<?php

/**
 * @file
 * Advanced aggregation js cdn module.
 */

/**
 * @addtogroup default_variables
 * @{
 */

/**
 * Default value to see if jquery-ui should be grabbed from the Google CDN.
 */
define('ADVAGG_CSS_CDN_JQUERY_UI', TRUE);

/**
 * Default jquery ui version.
 */
define('ADVAGG_CSS_CDN_JQUERY_UI_VERSION', '1.8.7');

/**
 * @} End of "addtogroup default_variables".
 */

/**
 * @addtogroup hooks
 * @{
 */

/**
 * Implements hook_css_alter().
 */
function advagg_css_cdn_css_alter(&$css) {
  // Only modify if jquery_update is not enabled.
  if (module_exists('jquery_update')) {
    return;
  }

  // Setup variables.
  // jquery ui.
  $jquery_ui_version = variable_get('advagg_css_cdn_jquery_ui_version', ADVAGG_CSS_CDN_JQUERY_UI_VERSION);
  $ui_mapping = advagg_css_cdn_get_ui_mapping();

  foreach ($css as $name => $values) {
    // Only modify if
    // advagg_css_cdn_jquery_ui is enabled,
    // name is in the $ui_mapping array.
    // and type is file.
    if (variable_get('advagg_css_cdn_jquery_ui', ADVAGG_CSS_CDN_JQUERY_UI)
      && array_key_exists($name, $ui_mapping)
      && $css[$name]['type'] === 'file'
    ) {
      $css[$name]['data'] = '//ajax.googleapis.com/ajax/libs/jqueryui/' . $jquery_ui_version . '/themes/base/jquery.' . $ui_mapping[$name] . '.css';
      $css[$name]['type'] = 'external';

      // Fallback does not work do to
      // "SecurityError: The operation is insecure.".
    }
  }
}

/**
 * @} End of "addtogroup hooks".
 */

/**
 * @addtogroup advagg_hooks
 * @{
 */

/**
 * Implements hook_advagg_css_groups_alter().
 */
function advagg_css_cdn_advagg_css_groups_alter(&$css_groups, $preprocess_css) {
  // Work around a bug with seven_css_alter.
  // http://drupal.org/node/1937860
  $theme_keys[] = $GLOBALS['theme'];
  if (!empty($GLOBALS['base_theme_info'])) {
    foreach ($GLOBALS['base_theme_info'] as $base) {
      $theme_keys[] = $base->name;
    }
  }
  $match = FALSE;
  foreach ($theme_keys as $name) {
    if ($name === 'seven') {
      $match = TRUE;
    }
  }
  if (empty($match)) {
    return;
  }

  $target = FALSE;
  $last_group = FALSE;
  $last_key = FALSE;
  $kill_key = FALSE;
  $replaced = FALSE;
  foreach ($css_groups as $key => $group) {
    if (empty($target)) {
      if ($group['type'] === 'external' && $group['preprocess'] && $preprocess_css) {
        foreach ($group['items'] as $k => $value) {
          if ($value['data'] === 'themes/seven/jquery.ui.theme.css') {
            // Type should be file and not external (core bug).
            $value['type'] = 'file';
            $target = $value;
            unset($css_groups[$key]['items'][$k]);
            if (empty($css_groups[$key]['items'])) {
              unset($css_groups[$key]);
              $kill_key = $key;
            }
          }
        }
      }
    }
    else {
      $diff = array_merge(array_diff_assoc($group['browsers'], $target['browsers']), array_diff_assoc($target['browsers'], $group['browsers']));
      if ($group['type'] != $target['type']
        || $group['group'] != $target['group']
        || $group['every_page'] != $target['every_page']
        || $group['media'] != $target['media']
        || $group['media'] != $target['media']
        || $group['preprocess'] != $target['preprocess']
        || !empty($diff)
      ) {
        if (!empty($last_group)) {
          $diff = array_merge(array_diff_assoc($last_group['browsers'], $target['browsers']), array_diff_assoc($target['browsers'], $last_group['browsers']));
          if ($last_group['type'] != $target['type']
            || $last_group['group'] != $target['group']
            || $last_group['every_page'] != $target['every_page']
            || $last_group['media'] != $target['media']
            || $last_group['media'] != $target['media']
            || $last_group['preprocess'] != $target['preprocess']
            || !empty($diff)
          ) {
            // Insert New.
            $css_groups[$kill_key] = array(
              'group' => $target['group'],
              'type' => $target['type'],
              'every_page' => $target['every_page'],
              'media' => $target['media'],
              'preprocess' => $target['preprocess'],
              'browsers' => $target['browsers'],
              'items' => array($target),
            );
            $replaced = TRUE;
          }
          else {
            // Insert above.
            $css_groups[$last_key]['items'][] = $target;
            $replaced = TRUE;
          }
        }
      }
      else {
        // Insert below.
        array_unshift($css_groups[$key]['items'], $target);
        $replaced = TRUE;
      }
    }
    $last_group = $group;
    $last_key = $key;
    if ($replaced) {
      break;
    }
  }
  ksort($css_groups);
}

/**
 * @} End of "addtogroup advagg_hooks".
 */

/**
 * Return an array of jquery ui files.
 */
function advagg_css_cdn_get_ui_mapping() {
  // Replace jQuery UI's CSS, beginning by defining the mapping.
  $ui_mapping = array(
    'misc/ui/jquery.ui.accordion.css' => 'ui.accordion',
    'misc/ui/jquery.ui.autocomplete.css' => 'ui.autocomplete',
    'misc/ui/jquery.ui.button.css' => 'ui.button',
    'misc/ui/jquery.ui.core.css' => 'ui.core',
    'misc/ui/jquery.ui.datepicker.css' => 'ui.datepicker',
    'misc/ui/jquery.ui.dialog.css' => 'ui.dialog',
    'misc/ui/jquery.ui.progressbar.css' => 'ui.progressbar',
    'misc/ui/jquery.ui.resizable.css' => 'ui.resizable',
    'misc/ui/jquery.ui.selectable.css' => 'ui.selectable',
    'misc/ui/jquery.ui.slider.css' => 'ui.slider',
    'misc/ui/jquery.ui.tabs.css' => 'ui.tabs',
    'misc/ui/jquery.ui.theme.css' => 'ui.theme',
  );
  return $ui_mapping;
}