<?php

namespace Drupal\uw_cfg_common\Service;

use Drupal\Core\Entity\EntityInterface;

/**
 * Class UWService
 *
 * @package Drupal\uw_cfg_common\Service
 */
class UWService implements UWServiceInterface {

  /**
   * {@inheritDoc}
   */
  public function prepareResponsiveImage(EntityInterface $entity, string $image_style): array {
    // Load in the file object if we have one.
    if ($file = $entity->field_media_image->entity) {
      // Need to set these variables so that responsive image function,
      // has all the necessary info to process the image style.
      $variables['uri'] = $file->getFileUri();
      $variables['responsive_image_style_id'] = $image_style;

      // These is a function from the responsive image module that sets all
      // the variables for the sources of the responsive image.
      template_preprocess_responsive_image($variables);

      // Step through each of the sources and setup our own sources array.
      foreach ($variables['sources'] as $source) {
        $variables['responsive_sources'][] = [
          'srcset' => $source->storage()['srcset']->value(),
          'media' => $source->storage()['media']->value(),
          'type' => $source->storage()['type']->value(),
        ];
      }

      return $variables;
    }

    return [];
  }

}