diff --git a/src/App.tsx b/src/App.tsx
index 81e011f432..db88f10cff 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -1,26 +1,154 @@
-/* eslint-disable max-len */
-/* eslint-disable jsx-a11y/control-has-associated-label */
-import React from 'react';
-import { UserWarning } from './UserWarning';
-
-const USER_ID = 0;
+import React, { FormEvent, useMemo, useState, useEffect } from 'react';
+import cn from 'classnames';
+import { Todo } from './types/Todo';
+import { Header } from './components/Header';
+import { TodoList } from './components/TodoList';
+import { getTodos } from './api/todos';
+import { FooterPart } from './components/Footer';
+import { ErrorMessage } from './components/errorsMessage';
+import { Status } from './components/status';
+import { createTodos, USER_ID } from './api/todos';
 
 export const App: React.FC = () => {
-  if (!USER_ID) {
-    return <UserWarning />;
+  const [todos, setTodos] = useState<Todo[]>([]);
+
+  const [todoTemplate, setTodoTempalte] = useState<Todo | null>(null);
+  const [error, setError] = useState<ErrorMessage | ''>('');
+  const [status, setStatus] = useState<Status>(Status.All);
+  const [valueTitle, setValue] = useState<string>('');
+  const [disableInput, setDisableInput] = useState(false);
+
+  const uploadingTodos = useMemo(() => {
+    setError(ErrorMessage.noError);
+
+    getTodos()
+      .then(setTodos)
+      .catch(() => {
+        setError(ErrorMessage.loadError);
+        setTimeout(() => {
+          setError(ErrorMessage.noError);
+        }, 3000);
+      })
+      .finally();
+  }, []);
+
+  function deleteError() {
+    setError(ErrorMessage.noError);
   }
 
+  const addPost = (e: FormEvent<HTMLFormElement>) => {
+    e.preventDefault();
+    const getTrim = valueTitle.trim();
+
+    if (!getTrim) {
+      setValue('');
+      setError(ErrorMessage.titleError);
+      setTimeout(() => setError(ErrorMessage.noError), 3000);
+
+      return false;
+    }
+
+    setDisableInput(true);
+    setTodoTempalte({
+      id: 0,
+      completed: false,
+      title: getTrim,
+      userId: USER_ID,
+    });
+    todos.filter((todo: Todo) => !todo.completed);
+    setTodos(currentTodos => [
+      ...currentTodos,
+      { id: 0, completed: false, title: getTrim, userId: USER_ID },
+    ]);
+
+    return createTodos({ completed: false, title: getTrim, userId: USER_ID })
+      .then(newTodo => {
+        setTodos(currentTodos => [...currentTodos, newTodo]);
+        setValue('');
+      })
+      .catch(() => {
+        setError(ErrorMessage.addError);
+        setTimeout(() => {
+          setError(ErrorMessage.noError);
+        }, 3000);
+      })
+      .finally(() => {
+        setTodos(currentTodos => currentTodos.filter(todo => todo.id !== 0));
+        setTodoTempalte(null);
+        setDisableInput(false);
+      });
+  };
+
+  const filterTodosByStatus = () => {
+    switch (status) {
+      case Status.Active:
+        return todos.filter((todo: Todo) => !todo.completed);
+      case Status.Completed:
+        return todos.filter((todo: Todo) => todo.completed);
+      default:
+        return todos;
+    }
+  };
+
+  const filteredTodos = filterTodosByStatus();
+
+  useEffect(() => uploadingTodos);
+
   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
+          setTodos={setTodos}
+          setIsInputLoading={todos.length}
+          posts={todos}
+          setTodoTemplate={setTodoTempalte}
+          addPost={addPost}
+          valueTitle={valueTitle}
+          setValue={setValue}
+          disableInput={disableInput}
+          setErrorMessage={setError}
+        />
+        <TodoList
+          posts={filteredTodos}
+          setTodos={setTodos}
+          error={error}
+          setErrorMessage={setError}
+          todoTemplate={todoTemplate}
+        />
+        {todos.length > 0 && (
+          <FooterPart
+            posts={todos}
+            filterStatus={setStatus}
+            status={status}
+            setTodos={setTodos}
+            todoTemplate={todoTemplate}
+            setErrorMessage={setError}
+          />
+        )}
+      </div>
+
+      <div
+        data-cy="ErrorNotification"
+        className={cn(
+          'notification',
+          'is-danger',
+          'is-light',
+          'has-text-weight-normal',
+          {
+            hidden: !error,
+          },
+        )}
+      >
+        <button
+          data-cy="HideErrorButton"
+          onClick={deleteError}
+          type="button"
+          className="delete"
+        />
+        {error}
+      </div>
+    </div>
   );
 };
diff --git a/src/api/todos.ts b/src/api/todos.ts
new file mode 100644
index 0000000000..cd516728bf
--- /dev/null
+++ b/src/api/todos.ts
@@ -0,0 +1,31 @@
+import { Todo } from '../types/Todo';
+import { client } from '../utils/fetchClient';
+
+export const USER_ID = 1843;
+
+// interface UpdateTodo {
+//   id: Todo['id'];
+//   objectData: Todo;
+// }
+
+export const getTodos = () => {
+  return client.get<Todo[]>(`/todos?userId=${USER_ID}`);
+};
+
+export const createTodos = (obj: Omit<Todo, 'id'>) => {
+  return client.post<Todo[]>('/todos', obj);
+};
+
+export const updateTodos = ({
+  id,
+  userId,
+  title,
+  completed,
+}: Todo): Promise<Todo> => {
+  return client.patch(`/todos/${id}`, { userId, title, completed });
+};
+
+export const deleteTodos = (id: number) => {
+  return client.delete(`/todos/${id}`);
+};
+// Add more methods here
diff --git a/src/components/Footer.tsx b/src/components/Footer.tsx
new file mode 100644
index 0000000000..c44b6e9716
--- /dev/null
+++ b/src/components/Footer.tsx
@@ -0,0 +1,80 @@
+import React from 'react';
+import { Todo } from '../types/Todo';
+import { Status } from './status';
+import { deleteTodos } from '../api/todos';
+import { ErrorMessage } from './errorsMessage';
+import cn from 'classnames';
+
+interface Props {
+  posts: Todo[];
+  filterStatus: (status: Status) => void;
+  status: Status;
+  setErrorMessage: (errorMessage: ErrorMessage) => void;
+  setTodos: React.Dispatch<React.SetStateAction<Todo[]>>;
+  todoTemplate: Todo | null;
+}
+
+export const FooterPart: React.FC<Props> = ({
+  posts,
+  filterStatus,
+  status,
+  setTodos,
+  todoTemplate,
+  setErrorMessage,
+}) => {
+  const count = posts.filter(
+    value => !value.completed && todoTemplate != value && value.id != 0,
+  ).length;
+  const deleteComplete = () => {
+    posts.map(value => {
+      if (value.completed) {
+        deleteTodos(value.id)
+          .then(() => {
+            setTodos(currentTodos =>
+              currentTodos.filter(todo => todo.id !== value.id),
+            );
+          })
+          .catch(() => {
+            setErrorMessage(ErrorMessage.deleteError);
+            setTimeout(() => {
+              setErrorMessage(ErrorMessage.noError);
+            }, 3000);
+          });
+      }
+    });
+  };
+
+  return (
+    <footer className="todoapp__footer" data-cy="Footer">
+      <span className="todo-count" data-cy="TodosCounter">
+        {count} items left
+      </span>
+      <nav className="filter" data-cy="Filter">
+        {Object.values(Status).map(val => (
+          <a
+            key={val}
+            href={`#/${val.toLowerCase()}`}
+            className={cn('filter__link', {
+              selected: status === val,
+            })}
+            data-cy={`FilterLink${val}`}
+            onClick={() => filterStatus(val)}
+          >
+            {val}
+          </a>
+        ))}
+      </nav>
+
+      {/* this button should be disabled if there are no completed todos */}
+      <button
+        type="button"
+        className="todoapp__clear-completed"
+        data-cy="ClearCompletedButton"
+        disabled={!posts.find(element => element.completed)}
+        onClick={deleteComplete}
+      >
+        Clear completed
+      </button>
+    </footer>
+  );
+};
diff --git a/src/components/Header.tsx b/src/components/Header.tsx
new file mode 100644
index 0000000000..8579c01e6c
--- /dev/null
+++ b/src/components/Header.tsx
@@ -0,0 +1,102 @@
+import cn from 'classnames';
+import React, { ChangeEvent, FormEvent, useEffect, useRef } from 'react';
+import { updateTodos, USER_ID } from '../api/todos';
+import { Todo } from '../types/Todo';
+import { ErrorMessage } from './errorsMessage';
+
+type Props = {
+  setTodos: React.Dispatch<React.SetStateAction<Todo[]>>;
+  setErrorMessage: (errorMessage: ErrorMessage) => void;
+  posts: Todo[];
+  disableInput?: boolean;
+  setIsInputLoading: number;
+  setTodoTemplate: React.Dispatch<React.SetStateAction<Todo | null>>;
+  valueTitle: string;
+  setValue: React.Dispatch<React.SetStateAction<string>>;
+  addPost: (event: FormEvent<HTMLFormElement>) => void;
+};
+
+export const Header: React.FC<Props> = ({
+  setTodos,
+  setErrorMessage,
+  posts,
+  setIsInputLoading,
+  addPost,
+  valueTitle,
+  setValue,
+  disableInput,
+}) => {
+  const fieldFocus = useRef<HTMLInputElement>(null);
+
+  useEffect(() => {
+    if (fieldFocus.current) {
+      fieldFocus.current.focus();
+    }
+  }, [setIsInputLoading, posts]);
+  const areAllCompleted = posts.every((todo: Todo) => todo.completed);
+
+  const setCompleted = () => {
+    let flag = true;
+
+    if (areAllCompleted) {
+      flag = false;
+    }
+
+    posts.map(post => {
+      const id = post.id;
+
+      if (post.completed != flag) {
+        updateTodos({
+          id: id,
+          userId: USER_ID,
+          title: post.title,
+          completed: flag,
+        })
+          .then(respone => {
+            setTodos(prevTodos =>
+              prevTodos.map((item: Todo) =>
+                item.id === respone.id ? respone : item,
+              ),
+            );
+          })
+          .catch(() => {
+            setErrorMessage(ErrorMessage.updateError);
+            setTimeout(() => {
+              setErrorMessage(ErrorMessage.noError);
+            }, 3000);
+          });
+      }
+    });
+  };
+
+  const onTextChange = (e: ChangeEvent<HTMLInputElement>) => {
+    setValue(e.target.value);
+  };
+
+  return (
+    <header className="todoapp__header">
+      {posts.length !== 0 && (
+        <button
+          type="button"
+          data-cy="ToggleAllButton"
+          className={cn('todoapp__toggle-all', {
+            active: areAllCompleted,
+          })}
+          onClick={setCompleted}
+        />
+      )}
+      <form onSubmit={event => addPost(event)}>
+        <input
+          ref={fieldFocus}
+          data-cy="NewTodoField"
+          type="text"
+          onChange={onTextChange}
+          value={valueTitle}
+          className="todoapp__new-todo"
+          placeholder="What needs to be done?"
+          disabled={disableInput}
+        />
+      </form>
+    </header>
+  );
+};
diff --git a/src/components/TodoItems.tsx b/src/components/TodoItems.tsx
new file mode 100644
index 0000000000..2bcd050df4
--- /dev/null
+++ b/src/components/TodoItems.tsx
@@ -0,0 +1,252 @@
+import React, { ChangeEvent, useState } from 'react';
+import cn from 'classnames';
+import { Todo } from '../types/Todo';
+import { deleteTodos, updateTodos, USER_ID } from '../api/todos';
+import { ErrorMessage } from './errorsMessage';
+
+type ItemProps = {
+  todoTemplate: Todo | null;
+  post: Todo;
+  setErrorMessage: (errorMessage: ErrorMessage) => void;
+  setTodos: React.Dispatch<React.SetStateAction<Todo[]>>;
+  error: ErrorMessage | '';
+};
+export const TodoItems: React.FC<ItemProps> = ({
+  post,
+  todoTemplate,
+  setErrorMessage,
+  setTodos,
+  error,
+}) => {
+  const { completed, id, title } = post;
+  const [focusItems, setFocusItems] = useState(false);
+  const [inputTitle, setInputTitle] = useState(title);
+  const [deleteCheck, setDeleteCheck] = useState(false);
+
+  const saveInputOnBlur = () => {
+    const trimValueBlur = inputTitle.trim();
+
+    if (trimValueBlur == '') {
+      deleteTodos(post.id)
+        .then(() => {
+          setFocusItems(false);
+          setTodos(currentTodos => currentTodos.filter(todo => todo.id !== id));
+        })
+        .catch(() => {
+          setFocusItems(true);
+          setErrorMessage(ErrorMessage.deleteError);
+          setTimeout(() => {
+            setErrorMessage(ErrorMessage.noError);
+          }, 3000);
+        })
+        .finally(() => {
+          if (error == '') {
+            setFocusItems(false);
+          }
+
+          setDeleteCheck(false);
+        });
+    } else {
+      setInputTitle(trimValueBlur);
+      updateTodos({
+        id: post.id,
+        userId: USER_ID,
+        title: trimValueBlur,
+        completed: completed,
+      })
+        .then(respone => {
+          setFocusItems(false);
+          setTodos(prevTodos =>
+            prevTodos.map((item: Todo) =>
+              item.id === respone.id ? respone : item,
+            ),
+          );
+        })
+
+        .catch(() => {
+          setErrorMessage(ErrorMessage.updateError);
+          setFocusItems(true);
+          setTimeout(() => {
+            setErrorMessage(ErrorMessage.noError);
+          }, 3000);
+        })
+        .finally(() => {
+          setDeleteCheck(false);
+        });
+    }
+  };
+
+  const saveInput = (evt: React.KeyboardEvent<HTMLInputElement>) => {
+    if (evt.key === 'Enter') {
+      const trimValue = inputTitle.trim();
+
+      if (trimValue == '') {
+        setDeleteCheck(true);
+
+        deleteTodos(id)
+          .then(() => {
+            setFocusItems(false);
+            setTodos(currentTodos =>
+              currentTodos.filter(todo => todo.id !== id),
+            );
+          })
+          .catch(() => {
+            setFocusItems(true);
+            setErrorMessage(ErrorMessage.deleteError);
+            setTimeout(() => {
+              setErrorMessage(ErrorMessage.noError);
+            }, 3000);
+          })
+          .finally(() => {
+            setDeleteCheck(false);
+          });
+      } else {
+        setDeleteCheck(true);
+        setFocusItems(false);
+        setInputTitle(trimValue.trim());
+        updateTodos({
+          id: id,
+          userId: USER_ID,
+          title: trimValue,
+          completed: completed,
+        })
+          .then(respone => {
+            setTodos(prevTodos =>
+              prevTodos.map((item: Todo) =>
+                item.id === respone.id ? respone : item,
+              ),
+            );
+            setFocusItems(false);
+          })
+          .catch(() => {
+            setFocusItems(true);
+
+            setErrorMessage(ErrorMessage.updateError);
+            setTimeout(() => {
+              setErrorMessage(ErrorMessage.noError);
+            }, 3000);
+          })
+          .finally(() => {
+            setDeleteCheck(false);
+          });
+      }
+    }
+
+    if (evt.key === 'Escape') {
+      setFocusItems(false);
+      setInputTitle(post.title.trim());
+    }
+  };
+
+  const toggleCompleted = (todo: Todo) => {
+    const updatedTodo: Todo = {
+      id: todo.id,
+      userId: todo.userId,
+      title: todo.title,
+      completed: !todo.completed,
+    };
+
+    setDeleteCheck(true);
+
+    updateTodos(updatedTodo)
+      .then(respone => {
+        setTodos(prevTodos =>
+          prevTodos.map((item: Todo) =>
+            item.id === respone.id ? respone : item,
+          ),
+        );
+      })
+      .catch(() => {
+        setErrorMessage(ErrorMessage.updateError);
+        setTimeout(() => {
+          setErrorMessage(ErrorMessage.noError);
+        }, 3000);
+      })
+      .finally(() => {
+        setDeleteCheck(false);
+      });
+  };
+
+  const onDelete = () => {
+    setDeleteCheck(true);
+    deleteTodos(post.id)
+      .then(() => {
+        setTodos(currentTodos => currentTodos.filter(todo => todo.id !== id));
+      })
+      .catch(() => {
+        setErrorMessage(ErrorMessage.deleteError);
+        setTimeout(() => {
+          setErrorMessage(ErrorMessage.noError);
+        }, 3000);
+      })
+      .finally(() => {
+        setDeleteCheck(false);
+      });
+  };
+
+  const doubleClickItem = () => {
+    setFocusItems(true);
+  };
+
+  const onTextChange = (e: ChangeEvent<HTMLInputElement>) => {
+    setInputTitle(e.target.value);
+  };
+
+  return (
+    <div
+      key={id}
+      data-cy="Todo"
+      className={cn('todo', { completed: post.completed })}
+    >
+      <label className="todo__status-label">
+        {''}
+        <input
+          data-cy="TodoStatus"
+          type="checkbox"
+          className="todo__status"
+          checked={post.completed}
+          onChange={() => toggleCompleted(post)}
+        />
+      </label>
+      {focusItems ? (
+        <input
+          data-cy="TodoTitleField"
+          className="todo__title-field"
+          type="text"
+          placeholder="Empty todo will be deleted"
+          onKeyDown={saveInput}
+          value={inputTitle}
+          onChange={onTextChange}
+          onBlur={saveInputOnBlur}
+          autoFocus={focusItems}
+        />
+      ) : (
+        <>
+          <span
+            data-cy="TodoTitle"
+            onDoubleClick={doubleClickItem}
+            className="todo__title"
+          >
+            {inputTitle}
+          </span>
+          <button
+            type="button"
+            className="todo__remove"
+            data-cy="TodoDelete"
+            onClick={onDelete}
+          >
+            ×
+          </button>
+        </>
+      )}
+
+      <div
+        data-cy="TodoLoader"
+        className={`modal overlay ${todoTemplate?.id === post.id || deleteCheck ? 'is-active' : ''}`}
+      >
+        <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..0ff0ad4b0c
--- /dev/null
+++ b/src/components/TodoList.tsx
@@ -0,0 +1,34 @@
+import { Todo } from '../types/Todo';
+import { TodoItems } from './TodoItems';
+import { ErrorMessage } from './errorsMessage';
+
+type Props = {
+  posts: Todo[];
+  setTodos: React.Dispatch<React.SetStateAction<Todo[]>>;
+  setErrorMessage: (errorMessage: ErrorMessage) => void;
+  todoTemplate: Todo | null;
+  error: ErrorMessage | '';
+};
+
+export const TodoList: React.FC<Props> = ({
+  posts,
+  todoTemplate,
+  setTodos,
+  error,
+  setErrorMessage,
+}) => {
+  return (
+    <section className="todoapp__main" data-cy="TodoList">
+      {posts.map(post => (
+        <TodoItems
+          key={post.id}
+          todoTemplate={todoTemplate}
+          post={post}
+          error={error}
+          setTodos={setTodos}
+          setErrorMessage={setErrorMessage}
+        />
+      ))}
+    </section>
+  );
+};
diff --git a/src/components/errorsMessage.ts b/src/components/errorsMessage.ts
new file mode 100644
index 0000000000..b5f01c89e1
--- /dev/null
+++ b/src/components/errorsMessage.ts
@@ -0,0 +1,8 @@
+export enum ErrorMessage {
+  noError = '',
+  loadError = 'Unable to load todos',
+  titleError = 'Title should not be empty',
+  addError = 'Unable to add a todo',
+  deleteError = 'Unable to delete a todo',
+  updateError = 'Unable to update a todo',
+}
diff --git a/src/components/status.ts b/src/components/status.ts
new file mode 100644
index 0000000000..dc864cc93b
--- /dev/null
+++ b/src/components/status.ts
@@ -0,0 +1,5 @@
+export enum Status {
+  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..28c946e7f6
--- /dev/null
+++ b/src/utils/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: (url: string) => request(url, 'DELETE'),
+};