<?php

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

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

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

/**
 * Default jquery version.
 */
define('ADVAGG_JS_CDN_JQUERY_VERSION', '1.4.4');

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

/**
 * Default minification.
 */
define('ADVAGG_JS_CDN_COMPRESSION', TRUE);

/**
 * Implements hook_js_alter().
 */
function advagg_js_cdn_js_alter(&$javascript) {
  // Only modify if jquery_update is not enabled,
  if (module_exists('jquery_update')) {
    return;
  }

  // Setup variables.
  // JQuery.
  $jquery_version = variable_get('advagg_js_cdn_jquery_version', ADVAGG_JS_CDN_JQUERY_VERSION);
  $min = variable_get('advagg_js_cdn_compression', ADVAGG_JS_CDN_COMPRESSION) ? '.min' : '';
  // JQuery ui.
  $jquery_ui_version = variable_get('advagg_js_cdn_jquery_ui_version', ADVAGG_JS_CDN_JQUERY_UI_VERSION);
  $ui_mapping = advagg_js_cdn_get_ui_mapping();
  $add_in_ui = FALSE;

  foreach ($javascript as $name => $values) {
    // @ignore sniffer_commenting_inlinecomment_spacingbefore:4
    // @ignore sniffer_whitespace_openbracketspacing_openingwhitespace:8
    // Only modify if
    //  advagg_js_cdn_jquery is enabled,
    //  name is misc/jquery.js,
    //  and type is file.
    if (   variable_get('advagg_js_cdn_jquery', ADVAGG_JS_CDN_JQUERY)
        && $name == 'misc/jquery.js'
        && $javascript[$name]['type'] == 'file'
        ) {
      // Add in backup.
      $values['weight'] += 0.00001;
      $values['data'] = 'window.jQuery || document.write("<script src=\'' . base_path() . $values['data'] . '\'>\x3C/script>")';
      $values['type'] = 'inline';
      $javascript[$name . 'backup.js'] = $values;

      // Change core to external.
      $javascript[$name]['data'] = '//ajax.googleapis.com/ajax/libs/jquery/' . $jquery_version . '/jquery' . $min . '.js';
      $javascript[$name]['type'] = 'external';
    }

    // @ignore sniffer_commenting_inlinecomment_spacingbefore:4
    // @ignore sniffer_whitespace_openbracketspacing_openingwhitespace:8
    // Only modify if
    //  advagg_js_cdn_jquery_ui is enabled,
    //  name is in the $ui_mapping array.
    //  and type is file.
    if (   variable_get('advagg_js_cdn_jquery_ui', ADVAGG_JS_CDN_JQUERY_UI)
        && array_key_exists($name, $ui_mapping)
        && $javascript[$name]['type'] == 'file'
        ) {
      // We only need one file.
      if (!$add_in_ui) {
        // Add in backup.
        $values['weight'] += 0.00001;
        $values['data'] = 'window.jQuery.ui || document.write("<script src=\'' . base_path() . drupal_get_path('module', 'advagg_js_cdn') . '/js/jquery-ui.js' . '\'>\x3C/script>")';
        $values['type'] = 'inline';
        $javascript[$name . 'backup.js'] = $values;

        // Change core to external.
        $add_in_ui = TRUE;
        $javascript[$name]['data'] = '//ajax.googleapis.com/ajax/libs/jqueryui/' . $jquery_ui_version . '/jquery-ui' . $min . '.js';
        $javascript[$name]['type'] = 'external';
      }
      else {
        unset($javascript[$name]);
      }
    }
  }
}

/**
 * Return an array of jquery ui files.
 *
 * @return array
 *   array of jQuery UI file locations.
 */
function advagg_js_cdn_get_ui_mapping() {
  // Replace jQuery UI's JavaScript, beginning by defining the mapping.
  $ui_mapping = array(
    'misc/ui/jquery.effects.blind.min.js' => 'effects.blind',
    'misc/ui/jquery.effects.bounce.min.js' => 'effects.bounce',
    'misc/ui/jquery.effects.clip.min.js' => 'effects.clip',
    'misc/ui/jquery.effects.core.min.js' => 'effects.core',
    'misc/ui/jquery.effects.drop.min.js' => 'effects.drop',
    'misc/ui/jquery.effects.explode.min.js' => 'effects.explode',
    'misc/ui/jquery.effects.fade.min.js' => 'effects.fade',
    'misc/ui/jquery.effects.fold.min.js' => 'effects.fold',
    'misc/ui/jquery.effects.highlight.min.js' => 'effects.highlight',
    'misc/ui/jquery.effects.pulsate.min.js' => 'effects.pulsate',
    'misc/ui/jquery.effects.scale.min.js' => 'effects.scale',
    'misc/ui/jquery.effects.shake.min.js' => 'effects.shake',
    'misc/ui/jquery.effects.slide.min.js' => 'effects.slide',
    'misc/ui/jquery.effects.transfer.min.js' => 'effects.transfer',
    'misc/ui/jquery.ui.accordion.min.js' => 'ui.accordion',
    'misc/ui/jquery.ui.autocomplete.min.js' => 'ui.autocomplete',
    'misc/ui/jquery.ui.button.min.js' => 'ui.button',
    'misc/ui/jquery.ui.core.min.js' => 'ui.core',
    'misc/ui/jquery.ui.datepicker.min.js' => 'ui.datepicker',
    'misc/ui/jquery.ui.dialog.min.js' => 'ui.dialog',
    'misc/ui/jquery.ui.draggable.min.js' => 'ui.draggable',
    'misc/ui/jquery.ui.droppable.min.js' => 'ui.droppable',
    'misc/ui/jquery.ui.mouse.min.js' => 'ui.mouse',
    'misc/ui/jquery.ui.position.min.js' => 'ui.position',
    'misc/ui/jquery.ui.progressbar.min.js' => 'ui.progressbar',
    'misc/ui/jquery.ui.resizable.min.js' => 'ui.resizable',
    'misc/ui/jquery.ui.selectable.min.js' => 'ui.selectable',
    'misc/ui/jquery.ui.slider.min.js' => 'ui.slider',
    'misc/ui/jquery.ui.sortable.min.js' => 'ui.sortable',
    'misc/ui/jquery.ui.tabs.min.js' => 'ui.tabs',
    'misc/ui/jquery.ui.widget.min.js' => 'ui.widget',
  );
  return $ui_mapping;
}