class BreakLockForm

class BreakLockForm extends ConfirmFormBase {
    
    /**
     * The entity type manager.
     *
     * @var \Drupal\Core\Entity\EntityTypeManagerInterface
     */
    protected $entityTypeManager;
    
    /**
     * The rendering service.
     *
     * @var \Drupal\Core\Render\RendererInterface
     */
    protected $renderer;
    
    /**
     * The RulesUI handler of the currently active UI.
     *
     * @var \Drupal\rules\Ui\RulesUiHandlerInterface
     */
    protected $rulesUiHandler;
    
    /**
     * Constructor.
     */
    public function __construct(EntityTypeManagerInterface $entity_type_manager, RendererInterface $renderer) {
        $this->entityTypeManager = $entity_type_manager;
        $this->renderer = $renderer;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container) {
        return new static($container->get('entity_type.manager'), $container->get('renderer'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function getFormId() {
        return 'rules_break_lock_confirm';
    }
    
    /**
     * {@inheritdoc}
     */
    public function getQuestion() {
        return $this->t('Do you want to break the lock on %label?', [
            '%label' => $this->rulesUiHandler
                ->getComponentLabel(),
        ]);
    }
    
    /**
     * {@inheritdoc}
     */
    public function getDescription() {
        $locked = $this->rulesUiHandler
            ->getLockMetaData();
        $account = $this->entityTypeManager
            ->getStorage('user')
            ->load($locked->getOwnerId());
        $username = [
            '#theme' => 'username',
            '#account' => $account,
        ];
        return $this->t('By breaking this lock, any unsaved changes made by @user will be lost.', [
            '@user' => $this->renderer
                ->render($username),
        ]);
    }
    
    /**
     * {@inheritdoc}
     */
    public function getCancelUrl() {
        return $this->rulesUiHandler
            ->getBaseRouteUrl();
    }
    
    /**
     * {@inheritdoc}
     */
    public function getConfirmText() {
        return $this->t('Break lock');
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildForm(array $form, FormStateInterface $form_state, RulesUiHandlerInterface $rules_ui_handler = NULL) {
        $this->rulesUiHandler = $rules_ui_handler;
        if (!$rules_ui_handler->isLocked()) {
            $form['message']['#markup'] = $this->t('There is no lock on %label to break.', [
                '%label' => $rules_ui_handler->getComponentLabel(),
            ]);
            return $form;
        }
        return parent::buildForm($form, $form_state);
    }
    
    /**
     * {@inheritdoc}
     */
    public function submitForm(array &$form, FormStateInterface $form_state) {
        $this->rulesUiHandler
            ->clearTemporaryStorage();
        $form_state->setRedirectUrl($this->rulesUiHandler
            ->getBaseRouteUrl());
        $this->messenger()
            ->addMessage($this->t('The lock has been broken and you may now edit this @component_type.', [
            '@component_type' => $this->rulesUiHandler
                ->getPluginDefinition()->component_type_label,
        ]));
    }

}