protected function execute(InputInterface $input, OutputInterface $output)
    {
        $userService = new UserService($this->userStore);

        /** @var $dialog \Symfony\Component\Console\Helper\DialogHelper */
        $dialog = $this->getHelperSet()->get('dialog');

        // Function to validate mail address.
        $mailValidator = function ($answer) {
            if (!filter_var($answer, FILTER_VALIDATE_EMAIL)) {
                throw new \InvalidArgumentException(Lang::get('must_be_valid_email'));
            }

            return $answer;
        };

        $adminEmail = $dialog->askAndValidate($output, Lang::get('enter_email'), $mailValidator, false);
        $adminName = $dialog->ask($output, Lang::get('enter_name'));
        $adminPass = $dialog->askHiddenResponse($output, Lang::get('enter_password'));

        try {
            $userService->createUser($adminName, $adminEmail, $adminPass, true);
            $output->writeln(Lang::get('user_created'));
        } catch (\Exception $e) {
            $output->writeln(sprintf('<error>%s</error>', Lang::get('failed_to_create')));
            $output->writeln(sprintf('<error>%s</error>', $e->getMessage()));
        }
    }