edlp_d8/web/modules/custom/edlp_agenda/src/Controller/AgendaController.php

<?php

namespace Drupal\edlp_agenda\Controller;

use Drupal\Core\Controller\ControllerBase;
use Drupal\Core\Datetime\DrupalDateTime;
use Drupal\Core\Url;
use Drupal\Core\Language\LanguageInterface;
// use Symfony\Component\HttpFoundation\JsonResponse;
use Drupal\Core\Cache\CacheableJsonResponse;
use Drupal\Core\Cache\CacheableMetadata;
use Drupal\core\render\RenderContext;

class AgendaController extends ControllerBase {


  private function query() {
    // @see https://www.webomelette.com/query-entities-using-dates-drupal-8

    $now = new DrupalDateTime('now');
    $now->setTimezone(new \DateTimeZone(DATETIME_STORAGE_TIMEZONE));

    $query = \Drupal::entityQuery('node')
      ->condition('status', 1)
      ->condition('type', 'evenement')
      ->condition('field_date', $now->format(DATETIME_DATETIME_STORAGE_FORMAT), '>=')
      ->sort('field_date');

    $this->future_nids = $query->execute();
    $this->future_nodes = entity_load_multiple('node', $this->future_nids);

    // $this->next_event_node = array_shift($this->future_nodes);

    $query = \Drupal::entityQuery('node')
      ->condition('status', 1)
      ->condition('type', 'evenement')
      ->condition('field_date', $now->format(DATETIME_DATETIME_STORAGE_FORMAT), '<')
      ->sort('field_date', 'DESC');

    $this->past_nids = $query->execute();
    $this->past_nodes = entity_load_multiple('node', $this->past_nids);
  }

  private function toRenderable(){
    $this->query();
    // dpm($this->next_event_node);

    return array(
      "#theme"=>'edlp_agenda',
      // '#next_event_node' => $this->next_event_node,
      "#coming_events_nodes" => $this->future_nodes,
      "#past_events_nodes" => $this->past_nodes,
    );

  }

  /**
   * Display agenda as a page.
   *
   * @return renderable array
   */
  public function agenda() {
    return $this->toRenderable();
  }

  /**
   * Get agenda data as json through ajax.
   *
   * @return json
   */
  public function agendajson() {

    $renderable = $this->toRenderable();
    // $rendered = render($renderable);
    // We can't render directly the entity as it throw an exception with cachable data
    //http://blog.dcycle.com/blog/2018-01-24/caching-drupal-8-rest-resource/#the-dreaded-leaked-metadata-error
    $rendered = \Drupal::service('renderer')->executeInRenderContext(new RenderContext(), function () use ($renderable) {
      return render($renderable);
    });

    $data = [
      'rendered'=> $rendered,
      'title'=>'Agenda',
    ];

    // translations links
    // use Drupal\Core\Url;
    // use Drupal\Core\Language\LanguageInterface;
    $route_name = 'edlp_agenda.agenda';
    $links = \Drupal::languageManager()->getLanguageSwitchLinks(LanguageInterface::TYPE_URL, Url::fromRoute($route_name));
    if (isset($links->links)) {
      $translations_build = [
        '#theme' => 'links__language_block',
        '#links' => $links->links,
        '#attributes' => ['class' => ["language-switcher-{$links->method_id}",],],
        '#set_active_class' => TRUE,
      ];
      $translations_rendered = \Drupal::service('renderer')->executeInRenderContext(new RenderContext(), function () use ($translations_build) {return render($translations_build);});

      $data['translations_links'] = $translations_rendered;
    }

    $data['#cache'] = [
      'max-age' => \Drupal\Core\Cache\Cache::PERMANENT,
      'tags' => ['edlp-agenda-cache'],
      'contexts' => [
        'languages:language_content'
      ]
    ];
    // $response = new JsonResponse();
    // $response->setData($data);
    $response = new CacheableJsonResponse($data);
    $response->addCacheableDependency(CacheableMetadata::createFromRenderArray($data));
    $response->addCacheableDependency(CacheableMetadata::createFromRenderArray($renderable));

    return $response;
  }
}