add solution

src/App.tsx

@@ -1,26 +1,265 @@
-/* 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, { useEffect, useMemo, useRef, useState } from 'react';
 import { UserWarning } from './UserWarning';
 
-const USER_ID = 0;
+import {
+  addTodo,
+  deleteTodo,
+  getTodos,
+  updateTodo,
+  USER_ID,
+} from './api/todos';
+import { Todo } from './types/Todo';
+import { FilterStatus } from './types/FilterStatus';
+import { ErrorMessage } from './types/ErrorMessage';
+
+import { Header } from './components/Header';
+import { Footer } from './components/Footer';
+import { TodoList } from './components/TodoList';
+import { TodoItem } from './components/TodoItem';
+import { ErrorNotification } from './components/ErrorNotification';
 
 export const App: React.FC = () => {
+  const inputRef = useRef<HTMLInputElement>(null);
+
+  const [todos, setTodos] = useState<Todo[]>([]);
+  const [filter, setFilter] = useState<FilterStatus>(FilterStatus.All);
+
+  const [errorMessage, setErrorMessage] = useState<ErrorMessage>('');
+  const [tempTodo, setTempTodo] = useState<Todo | null>(null);
+
+  const [processingIds, setProcessingIds] = useState<number[]>([]);
+
+  const closeError = () => setErrorMessage('');
+
+  const showError = (message: ErrorMessage) => {
+    setErrorMessage(message);
+  };
+
+  // LOAD
+  useEffect(() => {
+    if (!USER_ID) {
+      return;
+    }
+
+    setErrorMessage('');
+
+    getTodos()
+      .then(setTodos)
+      .catch(() => showError('Unable to load todos'));
+  }, []);
+
+  // FILTER
+  const visibleTodos = useMemo(() => {
+    return todos.filter(todo => {
+      switch (filter) {
+        case FilterStatus.Active:
+          return !todo.completed;
+        case FilterStatus.Completed:
+          return todo.completed;
+        default:
+          return true;
+      }
+    });
+  }, [todos, filter]);
+
+  const activeCount = todos.filter(t => !t.completed).length;
+  const completedCount = todos.filter(t => t.completed).length;
+
+  // ADD
+  const handleCreateTodo = (title: string): Promise<void> => {
+    setErrorMessage('');
+
+    const trimmed = title.trim();
+
+    if (!trimmed) {
+      showError('Title should not be empty');
+      inputRef.current?.focus();
+
+      return Promise.reject();
+    }
+
+    const optimistic: Todo = {
+      id: 0,
+      userId: USER_ID,
+      title: trimmed,
+      completed: false,
+    };
+
+    setTempTodo(optimistic);
+
+    return addTodo(trimmed)
+      .then(created => {
+        setTodos(prev => [...prev, created]);
+      })
+      .catch(() => {
+        showError('Unable to add a todo');
+
+        return Promise.reject();
+      })
+      .finally(() => {
+        setTempTodo(null);
+        inputRef.current?.focus();
+      });
+  };
+
+  // DELETE 1
+  const handleDeleteTodo = (id: number) => {
+    setErrorMessage('');
+    setProcessingIds(prev => [...prev, id]);
+
+    deleteTodo(id)
+      .then(() => {
+        setTodos(prev => prev.filter(t => t.id !== id));
+      })
+      .catch(() => showError('Unable to delete a todo'))
+      .finally(() => {
+        setProcessingIds(prev => prev.filter(x => x !== id));
+        inputRef.current?.focus();
+      });
+  };
+
+  // CLEAR COMPLETED (parallel deletes)
+  const handleDeleteCompletedTodos = () => {
+    setErrorMessage('');
+
+    const ids = todos.filter(t => t.completed).map(t => t.id);
+
+    if (ids.length === 0) {
+      return;
+    }
+
+    setProcessingIds(prev => [...prev, ...ids]);
+
+    Promise.allSettled(ids.map(id => deleteTodo(id).then(() => ({ id }))))
+      .then(results => {
+        const successIds = results
+          .filter(r => r.status === 'fulfilled')
+          .map(r => (r as PromiseFulfilledResult<{ id: number }>).value.id);
+
+        const hasError = results.some(r => r.status === 'rejected');
+
+        if (successIds.length > 0) {
+          setTodos(prev => prev.filter(t => !successIds.includes(t.id)));
+        }
+
+        if (hasError) {
+          showError('Unable to delete a todo');
+        }
+      })
+      .finally(() => {
+        setProcessingIds(prev => prev.filter(id => !ids.includes(id)));
+        inputRef.current?.focus();
+      });
+  };
+
+  // PATCH (toggle + rename)
+  const handlePatchTodo = (id: number, data: Todo): Promise<void> => {
+    setErrorMessage('');
+    setProcessingIds(prev => [...prev, id]);
+
+    return updateTodo(id, data)
+      .then(updatedFromServer => {
+        setTodos(prev =>
+          prev.map(todo => (todo.id === id ? updatedFromServer : todo)),
+        );
+      })
+      .catch(() => {
+        showError('Unable to update a todo');
+
+        return Promise.reject();
+      })
+      .finally(() => {
+        setProcessingIds(prev => prev.filter(x => x !== id));
+      });
+  };
+
+  // TOGGLE ALL
+  const handleToggleTodos = (completed: boolean) => {
+    setErrorMessage('');
+
+    const toUpdate = todos.filter(t => t.completed !== completed);
+    const ids = toUpdate.map(t => t.id);
+
+    if (ids.length === 0) {
+      return;
+    }
+
+    setProcessingIds(prev => [...prev, ...ids]);
+
+    Promise.allSettled(toUpdate.map(t => updateTodo(t.id, { ...t, completed })))
+      .then(results => {
+        const hasError = results.some(r => r.status === 'rejected');
+
+        const updatedTodos = results
+          .filter(r => r.status === 'fulfilled')
+          .map(r => (r as PromiseFulfilledResult<Todo>).value);
+
+        if (updatedTodos.length > 0) {
+          setTodos(prev =>
+            prev.map(t => updatedTodos.find(u => u.id === t.id) ?? t),
+          );
+        }
+
+        if (hasError) {
+          showError('Unable to update a todo');
+        }
+      })
+      .finally(() => {
+        setProcessingIds(prev => prev.filter(id => !ids.includes(id)));
+      });
+  };
+
   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
+          ref={inputRef}
+          onCreateTodo={handleCreateTodo}
+          onToggleTodos={handleToggleTodos}
+          todosCountInfo={[todos.length, activeCount]}
+        />
+
+        {todos.length > 0 && (
+          <TodoList
+            visibleTodos={visibleTodos}
+            onDelete={handleDeleteTodo}
+            processingIds={processingIds}
+            onPatch={handlePatchTodo}
+          />
+        )}
+
+        {tempTodo && (
+          <TodoItem
+            todo={tempTodo}
+            onDelete={handleDeleteTodo}
+            isLoading
+            onPatch={handlePatchTodo}
+          />
+        )}
+
+        {todos.length > 0 && (
+          <Footer
+            activeCount={activeCount}
+            completedTodos={completedCount}
+            filter={filter}
+            onFilterChange={setFilter}
+            onDeleteCompletedTodo={handleDeleteCompletedTodos}
+          />
+        )}
+      </div>
+
+      <ErrorNotification
+        errorMessage={errorMessage}
+        onCloseError={closeError}
+      />
+    </div>
   );
 };

src/api/todos.ts

@@ -0,0 +1,25 @@
+import { Todo } from '../types/Todo';
+import { client } from '../utils/fetchClient';
+
+export const USER_ID = 3989;
+
+export const getTodos = () => {
+  return client.get<Todo[]>(`/todos?userId=${USER_ID}`);
+};
+
+export const addTodo = (title: string) => {
+  return client.post<Todo>('/todos', {
+    title: title,
+    userId: USER_ID,
+    completed: false,
+  });
+};
+
+export const deleteTodo = (id: number) => {
+  return client.delete(`/todos/${id}`);
+};
+
+export const updateTodo = (id: number, data: Todo) => {
+  return client.patch<Todo>(`/todos/${id}`, data);
+};
+// Add more methods here

src/components/ErrorNotification.tsx

@@ -0,0 +1,41 @@
+import React, { useEffect } from 'react';
+import classNames from 'classnames';
+import { ErrorMessage } from '../types/ErrorMessage';
+
+type Props = {
+  errorMessage: ErrorMessage;
+  onCloseError: () => void;
+};
+
+export const ErrorNotification: React.FC<Props> = ({
+  errorMessage,
+  onCloseError,
+}) => {
+  useEffect(() => {
+    if (!errorMessage) {
+      return;
+    }
+
+    const timer = setTimeout(() => onCloseError(), 3000);
+
+    return () => clearTimeout(timer);
+  }, [errorMessage, onCloseError]);
+
+  return (
+    <div
+      data-cy="ErrorNotification"
+      className={classNames(
+        'notification is-danger is-light has-text-weight-normal',
+        { hidden: !errorMessage },
+      )}
+    >
+      <button
+        data-cy="HideErrorButton"
+        type="button"
+        className="delete"
+        onClick={onCloseError}
+      />
+      {errorMessage}
+    </div>
+  );
+};