class OEmbedFormatter

class OEmbedFormatter extends FormatterBase {
    
    /**
     * The messenger service.
     *
     * @var \Drupal\Core\Messenger\MessengerInterface
     */
    protected $messenger;
    
    /**
     * The oEmbed resource fetcher.
     *
     * @var \Drupal\media\OEmbed\ResourceFetcherInterface
     */
    protected $resourceFetcher;
    
    /**
     * The oEmbed URL resolver service.
     *
     * @var \Drupal\media\OEmbed\UrlResolverInterface
     */
    protected $urlResolver;
    
    /**
     * The logger service.
     *
     * @var \Psr\Log\LoggerInterface
     */
    protected $logger;
    
    /**
     * The media settings config.
     *
     * @var \Drupal\Core\Config\ImmutableConfig
     */
    protected $config;
    
    /**
     * The iFrame URL helper service.
     *
     * @var \Drupal\media\IFrameUrlHelper
     */
    protected $iFrameUrlHelper;
    
    /**
     * Constructs an OEmbedFormatter instance.
     *
     * @param string $plugin_id
     *   The plugin ID for the formatter.
     * @param mixed $plugin_definition
     *   The plugin implementation definition.
     * @param \Drupal\Core\Field\FieldDefinitionInterface $field_definition
     *   The definition of the field to which the formatter is associated.
     * @param array $settings
     *   The formatter settings.
     * @param string $label
     *   The formatter label display setting.
     * @param string $view_mode
     *   The view mode.
     * @param array $third_party_settings
     *   Any third party settings.
     * @param \Drupal\Core\Messenger\MessengerInterface $messenger
     *   The messenger service.
     * @param \Drupal\media\OEmbed\ResourceFetcherInterface $resource_fetcher
     *   The oEmbed resource fetcher service.
     * @param \Drupal\media\OEmbed\UrlResolverInterface $url_resolver
     *   The oEmbed URL resolver service.
     * @param \Drupal\Core\Logger\LoggerChannelFactoryInterface $logger_factory
     *   The logger factory service.
     * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
     *   The config factory service.
     * @param \Drupal\media\IFrameUrlHelper $iframe_url_helper
     *   The iFrame URL helper service.
     */
    public function __construct($plugin_id, $plugin_definition, FieldDefinitionInterface $field_definition, array $settings, $label, $view_mode, array $third_party_settings, MessengerInterface $messenger, ResourceFetcherInterface $resource_fetcher, UrlResolverInterface $url_resolver, LoggerChannelFactoryInterface $logger_factory, ConfigFactoryInterface $config_factory, IFrameUrlHelper $iframe_url_helper) {
        parent::__construct($plugin_id, $plugin_definition, $field_definition, $settings, $label, $view_mode, $third_party_settings);
        $this->messenger = $messenger;
        $this->resourceFetcher = $resource_fetcher;
        $this->urlResolver = $url_resolver;
        $this->logger = $logger_factory->get('media');
        $this->config = $config_factory->get('media.settings');
        $this->iFrameUrlHelper = $iframe_url_helper;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
        return new static($plugin_id, $plugin_definition, $configuration['field_definition'], $configuration['settings'], $configuration['label'], $configuration['view_mode'], $configuration['third_party_settings'], $container->get('messenger'), $container->get('media.oembed.resource_fetcher'), $container->get('media.oembed.url_resolver'), $container->get('logger.factory'), $container->get('config.factory'), $container->get('media.oembed.iframe_url_helper'));
    }
    
    /**
     * {@inheritdoc}
     */
    public static function defaultSettings() {
        return [
            'max_width' => 0,
            'max_height' => 0,
            'loading' => [
                'attribute' => 'lazy',
            ],
        ] + parent::defaultSettings();
    }
    
    /**
     * {@inheritdoc}
     */
    public function viewElements(FieldItemListInterface $items, $langcode) {
        $element = [];
        $max_width = $this->getSetting('max_width');
        $max_height = $this->getSetting('max_height');
        foreach ($items as $delta => $item) {
            $main_property = $item->getFieldDefinition()
                ->getFieldStorageDefinition()
                ->getMainPropertyName();
            $value = $item->{$main_property};
            if (empty($value)) {
                continue;
            }
            try {
                $resource_url = $this->urlResolver
                    ->getResourceUrl($value, $max_width, $max_height);
                $resource = $this->resourceFetcher
                    ->fetchResource($resource_url);
            } catch (ResourceException $exception) {
                $this->logger
                    ->error("Could not retrieve the remote URL (@url): %error", [
                    '@url' => $value,
                    '%error' => $exception->getPrevious() ? $exception->getPrevious()
                        ->getMessage() : $exception->getMessage(),
                    'exception' => $exception,
                ]);
                continue;
            }
            if ($resource->getType() === Resource::TYPE_LINK) {
                $element[$delta] = [
                    '#title' => $resource->getTitle(),
                    '#type' => 'link',
                    '#url' => Url::fromUri($value),
                ];
            }
            elseif ($resource->getType() === Resource::TYPE_PHOTO) {
                $element[$delta] = [
                    '#theme' => 'image',
                    '#uri' => $resource->getUrl()
                        ->toString(),
                    '#width' => $resource->getWidth(),
                    '#height' => $resource->getHeight(),
                    '#attributes' => [
                        'loading' => $this->getSetting('loading')['attribute'],
                    ],
                ];
            }
            else {
                $url = Url::fromRoute('media.oembed_iframe', [], [
                    'absolute' => TRUE,
                    'query' => [
                        'url' => $value,
                        'max_width' => $max_width,
                        'max_height' => $max_height,
                        'hash' => $this->iFrameUrlHelper
                            ->getHash($value, $max_width, $max_height),
                    ],
                ]);
                $domain = $this->config
                    ->get('iframe_domain');
                if ($domain) {
                    $url->setOption('base_url', $domain);
                }
                // Render videos and rich content in an iframe for security reasons.
                // @see: https://oembed.com/#section3
                $element[$delta] = [
                    '#type' => 'html_tag',
                    '#tag' => 'iframe',
                    '#attributes' => [
                        'src' => $url->toString(),
                        'scrolling' => FALSE,
                        // External service is not supposed to send something larger
                        // than the max width or max height, so those values should be used.
'width' => $resource->getWidth() ?: $max_width,
                        'height' => $resource->getHeight() ?: $max_height,
                        'class' => [
                            'media-oembed-content',
                        ],
                        'loading' => $this->getSetting('loading')['attribute'],
                    ],
                    '#attached' => [
                        'library' => [
                            'media/oembed.formatter',
                        ],
                    ],
                ];
                // An empty title attribute will disable title inheritance, so only
                // add it if the resource has a title.
                $title = $resource->getTitle();
                if ($title) {
                    $element[$delta]['#attributes']['title'] = $title;
                }
                CacheableMetadata::createFromObject($resource)->addCacheTags($this->config
                    ->getCacheTags())
                    ->applyTo($element[$delta]);
            }
        }
        return $element;
    }
    
    /**
     * {@inheritdoc}
     */
    public function settingsForm(array $form, FormStateInterface $form_state) {
        $form = parent::settingsForm($form, $form_state) + [
            'max_width' => [
                '#type' => 'number',
                '#title' => $this->t('Maximum width'),
                '#default_value' => $this->getSetting('max_width'),
                '#size' => 5,
                '#maxlength' => 5,
                '#field_suffix' => $this->t('pixels'),
                '#min' => 0,
            ],
            'max_height' => [
                '#type' => 'number',
                '#title' => $this->t('Maximum height'),
                '#default_value' => $this->getSetting('max_height'),
                '#size' => 5,
                '#maxlength' => 5,
                '#field_suffix' => $this->t('pixels'),
                '#min' => 0,
            ],
            'loading' => [
                '#type' => 'details',
                '#title' => $this->t('oEmbed loading'),
                '#description' => $this->t('Lazy render oEmbed with native loading attribute (<em>loading="lazy"</em>). This improves performance by allowing browsers to lazily load assets.'),
                'attribute' => [
                    '#title' => $this->t('oEmbed loading attribute'),
                    '#type' => 'radios',
                    '#default_value' => $this->getSetting('loading')['attribute'],
                    '#options' => [
                        'lazy' => $this->t('Lazy (<em>loading="lazy"</em>)'),
                        'eager' => $this->t('Eager (<em>loading="eager"</em>)'),
                    ],
                    '#description' => $this->t('Select the loading attribute for oEmbed. <a href=":link">Learn more about the loading attribute for oEmbed.</a>', [
                        ':link' => 'https://html.spec.whatwg.org/multipage/urls-and-fetching.html#lazy-loading-attributes',
                    ]),
                ],
            ],
        ];
        $form['loading']['attribute']['lazy']['#description'] = $this->t('Delays loading the resource until that section of the page is visible in the browser. When in doubt, lazy loading is recommended.');
        $form['loading']['attribute']['eager']['#description'] = $this->t('Force browsers to download a resource as soon as possible. This is the browser default for legacy reasons. Only use this option when the resource is always expected to render.');
        return $form;
    }
    
    /**
     * {@inheritdoc}
     */
    public function settingsSummary() {
        $summary = parent::settingsSummary();
        if ($this->getSetting('max_width') && $this->getSetting('max_height')) {
            $summary[] = $this->t('Maximum size: %max_width x %max_height pixels', [
                '%max_width' => $this->getSetting('max_width'),
                '%max_height' => $this->getSetting('max_height'),
            ]);
        }
        elseif ($this->getSetting('max_width')) {
            $summary[] = $this->t('Maximum width: %max_width pixels', [
                '%max_width' => $this->getSetting('max_width'),
            ]);
        }
        elseif ($this->getSetting('max_height')) {
            $summary[] = $this->t('Maximum height: %max_height pixels', [
                '%max_height' => $this->getSetting('max_height'),
            ]);
        }
        $summary[] = $this->t('Loading attribute: @attribute', [
            '@attribute' => $this->getSetting('loading')['attribute'],
        ]);
        return $summary;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function isApplicable(FieldDefinitionInterface $field_definition) {
        if ($field_definition->getTargetEntityTypeId() !== 'media') {
            return FALSE;
        }
        if (parent::isApplicable($field_definition)) {
            $media_type = $field_definition->getTargetBundle();
            if ($media_type) {
                $media_type = MediaType::load($media_type);
                return $media_type && $media_type->getSource() instanceof OEmbedInterface;
            }
        }
        return FALSE;
    }

}