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<?php

/**
 * @file
 * Contains update functions for Panel Button module.
 */

/**
 * Implements hook_requirements().
 */
function panelbutton_requirements($phase) {
  $requirements = [];

  // @todo Remove backward compatibility conditions when we bump Drupal
  //   requirement to 8.9.0. See https://www.drupal.org/node/3099614
  if (\Drupal::hasService('library.libraries_directory_file_finder')) {
    /** @var \Drupal\Core\Asset\LibrariesDirectoryFileFinder $library_file_finder */
    $path = \Drupal::service('library.libraries_directory_file_finder')->find('panelbutton/plugin.js');
  }
  else {
    $path = DRUPAL_ROOT . '/libraries/panelbutton/plugin.js';
    if (\Drupal::moduleHandler()->moduleExists('libraries')) {
      $path = libraries_get_path('panelbutton') . '/plugin.js';
    }
  }

  if (!file_exists($path)) {
    $requirements['panelbutton'] = [
      'title' => t('Panelbutton library is missing'),
      'value' => t('Plugin not detected'),
      'severity' => REQUIREMENT_ERROR,
      'description' => t('Panelbutton requires the plugin.js library.
       Download the plugin from http://ckeditor.com/addon/panelbutton at least
       version 4.5.6, and place it in the libraries folder 
       (/libraries/panelbutton)'),
    ];
  }
  else {
    $requirements['panelbutton'] = [
      'title' => t('CKEditor Panelbutton'),
      'value' => t('Plugin detected'),
      'severity' => REQUIREMENT_OK,
    ];
  }

  return $requirements;
}