class VocabularyResetForm

class VocabularyResetForm extends EntityConfirmFormBase {
  
  /**
   * The term storage.
   *
   * @var \Drupal\taxonomy\TermStorageInterface
   */
  protected $termStorage;
  
  /**
   * Constructs a new VocabularyResetForm object.
   *
   * @param \Drupal\taxonomy\TermStorageInterface $term_storage
   *   The term storage.
   */
  public function __construct(TermStorageInterface $term_storage) {
    $this->termStorage = $term_storage;
  }
  
  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container) {
    return new static($container->get('entity_type.manager')
      ->getStorage('taxonomy_term'));
  }
  
  /**
   * {@inheritdoc}
   */
  public function getFormId() {
    return 'taxonomy_vocabulary_confirm_reset_alphabetical';
  }
  
  /**
   * {@inheritdoc}
   */
  public function getQuestion() {
    return $this->t('Are you sure you want to reset the vocabulary %title to alphabetical order?', [
      '%title' => $this->entity
        ->label(),
    ]);
  }
  
  /**
   * {@inheritdoc}
   */
  public function getCancelUrl() {
    return $this->entity
      ->toUrl('overview-form');
  }
  
  /**
   * {@inheritdoc}
   */
  public function getDescription() {
    return $this->t('Resetting a vocabulary will discard all custom ordering and sort items alphabetically.');
  }
  
  /**
   * {@inheritdoc}
   */
  public function getConfirmText() {
    return $this->t('Reset to alphabetical');
  }
  
  /**
   * {@inheritdoc}
   */
  public function submitForm(array &$form, FormStateInterface $form_state) {
    parent::submitForm($form, $form_state);
    $this->termStorage
      ->resetWeights($this->entity
      ->id());
    $this->messenger()
      ->addStatus($this->t('Reset vocabulary %name to alphabetical order.', [
      '%name' => $this->entity
        ->label(),
    ]));
    $this->logger('taxonomy')
      ->notice('Reset vocabulary %name to alphabetical order.', [
      '%name' => $this->entity
        ->label(),
    ]);
    $form_state->setRedirectUrl($this->getCancelUrl());
  }

}