solution

src/App.tsx

@@ -1,26 +1,129 @@
-/* eslint-disable max-len */
+/* eslint-disable jsx-a11y/label-has-associated-control */
 /* eslint-disable jsx-a11y/control-has-associated-label */
-import React from 'react';
-import { UserWarning } from './UserWarning';
-
-const USER_ID = 0;
+import React, { useEffect, useRef, useState } from 'react';
+import { deleteTodos, getTodos, patchTodos } from './api/todos';
+import { Todo } from './types/Todo';
+import { Filter } from './types/Filter';
+import { Error } from './types/Error';
+import { ErrorNotification } from './components/ErrorNotification';
+import { removeTodoById } from './utils/removeTodoById';
+import { TodoList } from './components/TodoList';
+import { Header } from './components/Header';
+import { Footer } from './components/Footer';
 
 export const App: React.FC = () => {
-  if (!USER_ID) {
-    return <UserWarning />;
+  const [todos, setTodos] = useState<Todo[]>([]);
+  const [errorMessage, setErrorMessage] = useState<Error>(Error.Default);
+  const [activeFilter, setActiveFilter] = useState<Filter>(Filter.All);
+  const [tempTodo, setTempTodo] = useState<Todo | null>(null);
+  const [loadingTodoIds, setLoadingTodoIds] = useState<number[]>([]);
+
+  const addTodoField = useRef<HTMLInputElement>(null);
+  const errorTimeoutRef = useRef<ReturnType<typeof setTimeout> | null>(null);
+
+  function showError(message: Error) {
+    if (errorTimeoutRef.current) {
+      clearTimeout(errorTimeoutRef.current);
+    }
+
+    setErrorMessage(message);
+    errorTimeoutRef.current = setTimeout(
+      () => setErrorMessage(Error.Default),
+      3000,
+    );
+  }
+
+  function handleTodoStatusChange(id: number, newStatus: boolean) {
+    setLoadingTodoIds(prev => [...prev, id]);
+    const updateStatus = { completed: newStatus };
+
+    return patchTodos(id, updateStatus)
+      .then(fetchedTodo => {
+        setTodos(prevTodos =>
+          prevTodos.map(todo =>
+            todo.id === fetchedTodo.id ? fetchedTodo : todo,
+          ),
+        );
+      })
+      .catch(() => showError(Error.UpdateError))
+      .finally(() => {
+        setLoadingTodoIds(prev => prev.filter(idParametr => idParametr !== id));
+      });
+  }
+
+  function setFocusOnAddInput() {
+    if (addTodoField.current !== null) {
+      addTodoField.current.focus();
+    }
+  }
+
+  useEffect(() => {
+    getTodos()
+      .then(fetchedTodos => {
+        setTodos(fetchedTodos);
+        setFocusOnAddInput();
+      })
+      .catch(() => showError(Error.LoadError));
+  }, []);
+
+  useEffect(() => {
+    if (!tempTodo) {
+      setFocusOnAddInput();
+    }
+  }, [tempTodo]);
+
+  function onDelete(id: number): Promise<void> {
+    return deleteTodos(id)
+      .then(() => {
+        setTodos(prevTodos => removeTodoById(prevTodos, id));
+      })
+      .catch(() => showError(Error.DeleteError));
   }
 
   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">
+        <Header
+          todos={todos}
+          handleTodoStatusChange={handleTodoStatusChange}
+          showError={showError}
+          setTodos={setTodos}
+          setTempTodo={setTempTodo}
+          addTodoField={addTodoField}
+          tempTodo={tempTodo}
+        />
+
+        <TodoList
+          todos={todos}
+          activeFilter={activeFilter}
+          handleTodoStatusChange={handleTodoStatusChange}
+          onDelete={onDelete}
+          loadingTodoIds={loadingTodoIds}
+          setLoadingTodoIds={setLoadingTodoIds}
+          addTodoField={addTodoField}
+          tempTodo={tempTodo}
+          setTodos={setTodos}
+          showError={showError}
+        />
+
+        {todos.length !== 0 && (
+          <Footer
+            todos={todos}
+            activeFilter={activeFilter}
+            setActiveFilter={setActiveFilter}
+            setLoadingTodoIds={setLoadingTodoIds}
+            onDelete={onDelete}
+            setFocusOnAddInput={setFocusOnAddInput}
+          />
+        )}
+      </div>
+
+      <ErrorNotification
+        errorMessage={errorMessage}
+        setErrorMessage={setErrorMessage}
+      />
+    </div>
   );
 };

src/api/todos.ts

@@ -0,0 +1,23 @@
+import { Todo } from '../types/Todo';
+import { client } from '../utils/fetchClient';
+
+export const USER_ID = 2148;
+
+export const getTodos = () => {
+  return client.get<Todo[]>(`/todos?userId=${USER_ID}`);
+};
+
+export const patchTodos = (
+  Id: number | null,
+  updateProperty: { title: string } | { completed: boolean },
+) => {
+  return client.patch<Todo>(`/todos/${Id}`, updateProperty);
+};
+
+export const postTodos = (newTodo: Todo) => {
+  return client.post<Todo>(`/todos`, newTodo);
+};
+
+export const deleteTodos = (id: number) => {
+  return client.delete(`/todos/${id}`);
+};

src/components/ErrorNotification/ErrorNotification.tsx

@@ -0,0 +1,33 @@
+/* eslint-disable jsx-a11y/label-has-associated-control */
+/* eslint-disable jsx-a11y/control-has-associated-label */
+import React, { Dispatch, SetStateAction } from 'react';
+import cN from 'classnames';
+import { Error } from '../../types/Error';
+
+type Props = {
+  errorMessage: Error;
+  setErrorMessage: Dispatch<SetStateAction<Error>>;
+};
+
+export const ErrorNotification: React.FC<Props> = ({
+  errorMessage,
+  setErrorMessage,
+}) => {
+  return (
+    <div
+      data-cy="ErrorNotification"
+      className={cN('notification is-danger is-light has-text-weight-normal', {
+        hidden: errorMessage === Error.Default,
+      })}
+    >
+      <button
+        onClick={() => setErrorMessage(Error.Default)}
+        data-cy="HideErrorButton"
+        type="button"
+        className="delete"
+      />
+      {/* show only one message at a time +++*/}
+      {errorMessage}
+    </div>
+  );
+};

src/components/ErrorNotification/index.ts

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

src/components/Footer/Footer.tsx

@@ -0,0 +1,88 @@
+import { Dispatch, SetStateAction, useMemo } from 'react';
+import { Todo } from '../../types/Todo';
+import { Filter } from '../../types/Filter';
+import cN from 'classnames';
+
+type Props = {
+  todos: Todo[];
+  activeFilter: Filter;
+  setActiveFilter: Dispatch<SetStateAction<Filter>>;
+  setLoadingTodoIds: Dispatch<SetStateAction<number[]>>;
+  onDelete: (id: number) => Promise<void>;
+  setFocusOnAddInput: () => void;
+};
+
+const filterValues = Object.values(Filter);
+
+export const Footer: React.FC<Props> = ({
+  todos,
+  activeFilter,
+  setActiveFilter,
+  setLoadingTodoIds,
+  onDelete,
+  setFocusOnAddInput,
+}) => {
+  const activeCount: number = useMemo(() => {
+    return todos.reduce((acc, todo) => {
+      if (todo.completed === false) {
+        return acc + 1;
+      }
+
+      return acc;
+    }, 0);
+  }, [todos]);
+
+  const hasCompleted = useMemo(() => {
+    return todos.some(todo => todo.completed === true);
+  }, [todos]);
+
+  function handleClearCompleted() {
+    const completedTodoIds = todos.reduce(
+      (acc, todo) => (todo.completed ? [...acc, todo.id] : acc),
+      [] as number[],
+    );
+
+    setLoadingTodoIds(completedTodoIds);
+
+    const promises = completedTodoIds.map(id => onDelete(id));
+
+    Promise.all(promises).then(() => {
+      setFocusOnAddInput();
+    });
+  }
+
+  return (
+    <footer className="todoapp__footer" data-cy="Footer">
+      <span className="todo-count" data-cy="TodosCounter">
+        {activeCount} items left
+      </span>
+
+      <nav className="filter" data-cy="Filter">
+        {filterValues.map(filter => {
+          return (
+            <a
+              key={filter}
+              href={`#/${filter === 'All' ? '' : filter}`}
+              className={cN('filter__link', {
+                selected: activeFilter === filter,
+              })}
+              data-cy={`FilterLink${filter}`}
+              onClick={() => setActiveFilter(filter)}
+            >
+              {filter}
+            </a>
+          );
+        })}
+      </nav>
+      <button
+        type="button"
+        className="todoapp__clear-completed"
+        data-cy="ClearCompletedButton"
+        disabled={!hasCompleted}
+        onClick={handleClearCompleted}
+      >
+        Clear completed
+      </button>
+    </footer>
+  );
+};

src/components/Footer/index.ts

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