add task solution

src/App.tsx

@@ -1,26 +1,366 @@
 /* eslint-disable max-len */
-/* eslint-disable jsx-a11y/control-has-associated-label */
-import React from 'react';
+import React, { useEffect, useMemo, useRef, useState } from 'react';
+import classNames from 'classnames';
 import { UserWarning } from './UserWarning';
+import { Todo } from './types/Todo';
+import * as todoService from './api/todos';
 
-const USER_ID = 0;
+const USER_ID = todoService.USER_ID || 0;
+
+type Filter = 'all' | 'active' | 'completed';
 
 export const App: React.FC = () => {
+  const [todos, setTodos] = useState<Todo[]>([]);
+  const [filter, setFilter] = useState<Filter>('all');
+  const [errorMessage, setErrorMessage] = useState('');
+  const [newTitle, setNewTitle] = useState('');
+  const [isAdding, setIsAdding] = useState(false);
+  const [loadingIds, setLoadingIds] = useState<number[]>([]);
+  const [editingId, setEditingId] = useState<number | null>(null);
+  const [editTitle, setEditTitle] = useState('');
+
+  const inputRef = useRef<HTMLInputElement>(null);
+
+  const showError = (message: string) => {
+    setErrorMessage(message);
+    setTimeout(() => setErrorMessage(''), 3000);
+  };
+
+  useEffect(() => {
+    todoService
+      .getTodos()
+      .then(setTodos)
+      .catch(() => showError('Unable to load todos'));
+  }, []);
+
+  useEffect(() => {
+    if (!isAdding && editingId === null) {
+      inputRef.current?.focus();
+    }
+  }, [todos.length, errorMessage, isAdding, editingId]);
+
+  const completedTodos = useMemo(() => todos.filter(t => t.completed), [todos]);
+  const activeCount = todos.length - completedTodos.length;
+
+  const visibleTodos = useMemo(() => {
+    switch (filter) {
+      case 'active':
+        return todos.filter(t => !t.completed);
+      case 'completed':
+        return todos.filter(t => t.completed);
+      default:
+        return todos;
+    }
+  }, [todos, filter]);
+
+  const toggleTodo = (todo: Todo) => {
+    setLoadingIds(prev => [...prev, todo.id]);
+
+    todoService
+      .updateTodo({
+        ...todo,
+        completed: !todo.completed,
+      })
+      .then(updated => {
+        setTodos(prev => prev.map(t => (t.id === todo.id ? updated : t)));
+      })
+      .catch(() => showError('Unable to update a todo'))
+      .finally(() => {
+        setLoadingIds(prev => prev.filter(id => id !== todo.id));
+      });
+  };
+
+  const removeTodo = (id: number) => {
+    setLoadingIds(prev => [...prev, id]);
+
+    todoService
+      .deleteTodo(id)
+      .then(() => {
+        setTodos(prev => prev.filter(t => t.id !== id));
+      })
+      .catch(() => showError('Unable to delete a todo'))
+      .finally(() => {
+        setLoadingIds(prev => prev.filter(x => x !== id));
+      });
+  };
+
+  const updateTitle = (todo: Todo) => {
+    const trimmedTitle = editTitle.trim();
+
+    if (trimmedTitle === todo.title) {
+      setEditingId(null);
+
+      return;
+    }
+
+    if (!trimmedTitle) {
+      removeTodo(todo.id);
+
+      return;
+    }
+
+    setLoadingIds(prev => [...prev, todo.id]);
+
+    todoService
+      .updateTodo({ ...todo, title: trimmedTitle })
+      .then(updated => {
+        setTodos(prev => prev.map(t => (t.id === todo.id ? updated : t)));
+        setEditingId(null);
+      })
+      .catch(() => showError('Unable to update a todo'))
+      .finally(() => {
+        setLoadingIds(prev => prev.filter(id => id !== todo.id));
+      });
+  };
+
+  const toggleAll = () => {
+    const newStatus = activeCount > 0;
+    const todosToUpdate = todos.filter(t => t.completed !== newStatus);
+
+    todosToUpdate.forEach(toggleTodo);
+  };
+
+  const clearCompleted = () => {
+    completedTodos.forEach(todo => removeTodo(todo.id));
+  };
+
+  const handleSubmit = (e: React.FormEvent) => {
+    e.preventDefault();
+    const trimmed = newTitle.trim();
+
+    if (!trimmed) {
+      showError('Title should not be empty');
+
+      return;
+    }
+
+    setIsAdding(true);
+
+    todoService
+      .createTodo({
+        title: trimmed,
+        completed: false,
+        userId: USER_ID,
+      })
+      .then(created => {
+        setTodos(prev => [...prev, created]);
+        setNewTitle('');
+      })
+      .catch(() => showError('Unable to add a todo'))
+      .finally(() => setIsAdding(false));
+  };
+
   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 className="todoapp__header">
+          {todos.length > 0 && (
+            <button
+              type="button"
+              className={classNames('todoapp__toggle-all', {
+                active: activeCount === 0,
+              })}
+              aria-label="Toggle all todos"
+              data-cy="ToggleAllButton"
+              onClick={toggleAll}
+            />
+          )}
+
+          <form onSubmit={handleSubmit}>
+            <input
+              data-cy="NewTodoField"
+              className="todoapp__new-todo"
+              placeholder="What needs to be done?"
+              aria-label="New todo title"
+              ref={inputRef}
+              value={newTitle}
+              onChange={e => setNewTitle(e.target.value)}
+              disabled={isAdding}
+            />
+          </form>
+        </header>
+
+        <section className="todoapp__main" data-cy="TodoList">
+          {visibleTodos.map(todo => {
+            const isLoading = loadingIds.includes(todo.id);
+            const isEditing = editingId === todo.id;
+            const todoId = `todo-status-${todo.id}`;
+
+            return (
+              <div
+                key={todo.id}
+                data-cy="Todo"
+                className={classNames('todo', {
+                  completed: todo.completed,
+                  editing: isEditing,
+                })}
+              >
+                <label className="todo__status-label" htmlFor={todoId}>
+                  <input
+                    id={todoId}
+                    data-cy="TodoStatus"
+                    type="checkbox"
+                    className="todo__status"
+                    checked={todo.completed}
+                    onChange={() => toggleTodo(todo)}
+                    aria-label="Toggle todo status"
+                  />
+                </label>
+
+                {isEditing ? (
+                  <form
+                    onSubmit={e => {
+                      e.preventDefault();
+                      updateTitle(todo);
+                    }}
+                  >
+                    <input
+                      autoFocus
+                      data-cy="TodoTitleField"
+                      className="todo__title-field"
+                      aria-label="Edit todo title"
+                      value={editTitle}
+                      onChange={e => setEditTitle(e.target.value)}
+                      onBlur={() => updateTitle(todo)}
+                      onKeyUp={e => {
+                        if (e.key === 'Escape') {
+                          setEditingId(null);
+                        }
+                      }}
+                    />
+                  </form>
+                ) : (
+                  <>
+                    <span
+                      data-cy="TodoTitle"
+                      className="todo__title"
+                      onDoubleClick={() => {
+                        setEditingId(todo.id);
+                        setEditTitle(todo.title);
+                      }}
+                    >
+                      {todo.title}
+                    </span>
+                    <button
+                      type="button"
+                      className="todo__remove"
+                      data-cy="TodoDelete"
+                      aria-label="Delete todo"
+                      onClick={() => removeTodo(todo.id)}
+                    >
+                      ×
+                    </button>
+                  </>
+                )}
+
+                <div
+                  data-cy="TodoLoader"
+                  className={classNames('modal overlay', {
+                    'is-active': isLoading,
+                  })}
+                >
+                  <div className="modal-background has-background-white-ter" />
+                  <div className="loader" />
+                </div>
+              </div>
+            );
+          })}
+
+          {isAdding && (
+            <div data-cy="Todo" className="todo">
+              <label className="todo__status-label">
+                <input
+                  type="checkbox"
+                  className="todo__status"
+                  disabled
+                  aria-label="Toggle status"
+                />
+              </label>
+              <span data-cy="TodoTitle" className="todo__title">
+                {newTitle}
+              </span>
+              <div data-cy="TodoLoader" className="modal overlay is-active">
+                <div className="modal-background has-background-white-ter" />
+                <div className="loader" />
+              </div>
+            </div>
+          )}
+        </section>
+
+        {todos.length > 0 && (
+          <footer className="todoapp__footer" data-cy="Footer">
+            <span className="todo-count" data-cy="TodosCounter">
+              {activeCount} items left
+            </span>
+
+            <nav className="filter" data-cy="Filter">
+              <a
+                href="#/"
+                data-cy="FilterLinkAll"
+                className={classNames('filter__link', {
+                  selected: filter === 'all',
+                })}
+                onClick={() => setFilter('all')}
+              >
+                All
+              </a>
+              <a
+                href="#/active"
+                data-cy="FilterLinkActive"
+                className={classNames('filter__link', {
+                  selected: filter === 'active',
+                })}
+                onClick={() => setFilter('active')}
+              >
+                Active
+              </a>
+              <a
+                href="#/completed"
+                data-cy="FilterLinkCompleted"
+                className={classNames('filter__link', {
+                  selected: filter === 'completed',
+                })}
+                onClick={() => setFilter('completed')}
+              >
+                Completed
+              </a>
+            </nav>
+
+            <button
+              type="button"
+              className="todoapp__clear-completed"
+              data-cy="ClearCompletedButton"
+              onClick={clearCompleted}
+              disabled={completedTodos.length === 0}
+            >
+              Clear completed
+            </button>
+          </footer>
+        )}
+      </div>
+
+      <div
+        data-cy="ErrorNotification"
+        className={classNames(
+          'notification is-danger is-light has-text-weight-normal',
+          { hidden: !errorMessage },
+        )}
+      >
+        <button
+          type="button"
+          data-cy="HideErrorButton"
+          className="delete"
+          aria-label="Hide notification"
+          onClick={() => setErrorMessage('')}
+        />
+        {errorMessage}
+      </div>
+    </div>
   );
 };