class VocabularyFormController

class VocabularyFormController extends EntityFormController {

  /**
   * Overrides Drupal\Core\Entity\EntityFormController::form().
   */
  public function form(array $form, array &$form_state, EntityInterface $vocabulary) {

    // Check whether we need a deletion confirmation form.
    if (isset($form_state['confirm_delete']) && isset($form_state['values']['vid'])) {
      return taxonomy_vocabulary_confirm_delete($form, $form_state, $form_state['values']['vid']);
    }
    $form['name'] = array(
      '#type' => 'textfield',
      '#title' => t('Name'),
      '#default_value' => $vocabulary->name,
      '#maxlength' => 255,
      '#required' => TRUE,
    );
    $form['machine_name'] = array(
      '#type' => 'machine_name',
      '#default_value' => $vocabulary->machine_name,
      '#maxlength' => 255,
      '#machine_name' => array(
        'exists' => 'taxonomy_vocabulary_machine_name_load',
        'source' => array(
          'name',
        ),
      ),
    );
    $form['description'] = array(
      '#type' => 'textfield',
      '#title' => t('Description'),
      '#default_value' => $vocabulary->description,
    );

    // $form['langcode'] is not wrapped in an if (module_exists('language'))
    // check because the language_select form element works also without the
    // language module being installed.
    // http://drupal.org/node/1749954 documents the new element.
    $form['langcode'] = array(
      '#type' => 'language_select',
      '#title' => t('Vocabulary language'),
      '#languages' => LANGUAGE_ALL,
      '#default_value' => $vocabulary->langcode,
    );
    if (module_exists('language')) {
      $form['default_terms_language'] = array(
        '#type' => 'details',
        '#title' => t('Terms language'),
      );
      $form['default_terms_language']['default_language'] = array(
        '#type' => 'language_configuration',
        '#entity_information' => array(
          'entity_type' => 'taxonomy_term',
          'bundle' => $vocabulary->machine_name,
        ),
        '#default_value' => language_get_default_configuration('taxonomy_term', $vocabulary->machine_name),
      );
    }

    // Set the hierarchy to "multiple parents" by default. This simplifies the
    // vocabulary form and standardizes the term form.
    $form['hierarchy'] = array(
      '#type' => 'value',
      '#value' => '0',
    );
    if (isset($vocabulary->vid)) {
      $form['vid'] = array(
        '#type' => 'value',
        '#value' => $vocabulary->vid,
      );
    }
    return parent::form($form, $form_state, $vocabulary);
  }

  /**
   * Returns an array of supported actions for the current entity form.
   */
  protected function actions(array $form, array &$form_state) {

    // If we are displaying the delete confirmation skip the regular actions.
    if (empty($form_state['confirm_delete'])) {
      $actions = parent::actions($form, $form_state);
      array_unshift($actions['delete']['#submit'], array(
        $this,
        'submit',
      ));

      // Add the language configuration submit handler. This is needed because
      // the submit button has custom submit handlers.
      if (module_exists('language')) {
        array_unshift($actions['submit']['#submit'], 'language_configuration_element_submit');
        array_unshift($actions['submit']['#submit'], array(
          $this,
          'languageConfigurationSubmit',
        ));
      }

      // We cannot leverage the regular submit handler definition because we
      // have button-specific ones here. Hence we need to explicitly set it for
      // the submit action, otherwise it would be ignored.
      if (module_exists('translation_entity')) {
        array_unshift($actions['submit']['#submit'], 'translation_entity_language_configuration_element_submit');
      }
      return $actions;
    }
    else {
      return array();
    }
  }

  /**
   * Overrides Drupal\Core\Entity\EntityFormController::validate().
   */
  public function validate(array $form, array &$form_state) {
    parent::validate($form, $form_state);

    // Make sure that the machine name of the vocabulary is not in the
    // disallowed list (names that conflict with menu items, such as 'list'
    // and 'add').
    // During the deletion there is no 'machine_name' key.
    if (isset($form_state['values']['machine_name'])) {

      // Do not allow machine names to conflict with taxonomy path arguments.
      $machine_name = $form_state['values']['machine_name'];
      $disallowed = array(
        'add',
        'list',
      );
      if (in_array($machine_name, $disallowed)) {
        form_set_error('machine_name', t('The machine-readable name cannot be "add" or "list".'));
      }
    }
  }

  /**
   * Submit handler to update the bundle for the default language configuration.
   */
  public function languageConfigurationSubmit(array &$form, array &$form_state) {
    $vocabulary = $this
      ->getEntity($form_state);

    // Delete the old language settings for the vocabulary, if the machine name
    // is changed.
    if ($vocabulary && isset($vocabulary->machine_name) && $vocabulary->machine_name != $form_state['values']['machine_name']) {
      language_clear_default_configuration('taxonomy_term', $vocabulary->machine_name);
    }

    // Since the machine name is not known yet, and it can be changed anytime,
    // we have to also update the bundle property for the default language
    // configuration in order to have the correct bundle value.
    $form_state['language']['default_language']['bundle'] = $form_state['values']['machine_name'];
  }

  /**
   * Overrides Drupal\Core\Entity\EntityFormController::submit().
   */
  public function submit(array $form, array &$form_state) {

    // @todo We should not be calling taxonomy_vocabulary_confirm_delete() from
    // within the form builder.
    if ($form_state['triggering_element']['#value'] == t('Delete')) {

      // Rebuild the form to confirm vocabulary deletion.
      $form_state['rebuild'] = TRUE;
      $form_state['confirm_delete'] = TRUE;
      return NULL;
    }
    else {
      return parent::submit($form, $form_state);
    }
  }

  /**
   * Overrides Drupal\Core\Entity\EntityFormController::save().
   */
  public function save(array $form, array &$form_state) {
    $vocabulary = $this
      ->getEntity($form_state);

    // Prevent leading and trailing spaces in vocabulary names.
    $vocabulary->name = trim($vocabulary->name);
    switch (taxonomy_vocabulary_save($vocabulary)) {
      case SAVED_NEW:
        drupal_set_message(t('Created new vocabulary %name.', array(
          '%name' => $vocabulary->name,
        )));
        watchdog('taxonomy', 'Created new vocabulary %name.', array(
          '%name' => $vocabulary->name,
        ), WATCHDOG_NOTICE, l(t('edit'), 'admin/structure/taxonomy/' . $vocabulary->machine_name . '/edit'));
        $form_state['redirect'] = 'admin/structure/taxonomy/' . $vocabulary->machine_name;
        break;
      case SAVED_UPDATED:
        drupal_set_message(t('Updated vocabulary %name.', array(
          '%name' => $vocabulary->name,
        )));
        watchdog('taxonomy', 'Updated vocabulary %name.', array(
          '%name' => $vocabulary->name,
        ), WATCHDOG_NOTICE, l(t('edit'), 'admin/structure/taxonomy/' . $vocabulary->machine_name . '/edit'));
        $form_state['redirect'] = 'admin/structure/taxonomy';
        break;
    }
    $form_state['values']['vid'] = $vocabulary->vid;
    $form_state['vid'] = $vocabulary->vid;
  }

}