implementation

src/App.tsx

@@ -1,61 +1,129 @@
 import './App.scss';
 
-// import usersFromServer from './api/users';
-// import todosFromServer from './api/todos';
+import { useState } from 'react';
+import usersFromServer from './api/users';
+import todosFromServer from './api/todos';
+import { TodoList } from './components/TodoList';
+import { User } from './types/user';
+import { findUserById } from './services/findUserById';
+import { getNextTodoId } from './services/getNextTodoId';
+import { Todo } from './types/todo';
+
+interface FormFileds {
+  title: string;
+  user: User | undefined;
+}
 
 export const App = () => {
+  const [titleError, setEmptyTitleFieldError] = useState(false);
+  const [userError, setEmptyUserFieldError] = useState(false);
+
+  const [todosList, setTodosList] = useState<Todo[]>(todosFromServer);
+
+  const [formData, setFormData]
+    = useState<FormFileds>({ title: '', user: undefined });
+
+  const handleFormSubmit = (event: React.FormEvent<HTMLFormElement>) => {
+    event.preventDefault();
+
+    setEmptyTitleFieldError(!formData.title.trim());
+    setEmptyUserFieldError(!formData.user);
+
+    if (!formData.title.trim() || !formData.user) {
+      return;
+    }
+
+    setTodosList(prevTodos => [...prevTodos, {
+      id: getNextTodoId(todosList),
+      title: formData.title.trim(),
+      completed: false,
+      userId: formData.user ? formData.user.id : 0,
+    }]);
+
+    const form = event.target as HTMLFormElement;
+
+    form.reset();
+
+    setFormData(({ title: '', user: undefined }));
+  };
+
+  const keyCheck = (event: React.KeyboardEvent) => {
+    if (!/^[A-Za-zА-Яа-яЁёіїєґҐґ ]*$/
+      .test(event.key)) {
+      event.preventDefault();
+    }
+  };
+
+  const handleUserChange = (event: React.ChangeEvent<HTMLSelectElement>) => {
+    const user = findUserById(+event.currentTarget.value);
+
+    setFormData({
+      title: formData.title,
+      user: user || undefined,
+    });
+
+    setEmptyUserFieldError(false);
+  };
+
+  const handleTitleChange = (event: React.FormEvent<HTMLInputElement>) => {
+    setFormData({
+      ...formData,
+      title: event.currentTarget.value,
+    });
+
+    setEmptyTitleFieldError(false);
+  };
+
   return (
     <div className="App">
       <h1>Add todo form</h1>
 
-      <form action="/api/todos" method="POST">
+      <form
+        action="/api/todos"
+        method="POST"
+        onSubmit={handleFormSubmit}
+      >
         <div className="field">
-          <input type="text" data-cy="titleInput" />
-          <span className="error">Please enter a title</span>
+          <label htmlFor="title">Title: </label>
+          <input
+            placeholder="Enter a title"
+            id="title"
+            onInput={event => handleTitleChange(event)}
+            type="text"
+            data-cy="titleInput"
+            onKeyDown={keyCheck}
+          />
+          {titleError
+            && (<span className="error">Please enter a title</span>)}
         </div>
 
         <div className="field">
-          <select data-cy="userSelect">
+          <label htmlFor="user">User: </label>
+          <select
+            id="user"
+            data-cy="userSelect"
+            defaultValue={0}
+            onChange={handleUserChange}
+          >
             <option value="0" disabled>Choose a user</option>
+            {usersFromServer.map(user => (
+              <option
+                value={user.id}
+                key={user.id}
+              >
+                {user.name}
+              </option>
+            ))}
           </select>
-
-          <span className="error">Please choose a user</span>
+          {userError
+            && (<span className="error">Please choose a user</span>)}
         </div>
 
         <button type="submit" data-cy="submitButton">
           Add
         </button>
       </form>
-
-      <section className="TodoList">
-        <article data-id="1" className="TodoInfo TodoInfo--completed">
-          <h2 className="TodoInfo__title">
-            delectus aut autem
-          </h2>
-
-          <a className="UserInfo" href="mailto:Sincere@april.biz">
-            Leanne Graham
-          </a>
-        </article>
-
-        <article data-id="15" className="TodoInfo TodoInfo--completed">
-          <h2 className="TodoInfo__title">delectus aut autem</h2>
-
-          <a className="UserInfo" href="mailto:Sincere@april.biz">
-            Leanne Graham
-          </a>
-        </article>
-
-        <article data-id="2" className="TodoInfo">
-          <h2 className="TodoInfo__title">
-            quis ut nam facilis et officia qui
-          </h2>
-
-          <a className="UserInfo" href="mailto:Julianne.OConner@kory.org">
-            Patricia Lebsack
-          </a>
-        </article>
-      </section>
+      <TodoList todos={todosList} />
     </div>
   );
 };

src/components/TodoInfo/TodoInfo.tsx

@@ -1 +1,26 @@
-export const TodoInfo = () => {};
+import classNames from 'classnames';
+import { findUserById } from '../../services/findUserById';
+import { Todo } from '../../types/todo';
+import { UserInfo } from '../UserInfo';
+
+type Props = {
+  todo: Todo;
+};
+
+export const TodoInfo: React.FC<Props> = ({ todo }) => {
+  const user = findUserById(todo.userId);
+
+  return (
+    <article
+      data-id={todo.id}
+      className={classNames('TodoInfo', {
+        'TodoInfo--completed': todo.completed,
+      })}
+    >
+      <h2 className="TodoInfo__title">
+        {todo.title}
+      </h2>
+      {todo.userId !== 0 && user && (<UserInfo user={user} />)}
+    </article>
+  );
+};

src/components/TodoList/TodoList.tsx

@@ -1 +1,19 @@
-export const TodoList = () => {};
+import { Todo } from '../../types/todo';
+import { TodoInfo } from '../TodoInfo';
+
+type Props = {
+  todos: Todo[]
+};
+
+export const TodoList: React.FC<Props> = ({ todos }) => {
+  return (
+    <section className="TodoList">
+      {todos.map(todo => (
+        <TodoInfo
+          todo={todo}
+          key={todo.id}
+        />
+      ))}
+    </section>
+  );
+};

src/components/UserInfo/UserInfo.tsx

@@ -1 +1,13 @@
-export const UserInfo = () => {};
+import { User } from '../../types/user';
+
+type Props = {
+  user: User
+};
+
+export const UserInfo: React.FC<Props> = ({ user }) => {
+  return (
+    <a className="UserInfo" href={`mailto:${user.email}`}>
+      {user.name}
+    </a>
+  );
+};

src/services/findUserById.ts

@@ -0,0 +1,6 @@
+import usersFromServer from '../api/users';
+import { User } from '../types/user';
+
+export const findUserById = (id: number): User | null => {
+  return usersFromServer.find(user => user.id === id) || null;
+};

src/services/getNextTodoId.ts

@@ -0,0 +1,5 @@
+import { Todo } from '../types/todo';
+
+export const getNextTodoId = (todos: Todo[]) => {
+  return Math.max(...todos.map(todo => todo.id)) + 1;
+};

src/types/todo.ts

@@ -0,0 +1,6 @@
+export type Todo = {
+  id: number,
+  title: string,
+  completed: boolean,
+  userId: number,
+};

src/types/user.ts

@@ -0,0 +1,6 @@
+export type User = {
+  id: number,
+  name: string,
+  username: string,
+  email: string,
+};