diff --git a/src/App.tsx b/src/App.tsx
index a399287bd..7edee84ff 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -1,156 +1,23 @@
 /* eslint-disable jsx-a11y/control-has-associated-label */
-import React from 'react';
+import React, { useContext } from 'react';
+import { StateContext } from './components/Store';
+import { Header } from './components/Header';
+import { TodoList } from './components/TodoList';
+import { Footer } from './components/Footer';
 
 export const App: React.FC = () => {
+  const { todos } = useContext(StateContext);
+
   return (
     <div className="todoapp">
       <h1 className="todoapp__title">todos</h1>
 
       <div className="todoapp__content">
-        <header className="todoapp__header">
-          {/* this button should have `active` class only if all todos are completed */}
-          <button
-            type="button"
-            className="todoapp__toggle-all active"
-            data-cy="ToggleAllButton"
-          />
-
-          {/* Add a todo on form submit */}
-          <form>
-            <input
-              data-cy="NewTodoField"
-              type="text"
-              className="todoapp__new-todo"
-              placeholder="What needs to be done?"
-            />
-          </form>
-        </header>
-
-        <section className="todoapp__main" data-cy="TodoList">
-          {/* This is a completed todo */}
-          <div data-cy="Todo" className="todo completed">
-            <label className="todo__status-label">
-              <input
-                data-cy="TodoStatus"
-                type="checkbox"
-                className="todo__status"
-                checked
-              />
-            </label>
-
-            <span data-cy="TodoTitle" className="todo__title">
-              Completed Todo
-            </span>
-
-            {/* Remove button appears only on hover */}
-            <button type="button" className="todo__remove" data-cy="TodoDelete">
-              ×
-            </button>
-          </div>
-
-          {/* This todo is an active todo */}
-          <div data-cy="Todo" className="todo">
-            <label className="todo__status-label">
-              <input
-                data-cy="TodoStatus"
-                type="checkbox"
-                className="todo__status"
-              />
-            </label>
-
-            <span data-cy="TodoTitle" className="todo__title">
-              Not Completed Todo
-            </span>
-
-            <button type="button" className="todo__remove" data-cy="TodoDelete">
-              ×
-            </button>
-          </div>
-
-          {/* This todo is being edited */}
-          <div data-cy="Todo" className="todo">
-            <label className="todo__status-label">
-              <input
-                data-cy="TodoStatus"
-                type="checkbox"
-                className="todo__status"
-              />
-            </label>
-
-            {/* This form is shown instead of the title and remove button */}
-            <form>
-              <input
-                data-cy="TodoTitleField"
-                type="text"
-                className="todo__title-field"
-                placeholder="Empty todo will be deleted"
-                value="Todo is being edited now"
-              />
-            </form>
-          </div>
-
-          {/* This todo is in loadind state */}
-          <div data-cy="Todo" className="todo">
-            <label className="todo__status-label">
-              <input
-                data-cy="TodoStatus"
-                type="checkbox"
-                className="todo__status"
-              />
-            </label>
-
-            <span data-cy="TodoTitle" className="todo__title">
-              Todo is being saved now
-            </span>
-
-            <button type="button" className="todo__remove" data-cy="TodoDelete">
-              ×
-            </button>
-          </div>
-        </section>
-
-        {/* Hide the footer if there are no todos */}
-        <footer className="todoapp__footer" data-cy="Footer">
-          <span className="todo-count" data-cy="TodosCounter">
-            3 items left
-          </span>
-
-          {/* Active link should have the 'selected' class */}
-          <nav className="filter" data-cy="Filter">
-            <a
-              href="#/"
-              className="filter__link selected"
-              data-cy="FilterLinkAll"
-            >
-              All
-            </a>
-
-            <a
-              href="#/active"
-              className="filter__link"
-              data-cy="FilterLinkActive"
-            >
-              Active
-            </a>
+        <Header />
 
-            <a
-              href="#/completed"
-              className="filter__link"
-              data-cy="FilterLinkCompleted"
-            >
-              Completed
-            </a>
-          </nav>
+        <TodoList />
 
-          {/* this button should be disabled if there are no completed todos */}
-          <button
-            type="button"
-            className="todoapp__clear-completed"
-            data-cy="ClearCompletedButton"
-          >
-            Clear completed
-          </button>
-        </footer>
+        {!!todos.length && <Footer />}
       </div>
     </div>
   );
diff --git a/src/components/Footer.tsx b/src/components/Footer.tsx
new file mode 100644
index 000000000..897dd70ab
--- /dev/null
+++ b/src/components/Footer.tsx
@@ -0,0 +1,51 @@
+import { useContext } from 'react';
+import cn from 'classnames';
+import { DispatchContext, StateContext } from './Store';
+import { getActiveTodosArray, getCompletedTodosArray } from '../services';
+import { FilterTodos } from '../types/FilterTodos';
+
+export const Footer = () => {
+  const { todos, filter } = useContext(StateContext);
+  const dispatch = useContext(DispatchContext);
+
+  return (
+    <footer className="todoapp__footer" data-cy="Footer">
+      <span className="todo-count" data-cy="TodosCounter">
+        {getActiveTodosArray(todos).length} items left
+      </span>
+
+      <nav className="filter" data-cy="Filter">
+        {Object.values(FilterTodos).map(status => (
+          <a
+            key={status}
+            href={`#/${status}`}
+            className={cn('filter__link', {
+              selected: filter === status,
+            })}
+            data-cy={`FilterLink${status}`}
+            onClick={() =>
+              dispatch({
+                type: 'setFilterByStatus',
+                payload: status,
+              })
+            }
+          >
+            {status}
+          </a>
+        ))}
+      </nav>
+
+      <button
+        type="button"
+        className="todoapp__clear-completed"
+        data-cy="ClearCompletedButton"
+        disabled={getCompletedTodosArray(todos).length === 0}
+        onClick={() => {
+          dispatch({ type: 'clearAllCompleted' });
+        }}
+      >
+        Clear completed
+      </button>
+    </footer>
+  );
+};
diff --git a/src/components/Header.tsx b/src/components/Header.tsx
new file mode 100644
index 000000000..616ea0846
--- /dev/null
+++ b/src/components/Header.tsx
@@ -0,0 +1,74 @@
+import { FormEvent, useContext, useEffect, useRef } from 'react';
+import classNames from 'classnames';
+import { DispatchContext, StateContext } from './Store';
+import { Todo } from '../types/Todo';
+import { getCompletedTodosArray } from '../services';
+
+export const Header = () => {
+  const { todos, newTodoTitle } = useContext(StateContext);
+  const dispatch = useContext(DispatchContext);
+
+  const inputRef = useRef<HTMLInputElement>(null);
+
+  useEffect(() => {
+    if (inputRef.current) {
+      inputRef.current.focus();
+    }
+  });
+
+  const handleSetNewTodoTitle = (
+    event: React.ChangeEvent<HTMLInputElement>,
+  ) => {
+    dispatch({ type: 'setNewTodoTitle', payload: event.target.value });
+  };
+
+  const handleAddTodo = (event: FormEvent<HTMLFormElement>) => {
+    event.preventDefault();
+
+    if (!newTodoTitle.trim()) {
+      return;
+    }
+
+    const newTodo: Todo = {
+      id: +new Date(),
+      title: newTodoTitle.trim(),
+      completed: false,
+    };
+
+    dispatch({ type: 'addTodo', payload: newTodo });
+    dispatch({ type: 'setNewTodoTitle', payload: '' });
+  };
+
+  const validation = todos.every(todo => todo.completed === true);
+
+  const handleToggleAll = () => {
+    dispatch({ type: 'setAllCompleted', payload: !validation });
+  };
+
+  return (
+    <header className="todoapp__header">
+      {!!todos.length && (
+        <button
+          type="button"
+          className={classNames('todoapp__toggle-all', {
+            active: todos.length === getCompletedTodosArray(todos).length,
+          })}
+          data-cy="ToggleAllButton"
+          onClick={handleToggleAll}
+        />
+      )}
+
+      <form onSubmit={handleAddTodo}>
+        <input
+          ref={inputRef}
+          data-cy="NewTodoField"
+          type="text"
+          className="todoapp__new-todo"
+          placeholder="What needs to be done?"
+          value={newTodoTitle}
+          onChange={handleSetNewTodoTitle}
+        />
+      </form>
+    </header>
+  );
+};
diff --git a/src/components/Store.tsx b/src/components/Store.tsx
new file mode 100644
index 000000000..aeb680371
--- /dev/null
+++ b/src/components/Store.tsx
@@ -0,0 +1,123 @@
+import React, { useEffect, useReducer } from 'react';
+import { Todo } from '../types/Todo';
+import { TodoStatus } from '../types/TodoStatus';
+import { FilterTodos } from '../types/FilterTodos';
+
+type State = {
+  todos: Todo[];
+  newTodoTitle: string;
+  status: TodoStatus;
+  filter: FilterTodos;
+};
+
+const getTodosFromLocalStorage = (): Todo[] => {
+  const todos = localStorage.getItem('todos');
+
+  return todos ? JSON.parse(todos) : [];
+};
+
+const initialTodos: Todo[] = getTodosFromLocalStorage();
+
+const initialState: State = {
+  todos: initialTodos,
+  newTodoTitle: '',
+  status: TodoStatus.all,
+  filter: FilterTodos.All,
+};
+
+type Action =
+  | { type: 'addTodo'; payload: Todo }
+  | { type: 'deleteTodo'; payload: number }
+  | { type: 'updateTodo'; payload: Todo }
+  | { type: 'setNewTodoTitle'; payload: string }
+  | { type: 'setAllCompleted'; payload: boolean }
+  | { type: 'setStatus'; payload: TodoStatus }
+  | { type: 'setNewStatus'; payload: Todo }
+  | { type: 'setFilterByStatus'; payload: FilterTodos }
+  | { type: 'clearAllCompleted' };
+
+function reducer(state: State, action: Action): State {
+  switch (action.type) {
+    case 'addTodo':
+      return {
+        ...state,
+        todos: [...state.todos, action.payload],
+      };
+    case 'deleteTodo':
+      return {
+        ...state,
+        todos: state.todos.filter(todo => todo.id !== action.payload),
+      };
+    case 'updateTodo':
+      return {
+        ...state,
+        todos: state.todos.map(todo =>
+          todo.id === action.payload.id
+            ? { ...todo, title: action.payload.title }
+            : todo,
+        ),
+      };
+    case 'setNewTodoTitle':
+      return {
+        ...state,
+        newTodoTitle: action.payload,
+      };
+    case 'setAllCompleted':
+      return {
+        ...state,
+        todos: state.todos.map(todo => ({
+          ...todo,
+          completed: action.payload,
+        })),
+      };
+    case 'setStatus':
+      return {
+        ...state,
+        status: action.payload,
+      };
+    case 'setNewStatus':
+      return {
+        ...state,
+        todos: state.todos.map(todo =>
+          todo.id === action.payload.id
+            ? { ...todo, completed: !todo.completed }
+            : todo,
+        ),
+      };
+    case 'setFilterByStatus':
+      return {
+        ...state,
+        filter: action.payload,
+      };
+    case 'clearAllCompleted':
+      return {
+        ...state,
+        todos: state.todos.filter(todo => !todo.completed),
+      };
+    default:
+      return state;
+  }
+}
+
+export const StateContext = React.createContext<State>(initialState);
+export const DispatchContext = React.createContext<React.Dispatch<Action>>(
+  () => {},
+);
+
+type Props = {
+  children: React.ReactNode;
+};
+
+export const GlobalStateProvider: React.FC<Props> = ({ children }) => {
+  const [state, dispatch] = useReducer(reducer, initialState);
+
+  useEffect(() => {
+    localStorage.setItem('todos', JSON.stringify(state.todos));
+  }, [state.todos]);
+
+  return (
+    <DispatchContext.Provider value={dispatch}>
+      <StateContext.Provider value={state}>{children}</StateContext.Provider>
+    </DispatchContext.Provider>
+  );
+};
diff --git a/src/components/TodoItem.tsx b/src/components/TodoItem.tsx
new file mode 100644
index 000000000..019dda54f
--- /dev/null
+++ b/src/components/TodoItem.tsx
@@ -0,0 +1,143 @@
+/* eslint-disable jsx-a11y/label-has-associated-control */
+import classNames from 'classnames';
+import React, { useContext, useEffect, useRef, useState } from 'react';
+import { Todo } from '../types/Todo';
+import { DispatchContext } from './Store';
+
+type Props = {
+  todo: Todo;
+};
+
+export const TodoItem: React.FC<Props> = ({ todo }) => {
+  const dispatch = useContext(DispatchContext);
+
+  const handleChangeStatusTodo = (
+    event: React.ChangeEvent<HTMLInputElement>,
+  ) => {
+    dispatch({
+      type: 'setNewStatus',
+      payload: { ...todo, completed: event.target.checked },
+    });
+  };
+
+  const [isEditingTodo, setIsEditingTodo] = useState(false);
+  const [updatedTitleTodo, setUpdatedTitleTodo] = useState(todo.title);
+
+  const updatedInput = useRef<HTMLInputElement>(null);
+
+  useEffect(() => {
+    if (isEditingTodo && updatedInput.current) {
+      updatedInput.current?.focus();
+    }
+  }, [isEditingTodo]);
+
+  useEffect(() => setIsEditingTodo(false), [todo]);
+
+  const { id, title, completed } = todo;
+
+  const handleDeleteTodo = (todoId: number) => {
+    dispatch({ type: 'deleteTodo', payload: todoId });
+  };
+
+  const handleSubmit = () => {
+    const correctTitle = updatedTitleTodo.trim();
+
+    if (correctTitle === title) {
+      setIsEditingTodo(false);
+
+      return;
+    }
+
+    if (!correctTitle) {
+      dispatch({ type: 'deleteTodo', payload: todo.id });
+
+      return;
+    }
+
+    setUpdatedTitleTodo(correctTitle);
+
+    dispatch({ type: 'updateTodo', payload: { ...todo, title: correctTitle } });
+  };
+
+  const handleBlur = () => {
+    handleSubmit();
+  };
+
+  const handleKeyEvent = (event: React.KeyboardEvent<HTMLInputElement>) => {
+    if (event.key === 'Escape') {
+      setUpdatedTitleTodo(todo.title);
+      setIsEditingTodo(false);
+    }
+  };
+
+  const handleChange = (event: React.ChangeEvent<HTMLInputElement>) => {
+    setUpdatedTitleTodo(event.target.value);
+  };
+
+  const handleDoubleClick = () => {
+    if (!isEditingTodo) {
+      setIsEditingTodo(true);
+    }
+  };
+
+  return (
+    <div
+      key={id}
+      data-cy="Todo"
+      className={classNames('todo', { completed: completed })}
+    >
+      <label className="todo__status-label" htmlFor={`todo-status-${id}`}>
+        <input
+          id={`todo-status-${id}`}
+          data-cy="TodoStatus"
+          type="checkbox"
+          className="todo__status"
+          checked={completed}
+          onChange={handleChangeStatusTodo}
+        />
+      </label>
+
+      {isEditingTodo ? (
+        <form
+          onSubmit={(event: React.FormEvent) => {
+            event.preventDefault();
+            handleSubmit();
+            setIsEditingTodo(false);
+          }}
+        >
+          <input
+            autoFocus
+            data-cy="TodoTitleField"
+            type="text"
+            className="todo__title-field"
+            placeholder="Empty todo will be deleted"
+            value={updatedTitleTodo}
+            ref={updatedInput}
+            onChange={handleChange}
+            onBlur={handleBlur}
+            onKeyDown={handleKeyEvent}
+          />
+        </form>
+      ) : (
+        <>
+          <span
+            data-cy="TodoTitle"
+            className="todo__title"
+            onDoubleClick={handleDoubleClick}
+          >
+            {updatedTitleTodo}
+          </span>
+
+          <button
+            type="button"
+            className="todo__remove"
+            data-cy="TodoDelete"
+            onClick={() => handleDeleteTodo(id)}
+          >
+            ×
+          </button>
+        </>
+      )}
+    </div>
+  );
+};
diff --git a/src/components/TodoList.tsx b/src/components/TodoList.tsx
new file mode 100644
index 000000000..1931c60cc
--- /dev/null
+++ b/src/components/TodoList.tsx
@@ -0,0 +1,28 @@
+import { useContext, useMemo } from 'react';
+import { TodoItem } from './TodoItem';
+import { StateContext } from './Store';
+import { FilterTodos } from '../types/FilterTodos';
+
+export const TodoList = () => {
+  const { todos, filter } = useContext(StateContext);
+
+  const preparedTodos = useMemo(() => {
+    if (filter === FilterTodos.Active) {
+      return todos.filter(todo => !todo.completed);
+    }
+
+    if (filter === FilterTodos.Completed) {
+      return todos.filter(todo => todo.completed);
+    }
+
+    return todos;
+  }, [todos, filter]);
+
+  return (
+    <section className="todoapp__main" data-cy="TodoList">
+      {preparedTodos.map(todo => (
+        <TodoItem key={todo.id} todo={todo} />
+      ))}
+    </section>
+  );
+};
diff --git a/src/index.tsx b/src/index.tsx
index a9689cb38..d06ee7fb2 100644
--- a/src/index.tsx
+++ b/src/index.tsx
@@ -1,11 +1,14 @@
 import { createRoot } from 'react-dom/client';
 
-import './styles/index.css';
-import './styles/todo-list.css';
-import './styles/filters.css';
+import './styles/index.scss';
 
 import { App } from './App';
+import { GlobalStateProvider } from './components/Store';
 
 const container = document.getElementById('root') as HTMLDivElement;
 
-createRoot(container).render(<App />);
+createRoot(container).render(
+  <GlobalStateProvider>
+    <App />
+  </GlobalStateProvider>,
+);
diff --git a/src/services.ts b/src/services.ts
new file mode 100644
index 000000000..72f8cfdfe
--- /dev/null
+++ b/src/services.ts
@@ -0,0 +1,9 @@
+import { Todo } from './types/Todo';
+
+export const getActiveTodosArray = (todos: Todo[]) => {
+  return todos.filter((todo: Todo) => !todo.completed);
+};
+
+export const getCompletedTodosArray = (todos: Todo[]) => {
+  return todos.filter((todo: Todo) => todo.completed);
+};
diff --git a/src/styles/index.scss b/src/styles/index.scss
index a34eec7c6..72904c4f1 100644
--- a/src/styles/index.scss
+++ b/src/styles/index.scss
@@ -1,3 +1,7 @@
+* {
+  box-sizing: border-box;
+}
+
 iframe {
   display: none;
 }
diff --git a/src/styles/todoapp.scss b/src/styles/todoapp.scss
index e289a9458..cf79aa03b 100644
--- a/src/styles/todoapp.scss
+++ b/src/styles/todoapp.scss
@@ -58,6 +58,7 @@
   &__new-todo {
     width: 100%;
     padding: 16px 16px 16px 60px;
+    box-sizing: border-box;
 
     font-size: 24px;
     line-height: 1.4em;
diff --git a/src/types/FilterTodos.ts b/src/types/FilterTodos.ts
new file mode 100644
index 000000000..59797b251
--- /dev/null
+++ b/src/types/FilterTodos.ts
@@ -0,0 +1,5 @@
+export enum FilterTodos {
+  All = 'All',
+  Active = 'Active',
+  Completed = 'Completed',
+}
diff --git a/src/types/Todo.ts b/src/types/Todo.ts
new file mode 100644
index 000000000..d94ea1bff
--- /dev/null
+++ b/src/types/Todo.ts
@@ -0,0 +1,5 @@
+export type Todo = {
+  id: number;
+  title: string;
+  completed: boolean;
+};
diff --git a/src/types/TodoStatus.ts b/src/types/TodoStatus.ts
new file mode 100644
index 000000000..bc1b08497
--- /dev/null
+++ b/src/types/TodoStatus.ts
@@ -0,0 +1,5 @@
+export enum TodoStatus {
+  all = 'All',
+  active = 'Active',
+  completed = 'Completed',
+}