diff --git a/src/App.tsx b/src/App.tsx
index 81e011f432..c72c9d7df0 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -1,26 +1,293 @@
-/* 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, { useState, useEffect, useRef } from 'react';
 import { UserWarning } from './UserWarning';
+import { USER_ID } from './api/todos';
+import * as todoService from './api/todos';
+import { Todo } from './types/Todo';
 
-const USER_ID = 0;
+import { Header } from './component/Header';
+import { TodoList } from './component/TodoList';
+import { Footer } from './component/Footer';
+import { ErrorNotification } from './component/Error';
+
+export enum ErrorText {
+  EmptyTitle = 'Title should not be empty',
+  AddFailed = 'Unable to add a todo',
+  UpdateFailed = 'Unable to update a todo',
+  DeleteFailed = 'Unable to delete a todo',
+  LoadFailed = 'Unable to load todos',
+}
+
+export enum Filter {
+  All = 'all',
+  Active = 'active',
+  Completed = 'completed',
+}
+
+export type FilterType = Filter.All | Filter.Active | Filter.Completed;
 
 export const App: React.FC = () => {
+  const [todos, setTodos] = useState<Todo[]>([]);
+  const [loadingTodoIds, setLoadingTodoIds] = useState<number[]>([]);
+  const [isLoadingTodos, setIsLoadingTodos] = useState(true);
+  const [error, setError] = useState('');
+  const [filter, setFilter] = useState<FilterType>(Filter.All);
+  const [newTitle, setNewTitle] = useState('');
+  const [tempTodo, setTempTodo] = useState<Todo | null>(null);
+  const [isAdding, setIsAdding] = useState(false);
+
+  const inputRef = useRef<HTMLInputElement>(null);
+
+  const startLoading = (id: number) => {
+    setLoadingTodoIds(prev => [...prev, id]);
+  };
+
+  const stopLoading = (id: number) => {
+    setLoadingTodoIds(prev => prev.filter(todoId => todoId !== id));
+  };
+
+  const handleAddTodo = async (e: React.FormEvent) => {
+    e.preventDefault();
+    const trimmed = newTitle.trim();
+
+    if (!trimmed) {
+      setError(ErrorText.EmptyTitle);
+      inputRef.current?.focus();
+
+      return;
+    }
+
+    const temp: Todo = {
+      id: 0,
+      userId: USER_ID,
+      title: trimmed,
+      completed: false,
+    };
+
+    setTempTodo(temp);
+    setIsAdding(true);
+
+    setError('');
+
+    try {
+      const newTodo = await todoService.postTodos({
+        title: trimmed,
+        userId: USER_ID,
+      });
+
+      setTodos(prev => [...prev, newTodo]);
+      setNewTitle('');
+      inputRef.current?.focus();
+    } catch {
+      setError(ErrorText.AddFailed);
+      inputRef.current?.focus();
+    } finally {
+      setIsAdding(false);
+      setTempTodo(null);
+    }
+  };
+
+  useEffect(() => {
+    if (!isAdding && tempTodo === null) {
+      inputRef.current?.focus();
+    }
+  }, [isAdding, tempTodo]);
+
+  const toggleTodo = async (todo: Todo) => {
+    startLoading(todo.id);
+    setError('');
+
+    try {
+      await todoService.patchTodo(todo.id, { completed: !todo.completed });
+      setTodos(prev =>
+        prev.map(existingTodo =>
+          existingTodo.id === todo.id
+            ? { ...existingTodo, completed: !existingTodo.completed }
+            : existingTodo,
+        ),
+      );
+    } catch {
+      setError(ErrorText.UpdateFailed);
+    } finally {
+      stopLoading(todo.id);
+    }
+  };
+
+  const toggleAll = async () => {
+    setError('');
+
+    const areAllCompleted = todos.every(todo => todo.completed);
+    const todosToUpdate = areAllCompleted
+      ? todos
+      : todos.filter(todo => !todo.completed);
+
+    await Promise.all(
+      todosToUpdate.map(async todo => {
+        startLoading(todo.id);
+
+        try {
+          await todoService.patchTodo(todo.id, {
+            completed: areAllCompleted ? false : true,
+          });
+          setTodos(prev =>
+            prev.map(t =>
+              t.id === todo.id
+                ? { ...t, completed: areAllCompleted ? false : true }
+                : t,
+            ),
+          );
+        } catch {
+          setError(ErrorText.UpdateFailed);
+        } finally {
+          stopLoading(todo.id);
+        }
+      }),
+    );
+  };
+
+  const handleUpdateTodo = async (edited: Todo): Promise<boolean> => {
+    startLoading(edited.id);
+    setError('');
+
+    try {
+      const updatedTodo = await todoService.patchTodo(edited.id, {
+        title: edited.title,
+      });
+
+      setTodos(prev =>
+        prev.map(t => (t.id === updatedTodo.id ? updatedTodo : t)),
+      );
+
+      return true;
+    } catch {
+      setError(ErrorText.UpdateFailed);
+
+      return false;
+    } finally {
+      stopLoading(edited.id);
+    }
+  };
+
+  const clearCompleted = async () => {
+    setError('');
+
+    const completed = todos.filter(t => t.completed);
+
+    await Promise.allSettled(
+      completed.map(async todo => {
+        startLoading(todo.id);
+
+        try {
+          await todoService.deleteTodo(todo.id);
+          setTodos(prev => prev.filter(t => t.id !== todo.id));
+        } catch {
+          setError(ErrorText.DeleteFailed);
+        } finally {
+          stopLoading(todo.id);
+        }
+      }),
+    );
+    inputRef.current?.focus();
+  };
+
+  const handleDeleteTodo = async (todoId: number) => {
+    startLoading(todoId);
+    setError('');
+    try {
+      await todoService.deleteTodo(todoId);
+      setTodos(prev => prev.filter(t => t.id !== todoId));
+      inputRef.current?.focus();
+
+      return true;
+    } catch {
+      setError(ErrorText.DeleteFailed);
+
+      return false;
+    } finally {
+      stopLoading(todoId);
+    }
+  };
+
+  const filterTodos = todos.filter(todo => {
+    if (filter === Filter.Active) {
+      return !todo.completed;
+    }
+
+    if (filter === Filter.Completed) {
+      return todo.completed;
+    }
+
+    return true;
+  });
+
+  useEffect(() => {
+    inputRef.current?.focus();
+    setIsLoadingTodos(true);
+    setError('');
+    todoService
+      .getTodos()
+      .then(fetchedTodos => {
+        setTodos(fetchedTodos);
+      })
+      .catch(() => {
+        setError(ErrorText.LoadFailed);
+      })
+      .finally(() => {
+        setIsLoadingTodos(false);
+      });
+  }, []);
+
+  useEffect(() => {
+    if (!error) {
+      return;
+    }
+
+    const timer = setTimeout(() => {
+      setError('');
+    }, 3000);
+
+    return () => clearTimeout(timer);
+  }, [error]);
+
   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
+          todos={todos}
+          toggleAll={toggleAll}
+          isLoadingTodos={isLoadingTodos}
+          newTitle={newTitle}
+          isAdding={isAdding}
+          inputRef={inputRef}
+          onSubmit={handleAddTodo}
+          onTitleChange={setNewTitle}
+        />
+
+        <TodoList
+          todos={filterTodos}
+          tempTodo={tempTodo}
+          loadingTodoIds={loadingTodoIds}
+          onToggledTodo={toggleTodo}
+          onDelete={handleDeleteTodo}
+          onUpdateTodo={handleUpdateTodo}
+        />
+
+        <Footer
+          todos={todos}
+          filter={filter}
+          onFilterChange={setFilter}
+          onClearCompleted={clearCompleted}
+        />
+      </div>
+
+    <ErrorNotification error={error} onErrorDeleat={() => setError('')} />
+    </div>
   );
 };
diff --git a/src/api/todos.ts b/src/api/todos.ts
new file mode 100644
index 0000000000..798339a09d
--- /dev/null
+++ b/src/api/todos.ts
@@ -0,0 +1,24 @@
+import { Todo } from '../types/Todo';
+import { client } from '../ulits/fetchClient';
+
+export const USER_ID = 3968;
+
+export const getTodos = () => {
+  return client.get<Todo[]>(`/todos?userId=${USER_ID}`);
+};
+
+// Add more methods here
+export const postTodos = ({
+  title,
+  userId,
+}: Omit<Todo, 'id' | 'completed'>) => {
+  return client.post<Todo>(`/todos`, { title, userId, completed: false });
+};
+
+export const patchTodo = (id: number, data: Partial<Todo>) => {
+  return client.patch<Todo>(`/todos/${id}`, data);
+};
+
+export const deleteTodo = (id: number) => {
+  return client.delete<void>(`/todos/${id}`);
+};
diff --git a/src/component/Error.tsx b/src/component/Error.tsx
new file mode 100644
index 0000000000..4480a30602
--- /dev/null
+++ b/src/component/Error.tsx
@@ -0,0 +1,31 @@
+import classNames from 'classnames';
+import React from 'react';
+type Props = {
+  error: string;
+  onErrorDeleat: () => void;
+};
+
+export const ErrorNotification: React.FC<Props> = ({
+  error,
+  onErrorDeleat,
+}) => {
+  return (
+    <>
+      <div
+        data-cy="ErrorNotification"
+        className={classNames(
+          'notification is-danger is-light has-text-weight-normal',
+          { hidden: !error },
+        )}
+      >
+        <button
+          data-cy="HideErrorButton"
+          type="button"
+          className="delete"
+          onClick={() => onErrorDeleat()}
+        />
+        {error}
+      </div>
+    </>
+  );
+};
diff --git a/src/component/Footer.tsx b/src/component/Footer.tsx
new file mode 100644
index 0000000000..a49916ac3b
--- /dev/null
+++ b/src/component/Footer.tsx
@@ -0,0 +1,57 @@
+import classNames from 'classnames';
+import React from 'react';
+import { Todo } from '../types/Todo';
+import { Filter, FilterType } from '../App';
+type Props = {
+  todos: Todo[];
+  filter: FilterType;
+  onFilterChange: (filter: Filter) => void;
+  onClearCompleted: () => void;
+};
+
+export const Footer: React.FC<Props> = ({
+  todos,
+  filter,
+  onFilterChange,
+  onClearCompleted,
+}) => {
+  const filtersValues = Object.values(Filter);
+
+  return (
+    <>
+      {todos.length > 0 && (
+        <footer className="todoapp__footer" data-cy="Footer">
+          <span className="todo-count" data-cy="TodosCounter">
+            {todos.filter(todo => !todo.completed).length} items left
+          </span>
+
+          <nav className="filter" data-cy="Filter">
+            {filtersValues.map(f => (
+              <a
+                key={f}
+                href={`#/${f === 'all' ? '' : f}`}
+                className={classNames('filter__link', {
+                  selected: filter === f,
+                })}
+                data-cy={`FilterLink${f.charAt(0).toUpperCase() + f.slice(1)}`}
+                onClick={() => onFilterChange(f as Filter)}
+              >
+                {f.charAt(0).toUpperCase() + f.slice(1)}
+              </a>
+            ))}
+          </nav>
+
+          <button
+            disabled={!todos.some(todo => todo.completed)}
+            type="button"
+            className="todoapp__clear-completed"
+            data-cy="ClearCompletedButton"
+            onClick={() => onClearCompleted()}
+          >
+            Clear completed
+          </button>
+        </footer>
+      )}
+    </>
+  );
+};
diff --git a/src/component/Header.tsx b/src/component/Header.tsx
new file mode 100644
index 0000000000..051ad94e4a
--- /dev/null
+++ b/src/component/Header.tsx
@@ -0,0 +1,58 @@
+import classNames from 'classnames';
+import React from 'react';
+import { Todo } from '../types/Todo';
+type Props = {
+  todos: Todo[];
+  newTitle: string;
+  isAdding: boolean;
+  isLoadingTodos: boolean;
+  inputRef: React.RefObject<HTMLInputElement>;
+  toggleAll: () => void;
+  onSubmit: (e: React.FormEvent) => void;
+  onTitleChange: (value: string) => void;
+};
+
+export const Header: React.FC<Props> = ({
+  todos,
+  newTitle,
+  isAdding,
+  isLoadingTodos,
+  inputRef,
+  toggleAll,
+  onSubmit,
+  onTitleChange,
+}) => {
+  const handleTitleChange = (e: React.ChangeEvent<HTMLInputElement>) => {
+    onTitleChange(e.target.value);
+  };
+
+  return (
+    <>
+      <header className="todoapp__header">
+        {!isLoadingTodos && todos.length > 0 && (
+          <button
+            type="button"
+            onClick={toggleAll}
+            className={classNames('todoapp__toggle-all', {
+              active: todos.length > 0 && todos.every(todo => todo.completed),
+            })}
+            data-cy="ToggleAllButton"
+          />
+        )}
+
+        <form onSubmit={onSubmit}>
+          <input
+            ref={inputRef}
+            disabled={isAdding}
+            data-cy="NewTodoField"
+            type="text"
+            className="todoapp__new-todo"
+            placeholder="What needs to be done?"
+            value={newTitle}
+            onChange={handleTitleChange}
+          />
+        </form>
+      </header>
+    </>
+  );
+};
diff --git a/src/component/TodoList.tsx b/src/component/TodoList.tsx
new file mode 100644
index 0000000000..6c7fe141c8
--- /dev/null
+++ b/src/component/TodoList.tsx
@@ -0,0 +1,158 @@
+import classNames from 'classnames';
+import React, { useEffect, useRef, useState } from 'react';
+import { Todo } from '../types/Todo';
+type Props = {
+  todos: Todo[];
+  tempTodo: Todo | null;
+  loadingTodoIds: number[];
+  onToggledTodo: (todo: Todo) => void;
+  onDelete: (id: number) => Promise<boolean>;
+  onUpdateTodo: (todo: Todo) => Promise<boolean>;
+};
+
+export const TodoList: React.FC<Props> = ({
+  todos,
+  tempTodo,
+  loadingTodoIds,
+  onToggledTodo,
+  onDelete,
+  onUpdateTodo,
+}) => {
+  const [editingTodo, setEditingTodo] = useState<Todo | null>(null);
+  const visibleTodos = [...todos, ...(tempTodo ? [tempTodo] : [])];
+  const handleChangeTitle = (e: React.ChangeEvent<HTMLInputElement>) => {
+    setEditingTodo(prev => (prev ? { ...prev, title: e.target.value } : prev));
+  };
+
+  const inputRef = useRef<HTMLInputElement>(null);
+
+  const handleKeyDown = (e: React.KeyboardEvent<HTMLInputElement>) => {
+    if (e.key === 'Escape') {
+      setEditingTodo(null);
+    }
+
+    if (e.key === 'Enter') {
+      if (editingTodo === null) {
+        return;
+      }
+
+      inputRef.current?.blur();
+    }
+  };
+
+  const handleSaveEdited = async () => {
+    if (!editingTodo) {
+      return;
+    }
+
+    if (loadingTodoIds.includes(editingTodo.id)) {
+      return;
+    }
+
+    const original = todos.find(t => t.id === editingTodo.id);
+
+    if (!original) {
+      setEditingTodo(null);
+
+      return;
+    }
+
+    const newTitle = editingTodo.title.trim();
+
+    if (newTitle === original.title) {
+      setEditingTodo(null);
+
+      return;
+    }
+
+    if (newTitle === '') {
+      const success = await onDelete(editingTodo.id);
+
+      if (success) {
+        setEditingTodo(null);
+      }
+
+      return;
+    }
+
+    const success = await onUpdateTodo({
+      ...editingTodo,
+      title: newTitle,
+    });
+
+    if (success) {
+      setEditingTodo(null);
+    }
+  };
+
+  useEffect(() => {
+    if (editingTodo) {
+      inputRef.current?.focus();
+    }
+  }, [editingTodo]);
+
+  return (
+    <>
+      <section className="todoapp__main" data-cy="TodoList">
+        {visibleTodos.map(todo => (
+          <div
+            data-cy="Todo"
+            className={classNames('todo', { completed: todo.completed })}
+            key={todo.id}
+          >
+            <label className="todo__status-label" aria-label="Toggle todo">
+              <input
+                data-cy="TodoStatus"
+                type="checkbox"
+                className="todo__status"
+                checked={todo.completed}
+                onChange={() => onToggledTodo(todo)}
+              />
+            </label>
+            {editingTodo?.id === todo.id ? (
+              <input
+                data-cy="TodoTitleField"
+                ref={inputRef}
+                className="todo__title todo__title-field"
+                value={editingTodo?.title}
+                onBlur={handleSaveEdited}
+                onChange={handleChangeTitle}
+                onKeyDown={handleKeyDown}
+              />
+            ) : (
+              <>
+                <span
+                  data-cy="TodoTitle"
+                  className="todo__title"
+                  onDoubleClick={() => setEditingTodo({ ...todo })}
+                >
+                  {todo.title}
+                </span>
+
+                <button
+                  type="button"
+                  className="todo__remove"
+                  data-cy="TodoDelete"
+                  onClick={() => onDelete(todo.id)}
+                >
+                  ×
+                </button>
+              </>
+            )}
+
+            <div
+              data-cy="TodoLoader"
+              className={classNames('modal overlay', {
+                'is-active':
+                  loadingTodoIds.includes(todo.id) || tempTodo?.id === todo.id,
+              })}
+            >
+              <div className="modal-background has-background-white-ter" />
+              <div className="loader" />
+            </div>
+          </div>
+        ))}
+      </section>
+    </>
+  );
+};
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/ulits/fetchClient.ts b/src/ulits/fetchClient.ts
new file mode 100644
index 0000000000..ed09fc6ecc
--- /dev/null
+++ b/src/ulits/fetchClient.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(`${response.status} ${response.statusText}`);
+      }
+
+      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: <T>(url: string) => request<T>(url, 'DELETE'),
+};