diff --git a/src/App.tsx b/src/App.tsx
index 81e011f432..2b5108bb47 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -1,26 +1,232 @@
 /* eslint-disable max-len */
 /* eslint-disable jsx-a11y/control-has-associated-label */
-import React from 'react';
-import { UserWarning } from './UserWarning';
+import React, { useState, useEffect, useRef } from 'react';
+import * as todoService from './api/todos';
+import { Todo } from './types/Todo';
+import { Header } from './components/Header';
+import { TodoList } from './components/TodoList';
+import { Footer } from './components/Footer';
+import { ErrorNotification } from './components/ErrorNotification';
+import { FilterStatus } from './enums/FilterStatus';
 
-const USER_ID = 0;
+enum ErrorMessages {
+  None = '',
+  Load = 'Unable to load todos',
+  Empty = 'Title should not be empty',
+  Add = 'Unable to add a todo',
+  Delete = 'Unable to delete a todo',
+  Update = 'Unable to update a todo',
+}
 
 export const App: React.FC = () => {
-  if (!USER_ID) {
-    return <UserWarning />;
-  }
+  const [todos, setTodos] = useState<Todo[]>([]);
+  const [filter, setFilter] = useState<FilterStatus>(FilterStatus.All);
+  const [errorMessage, setErrorMessage] = useState<ErrorMessages>(
+    ErrorMessages.None,
+  );
+  const [query, setQuery] = useState('');
+  const [tempTodo, setTempTodo] = useState<Todo | null>(null);
+  const [loadingIds, setLoadingIds] = useState<number[]>([]);
+
+  const itemField = useRef<HTMLInputElement>(null);
+
+  useEffect(() => {
+    todoService
+      .getTodos()
+      .then(setTodos)
+      .catch(() => setErrorMessage(ErrorMessages.Load))
+      .finally(() => {
+        itemField.current?.focus();
+      });
+  }, []);
+
+  const visibleTodos = todos.filter(todo => {
+    if (filter === FilterStatus.Active) {
+      return !todo.completed;
+    }
+
+    if (filter === FilterStatus.Completed) {
+      return todo.completed;
+    }
+
+    return true;
+  });
+
+  const toggleTodoLocal = (id: number) => {
+    setTodos(currentTodos =>
+      currentTodos.map(todo => {
+        if (todo.id === id) {
+          return { ...todo, completed: !todo.completed };
+        }
+
+        return todo;
+      }),
+    );
+  };
+
+  const activeTodosCount = todos.filter(todo => !todo.completed).length;
+
+  const hasCompleted = todos.some(todo => todo.completed);
+
+  const deleteTodo = (todoId: number) => {
+    setLoadingIds(prev => [...prev, todoId]);
+    todoService
+      .deleteTodo(todoId)
+      .then(() =>
+        setTodos(current => current.filter(todo => todo.id !== todoId)),
+      )
+      .catch(() => {
+        setErrorMessage(ErrorMessages.Delete);
+        setTimeout(() => setErrorMessage(ErrorMessages.None), 3000);
+      })
+      .finally(() => {
+        setLoadingIds(prev => prev.filter(id => id !== todoId));
+        itemField.current?.focus();
+      });
+  };
+
+  const handleSubmit = (event: React.FormEvent) => {
+    event.preventDefault();
+    const trimmedTitle = query.trim();
+
+    if (!trimmedTitle) {
+      setErrorMessage(ErrorMessages.Empty);
+      setTimeout(() => setErrorMessage(ErrorMessages.None), 3000);
+
+      return;
+    }
+
+    setTempTodo({ id: 0, userId: 4057, title: trimmedTitle, completed: false });
+
+    todoService
+      .createTodo({ userId: 4057, title: trimmedTitle, completed: false })
+      .then(newTodo => {
+        setTodos(prev => [...prev, newTodo]);
+        setQuery('');
+      })
+      .catch(() => {
+        setErrorMessage(ErrorMessages.Add);
+        setTimeout(() => setErrorMessage(ErrorMessages.None), 3000);
+      })
+      .finally(() => {
+        setTempTodo(null);
+        setTimeout(() => {
+          itemField.current?.focus();
+        }, 0);
+      });
+  };
+
+  const clearCompleted = async () => {
+    const completedTodos = todos.filter(todo => todo.completed);
+
+    const deletionPromises = completedTodos.map(todo => {
+      return todoService
+        .deleteTodo(todo.id)
+        .then(() => {
+          setTodos(currentTodos => currentTodos.filter(t => t.id !== todo.id));
+        })
+        .catch(() => {
+          setErrorMessage(ErrorMessages.Delete);
+          setTimeout(() => setErrorMessage(ErrorMessages.None), 3000);
+        });
+    });
+
+    await Promise.all(deletionPromises);
+
+    itemField.current?.focus();
+  };
+
+  const handleUpdateTodo = ({ id, title, completed }: Todo) => {
+    setLoadingIds(prev => [...prev, id]);
+
+    return todoService
+      .updateTodo({ id, title, completed })
+      .then(updatedTodo => {
+        setTodos(current =>
+          current.map(todo => (todo.id === id ? updatedTodo : todo)),
+        );
+      })
+      .catch(() => {
+        setErrorMessage(ErrorMessages.Update);
+        setTimeout(() => setErrorMessage(ErrorMessages.None), 3000);
+        throw new Error();
+      })
+      .finally(() => {
+        setLoadingIds(prev => prev.filter(loadingId => loadingId !== id));
+      });
+  };
+
+  const toggleAll = async () => {
+    const areAllCompleted = todos.every(todo => todo.completed);
+    const newStatus = !areAllCompleted;
+
+    const todosToUpdate = todos.filter(todo => todo.completed !== newStatus);
+    const idsToUpdate = todosToUpdate.map(t => t.id);
+
+    setLoadingIds(prev => [...prev, ...idsToUpdate]);
+
+    try {
+      await Promise.all(
+        todosToUpdate.map(todo =>
+          todoService.updateTodo({ ...todo, completed: newStatus }),
+        ),
+      );
+
+      setTodos(current =>
+        current.map(todo =>
+          idsToUpdate.includes(todo.id)
+            ? { ...todo, completed: newStatus }
+            : todo,
+        ),
+      );
+    } catch {
+      setErrorMessage(ErrorMessages.Update);
+      setTimeout(() => setErrorMessage(ErrorMessages.None), 3000);
+    }
+  };
 
   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
+          todoFieldRef={itemField}
+          query={query}
+          setQuery={setQuery}
+          onSubmit={handleSubmit}
+          disabled={!!tempTodo}
+          hasTodos={todos.length > 0}
+          onToggleAll={toggleAll}
+          isAllCompleted={
+            todos.length > 0 && todos.every(todo => todo.completed)
+          }
+        />
+
+        {(todos.length > 0 || tempTodo) && (
+          <>
+            <TodoList
+              todos={visibleTodos}
+              onDelete={deleteTodo}
+              loadingIds={loadingIds}
+              tempTodo={tempTodo}
+              onToggle={toggleTodoLocal}
+              onUpdate={handleUpdateTodo}
+            />
+            <Footer
+              filter={filter}
+              setFilter={setFilter}
+              activeCount={activeTodosCount}
+              hasCompleted={hasCompleted}
+              onClearCompleted={clearCompleted}
+            />
+          </>
+        )}
+      </div>
+
+      <ErrorNotification
+        message={errorMessage}
+        onClose={() => setErrorMessage(ErrorMessages.None)}
+      />
+    </div>
   );
 };
diff --git a/src/api/todos.ts b/src/api/todos.ts
new file mode 100644
index 0000000000..e2824abf83
--- /dev/null
+++ b/src/api/todos.ts
@@ -0,0 +1,20 @@
+import { Todo } from '../types/Todo';
+import { client } from '../utils/fetchClient';
+
+export const USER_ID = 4057;
+
+export const getTodos = () => {
+  return client.get<Todo[]>(`/todos?userId=${USER_ID}`);
+};
+
+export const createTodo = (todo: Omit<Todo, 'id'>) => {
+  return client.post<Todo>('/todos', todo);
+};
+
+export const deleteTodo = (todoId: number) => {
+  return client.delete(`/todos/${todoId}`);
+};
+
+export const updateTodo = ({ id, title, completed }: Todo) => {
+  return client.patch<Todo>(`/todos/${id}`, { title, completed });
+};
diff --git a/src/components/ErrorNotification.tsx b/src/components/ErrorNotification.tsx
new file mode 100644
index 0000000000..82e4a1634e
--- /dev/null
+++ b/src/components/ErrorNotification.tsx
@@ -0,0 +1,38 @@
+import React, { useEffect } from 'react';
+import cn from 'classnames';
+
+type Props = {
+  message: string;
+  onClose: () => void;
+};
+
+export const ErrorNotification: React.FC<Props> = ({ message, onClose }) => {
+  useEffect(() => {
+    if (!message) {
+      return;
+    }
+
+    const timer = setTimeout(() => {
+      onClose();
+    }, 3000);
+
+    return () => clearTimeout(timer);
+  }, [message, onClose]);
+
+  return (
+    <div
+      data-cy="ErrorNotification"
+      className={cn('notification is-danger is-light has-text-weight-normal', {
+        hidden: !message,
+      })}
+    >
+      <button
+        data-cy="HideErrorButton"
+        type="button"
+        className="delete"
+        onClick={onClose}
+      />
+      {message}
+    </div>
+  );
+};
diff --git a/src/components/Footer.tsx b/src/components/Footer.tsx
new file mode 100644
index 0000000000..b13e310ca5
--- /dev/null
+++ b/src/components/Footer.tsx
@@ -0,0 +1,54 @@
+import React from 'react';
+import cn from 'classnames';
+import { FilterStatus } from '../enums/FilterStatus';
+
+interface Props {
+  filter: FilterStatus;
+  setFilter: (filter: FilterStatus) => void;
+  activeCount: number;
+  onClearCompleted: () => void;
+  hasCompleted: boolean;
+}
+
+export const Footer: React.FC<Props> = ({
+  filter,
+  setFilter,
+  activeCount,
+  onClearCompleted,
+  hasCompleted,
+}) => {
+  return (
+    <footer className="todoapp__footer" data-cy="Footer">
+      <span className="todo-count" data-cy="TodosCounter">
+        {`${activeCount} items left`}
+      </span>
+
+      <nav className="filter" data-cy="Filter">
+        <nav className="filter" data-cy="Filter">
+          {Object.values(FilterStatus).map(status => (
+            <a
+              key={status}
+              href={status === FilterStatus.All ? '#/' : `#/${status}`}
+              className={cn('filter__link', {
+                selected: filter === status,
+              })}
+              onClick={() => setFilter(status)}
+              data-cy={`FilterLink${status[0].toUpperCase() + status.slice(1)}`}
+            >
+              {status[0].toUpperCase() + status.slice(1)}
+            </a>
+          ))}
+        </nav>
+      </nav>
+      <button
+        type="button"
+        className="todoapp__clear-completed"
+        data-cy="ClearCompletedButton"
+        onClick={onClearCompleted}
+        disabled={!hasCompleted}
+      >
+        Clear completed
+      </button>
+    </footer>
+  );
+};
diff --git a/src/components/Header.tsx b/src/components/Header.tsx
new file mode 100644
index 0000000000..176bc94df2
--- /dev/null
+++ b/src/components/Header.tsx
@@ -0,0 +1,50 @@
+import React from 'react';
+import cn from 'classnames';
+
+type Props = {
+  todoFieldRef: React.RefObject<HTMLInputElement>;
+  query: string;
+  setQuery: (value: string) => void;
+  onSubmit: (event: React.FormEvent) => void;
+  disabled: boolean;
+  onToggleAll: () => void;
+  isAllCompleted: boolean;
+  hasTodos: boolean;
+};
+
+export const Header: React.FC<Props> = ({
+  todoFieldRef,
+  query,
+  setQuery,
+  onSubmit,
+  disabled,
+  onToggleAll,
+  isAllCompleted,
+  hasTodos,
+}) => {
+  return (
+    <header className="todoapp__header">
+      {hasTodos && (
+        <button
+          type="button"
+          className={cn('todoapp__toggle-all', { active: isAllCompleted })}
+          data-cy="ToggleAllButton"
+          onClick={onToggleAll}
+        />
+      )}
+
+      <form onSubmit={onSubmit}>
+        <input
+          data-cy="NewTodoField"
+          ref={todoFieldRef}
+          type="text"
+          className="todoapp__new-todo"
+          placeholder="What needs to be done?"
+          value={query}
+          onChange={event => setQuery(event.target.value)}
+          disabled={disabled}
+        />
+      </form>
+    </header>
+  );
+};
diff --git a/src/components/TodoItem.tsx b/src/components/TodoItem.tsx
new file mode 100644
index 0000000000..71cf885ccb
--- /dev/null
+++ b/src/components/TodoItem.tsx
@@ -0,0 +1,119 @@
+/* eslint-disable jsx-a11y/label-has-associated-control */
+import React, { useState, useRef, useEffect } from 'react';
+import cn from 'classnames';
+import { Todo } from '../types/Todo';
+
+interface Props {
+  todo: Todo;
+  onDelete: (id: number) => void;
+  isLoading: boolean;
+  onUpdate: (todo: Todo) => Promise<void>;
+}
+
+export const TodoItem: React.FC<Props> = ({
+  todo,
+  onDelete,
+  isLoading,
+  onUpdate,
+}) => {
+  const [isEditing, setIsEditing] = useState(false);
+  const [newTitle, setNewTitle] = useState(todo.title);
+  const editFieldRef = useRef<HTMLInputElement>(null);
+
+  useEffect(() => {
+    if (isEditing) {
+      editFieldRef.current?.focus();
+    }
+  }, [isEditing]);
+
+  const handleSubmit = (event?: React.FormEvent) => {
+    event?.preventDefault();
+    const trimmedTitle = newTitle.trim();
+
+    if (trimmedTitle === todo.title) {
+      setIsEditing(false);
+
+      return;
+    }
+
+    if (!trimmedTitle) {
+      onDelete(todo.id);
+
+      return;
+    }
+
+    onUpdate({ ...todo, title: trimmedTitle })
+      .then(() => setIsEditing(false))
+      .catch(() => {
+        editFieldRef.current?.focus();
+      });
+  };
+
+  const handleKeyUp = (event: React.KeyboardEvent) => {
+    if (event.key === 'Escape') {
+      setIsEditing(false);
+      setNewTitle(todo.title);
+    }
+  };
+
+  return (
+    <div
+      data-cy="Todo"
+      className={cn('todo', {
+        completed: todo.completed,
+        editing: isEditing,
+      })}
+    >
+      <label className="todo__status-label">
+        <input
+          data-cy="TodoStatus"
+          type="checkbox"
+          className="todo__status"
+          checked={todo.completed}
+          onChange={() => onUpdate({ ...todo, completed: !todo.completed })}
+        />
+      </label>
+
+      {isEditing ? (
+        <form onSubmit={handleSubmit}>
+          <input
+            data-cy="TodoTitleField"
+            type="text"
+            className="todo__edit"
+            ref={editFieldRef}
+            value={newTitle}
+            onChange={e => setNewTitle(e.target.value)}
+            onBlur={handleSubmit}
+            onKeyUp={handleKeyUp}
+          />
+        </form>
+      ) : (
+        <>
+          <span
+            data-cy="TodoTitle"
+            className="todo__title"
+            onDoubleClick={() => setIsEditing(true)}
+          >
+            {todo.title}
+          </span>
+          <button
+            type="button"
+            className="todo__remove"
+            data-cy="TodoDelete"
+            onClick={() => onDelete(todo.id)}
+          >
+            ×
+          </button>
+        </>
+      )}
+
+      <div
+        data-cy="TodoLoader"
+        className={cn('modal overlay', { 'is-active': isLoading })}
+      >
+        <div className="modal-background has-background-white-ter" />
+        <div className="loader" />
+      </div>
+    </div>
+  );
+};
diff --git a/src/components/TodoList.tsx b/src/components/TodoList.tsx
new file mode 100644
index 0000000000..b413ea3768
--- /dev/null
+++ b/src/components/TodoList.tsx
@@ -0,0 +1,45 @@
+import React from 'react';
+import { Todo } from '../types/Todo';
+import { TodoItem } from './TodoItem';
+
+interface Props {
+  todos: Todo[];
+  onDelete: (id: number) => void;
+  loadingIds: number[];
+  tempTodo: Todo | null;
+  onToggle: (id: number) => void;
+  onUpdate: (todo: Todo) => Promise<void>;
+}
+
+export const TodoList: React.FC<Props> = ({
+  todos,
+  onDelete,
+  loadingIds,
+  tempTodo,
+  onToggle,
+  onUpdate,
+}) => {
+  return (
+    <section className="todoapp__main" data-cy="TodoList">
+      {todos.map(todo => (
+        <TodoItem
+          key={todo.id}
+          todo={todo}
+          onDelete={onDelete}
+          isLoading={loadingIds.includes(todo.id)}
+          onToggle={onToggle}
+          onUpdate={onUpdate}
+        />
+      ))}
+      {tempTodo && (
+        <TodoItem
+          todo={tempTodo}
+          isLoading={true}
+          onDelete={() => {}}
+          onToggle={() => {}}
+          onUpdate={() => Promise.resolve()}
+        />
+      )}
+    </section>
+  );
+};
diff --git a/src/enums/FilterStatus.ts b/src/enums/FilterStatus.ts
new file mode 100644
index 0000000000..a5d0643a05
--- /dev/null
+++ b/src/enums/FilterStatus.ts
@@ -0,0 +1,6 @@
+
+export enum FilterStatus {
+  All = 'all',
+  Active = 'active',
+  Completed = 'completed',
+}
diff --git a/src/types/Todo.ts b/src/types/Todo.ts
new file mode 100644
index 0000000000..3f52a5fdde
--- /dev/null
+++ b/src/types/Todo.ts
@@ -0,0 +1,6 @@
+export interface Todo {
+  id: number;
+  userId: number;
+  title: string;
+  completed: boolean;
+}
diff --git a/src/utils/fetchClient.ts b/src/utils/fetchClient.ts
new file mode 100644
index 0000000000..b995721f0b
--- /dev/null
+++ b/src/utils/fetchClient.ts
@@ -0,0 +1,39 @@
+const BASE_URL = 'https://mate.academy/students-api';
+
+function wait(delay: number) {
+  return new Promise(resolve => setTimeout(resolve, delay));
+}
+
+type RequestMethod = 'GET' | 'POST' | 'PATCH' | 'DELETE';
+
+async function request<T>(
+  url: string,
+  method: RequestMethod = 'GET',
+  data: unknown = null,
+): Promise<T> {
+  const options: RequestInit = { method };
+
+  if (data !== null) {
+    options.body = JSON.stringify(data);
+    options.headers = {
+      'Content-Type': 'application/json; charset=UTF-8',
+    };
+  }
+
+  await wait(100);
+
+  const response = await fetch(BASE_URL + url, options);
+
+  if (!response.ok) {
+    throw new Error();
+  }
+
+  return response.json();
+}
+
+export const client = {
+  get: <T>(url: string) => request<T>(url),
+  post: <T>(url: string, data: unknown) => request<T>(url, 'POST', data),
+  patch: <T>(url: string, data: unknown) => request<T>(url, 'PATCH', data),
+  delete: <T>(url: string) => request<T>(url, 'DELETE'),
+};