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<?php

/**
 * @file
 * Hooks and functions for the minifyjs module.
 */

use Drupal\Core\Asset\AttachedAssetsInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Url;

define('MINIFYJS_CACHE_CID', 'minifyjs:all_files');

/**
 * Implements hook_FORM_ID_alter().
 */
function minifyjs_form_system_performance_settings_alter(array &$form, FormStateInterface $form_state, $form_id) {
  if (\Drupal::currentUser()->hasPermission('administer minifyjs')) {

    // Determine the number of files minified.
    $files = \Drupal::service('minifyjs')->loadAllFiles();
    $files_minified = 0;
    foreach ($files as $file) {
      if (!empty($file->minified_uri)) {
        $files_minified++;
      }
    }

    $form['bandwidth_optimization']['use_minified_javascript'] = [
      '#type'          => 'checkbox',
      '#title'         => t('Use Minified JavaScript files.'),
      '#disabled'      => ($files_minified) ? FALSE : TRUE,
      '#description'   => t(
        'Toggle minified javascript files on or off. There are @minified minified files out of @total total files available. <a href=":href">Click here to manage your javascript files</a>.',
        [
          '@minified' => $files_minified,
          '@total'    => count($files),
          ':href'     => Url::fromUri('base:/admin/config/development/performance/js')->toString(),
        ]
      ),
      '#default_value' => \Drupal::config('minifyjs.config')->get('use_minified'),
    ];

    $form['#submit'][] = 'minifyjs_system_performance_settings_submit';
  }
}

/**
 * Helper function to handle submit hook in form alter.
 *
 * @param array $form
 *   The form array.
 * @param \Drupal\Core\Form\FormStateInterface $form_state
 *   The form state.
 */
function minifyjs_system_performance_settings_submit(array &$form, FormStateInterface $form_state) {
  \Drupal::service('config.factory')->getEditable('minifyjs.config')
    ->set('use_minified', $form_state->getValue('use_minified_javascript'))
    ->save();
}

/**
 * Implements hook_js_alter().
 */
function minifyjs_js_alter(array &$scripts, AttachedAssetsInterface $assets) {

  // Determine if the replacement needs to be performed.
  $do_replace = FALSE;
  if (\Drupal::config('minifyjs.config')->get('use_minified')) {
    if (\Drupal::config('minifyjs.config')->get('disable_admin')) {
      if (!\Drupal::service('router.admin_context')->isAdminRoute()) {
        $do_replace = TRUE;
      }
    }
    else {
      $do_replace = TRUE;
    }
  }

  if ($do_replace) {

    // Files array is keyed by file id. To make this operation as fast as
    // possible, the array should be keyed by file uri. Also, shorten the
    // array by removing files that are not minified.
    $files = \Drupal::service('minifyjs')->loadAllFiles();
    $minified_files = [];
    foreach ($files as $file) {
      if (!empty($file->minified_uri)) {
        $minified_files[$file->uri] = $file;
      }
    }

    // Update the scripts array with new file info.
    foreach ($scripts as $path => $file) {
      if (isset($minified_files[$path])) {
        $scripts[$path]['data'] = $minified_files[$path]->minified_uri;
        minifyjs_update_scripts($scripts, $path, $minified_files[$path]->minified_uri);
      }
    }
  }
}

/**
 * Update script.
 *
 * Helper function to change array key, without changing its order.
 *
 * @param array $scripts
 *   The scripts that are attached to the page.
 * @param string $existing
 *   The existing file uri.
 * @param string $new
 *   The new file uri.
 */
function minifyjs_update_scripts(array &$scripts, $existing, $new) {
  $keys = array_keys($scripts);
  $index = array_search($existing, $keys, TRUE);
  if ($index !== FALSE) {
    $keys[$index] = $new;
    $scripts = array_combine($keys, $scripts);
  }
}

/**
 * Batch - minify file operation.
 *
 * @param int $fid
 *   The file id of the file to minify.
 * @param array $context
 *   The batch context.
 */
function minifyjs_batch_minify_file_operation($fid, array &$context) {

  // Set the context message.
  $files = \Drupal::service('minifyjs')->loadAllFiles();
  $file = $files[$fid];
  $context['message'] = t('Minifying file - %file', ['%file' => $file->uri]);

  // Perform the minification.
  $result = \Drupal::service('minifyjs')->minifyFile($fid);
  if ($result === TRUE) {
    isset($context['results']['success']) ? $context['results']['success']++ : $context['results']['success'] = 1;
    $context['results']['operation'] = 'minify';
  }
  else {
    $context['results']['errors'][] = $result;
  }
}

/**
 * Batch - remove minified file operation.
 *
 * @param int $fid
 *   The file if of the file to remove.
 * @param array $context
 *   The batch context.
 */
function minifyjs_batch_remove_minified_file_operation($fid, array &$context) {

  // Set the context message.
  $files = \Drupal::service('minifyjs')->loadAllFiles();
  $file = $files[$fid];
  $context['message'] = t('Restoring un-minified file - %file', ['%file' => $file->uri]);

  // Perform the restore.
  $result = \Drupal::service('minifyjs')->removeMinifiedFile($fid);
  if ($result === TRUE) {
    isset($context['results']['success']) ? $context['results']['success']++ : $context['results']['success'] = 1;
    $context['results']['operation'] = 'restore';
  }
  else {
    $context['results']['errors'][] = $result;
  }
}

/**
 * Batch - finished.
 *
 * @param bool $success
 *   Batch finished successfully or not.
 * @param array $results
 *   The results of the batch.
 * @param array $operations
 *   The operations remaining to run (only present if there was an error).
 */
function minifyjs_batch_finished($success, array $results, array $operations) {

  // Output successful operations.
  if (isset($results['success'])) {
    if ($results['operation'] == 'minify') {
      \Drupal::messenger()->addMessage(t('%count files were minified.', ['%count' => $results['success']]));
    }
    if ($results['operation'] == 'restore') {
      \Drupal::messenger()->addMessage(t('%count files were restored.', ['%count' => $results['success']]));
    }
  }

  // Output errors.
  if (isset($results['errors'])) {
    if (count($results['errors'])) {
      foreach ($results['errors'] as $error) {
        \Drupal::messenger()->addMessage($error, 'error');
      }
    }
  }

  // Clear the cache so this change will be reflected in
  // \Drupal::service('minifyjs')->loadAllFiles().
  \Drupal::cache()->delete(MINIFYJS_CACHE_CID);
}