class MediaDeleteMultipleConfirmForm

class MediaDeleteMultipleConfirmForm extends ConfirmFormBase {
    
    /**
     * The array of media items to delete, indexed by ID and language.
     *
     * @var string[][]
     */
    protected $mediaItems = [];
    
    /**
     * The tempstore factory.
     *
     * @var \Drupal\Core\TempStore\PrivateTempStoreFactory
     */
    protected $tempStoreFactory;
    
    /**
     * The entity storage.
     *
     * @var \Drupal\Core\Entity\EntityStorageInterface
     */
    protected $storage;
    
    /**
     * Constructs a MediaDeleteMultipleConfirmForm form object.
     *
     * @param \Drupal\Core\TempStore\PrivateTempStoreFactory $temp_store_factory
     *   The tempstore factory.
     * @param \Drupal\Core\Entity\EntityTypeManagerInterface $manager
     *   The entity type manager.
     */
    public function __construct(PrivateTempStoreFactory $temp_store_factory, EntityTypeManagerInterface $manager) {
        @trigger_error(__CLASS__ . ' is deprecated in Drupal 8.6.0 and will be removed before Drupal 9.0.0. It is not used in Drupal core. As an internal API, it may also be removed in a minor release. If you are using it, copy the class and the related "entity.media.multiple_delete_confirm" route to your module.', E_USER_DEPRECATED);
        $this->tempStoreFactory = $temp_store_factory;
        $this->storage = $manager->getStorage('media');
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container) {
        return new static($container->get('tempstore.private'), $container->get('entity_type.manager'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function getFormId() {
        return 'media_multiple_delete_confirm';
    }
    
    /**
     * {@inheritdoc}
     */
    public function getQuestion() {
        return $this->formatPlural(count($this->mediaItems), 'Are you sure you want to delete this item?', 'Are you sure you want to delete these items?');
    }
    
    /**
     * {@inheritdoc}
     */
    public function getCancelUrl() {
        // @todo Change to media library when #2834729 is done.
        // https://www.drupal.org/node/2834729.
        return new Url('system.admin_content');
    }
    
    /**
     * {@inheritdoc}
     */
    public function getConfirmText() {
        return $this->t('Delete');
    }
    
    /**
     * {@inheritdoc}
     *
     * @todo Change to trait or base class when #2843395 is done.
     * @see https://www.drupal.org/node/2843395
     */
    public function buildForm(array $form, FormStateInterface $form_state) {
        $this->mediaItems = $this->tempStoreFactory
            ->get('media_multiple_delete_confirm')
            ->get($this->currentUser()
            ->id());
        if (empty($this->mediaItems)) {
            return new RedirectResponse($this->getCancelUrl()
                ->setAbsolute()
                ->toString());
        }
        
        /** @var \Drupal\media\MediaInterface[] $entities */
        $entities = $this->storage
            ->loadMultiple(array_keys($this->mediaItems));
        $items = [];
        foreach ($this->mediaItems as $id => $langcodes) {
            foreach ($langcodes as $langcode) {
                $entity = $entities[$id]->getTranslation($langcode);
                $key = $id . ':' . $langcode;
                $default_key = $id . ':' . $entity->getUntranslated()
                    ->language()
                    ->getId();
                // If we have a translated entity we build a nested list of translations
                // that will be deleted.
                $languages = $entity->getTranslationLanguages();
                if (count($languages) > 1 && $entity->isDefaultTranslation()) {
                    $names = [];
                    foreach ($languages as $translation_langcode => $language) {
                        $names[] = $language->getName();
                        unset($items[$id . ':' . $translation_langcode]);
                    }
                    $items[$default_key] = [
                        'label' => [
                            '#markup' => $this->t('@label (Original translation) - <em>The following translations will be deleted:</em>', [
                                '@label' => $entity->label(),
                            ]),
                        ],
                        'deleted_translations' => [
                            '#theme' => 'item_list',
                            '#items' => $names,
                        ],
                    ];
                }
                elseif (!isset($items[$default_key])) {
                    $items[$key] = $entity->label();
                }
            }
        }
        $form['entities'] = [
            '#theme' => 'item_list',
            '#items' => $items,
        ];
        return parent::buildForm($form, $form_state);
    }
    
    /**
     * {@inheritdoc}
     *
     * @todo Change to trait or base class when #2843395 is done.
     * @see https://www.drupal.org/node/2843395
     */
    public function submitForm(array &$form, FormStateInterface $form_state) {
        if ($form_state->getValue('confirm') && !empty($this->mediaItems)) {
            $total_count = 0;
            $delete_entities = [];
            
            /** @var \Drupal\Core\Entity\ContentEntityInterface[][] $delete_translations */
            $delete_translations = [];
            
            /** @var \Drupal\media\MediaInterface[] $entities */
            $entities = $this->storage
                ->loadMultiple(array_keys($this->mediaItems));
            foreach ($this->mediaItems as $id => $langcodes) {
                foreach ($langcodes as $langcode) {
                    $entity = $entities[$id]->getTranslation($langcode);
                    if ($entity->isDefaultTranslation()) {
                        $delete_entities[$id] = $entity;
                        unset($delete_translations[$id]);
                        $total_count += count($entity->getTranslationLanguages());
                    }
                    elseif (!isset($delete_entities[$id])) {
                        $delete_translations[$id][] = $entity;
                    }
                }
            }
            if ($delete_entities) {
                $this->storage
                    ->delete($delete_entities);
                $this->logger('media')
                    ->notice('Deleted @count media items.', [
                    '@count' => count($delete_entities),
                ]);
            }
            if ($delete_translations) {
                $count = 0;
                foreach ($delete_translations as $id => $translations) {
                    $entity = $entities[$id]->getUntranslated();
                    foreach ($translations as $translation) {
                        $entity->removeTranslation($translation->language()
                            ->getId());
                    }
                    $entity->save();
                    $count += count($translations);
                }
                if ($count) {
                    $total_count += $count;
                    $this->logger('media')
                        ->notice('Deleted @count media translations.', [
                        '@count' => $count,
                    ]);
                }
            }
            if ($total_count) {
                $this->messenger()
                    ->addStatus($this->formatPlural($total_count, 'Deleted 1 media item.', 'Deleted @count media items.'));
            }
            $this->tempStoreFactory
                ->get('media_multiple_delete_confirm')
                ->delete(\Drupal::currentUser()->id());
        }
        // @todo Change to media library when #2834729 is done.
        // https://www.drupal.org/node/2834729.
        $form_state->setRedirect('system.admin_content');
    }

}