// subscribe
	$app->get('/subscribe', function ($request, $response, $args) {
		$args['title'] = 'Subscribe';

		if($this->session->get('logged_in')) {
			$args['title'] = 'Already Logged In';

			return $this->twig->render($response, 'already_logged_in.html', $args);
		}

		return $this->twig->render($response, 'subscribe.html', $args);
	})->setName('subscribe');

	// subscribe
	$app->post('/subscribe', function ($request, $response, $args) {
		$args['title'] = 'Subscribe';

		if($this->session->get('logged_in')) {
			$args['title'] = 'Already Logged In';

			return $this->twig->render($response, 'already_logged_in.html', $args);
		}

		$post = $request->getParams();

		$username = trim($post['username']);
		if(!ctype_alnum($username) || !(strlen($username) >= 4) || empty($username)) {
			$args['error']['username'] = "The username must be alphanumeric and be at least 4 characters long.";
		}

		$query = $this->database->prepare('SELECT COUNT(*) FROM `user` WHERE `username` = ?;');
		$query->execute([$username]);


		if($query->fetchColumn() > 0 ) {
			$args['error']['username'] = "This username already exists.";
		}

		$password = trim($post['password']);
		if(!ctype_alnum($password) && !(strlen($password) >= 4) && empty($password)) {
			$args['error']['password'] = "The password must be alphanumeric and be at least 4 characters long.";
		}


		$email = trim($post['email']);
		if(filter_var($email, FILTER_VALIDATE_EMAIL) === false)  {
			$args['error']['email'] = "The email must be a valid email address";
		}

		$query = $this->database->prepare('SELECT COUNT(*) FROM `user` WHERE `email` = ?;');
		$query->execute([$email]);


		if($query->fetchColumn() > 0 ) {
			$args['error']['email'] = "This email is already being used.";
		}


		if(!empty($args['error'])) {
			return $this->twig->render($response, 'subscribe.html', $args);
		}


		$query = $this->database->prepare('INSERT INTO `user` (`username`, `password`, `email`) VALUES (?, ?, ?);');
		$query->execute(array(ucfirst($username), $password, $email));

		return $this->twig->render($response, 'subscribe-success.html', $args);
	})->setName('subscribe');