add task solution

src/App.tsx

@@ -1,26 +1,259 @@
-/* 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 React, {
+  useCallback,
+  useEffect,
+  useState,
+  useMemo,
+  useRef,
+} from 'react';
 import { UserWarning } from './UserWarning';
+import { getTodos, USER_ID } from './api/api';
+import * as todoService from './api/api';
 
-const USER_ID = 0;
+import { Todo } from './types/Todo';
+import { Filter } from './types/Filter';
+
+import { Header } from './components/Header';
+import { TodoList } from './components/TodoLIst';
+import { Footer } from './components/Footer';
+import { Notification } from './components/Notification';
 
 export const App: React.FC = () => {
+  const [todosFromServer, setTodosFromServer] = useState<Todo[]>([]);
+  const [filter, setFilter] = useState<Filter>(Filter.All);
+  const [tempTodo, setTempTodo] = useState<Todo | null>(null);
+  const [loadingTodoIds, setLoadingTodoIds] = useState<number[]>([]);
+  const [notification, setNotification] = useState({
+    isHidden: true,
+    message: '',
+  });
+
+  const inputRef = useRef<HTMLInputElement>(null);
+
+  const showNotification = (message: string) => {
+    setNotification({ isHidden: false, message });
+    setTimeout(() => setNotification({ isHidden: true, message: '' }), 3000);
+  };
+
+  const filterTodos = useCallback((todos: Todo[], filterBy: Filter): Todo[] => {
+    switch (filterBy) {
+      case Filter.Completed:
+        return todos.filter(todo => todo.completed);
+
+      case Filter.Active:
+        return todos.filter(todo => !todo.completed);
+
+      default:
+        return todos;
+    }
+  }, []);
+
+  const visibleTodos = useMemo(
+    () => filterTodos(todosFromServer, filter),
+    [filterTodos, todosFromServer, filter],
+  );
+
+  const activeTodosCount = useMemo(
+    () => todosFromServer.filter(todo => !todo.completed).length,
+    [todosFromServer],
+  );
+
+  const allTodosCompleted = useMemo(
+    () => activeTodosCount === 0,
+    [activeTodosCount],
+  );
+
+  const hasCompletedTodos = useMemo(
+    () => todosFromServer.some(todo => todo.completed),
+    [todosFromServer],
+  );
+
+  const handleAddTodo = (title: string) => {
+    setNotification({ isHidden: true, message: '' });
+
+    const trimmedTitle = title.trim();
+
+    if (!trimmedTitle.length) {
+      showNotification('Title should not be empty');
+
+      return Promise.reject('Title is empty');
+    }
+
+    setTempTodo({
+      title: trimmedTitle,
+      userId: USER_ID,
+      completed: false,
+      id: 0,
+    });
+
+    return todoService
+      .createTodo({ title: trimmedTitle, userId: USER_ID, completed: false })
+      .then(newTodo => {
+        setTodosFromServer(currentTodos => [...currentTodos, newTodo]);
+      })
+      .catch(error => {
+        showNotification('Unable to add a todo');
+        throw new Error(error);
+      })
+      .finally(() => {
+        setTempTodo(null);
+      });
+  };
+
+  const handleDeleteTodo = (todoId: number) => {
+    setLoadingTodoIds([todoId]);
+
+    return todoService
+      .deleteTodo(todoId)
+      .then(() => {
+        setTodosFromServer(curr => curr.filter(todo => todo.id !== todoId));
+      })
+      .catch(error => {
+        showNotification('Unable to delete a todo');
+        throw new Error(error);
+      })
+      .finally(() => {
+        setLoadingTodoIds([]);
+        if (inputRef.current) {
+          inputRef.current.focus();
+        }
+      });
+  };
+
+  const handleClearCompletedTodos = () => {
+    const completedTodoIds = todosFromServer
+      .filter(todo => todo.completed)
+      .map(todo => todo.id);
+
+    setLoadingTodoIds(completedTodoIds);
+    Promise.all(
+      completedTodoIds.map(id =>
+        todoService
+          .deleteTodo(id)
+          .then(() => {
+            setTodosFromServer(curr => curr.filter(todo => todo.id !== id));
+          })
+          .catch(error => {
+            showNotification('Unable to delete a todo');
+            throw new Error(error);
+          })
+          .finally(() => {
+            setLoadingTodoIds([]);
+            if (inputRef.current) {
+              inputRef.current.focus();
+            }
+          }),
+      ),
+    );
+  };
+
+  const handleUpdateTodo = (updatedTodo: Todo) => {
+    setLoadingTodoIds([updatedTodo.id]);
+
+    return todoService
+      .updateTodo(updatedTodo)
+      .then(receivedTodo => {
+        setTodosFromServer(curr =>
+          curr.map(todo => (todo.id === receivedTodo.id ? receivedTodo : todo)),
+        );
+      })
+      .catch(error => {
+        showNotification('Unable to update a todo');
+        throw new Error(error);
+      })
+      .finally(() => {
+        setLoadingTodoIds([]);
+      });
+  };
+
+  const handleToggleAllTodoStatus = () => {
+    let todosToChange = [];
+
+    if (allTodosCompleted) {
+      todosToChange = [...todosFromServer];
+    } else {
+      todosToChange = todosFromServer.filter(todo => !todo.completed);
+    }
+
+    const todoToChangeIds = todosToChange.map(todo => todo.id);
+
+    setLoadingTodoIds(todoToChangeIds);
+    Promise.all(
+      todosToChange.map(todoToChange => {
+        const { id, completed, title, userId } = todoToChange;
+
+        todoService
+          .updateTodo({ id, completed: !completed, title, userId })
+          .then(receivedTodo => {
+            setTodosFromServer(curr =>
+              curr.map(todo =>
+                todo.id === receivedTodo.id ? receivedTodo : todo,
+              ),
+            );
+          })
+          .catch(error => {
+            showNotification('Unable to update a todo');
+            throw new Error(error);
+          })
+          .finally(() => {
+            setLoadingTodoIds([]);
+          });
+      }),
+    );
+  };
+
+  useEffect(() => {
+    getTodos()
+      .then(setTodosFromServer)
+      .catch(() => {
+        showNotification('Unable to load todos');
+      });
+  }, []);
+
   if (!USER_ID) {
     return <UserWarning />;
   }
 
   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
+          inputRef={inputRef}
+          hasTodos={!!todosFromServer.length}
+          allCompletedTodos={allTodosCompleted}
+          onAddTodo={handleAddTodo}
+          onToggleAll={handleToggleAllTodoStatus}
+        />
+
+        {!!todosFromServer.length && (
+          <TodoList
+            todos={visibleTodos}
+            tempTodo={tempTodo}
+            onDeleteTodo={handleDeleteTodo}
+            loading={loadingTodoIds}
+            onUpdateTodo={handleUpdateTodo}
+          />
+        )}
+
+        {!!todosFromServer.length && (
+          <Footer
+            activeTodosCount={activeTodosCount}
+            currFilter={filter}
+            hasCompletedTodos={hasCompletedTodos}
+            onFilter={setFilter}
+            onClearCompletedTodos={handleClearCompletedTodos}
+          />
+        )}
+      </div>
+
+      <Notification
+        message={notification.message}
+        isHidden={notification.isHidden}
+        onClose={() => setNotification({ ...notification, isHidden: true })}
+      />
+    </div>
   );
 };

src/api/api.tsx

@@ -0,0 +1,22 @@
+import { Todo } from '../types/Todo';
+import { client } from '../utils/fetchClients';
+
+export const USER_ID = 2159;
+
+export const getTodos = () => {
+  return client.get<Todo[]>(`/todos?userId=${USER_ID}`);
+};
+
+export function createTodo({ title, userId, completed }: Omit<Todo, 'id'>) {
+  return client.post<Todo>(`/todos`, { title, userId, completed });
+}
+
+export function deleteTodo(todoId: number) {
+  return client.delete(`/todos/${todoId}`);
+}
+
+export function updateTodo(data: Todo): Promise<Todo> {
+  const { id } = data;
+
+  return client.patch(`/todos/${id}`, data);
+}

src/components/Footer.tsx

@@ -0,0 +1,57 @@
+import classNames from 'classnames';
+import { Filter } from '../types/Filter';
+
+type Props = {
+  activeTodosCount: number;
+  currFilter: Filter;
+  hasCompletedTodos: boolean;
+  onFilter: (newFilter: Filter) => void;
+  onClearCompletedTodos: () => void;
+};
+
+export const Footer: React.FC<Props> = ({
+  activeTodosCount,
+  currFilter,
+  hasCompletedTodos,
+  onFilter,
+  onClearCompletedTodos,
+}) => {
+  return (
+    <footer className="todoapp__footer" data-cy="Footer">
+      <span className="todo-count" data-cy="TodosCounter">
+        {`${activeTodosCount} items left`}
+      </span>
+
+      <nav className="filter" data-cy="Filter">
+        {Object.values(Filter).map(filter => {
+          const capitalizedFilter =
+            filter[0].toUpperCase() + filter.slice(1).toLowerCase();
+
+          return (
+            <a
+              key={filter}
+              href={`#/${filter === Filter.All ? '' : filter}`}
+              className={classNames('filter__link', {
+                selected: currFilter === filter,
+              })}
+              data-cy={`FilterLink${capitalizedFilter}`}
+              onClick={() => onFilter(filter)}
+            >
+              {capitalizedFilter}
+            </a>
+          );
+        })}
+      </nav>
+
+      <button
+        type="button"
+        className="todoapp__clear-completed"
+        data-cy="ClearCompletedButton"
+        onClick={onClearCompletedTodos}
+        disabled={!hasCompletedTodos}
+      >
+        Clear completed
+      </button>
+    </footer>
+  );
+};