public function actionUser()
    {
        while (true) {
            $email = $this->prompt('User E-Mail:');
            if (!empty(User::findByEmail($email))) {
                $this->outputError('The provided E-Mail already exists in the System.');
            } else {
                break;
            }
        }

        $titleArray = ['Mr' => 1, 'Mrs' => 2];
        $title = $this->select('Title:', $titleArray);

        $firstname = $this->prompt('Firstname:');
        $lastname = $this->prompt('Lastname:');
        $password = $this->prompt('User Password:');

        if ($this->confirm("Are you sure to create the User '$email'?") !== true) {
            return $this->outputError('Abort user creation process.');
        }

        $user = new User();
        $user->email = $email;
        $user->password_salt = Yii::$app->getSecurity()->generateRandomString();
        $user->password = Yii::$app->getSecurity()->generatePasswordHash($password.$user->password_salt);
        $user->firstname = $firstname;
        $user->lastname = $lastname;
        $user->title = $titleArray[$title];
        if (!$user->save()) {
            return $this->outputError('User validation error: ' . VarDumper::dumpAsString($user->getErrors()));
        }

        $groupSelect = [];

        foreach (Group::find()->all() as $entry) {
            $groupSelect[$entry->id] = $entry->name.' ('.$entry->text.')';
            $this->output($entry->id.' - '.$groupSelect[$entry->id]);
        }
        $groupId = $this->select('Select Group the user should belong to:', $groupSelect);

        $this->insert('{{%admin_user_group}}', [
            'user_id' => $user->id,
            'group_id' => $groupId,
        ]);

        return $this->outputSuccess("The user ($email) has been created.");
    }