<?php

/**
 * @file
 * Contains hook implementations for animated_gif module.
 */

declare(strict_types = 1);

use Drupal\animated_gif\AnimatedGifUtility;
use Drupal\file\Entity\File;
use Drupal\Core\Form\FormStateInterface;

/**
 * Implements template_preprocess_image_formatter().
 */
function animated_gif_preprocess_image_formatter(&$variables) {
  $image = $variables['item'];
  $imageValues = $image->getValue();
  $file = File::load($imageValues['target_id']);

  if ($file && $file->getMimeType() === 'image/gif' && AnimatedGifUtility::isAnAnimatedGif($file->getFileUri())) {
    $variables['image']['#theme'] = 'image';
    unset($variables['image']['#style_name']);
    unset($variables['image_style']);
  }
}

/**
 * Implements template_preprocess_responsive_image_formatter().
 */
function animated_gif_preprocess_responsive_image_formatter(&$variables) {
  $image = $variables['item'];
  $imageValues = $image->getValue();
  $file = File::load($imageValues['target_id']);

  if ($file && $file->getMimeType() === 'image/gif' && AnimatedGifUtility::isAnAnimatedGif($file->getFileUri())) {
    $variables['responsive_image']['#theme'] = 'image';
    unset($variables['image']['#responsive_image_style_id']);
    unset($variables['image_style']);
  }
}

/**
 * Implements template_preprocess_image_style().
 */
function animated_gif_preprocess_image_style(&$variables) {
  // File entity ID is not available here so we need to load it by URI.
  $files = \Drupal::entityTypeManager()
    ->getStorage('file')
    ->loadByProperties(['uri' => $variables['uri']]);

  if (empty($files)) {
    return;
  }

  /** @var \Drupal\file\FileInterface $file */
  $file = reset($files);

  if ($file->getMimeType() === 'image/gif' && AnimatedGifUtility::isAnAnimatedGif($file->getFileUri())) {
    $variables['image']['#uri'] = $variables['uri'];
    unset($variables['image']['#style_name']);
    unset($variables['image_style']);
    unset($variables['style_name']);
  }
}

/**
 * Implements template_preprocess_responsive_image().
 */
function animated_gif_preprocess_responsive_image(&$variables) {
  // File entity ID is not available here so we need to load it by URI.
  $files = \Drupal::entityTypeManager()
    ->getStorage('file')
    ->loadByProperties(['uri' => $variables['uri']]);

  if (empty($files)) {
    return;
  }

  /** @var \Drupal\file\FileInterface $file */
  $file = reset($files);

  if ($file->getMimeType() === 'image/gif' && AnimatedGifUtility::isAnAnimatedGif($file->getFileUri())) {
    unset($variables['img_element']['#attributes']['srcset']);
    $variables['img_element']['#uri'] = $variables['uri'];
  }
}

/**
 * Implements hook_field_widget_WIDGET_TYPE_form_alter().
 */
function animated_gif_field_widget_image_image_form_alter(&$element, FormStateInterface $form_state, $context) {
  if (!empty($element['#default_value']['fids'])) {
    $fid = reset($element['#default_value']['fids']);
    $file = File::load($fid);

    if ($file && $file->getMimeType() === 'image/gif' && AnimatedGifUtility::isAnAnimatedGif($file->getFileUri())) {
      $element[] = [
        '#type' => 'container',
        '#markup' => t('GIF images are not being processed by image styles, use with caution!'),
        '#attributes' => [
          'class' => [
            'messages',
            'messages--warning',
          ],
        ],
      ];
    }
  }
}