.io/react_todo-app/) and add it to the PR description.

src/App.tsx

@@ -1,156 +1,20 @@
 /* eslint-disable jsx-a11y/control-has-associated-label */
 import React from 'react';
+import { Footer } from './components/Footer';
+import { Header } from './components/Header';
+import { TodoList } from './components/TodoList';
 
 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"
-          />
+        <Header />
 
-          {/* 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>
+        <TodoList />
 
-        <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>
+        <Footer />
       </div>
     </div>
   );

src/components/Filter.tsx

@@ -0,0 +1,42 @@
+import cn from 'classnames';
+
+import { FilterOption } from '../types/FilterOption';
+import { useCallback, useContext } from 'react';
+import { StateContext } from '../context/GlobalContextProvider';
+import { DispatchContext } from '../context/GlobalContextProvider';
+
+export const Filter: React.FC = () => {
+  const { filter } = useContext(StateContext);
+  const dispatch = useContext(DispatchContext);
+
+  const handleFilterSelection = useCallback(
+    (option: FilterOption) =>
+      dispatch({
+        type: 'setFilter',
+        payload: option,
+      }),
+    [dispatch],
+  );
+
+  return (
+    <nav className="filter" data-cy="Filter">
+      {Object.values(FilterOption).map(curOption => {
+        const capitalizedFilter = `${curOption.charAt(0).toUpperCase()}${curOption.substring(1)}`;
+
+        return (
+          <a
+            key={curOption}
+            href={`#/${curOption === 'all' ? '' : curOption}`}
+            className={cn('filter__link', {
+              selected: filter === curOption,
+            })}
+            data-cy={`FilterLink${capitalizedFilter}`}
+            onClick={() => handleFilterSelection(curOption)}
+          >
+            {capitalizedFilter}
+          </a>
+        );
+      })}
+    </nav>
+  );
+};

src/components/Footer.tsx

@@ -0,0 +1,46 @@
+import { useCallback, useContext, useMemo } from 'react';
+import { Filter } from './Filter';
+import { StateContext } from '../context/GlobalContextProvider';
+import { DispatchContext } from '../context/GlobalContextProvider';
+
+export const Footer: React.FC = () => {
+  const { todos } = useContext(StateContext);
+  const dispatch = useContext(DispatchContext);
+
+  const [todoCount, completedTodoCount, activeTodoCount] = useMemo(() => {
+    const allCount = todos.length;
+    const completedCount = todos.filter(todo => todo.completed).length;
+    const activeCount = allCount - completedCount;
+
+    return [allCount, completedCount, activeCount];
+  }, [todos]);
+
+  const handleClearCompleted = useCallback(() => {
+    dispatch({
+      type: 'setTodos',
+      payload: todos.filter(todo => !todo.completed),
+    });
+  }, [dispatch, todos]);
+
+  return (
+    !!todoCount && (
+      <footer className="todoapp__footer" data-cy="Footer">
+        <span className="todo-count" data-cy="TodosCounter">
+          {`${activeTodoCount} items left`}
+        </span>
+
+        <Filter />
+
+        <button
+          type="button"
+          className="todoapp__clear-completed"
+          disabled={!completedTodoCount} //disabled if there are no completed todos
+          onClick={handleClearCompleted}
+          data-cy="ClearCompletedButton"
+        >
+          Clear completed
+        </button>
+      </footer>
+    )
+  );
+};

src/components/Header.tsx

@@ -0,0 +1,44 @@
+import cn from 'classnames';
+
+import { useCallback, useContext, useMemo } from 'react';
+import { NewTodoForm } from './NewTodoForm';
+import { StateContext } from '../context/GlobalContextProvider';
+import { DispatchContext } from '../context/GlobalContextProvider';
+
+export const Header: React.FC = () => {
+  const { todos } = useContext(StateContext);
+  const dispatch = useContext(DispatchContext);
+
+  const toggleAllBtnShown = useMemo(() => todos.length !== 0, [todos.length]);
+  const toggleAllBtnActive = useMemo(
+    () => todos.every(todo => todo.completed),
+    [todos],
+  );
+
+  const handleToggleAllTodos = useCallback(() => {
+    const newStatus = todos.some(todo => !todo.completed);
+
+    const updatedTodos = todos.map(todo => {
+      return todo.completed === newStatus
+        ? todo
+        : { ...todo, completed: newStatus };
+    });
+
+    dispatch({ type: 'setTodos', payload: updatedTodos });
+  }, [dispatch, todos]);
+
+  return (
+    <header className="todoapp__header">
+      {toggleAllBtnShown && (
+        <button
+          type="button"
+          className={cn('todoapp__toggle-all', { active: toggleAllBtnActive })}
+          onClick={handleToggleAllTodos}
+          data-cy="ToggleAllButton"
+        />
+      )}
+
+      <NewTodoForm />
+    </header>
+  );
+};

src/components/NewTodoForm.tsx

@@ -0,0 +1,61 @@
+import { useCallback, useContext, useEffect, useRef, useState } from 'react';
+import { todoService } from '../services/todoService';
+import { DispatchContext } from '../context/GlobalContextProvider';
+import { StateContext } from '../context/GlobalContextProvider';
+
+export const NewTodoForm: React.FC = () => {
+  const dispatch = useContext(DispatchContext);
+  const { todos } = useContext(StateContext);
+
+  const [title, setTitle] = useState('');
+  const inputElementRef = useRef<HTMLInputElement>(null);
+
+  // handling return of focus to the Form when todos change
+  useEffect(() => {
+    inputElementRef.current?.focus();
+  }, [todos]);
+
+  // Handle Form submit
+  const handleSubmit = useCallback(
+    (e: React.FormEvent) => {
+      e.preventDefault();
+
+      const inputElement = inputElementRef.current;
+
+      if (inputElement) {
+        inputElement.disabled = true; // disable while
+
+        const trimmedTitle = title.trim();
+
+        // If there is a title, form submited and field cleared
+        if (trimmedTitle) {
+          dispatch({
+            type: 'addTodo',
+            payload: todoService.create(trimmedTitle),
+          });
+          setTitle('');
+        }
+
+        // When submitted or title is empty, form enabled and focused
+        inputElement.disabled = false;
+        inputElement.focus();
+      }
+    },
+    [dispatch, title],
+  );
+
+  return (
+    <form onSubmit={handleSubmit}>
+      <input
+        data-cy="NewTodoField"
+        type="text"
+        ref={inputElementRef}
+        value={title}
+        className="todoapp__new-todo"
+        placeholder="What needs to be done?"
+        onChange={e => setTitle(e.target.value)}
+        autoFocus
+      />
+    </form>
+  );
+};