/**
  * Register a new user using client attributes and then associate userAuth
  *
  * @param \yii\authclient\BaseClient $client
  * @param \app\modules\user\models\UserAuth $userAuth
  */
 protected function registerAndLoginUser($client, $userAuth)
 {
     /** @var \app\modules\user\models\User    $user */
     /** @var \app\modules\user\models\Profile $profile */
     /** @var \app\modules\user\models\Role    $role */
     $role = Yii::$app->getModule("user")->model("Role");
     // set user and profile info
     $attributes = $client->getUserAttributes();
     $function = "setInfo" . ucfirst($client->name);
     // "setInfoFacebook()"
     list($user, $profile) = $this->{$function}($attributes);
     // calculate and double check username (in case it is already taken)
     $fallbackUsername = "******";
     $user = $this->doubleCheckUsername($user, $fallbackUsername);
     // save new models
     $user->setRegisterAttributes($role::ROLE_USER, Yii::$app->request->userIP, $user::STATUS_ACTIVE)->save(false);
     $profile->setUser($user->id)->save(false);
     $userAuth->setUser($user->id)->save(false);
     // log user in
     Yii::$app->user->login($user, Yii::$app->getModule("user")->loginDuration);
 }