FacetBlockAjaxController.php

<?php

namespace Drupal\facets\Controller;

use Drupal\Core\Ajax\AjaxResponse;
use Drupal\Core\Ajax\InvokeCommand;
use Drupal\Core\Ajax\ReplaceCommand;
use Drupal\Core\Block\BlockManager;
use Drupal\Core\Controller\ControllerBase;
use Drupal\Core\Http\RequestStack as DrupalRequestStack;
use Drupal\Core\Path\CurrentPathStack;
use Drupal\Core\PathProcessor\PathProcessorManager;
use Drupal\Core\Render\RendererInterface;
use Drupal\Core\Routing\CurrentRouteMatch;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\RequestStack as SymfonyRequestStack;
use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
use Symfony\Component\Routing\RouterInterface;

/**
 * Defines a controller to load a facet via AJAX.
 */
class FacetBlockAjaxController extends ControllerBase {

  /**
   * The entity storage for block.
   *
   * @var \Drupal\Core\Entity\EntityStorageInterface
   */
  protected $storage;

  /**
   * The current path.
   *
   * @var \Drupal\Core\Path\CurrentPathStack
   */
  protected $currentPath;

  /**
   * 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 route match service.
   *
   * @var \Drupal\Core\Routing\CurrentRouteMatch
   */
  protected $currentRouteMatch;

  /**
   * The block manager service.
   *
   * @var \Drupal\Core\Block\BlockManager
   */
  protected $blockManager;

  /**
   * Constructs a FacetBlockAjaxController object.
   *
   * @param \Drupal\Core\Path\CurrentPathStack $currentPath
   *   The current path service.
   * @param \Symfony\Component\Routing\RouterInterface $router
   *   The router service.
   * @param \Drupal\Core\PathProcessor\PathProcessorManager $pathProcessor
   *   The path processor manager.
   * @param \Drupal\Core\Routing\CurrentRouteMatch $currentRouteMatch
   *   The current route match service.
   * @param \Drupal\Core\Block\BlockManager $blockManager
   *   The block manager service.
   */
  public function __construct(CurrentPathStack $currentPath, RouterInterface $router, PathProcessorManager $pathProcessor, CurrentRouteMatch $currentRouteMatch, BlockManager $blockManager) {
    $this->storage = $this->entityTypeManager()->getStorage('block');
    $this->currentPath = $currentPath;
    $this->router = $router;
    $this->pathProcessor = $pathProcessor;
    $this->currentRouteMatch = $currentRouteMatch;
    $this->blockManager = $blockManager;
  }

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container) {
    return new static(
      $container->get('path.current'),
      $container->get('router'),
      $container->get('path_processor_manager'),
      $container->get('current_route_match'),
      $container->get('plugin.manager.block')
    );
  }

  /**
   * Loads and renders the facet blocks via AJAX.
   *
   * @param \Symfony\Component\HttpFoundation\Request $request
   *   The current request object.
   *
   * @return \Drupal\Core\Ajax\AjaxResponse
   *   The ajax response.
   *
   * @throws \Symfony\Component\HttpKernel\Exception\NotFoundHttpException
   *   Thrown when the view was not found.
   */
  public function ajaxFacetBlockView(Request $request) {
    $response = new AjaxResponse();

    // Rebuild the request and the current path, needed for facets.
    $path = $request->request->get('facet_link');
    $facets_blocks = $request->request->all()['facets_blocks'] ?? [];

    // Ensure path is relative.
    $host = $request->getSchemeAndHttpHost();
    if (str_starts_with($path, $host)) {
      $path = substr($path, strlen($host));
    }

    // Remove base_path in case the site is installed in a subdirectory.
    $base_path = base_path();
    if ($base_path !== '/' && str_starts_with($path, $base_path)) {
      $path = substr($path, strlen($base_path));
    }

    if (empty($path) || empty($facets_blocks)) {
      throw new NotFoundHttpException('No facet link or facet blocks found.');
    }

    $new_request = Request::create($path);
    $request_stack = new DrupalRequestStack();

    // Add session to the response if set.
    if ($request->hasSession()) {
      $request->getSession()->save();
      $new_request->setSession($request->getSession());
    }

    $processed = $this->pathProcessor->processInbound($path, $new_request);
    $processed_request = Request::create($processed);

    $this->currentPath->setPath($processed_request->getPathInfo());
    $request->attributes->add($this->router->matchRequest($new_request));
    $this->currentRouteMatch->resetRouteMatch();
    $request_stack->push($new_request);

    $container = \Drupal::getContainer();
    $container->set('request_stack', $request_stack);
    foreach ($facets_blocks as $block_selector => $block_id) {
      // Facet block render array.
      $block_view = NULL;
      // Re prepare from css standarts.
      $block_id = str_replace(['--', '-'], [':', '_'], $block_id);

      // @todo We should not create an instance if we have already created one.
      $block_instance = $this->blockManager->createInstance($block_id);
      if ($block_instance) {
        $block_view = $block_instance->build();
        if ($block_view) {
          // Replace content current ID selector.
          $response->addCommand(new ReplaceCommand('#' . $block_selector, $block_view));
          // Hide or show block.
          $facet_id = explode(':', $block_id)[1];
          $hide_show_selector = '[data-drupal-block-facet-id = "' . $facet_id . '"]';
          if (!empty($block_view['facet_block']['#attributes']['class']) && in_array('hidden', $block_view['facet_block']['#attributes']['class'])) {
            $response->addCommand(new InvokeCommand($hide_show_selector, 'addClass', ['hidden']));
          }
          else {
            $response->addCommand(new InvokeCommand($hide_show_selector, 'removeClass', ['hidden']));
          }
        }
      }
    }

    // Update filter summary block.
    $update_summary_block = $request->request->get('update_summary_block');
    if ($update_summary_block) {
      $facet_summary_plugin_ids = $request->request->all()['facet_summary_plugin_ids'] ?? [];
      foreach ($facet_summary_plugin_ids as $block_selector => $summary_plugin_id) {
        // Facet summary block render array.
        $block_view = NULL;
        // @todo We should not create an instance if we have already created one.
        $block_instance = $this->blockManager->createInstance($summary_plugin_id);
        if ($block_instance) {
          $block_view = $block_instance->build();
          if ($block_view) {
            // Replace content facets summary plugin ID selector.
            $response->addCommand(new ReplaceCommand('[data-drupal-facets-summary-plugin-id = "' . $summary_plugin_id . '"]', $block_view));
            // Hide or show block.
            $hide_show_selector = '[data-drupal-block-facet-summary-id = "' . $summary_plugin_id . '"]';
            if (!empty($block_view['facets_summary']['#attributes']['class']) && in_array('hidden', $block_view['facets_summary']['#attributes']['class'])) {
              $response->addCommand(new InvokeCommand($hide_show_selector, 'addClass', ['hidden']));
            }
            else {
              $response->addCommand(new InvokeCommand($hide_show_selector, 'removeClass', ['hidden']));
            }
          }
        }
      }
    }

    return $response;
  }

}