<?php

/**
 * @file
 * Advanced aggregation js cdn library 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 value to see if SWFObject should be grabbed from the Google CDN.
 */
define('ADVAGG_JS_CDN_SWFOBJECT', TRUE);

/**
 * Implement hook_advagg_js_pre_alter.
 */
function advagg_js_cdn_advagg_js_pre_alter(&$javascript, $preprocess_js, $public_downloads, $scope) {
  // Exit early if we are not going to CDN any code.
  $cdn_jquery = variable_get('advagg_js_cdn_jquery', ADVAGG_JS_CDN_JQUERY);
  $cdn_jquery_ui = variable_get('advagg_js_cdn_jquery_ui', ADVAGG_JS_CDN_JQUERY_UI);
  $cdn_swfobject = variable_get('advagg_js_cdn_swfobject', ADVAGG_JS_CDN_SWFOBJECT);
  if (   !$cdn_jquery
       && !$cdn_jquery_ui
       && !$cdn_swfobject
        ) {
    return FALSE;
  }

  // Set filepaths/versions
  $jquery_version = variable_get('advagg_js_cdn_jquery_version', '1.2.6');
  $jquery_filepath = 'misc/jquery.js';
  if (module_exists('jquery_update') && variable_get('jquery_update_replace', TRUE)) {
    // jquery_update_get_version hits disk and doesn't get cached.
    // advagg_js_cdn_advagg_js_pre_alter will run mutiple times per request so
    // caching the value of $jquery_update_version here.
    static $jquery_update_version;
    if (empty($jquery_update_version)) {
      $jquery_update_version = variable_get('advagg_js_cdn_jquery_update_version', jquery_update_get_version());
    }
    $jquery_update_filepath = advagg_js_cdn_get_jquery_path();
  }
  if (module_exists('jquery_ui')) {
    // jquery_ui_get_version hits disk and doesn't get cached.
    // advagg_js_cdn_advagg_js_pre_alter will run mutiple times per request so
    // caching the value of jquery_ui_get_version here.
    static $jquery_ui_version;
    if (empty($jquery_ui_version)) {
      $jquery_ui_version = jquery_ui_get_version();
    }
    $jquery_ui_path = advagg_js_cdn_get_jquery_ui_path();
  }
  if (module_exists('swftools')) {
    $swfobject_version = variable_get('advagg_js_cdn_swfobject_version', '2.2');
    if (function_exists('swftools_get_player_path')) {
      $swfobject_filepath = swftools_get_player_path() . '/swfobject2/swfobject.js';
    }
    elseif (function_exists('swftools_get_library')) {
      $swfobject_filepath = swftools_get_library('swfobject') . '/swfobject.js';
    }
  }

  // http or https.
  $schema = advagg_get_server_schema();
  foreach ($javascript as $type => $data) {
    // Skip inline and setting js.
    if (!$data || $type == 'setting' || $type == 'inline') {
      continue;
    }

    // Search and replace.
    foreach ($data as $path => $info) {
      // jquery.js
      if ($cdn_jquery) {
        if (   isset($jquery_update_filepath)
            && (   $path == $jquery_update_filepath . '/jquery.min.js'
                || $path == $jquery_update_filepath . '/jquery.js'
                  )
              ) {
          $info['preprocess'] = FALSE;
          $javascript['external'][$schema . '://ajax.googleapis.com/ajax/libs/jquery/' . $jquery_update_version . '/jquery.min.js'] = $info;
          unset($javascript[$type][$path]);
        }
        elseif ($path == $jquery_filepath) {
          $info['preprocess'] = FALSE;
          $javascript['external'][$schema . '://ajax.googleapis.com/ajax/libs/jquery/' . $jquery_version . '/jquery.min.js'] = $info;
          unset($javascript[$type][$path]);
        }
      }

      // Replace all jquery_ui scripts (jquery.ui.*.js) with a single
      // Google-hosted minified version containing all of them.
      if ($cdn_jquery_ui) {
        if (   isset($jquery_ui_path)
            && isset($jquery_ui_version)
            && strpos($path, $jquery_ui_path) === 0
              ) {
          $info['preprocess'] = FALSE;
          $javascript['external'][$schema . '://ajax.googleapis.com/ajax/libs/jqueryui/' . $jquery_ui_version . '/jquery-ui.min.js'] = $info;
          unset($javascript[$type][$path]);
        }
      }

      // swfobject.js
      if ($cdn_swfobject) {
        if (   isset($swfobject_filepath)
             && $path == $swfobject_filepath
              ) {
          $info['preprocess'] = FALSE;
          $javascript['external'][$schema . '://ajax.googleapis.com/ajax/libs/swfobject/' . $swfobject_version . '/swfobject.js'] = $info;
          unset($javascript[$type][$path]);
        }
      }
    }
  }
}

/**
 * Get the path for the jquery-ui.js file.
 *
 * @param string $file
 *   filename.
 */
function advagg_js_cdn_get_jquery_ui_path() {
  $jquery_ui_path_const = 'JQUERY_UI_PATH';
  if (!defined($jquery_ui_path_const)) {
    if (!function_exists('jquery_ui_get_path')) {
      return FALSE;
    }
    $jquery_ui_path = jquery_ui_get_path();
    if ($jquery_ui_path === FALSE) {
      return FALSE;
    }
  }
  else {
    $jquery_ui_path = constant($jquery_ui_path_const);
  }
  $jquery_ui_path .= '/ui';

  return $jquery_ui_path;
}

/**
 * Get the path for the jquery.js file.
 *
 * @return
 *   path to jquery.js file.
 */
function advagg_js_cdn_get_jquery_path() {
  if (function_exists('jquery_update_jquery_path')) {
    return dirname(jquery_update_jquery_path());
  }
  else {
    $jquery_update_filepath = drupal_get_path('module', 'jquery_update');
    return $jquery_update_filepath . '/replace/';
  }
}