<?php
// $Id: activemenu.module,v 1.4 2008-12-29 22:38:47 nedjo Exp $

/**
 * @file
 * Add AJAX-based tree menu to navigation menu.
 */

/**
 * Implementation of hook_init().
 */
function activemenu_init() {
  jstools_modules_includes('activemenu');
  activemenu_load();
}

/**
 * Implementation of hook_menu().
 */
function activemenu_menu() {
  $items = array();

  $items['activemenu/menu'] = array(
    'title' => 'activemenu',
    'access arguments' => array('access content'),
    'type' => MENU_CALLBACK,
    'page callback' => 'activemenu_js'
  );

  $items = array_merge($items, module_invoke_all('activemenu_menu'));
  return $items;
}

/**
 * Load needed files.
 */
function activemenu_load() {
  static $loaded = FALSE;
  if (!$loaded) {
    $path = drupal_get_path('module', 'activemenu');
    jstools_add_js($path . '/activemenu.js');
    $activemenu = module_invoke_all('activemenu');
    if (count($activemenu)) {
      drupal_add_js(array('activemenu' => $activemenu), 'setting');
    }
    activemenu_theme_css();
    $loaded = TRUE;
  }
}

/**
 * Menu callback. Output a themed menu tree for a requested menu item.
 */
function activemenu_js() {
  if ($path = activemenu_get_request_path()) {
    if ($plid = db_result(db_query("SELECT mlid FROM {menu_links} WHERE link_path = '%s'", $path))) {
      $item = menu_link_load($plid);
      // Retrieve the access checked tree
      $tree = menu_tree_all_data($item['menu_name'], $item);

      print drupal_to_js(array('status' => TRUE, 'content' => menu_tree_output($tree)));
    }
  }

  exit();
}

/**
 * Implementation of hook_footer().
 *
 * Add a theme-specific css file if needed. Pass Javascript data to the browser.
 */
function activemenu_theme_css() {
  global $custom_theme, $theme, $user;
 
  if (isset($user->theme) && $user->theme != '') {
    $current_theme = $user->theme;
  }
  elseif (!empty($custom_theme)) {
    $current_theme = $custom_theme;
  }
  else {
    $current_theme = $theme ? $theme : variable_get('theme_default', 'garland');
  }
 
  $path = drupal_get_path('module', 'activemenu');
  $file = $path .'/theme/'. $current_theme .'.css';
  if (file_exists($file)) {
    drupal_add_css($file);
  }
  else {
    drupal_add_css($path .'/activemenu.css', 'theme');
  }
}

/**
 * Read the incoming request and return the correct path.
 */
function activemenu_get_request_path(){
  global $language;

  // Handle path prefixing.
  $langcode = '';
  if (module_exists('locale') && isset($_POST['path'])) {
    $_GET['q'] = $_POST['path'];
    // $language_initialize will remove a language prefix from $_GET['q'], if present.
    if (variable_get('language_count', 1) != 1) {
      $language = language_initialize();
    }

    // We can now use the correct path without a prefix.
    $_POST['path'] = $_GET['q'];
    $langcode = ($language != language_default()) ? $language->language : '';
  }
  return isset($_POST['path']) ? drupal_get_normal_path($_POST['path'], $langcode) : FALSE;
}