class ConditionDelete

abstract class ConditionDelete extends ConfirmFormBase {
  
  /**
   * @var \Drupal\Core\TempStore\SharedTempStoreFactory
   */
  protected $tempstore;
  
  /**
   * @var \Drupal\Core\Condition\ConditionManager
   */
  protected $manager;
  
  /**
   * @var string
   */
  protected $tempstore_id;
  
  /**
   * @var string
   */
  protected $machine_name;
  
  /**
   * @var int
   */
  protected $id;
  
  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container) {
    return new static($container->get('tempstore.shared'), $container->get('plugin.manager.condition'));
  }
  
  /**
   * Condition Delete Confirmation Form Constructor.
   *
   * @param \Drupal\Core\TempStore\SharedTempStoreFactory $tempstore
   *   The Tempstore Factory.
   * @param \Drupal\Component\Plugin\PluginManagerInterface $manager
   *   The Plugin Manager.
   */
  public function __construct(SharedTempStoreFactory $tempstore, PluginManagerInterface $manager) {
    $this->tempstore = $tempstore;
    $this->manager = $manager;
  }
  
  /**
   * {@inheritdoc}
   */
  public function getFormId() {
    return 'ctools_condition_delete';
  }
  
  /**
   * {@inheritdoc}
   */
  public function buildForm(array $form, FormStateInterface $form_state, $id = NULL, $tempstore_id = NULL, $machine_name = NULL) {
    $this->tempstore_id = $tempstore_id;
    $this->machine_name = $machine_name;
    $this->id = $id;
    $cached_values = $this->tempstore
      ->get($this->tempstore_id)
      ->get($this->machine_name);
    $form['#title'] = $this->getQuestion($id, $cached_values);
    $form['#attributes']['class'][] = 'confirmation';
    $form['description'] = [
      '#markup' => $this->getDescription(),
    ];
    $form[$this->getFormName()] = [
      '#type' => 'hidden',
      '#value' => 1,
    ];
    // By default, render the form using theme_confirm_form().
    if (!isset($form['#theme'])) {
      $form['#theme'] = 'confirm_form';
    }
    $form['actions'] = [
      '#type' => 'actions',
    ];
    $form['actions'] += $this->actions($form, $form_state);
    return $form;
  }
  
  /**
   * {@inheritdoc}
   */
  public function submitForm(array &$form, FormStateInterface $form_state) {
    $cached_values = $this->tempstore
      ->get($this->tempstore_id)
      ->get($this->machine_name);
    $conditions = $this->getConditions($cached_values);
    /** @var  \Drupal\ctools\ConstraintConditionInterface $instance */
    $instance = $this->manager
      ->createInstance($conditions[$this->id]['id'], $conditions[$this->id]);
    if ($instance instanceof ConstraintConditionInterface) {
      $instance->removeConstraints($this->getContexts($cached_values));
    }
    unset($conditions[$this->id]);
    $cached_values = $this->setConditions($cached_values, $conditions);
    $this->tempstore
      ->get($this->tempstore_id)
      ->set($this->machine_name, $cached_values);
    [$route_name, $route_parameters] = $this->getParentRouteInfo($cached_values);
    $form_state->setRedirect($route_name, $route_parameters);
  }
  
  /**
   * Gets the delete question.
   *
   * @param $id
   *   Condition ID.
   * @param $cached_values
   *   Cached Context values.
   *
   * @return \Drupal\Core\StringTranslation\TranslatableMarkup
   *   The confirmation delete question.
   */
  public function getQuestion($id = NULL, $cached_values = NULL) {
    $condition = $this->getConditions($cached_values)[$id];
    return $this->t('Are you sure you want to delete the @label condition?', [
      '@label' => $condition['id'],
    ]);
  }
  
  /**
   * {@inheritdoc}
   */
  public function getDescription() {
    return $this->t('This action cannot be undone.');
  }
  
  /**
   * {@inheritdoc}
   */
  public function getFormName() {
    return 'confirm';
  }
  
  /**
   * {@inheritdoc}
   */
  protected function actions(array $form, FormStateInterface $form_state) {
    return [
      'submit' => [
        '#type' => 'submit',
        '#value' => $this->getConfirmText(),
        '#validate' => [
          [
            $this,
            'validateForm',
          ],
        ],
        '#submit' => [
          [
            $this,
            'submitForm',
          ],
        ],
      ],
      'cancel' => ConfirmFormHelper::buildCancelLink($this, $this->getRequest()),
    ];
  }
  
  /**
   * Returns the route to go to if the user cancels the action.
   *
   * @return \Drupal\Core\Url
   *   A URL object.
   */
  public function getCancelUrl() {
    $cached_values = $this->tempstore
      ->get($this->tempstore_id)
      ->get($this->machine_name);
    [$route_name, $route_parameters] = $this->getParentRouteInfo($cached_values);
    return new Url($route_name, $route_parameters);
  }
  
  /**
   * {@inheritdoc}
   */
  public function getConfirmText() {
    return $this->t('Delete');
  }
  
  /**
   * {@inheritdoc}
   */
  public function getCancelText() {
    return $this->t('Cancel');
  }
  
  /**
   * Document the route name and parameters for redirect after submission.
   *
   * @param array $cached_values
   *   The cached context values.
   *
   * @return array
   *   In the format of
   *   return ['route.name', ['machine_name' => $this->machine_name, 'step' => 'step_name]];
   */
  abstract protected function getParentRouteInfo(array $cached_values);
  
  /**
   * Custom logic for retrieving the conditions array from cached_values.
   *
   * @param array $cached_values
   *   The cached context values.
   *
   * @return array
   *   The conditions.
   */
  abstract protected function getConditions(array $cached_values);
  
  /**
   * Custom logic for setting the conditions array in cached_values.
   *
   * @param array $cached_values
   *   The cached context values.
   * @param mixed $conditions
   *   The conditions to set within the cached values.
   *
   * @return mixed
   *   Return the $cached_values
   */
  abstract protected function setConditions(array $cached_values, mixed $conditions);
  
  /**
   * Custom logic for retrieving the contexts array from cached_values.
   *
   * @param array $cached_values
   *   The cached context values.
   *
   * @return \Drupal\Core\Plugin\Context\ContextInterface[]
   */
  abstract protected function getContexts(array $cached_values);

}