<?php
// $Id: activemenu.module,v 1.21 2007-03-14 01:58:11 nedjo Exp $

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

/**
 * Implementation of hook_menu().
 */
function activemenu_menu($may_cache) {
  $items = array();
  if ($may_cache) {
    // Need to load includes here because we need access to menu item definitions.
    // The call below (after the else) is too late.
    jstools_modules_includes('activemenu');
    $items[] = array(
      'path' => 'activemenu/menu',
      'title' => t('activemenu'),
      'access' => user_access('access content'),
      'type' => MENU_CALLBACK,
      'callback' => 'activemenu_js'
    );
  }
  else {
    jstools_modules_includes('activemenu');
    activemenu_load();
  }
  $items = array_merge($items, module_invoke_all('activemenu_menu', $may_cache));
  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');
    }
    $loaded = TRUE;
  }
}

/**
 * Menu callback. Output a themed menu tree for a requested menu item.
 */
function activemenu_js() {
  if ($path = activemenu_get_request_path()) {
    $menu = menu_get_menu();
    $pid = $menu['path index'][$path];
    print drupal_to_js(array('status' => TRUE, 'content' => theme('menu_tree', $pid)));
  }
  exit();
}

/**
 * Implementation of hook_footer().
 *
 * Add a theme-specific css file if needed. Pass Javascript data to the browser.
 */
function activemenu_footer() {
  global $theme;

  $file = drupal_get_path('module', 'activemenu') .'/theme/'. $theme .'.css';
  if (file_exists($file)) {
    drupal_add_css($file);
  }
  else {
    drupal_add_css(drupal_get_path('module', 'activemenu') .'/activemenu.css', 'theme');
  }

}

/**
 * Read the incoming request and return the correct path.
 */
function activemenu_get_request_path(){
  return isset($_POST['path']) ? drupal_get_normal_path($_POST['path']) : FALSE;
}