<?php

namespace Drupal\insa_blocks\Plugin\Block;

use Drupal\Core\Block\BlockBase;
use Drupal\media_entity\Entity\Media;
use Drupal\file\Entity\File;
use Drupal\Core\Cache\Cache;
/**
 * Provides a 'Banner' block.
 *
 * @Block(
 *  id = "banner",
 *  admin_label = @Translation("Banner"),
 * )
 */
class Banner extends BlockBase {

  /**
   * {@inheritdoc}
   */
  public function build() {
    $build = [];
    // Cas node uniquement.
    if ($node = \Drupal::service('current_route_match')->getParameter('node')) {
      // load the node.
      if (!method_exists($node, 'getType')) {
        $node = \Drupal\node\Entity\Node::load($node);
      }
      $node_type = $node->getType();
      // Vérification si field_banner est renseigné.
      if (!empty($node->field_banner[0]->target_id)) {
        $media_id = $node->field_banner[0]->target_id;
        $media = \Drupal::entityTypeManager()->getStorage('media')->load($media_id);
        $build['banner'] = \Drupal::entityTypeManager()->getViewBuilder('media')->view($media, 'wide');
      }
      else {
        $fid = FALSE;
        // Image par défaut.
        if (!empty(\Drupal::config('insa_config.adminsettings')->get($node_type)[0])) {
          $fid = \Drupal::config('insa_config.adminsettings')->get($node_type)[0];
        }

        if ($fid) {
          // Chargement de l'image.
          $file = File::load($fid);
          if ($file) {
            $build['banner'] = [
              '#theme' => 'responsive_image',
              '#uri' => $file->getFileUri(),
              '#responsive_image_style_id' => 'wide',
            ];
          }
        }
      }
    }

    return $build;
  }

  /**
   *
   */
  public function getCacheTags() {
    // With this when your node change your block will rebuild.
    if ($node = \Drupal::routeMatch()->getParameter('node')) {
      if (method_exists($node, 'id')) {
        // If there is node add its cachetag.
        return Cache::mergeTags(parent::getCacheTags(), array('node:' . $node->id()));
      } else {
        return Cache::mergeTags(parent::getCacheTags(), array('node:' . $node));
      }

    }
    else {
      // Return default tags instead.
      return parent::getCacheTags();
    }
  }

  /**
   *
   */
  public function getCacheContexts() {
    // If you depends on \Drupal::routeMatch()
    // you must set context of this block with 'route' context tag.
    // Every new route this block will rebuild.
    return Cache::mergeContexts(parent::getCacheContexts(), array('route'));
  }

}