class MediaRequirementsHooks

class MediaRequirementsHooks {
    use StringTranslationTrait;
    public function __construct(AccountInterface $currentUser, ModuleHandlerInterface $moduleHandler, EntityDisplayRepositoryInterface $entityDisplayRepository) {
    }
    
    /**
     * Implements hook_runtime_requirements().
     */
    public function runtime() : array {
        $requirements = [];
        foreach (MediaType::loadMultiple() as $type) {
            // Load the default display.
            $display = $this->entityDisplayRepository
                ->getViewDisplay('media', $type->id());
            // Check for missing source field definition.
            $source_field_definition = $type->getSource()
                ->getSourceFieldDefinition($type);
            if (empty($source_field_definition)) {
                $requirements['media_missing_source_field_' . $type->id()] = [
                    'title' => $this->t('Media'),
                    'description' => $this->t('The source field definition for the %type media type is missing.', [
                        '%type' => $type->label(),
                    ]),
                    'severity' => RequirementSeverity::Error,
                ];
                continue;
            }
            // When a new media type with an image source is created we're
            // configuring the default entity view display using the 'large' image
            // style. Unfortunately, if a site builder has deleted the 'large' image
            // style, we need some other image style to use, but at this point, we
            // can't really know the site builder's intentions. So rather than do
            // something surprising, we're leaving the embedded media without an
            // image style and adding a warning that the site builder might want to
            // add an image style.
            // @see Drupal\media\Plugin\media\Source\Image::prepareViewDisplay
            if (!is_a($source_field_definition->getItemDefinition()
                ->getClass(), ImageItem::class, TRUE)) {
                continue;
            }
            $component = $display->getComponent($source_field_definition->getName());
            if (empty($component) || $component['type'] !== 'image' || !empty($component['settings']['image_style'])) {
                continue;
            }
            $action_item = '';
            if ($this->moduleHandler
                ->moduleExists('field_ui') && $this->currentUser
                ->hasPermission('administer media display')) {
                $url = Url::fromRoute('entity.entity_view_display.media.default', [
                    'media_type' => $type->id(),
                ])
                    ->toString();
                $action_item = new TranslatableMarkup('If you would like to change this, <a href=":display">add an image style to the %field_name field</a>.', [
                    '%field_name' => $source_field_definition->label(),
                    ':display' => $url,
                ]);
            }
            $requirements['media_default_image_style_' . $type->id()] = [
                'title' => $this->t('Media'),
                'description' => new TranslatableMarkup('The default display for the %type media type is not currently using an image style on the %field_name field. Not using an image style can lead to much larger file downloads. @action_item', [
                    '%field_name' => $source_field_definition->label(),
                    '@action_item' => $action_item,
                    '%type' => $type->label(),
                ]),
                'severity' => RequirementSeverity::Warning,
            ];
        }
        return $requirements;
    }

}