class ConfigTranslationController

class ConfigTranslationController extends ControllerBase {
    
    /**
     * The configuration mapper manager.
     *
     * @var \Drupal\config_translation\ConfigMapperManagerInterface
     */
    protected $configMapperManager;
    
    /**
     * The menu link access service.
     *
     * @var \Drupal\Core\Access\AccessManagerInterface
     */
    protected $accessManager;
    
    /**
     * The dynamic router service.
     *
     * @var \Symfony\Component\Routing\Matcher\RequestMatcherInterface
     */
    protected $router;
    
    /**
     * The path processor service.
     *
     * @var \Drupal\Core\PathProcessor\InboundPathProcessorInterface
     */
    protected $pathProcessor;
    
    /**
     * The current user.
     *
     * @var \Drupal\Core\Session\AccountInterface
     */
    protected $account;
    
    /**
     * The language manager.
     *
     * @var \Drupal\Core\Language\LanguageManagerInterface
     */
    protected $languageManager;
    
    /**
     * The renderer.
     *
     * @var \Drupal\Core\Render\RendererInterface
     */
    protected $renderer;
    
    /**
     * Constructs a ConfigTranslationController.
     *
     * @param \Drupal\config_translation\ConfigMapperManagerInterface $config_mapper_manager
     *   The configuration mapper manager.
     * @param \Drupal\Core\Access\AccessManagerInterface $access_manager
     *   The menu link access service.
     * @param \Symfony\Component\Routing\Matcher\RequestMatcherInterface $router
     *   The dynamic router service.
     * @param \Drupal\Core\PathProcessor\InboundPathProcessorInterface $path_processor
     *   The inbound path processor.
     * @param \Drupal\Core\Session\AccountInterface $account
     *   The current user.
     * @param \Drupal\Core\Language\LanguageManagerInterface $language_manager
     *   The language manager.
     * @param \Drupal\Core\Render\RendererInterface $renderer
     *   The renderer.
     */
    public function __construct(ConfigMapperManagerInterface $config_mapper_manager, AccessManagerInterface $access_manager, RequestMatcherInterface $router, InboundPathProcessorInterface $path_processor, AccountInterface $account, LanguageManagerInterface $language_manager, RendererInterface $renderer) {
        $this->configMapperManager = $config_mapper_manager;
        $this->accessManager = $access_manager;
        $this->router = $router;
        $this->pathProcessor = $path_processor;
        $this->account = $account;
        $this->languageManager = $language_manager;
        $this->renderer = $renderer;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container) {
        return new static($container->get('plugin.manager.config_translation.mapper'), $container->get('access_manager'), $container->get('router'), $container->get('path_processor_manager'), $container->get('current_user'), $container->get('language_manager'), $container->get('renderer'));
    }
    
    /**
     * Language translations overview page for a configuration name.
     *
     * @param \Symfony\Component\HttpFoundation\Request $request
     *   Page request object.
     * @param \Drupal\Core\Routing\RouteMatchInterface $route_match
     *   The route match.
     * @param string $plugin_id
     *   The plugin ID of the mapper.
     *
     * @return array
     *   Page render array.
     */
    public function itemPage(Request $request, RouteMatchInterface $route_match, $plugin_id) {
        
        /** @var \Drupal\config_translation\ConfigMapperInterface $mapper */
        $mapper = $this->configMapperManager
            ->createInstance($plugin_id);
        $mapper->populateFromRouteMatch($route_match);
        $page = [];
        $page['#title'] = $this->t('Translations for %label', [
            '%label' => $mapper->getTitle(),
        ]);
        $languages = $this->languageManager
            ->getLanguages();
        if (count($languages) == 1) {
            $this->messenger()
                ->addWarning($this->t('In order to translate configuration, the website must have at least two <a href=":url">languages</a>.', [
                ':url' => Url::fromRoute('entity.configurable_language.collection')->toString(),
            ]));
        }
        try {
            $original_langcode = $mapper->getLangcode();
            $operations_access = TRUE;
        } catch (ConfigMapperLanguageException $exception) {
            $items = [];
            foreach ($mapper->getConfigNames() as $config_name) {
                $langcode = $mapper->getLangcodeFromConfig($config_name);
                $items[] = $this->t('@name: @langcode', [
                    '@name' => $config_name,
                    '@langcode' => $langcode,
                ]);
            }
            $message = [
                'message' => [
                    '#markup' => $this->t('The configuration objects have different language codes so they cannot be translated:'),
                ],
                'items' => [
                    '#theme' => 'item_list',
                    '#items' => $items,
                ],
            ];
            $this->messenger()
                ->addWarning($this->renderer
                ->renderPlain($message));
            $original_langcode = LanguageInterface::LANGCODE_NOT_SPECIFIED;
            $operations_access = FALSE;
        }
        if (!isset($languages[$original_langcode])) {
            // If the language is not configured on the site, create a dummy language
            // object for this listing only to ensure the user gets useful info.
            $language_name = $this->languageManager
                ->getLanguageName($original_langcode);
            $languages[$original_langcode] = new Language([
                'id' => $original_langcode,
                'name' => $language_name,
            ]);
        }
        // We create a fake request object to pass into
        // ConfigMapperInterface::populateFromRouteMatch() for the different languages.
        // Creating a separate request for each language and route is neither easily
        // possible nor performant.
        $fake_request = $request->duplicate();
        $page['languages'] = [
            '#type' => 'table',
            '#header' => [
                $this->t('Language'),
                $this->t('Operations'),
            ],
        ];
        foreach ($languages as $language) {
            $langcode = $language->getId();
            // This is needed because
            // ConfigMapperInterface::getAddRouteParameters(), for example,
            // needs to return the correct language code for each table row.
            $fake_route_match = RouteMatch::createFromRequest($fake_request);
            $mapper->populateFromRouteMatch($fake_route_match);
            $mapper->setLangcode($langcode);
            // Prepare the language name and the operations depending on whether this
            // is the original language or not.
            if ($langcode == $original_langcode) {
                $language_name = '<strong>' . $this->t('@language (original)', [
                    '@language' => $language->getName(),
                ]) . '</strong>';
                // Check access for the path/route for editing, so we can decide to
                // include a link to edit or not.
                $edit_access = $this->accessManager
                    ->checkNamedRoute($mapper->getBaseRouteName(), $route_match->getRawParameters()
                    ->all(), $this->account);
                // Build list of operations.
                $operations = [];
                if ($edit_access) {
                    $operations['edit'] = [
                        'title' => $this->t('Edit'),
                        'url' => Url::fromRoute($mapper->getBaseRouteName(), $mapper->getBaseRouteParameters(), [
                            'query' => [
                                'destination' => $mapper->getOverviewPath(),
                            ],
                        ]),
                    ];
                }
            }
            else {
                $language_name = $language->getName();
                $operations = [];
                // If no translation exists for this language, link to add one.
                if (!$mapper->hasTranslation($language)) {
                    $operations['add'] = [
                        'title' => $this->t('Add'),
                        'url' => Url::fromRoute($mapper->getAddRouteName(), $mapper->getAddRouteParameters()),
                    ];
                }
                else {
                    // Otherwise, link to edit the existing translation.
                    $operations['edit'] = [
                        'title' => $this->t('Edit'),
                        'url' => Url::fromRoute($mapper->getEditRouteName(), $mapper->getEditRouteParameters()),
                    ];
                    $operations['delete'] = [
                        'title' => $this->t('Delete'),
                        'url' => Url::fromRoute($mapper->getDeleteRouteName(), $mapper->getDeleteRouteParameters()),
                    ];
                }
            }
            $page['languages'][$langcode]['language'] = [
                '#markup' => $language_name,
            ];
            $page['languages'][$langcode]['operations'] = [
                '#type' => 'operations',
                '#links' => $operations,
                // Even if the mapper contains multiple language codes, the source
                // configuration can still be edited.
'#access' => $langcode == $original_langcode || $operations_access,
            ];
        }
        return $page;
    }

}