diff --git a/src/App.tsx b/src/App.tsx
index 81e011f432..70ec0fa1c9 100644
--- a/src/App.tsx
+++ b/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>
   );
 };
diff --git a/src/api/api.tsx b/src/api/api.tsx
new file mode 100644
index 0000000000..f645d587c3
--- /dev/null
+++ b/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/${id}`, data);
+}
diff --git a/src/components/Footer.tsx b/src/components/Footer.tsx
new file mode 100644
index 0000000000..9c3557e846
--- /dev/null
+++ b/src/components/Footer.tsx
@@ -0,0 +1,57 @@
+import classNames from 'classnames';
+import { Filter } from '../types/Filter';
+
+type Props = {
+  activeTodosCount: number;
+  currFilter: Filter;
+  hasCompletedTodos: boolean;
+  onFilter: (newFilter: Filter) => void;
+  onClearCompletedTodos: () => void;
+};
+
+export const Footer: React.FC<Props> = ({
+  activeTodosCount,
+  currFilter,
+  hasCompletedTodos,
+  onFilter,
+  onClearCompletedTodos,
+}) => {
+  return (
+    <footer className="todoapp__footer" data-cy="Footer">
+      <span className="todo-count" data-cy="TodosCounter">
+        {`${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>
+  );
+};
diff --git a/src/components/Header.tsx b/src/components/Header.tsx
new file mode 100644
index 0000000000..5f1b2d7eca
--- /dev/null
+++ b/src/components/Header.tsx
@@ -0,0 +1,73 @@
+import classNames from 'classnames';
+import { useEffect } from 'react';
+
+type Props = {
+  inputRef: React.RefObject<HTMLInputElement>;
+  hasTodos: boolean;
+  allCompletedTodos: boolean;
+  onAddTodo: (value: string) => Promise<void>;
+  onToggleAll: () => void;
+};
+
+export const Header: React.FC<Props> = ({
+  inputRef,
+  hasTodos,
+  allCompletedTodos,
+  onAddTodo,
+  onToggleAll,
+}) => {
+  useEffect(() => {
+    if (inputRef.current) {
+      inputRef.current.focus();
+    }
+  }, [inputRef]);
+
+  const handleSubmit = (event: React.FormEvent) => {
+    event.preventDefault();
+
+    const inputElement = inputRef.current;
+
+    if (inputElement) {
+      inputElement.disabled = true;
+
+      onAddTodo(inputElement.value)
+        .then(() => {
+          if (inputElement) {
+            inputElement.value = '';
+          }
+        })
+        .catch(() => {})
+        .finally(() => {
+          if (inputElement) {
+            inputElement.disabled = false;
+            inputElement.focus();
+          }
+        });
+    }
+  };
+
+  return (
+    <header className="todoapp__header">
+      {hasTodos && (
+        <button
+          type="button"
+          className={classNames('todoapp__toggle-all', {
+            active: allCompletedTodos,
+          })}
+          data-cy="ToggleAllButton"
+          onClick={onToggleAll}
+        />
+      )}
+
+      <form onSubmit={handleSubmit}>
+        <input
+          data-cy="NewTodoField"
+          type="text"
+          className="todoapp__new-todo"
+          placeholder="What needs to be done?"
+          ref={inputRef}
+        />
+      </form>
+    </header>
+  );
+};
diff --git a/src/components/Notification.tsx b/src/components/Notification.tsx
new file mode 100644
index 0000000000..23910284ef
--- /dev/null
+++ b/src/components/Notification.tsx
@@ -0,0 +1,31 @@
+import classNames from 'classnames';
+
+type Props = {
+  message: string;
+  isHidden: boolean;
+  onClose: (value: boolean) => void;
+};
+
+export const Notification: React.FC<Props> = ({
+  message,
+  isHidden,
+  onClose,
+}) => {
+  return (
+    <div
+      data-cy="ErrorNotification"
+      className={classNames(
+        'notification is-danger is-light has-text-weight-normal',
+        { hidden: isHidden },
+      )}
+    >
+      <button
+        data-cy="HideErrorButton"
+        type="button"
+        className="delete"
+        onClick={() => onClose(true)}
+      />
+      {message}
+    </div>
+  );
+};
diff --git a/src/components/TodoItem.tsx b/src/components/TodoItem.tsx
new file mode 100644
index 0000000000..bb59367ecb
--- /dev/null
+++ b/src/components/TodoItem.tsx
@@ -0,0 +1,124 @@
+import classNames from 'classnames';
+import { Todo } from '../types/Todo';
+import { useRef, useState } from 'react';
+
+type Props = {
+  todo: Todo;
+  isLoading?: boolean;
+  onDeleteTodo?: (value: number) => Promise<void>;
+  onUpdateTodo?: (updatedTodo: Todo) => Promise<void>;
+};
+
+export const TodoItem: React.FC<Props> = ({
+  todo,
+  onDeleteTodo = () => {},
+  isLoading = false,
+  onUpdateTodo = () => {},
+}) => {
+  const { completed, id, title: todoTitle, userId } = todo;
+
+  const [isEditing, setIsEditing] = useState(false);
+  const [editedTitle, setEditedTitle] = useState(todoTitle);
+  const inputEdit = useRef(null);
+
+  const handleEditSubmit = (event: React.FormEvent) => {
+    event.preventDefault();
+
+    const trimmedTitle = editedTitle.trim();
+
+    if (trimmedTitle === todoTitle) {
+      setIsEditing(false);
+
+      return;
+    }
+
+    if (!trimmedTitle) {
+      onDeleteTodo(id)
+        ?.then(() => setIsEditing(false))
+        .catch(() => {});
+
+      return;
+    }
+
+    onUpdateTodo({ id, userId, completed, title: trimmedTitle })
+      ?.then(() => setIsEditing(false))
+      .catch(() => {});
+  };
+
+  const handleEditCancel = (event: React.KeyboardEvent) => {
+    if (event.key === 'Escape') {
+      setIsEditing(false);
+    }
+  };
+
+  return (
+    <div
+      data-cy="Todo"
+      className={classNames('todo', { completed: completed })}
+      key={id}
+    >
+      {/* eslint-disable-next-line jsx-a11y/label-has-associated-control */}
+      <label className="todo__status-label">
+        <input
+          data-cy="TodoStatus"
+          type="checkbox"
+          className="todo__status"
+          checked={completed}
+          onChange={() =>
+            onUpdateTodo({
+              id,
+              title: editedTitle,
+              completed: !completed,
+              userId,
+            })
+          }
+        />
+      </label>
+
+      {isEditing ? (
+        <form onSubmit={handleEditSubmit} onKeyUp={handleEditCancel}>
+          <input
+            data-cy="TodoTitleField"
+            type="text"
+            ref={inputEdit}
+            className="todo__title-field"
+            placeholder="Empty todo will be deleted"
+            value={editedTitle}
+            onChange={event => setEditedTitle(event.target.value)}
+            onBlur={handleEditSubmit}
+            autoFocus
+          />
+        </form>
+      ) : (
+        <>
+          <span
+            data-cy="TodoTitle"
+            className="todo__title"
+            onDoubleClick={() => {
+              setIsEditing(true);
+              setEditedTitle(todoTitle);
+            }}
+          >
+            {todoTitle}
+          </span>
+          <button
+            type="button"
+            className="todo__remove"
+            data-cy="TodoDelete"
+            onClick={() => onDeleteTodo(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>
+  );
+};
diff --git a/src/components/TodoLIst.tsx b/src/components/TodoLIst.tsx
new file mode 100644
index 0000000000..04008b14d0
--- /dev/null
+++ b/src/components/TodoLIst.tsx
@@ -0,0 +1,34 @@
+import { Todo } from '../types/Todo';
+import { TodoItem } from './TodoItem';
+
+type Props = {
+  todos: Todo[];
+  tempTodo: Todo | null;
+  onDeleteTodo: (value: number) => Promise<void>;
+  loading: number[];
+  onUpdateTodo: (updatedTodo: Todo) => Promise<void>;
+};
+
+export const TodoList: React.FC<Props> = ({
+  todos,
+  tempTodo,
+  onDeleteTodo,
+  loading,
+  onUpdateTodo,
+}) => {
+  return (
+    <div className="todoapp__main" data-cy="TodoList">
+      {todos.map(todo => (
+        <TodoItem
+          todo={todo}
+          key={todo.id}
+          onDeleteTodo={onDeleteTodo}
+          isLoading={loading.includes(todo.id)}
+          onUpdateTodo={onUpdateTodo}
+        />
+      ))}
+
+      {tempTodo && <TodoItem todo={tempTodo} isLoading />}
+    </div>
+  );
+};
diff --git a/src/types/Filter.ts b/src/types/Filter.ts
new file mode 100644
index 0000000000..174408fd69
--- /dev/null
+++ b/src/types/Filter.ts
@@ -0,0 +1,5 @@
+export enum Filter {
+  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/fetchClients.ts b/src/utils/fetchClients.ts
new file mode 100644
index 0000000000..708ac4c17b
--- /dev/null
+++ b/src/utils/fetchClients.ts
@@ -0,0 +1,46 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
+const BASE_URL = 'https://mate.academy/students-api';
+
+// returns a promise resolved after a given delay
+function wait(delay: number) {
+  return new Promise(resolve => {
+    setTimeout(resolve, delay);
+  });
+}
+
+// To have autocompletion and avoid mistypes
+type RequestMethod = 'GET' | 'POST' | 'PATCH' | 'DELETE';
+
+function request<T>(
+  url: string,
+  method: RequestMethod = 'GET',
+  data: any = null, // we can send any data to the server
+): Promise<T> {
+  const options: RequestInit = { method };
+
+  if (data) {
+    // We add body and Content-Type only for the requests with data
+    options.body = JSON.stringify(data);
+    options.headers = {
+      'Content-Type': 'application/json; charset=UTF-8',
+    };
+  }
+
+  // DON'T change the delay it is required for tests
+  return wait(100)
+    .then(() => fetch(BASE_URL + url, options))
+    .then(response => {
+      if (!response.ok) {
+        throw new Error();
+      }
+
+      return response.json();
+    });
+}
+
+export const client = {
+  get: <T>(url: string) => request<T>(url),
+  post: <T>(url: string, data: any) => request<T>(url, 'POST', data),
+  patch: <T>(url: string, data: any) => request<T>(url, 'PATCH', data),
+  delete: (url: string) => request(url, 'DELETE'),
+};