class EntityDebugController

class EntityDebugController extends ControllerBase {
    
    /**
     * The dumper service.
     */
    protected DevelDumperManagerInterface $dumper;
    
    /**
     * The translation manager.
     */
    protected TranslationManager $translationManager;
    
    /**
     * The alias storage.
     */
    protected PathAliasStorage $aliasStorage;
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container) : static {
        $entityTypeManager = $container->get('entity_type.manager');
        $instance = parent::create($container);
        $instance->dumper = $container->get('devel.dumper');
        $instance->entityTypeManager = $entityTypeManager;
        $instance->translationManager = $container->get('string_translation');
        $instance->aliasStorage = $entityTypeManager->getStorage('path_alias');
        return $instance;
    }
    
    /**
     * Returns the entity type definition of the current entity.
     *
     * @param \Drupal\Core\Routing\RouteMatchInterface $route_match
     *   A RouteMatch object.
     *
     * @return array
     *   Array of page elements to render.
     */
    public function entityTypeDefinition(RouteMatchInterface $route_match) : array {
        $entity = $this->getEntityFromRouteMatch($route_match);
        if (!$entity instanceof EntityInterface) {
            return [];
        }
        return $this->dumper
            ->exportAsRenderable($entity->getEntityType());
    }
    
    /**
     * Returns the loaded structure of the current entity.
     *
     * @param \Drupal\Core\Routing\RouteMatchInterface $route_match
     *   A RouteMatch object.
     *
     * @return array
     *   Array of page elements to render.
     */
    public function entityLoad(RouteMatchInterface $route_match) : array {
        $output = [];
        $entity = $this->getEntityWithFieldDefinitions($route_match);
        if ($entity instanceof EntityInterface) {
            // Field definitions are lazy loaded and are populated only when needed.
            // By calling ::getFieldDefinitions() we are sure that field definitions
            // are populated and available in the dump output.
            // @see https://www.drupal.org/node/2311557
            if ($entity instanceof FieldableEntityInterface) {
                $entity->getFieldDefinitions();
            }
            $output = $this->dumper
                ->exportAsRenderable($entity);
        }
        return $output;
    }
    
    /**
     * Returns the loaded structure of the current entity with references.
     *
     * @param \Drupal\Core\Routing\RouteMatchInterface $route_match
     *   A RouteMatch object.
     *
     * @return array
     *   Array of page elements to render.
     */
    public function entityLoadWithReferences(RouteMatchInterface $route_match) : array {
        $entity = $this->getEntityWithFieldDefinitions($route_match);
        if (!$entity instanceof EntityInterface) {
            return [];
        }
        return $this->dumper
            ->exportAsRenderable($entity, NULL, NULL, TRUE);
    }
    
    /**
     * Returns the render structure of the current entity.
     *
     * @param \Drupal\Core\Routing\RouteMatchInterface $route_match
     *   A RouteMatch object.
     *
     * @return array
     *   Array of page elements to render.
     */
    public function entityRender(RouteMatchInterface $route_match) : array {
        $output = [];
        $entity = $this->getEntityFromRouteMatch($route_match);
        if ($entity instanceof EntityInterface) {
            $entity_type_id = $entity->getEntityTypeId();
            $view_hook = $entity_type_id . '_view';
            $build = [];
            // If module implements own {entity_type}_view() hook use it, otherwise
            // fallback to the entity view builder if available.
            if (function_exists($view_hook)) {
                $build = $view_hook($entity);
            }
            elseif ($this->entityTypeManager
                ->hasHandler($entity_type_id, 'view_builder')) {
                $build = $this->entityTypeManager
                    ->getViewBuilder($entity_type_id)
                    ->view($entity);
            }
            $output = $this->dumper
                ->exportAsRenderable($build);
        }
        return $output;
    }
    
    /**
     * Return definitions for any related path aliases.
     *
     * @param \Drupal\Core\Routing\RouteMatchInterface $route_match
     *   A RouteMatch object.
     *
     * @return array
     *   Array of page elements to render.
     */
    public function pathAliases(RouteMatchInterface $route_match) : array {
        $entity = $this->getEntityFromRouteMatch($route_match);
        if ($entity === NULL) {
            return [];
        }
        $path = sprintf('/%s/%s', $entity->getEntityTypeId(), $entity->id());
        $aliases = $this->aliasStorage
            ->loadByProperties([
            'path' => $path,
        ]);
        $aliasCount = count($aliases);
        if ($aliasCount > 0) {
            $message = $this->translationManager
                ->formatPlural($aliasCount, 'Found 1 alias with path "@path."', 'Found @count aliases with path "@path".', [
                '@path' => $path,
            ]);
        }
        else {
            $message = $this->t('Found no aliases with path "@path".', [
                '@path' => $path,
            ]);
        }
        $build['header'] = [
            '#type' => 'html_tag',
            '#tag' => 'p',
            '#value' => $message,
        ];
        // Add alias dump to the response.
        $build['aliases'] = [];
        foreach ($aliases as $alias) {
            $build['aliases'][] = $this->dumper
                ->exportAsRenderable($alias);
        }
        return $build;
    }
    
    /**
     * Retrieves entity from route match.
     *
     * @param \Drupal\Core\Routing\RouteMatchInterface $route_match
     *   The route match.
     *
     * @return \Drupal\Core\Entity\EntityInterface|null
     *   The entity object as determined from the passed-in route match.
     */
    protected function getEntityFromRouteMatch(RouteMatchInterface $route_match) {
        $parameter_name = $route_match->getRouteObject()
            ->getOption('_devel_entity_type_id');
        return $route_match->getParameter($parameter_name);
    }
    
    /**
     * Returns an entity with field definitions from the given route match.
     *
     * @param \Drupal\Core\Routing\RouteMatchInterface $route_match
     *   The route match.
     *
     * @return \Drupal\Core\Entity\EntityInterface|null
     *   The entity object with field definitions as determined from the
     *   passed-in route match.
     */
    protected function getEntityWithFieldDefinitions(RouteMatchInterface $route_match) : ?EntityInterface {
        $entity = $this->getEntityFromRouteMatch($route_match);
        if (!$entity instanceof EntityInterface) {
            return NULL;
        }
        // Field definitions are lazy loaded and are populated only when needed.
        // By calling ::getFieldDefinitions() we are sure that field definitions
        // are populated and available in the dump output.
        // @see https://www.drupal.org/node/2311557
        if ($entity instanceof FieldableEntityInterface) {
            $entity->getFieldDefinitions();
        }
        return $entity;
    }

}