<?php
// $Id: i18nmenu.module,v 1.2.2.3 2008-06-24 11:17:34 jareyero Exp $

/**
 * Internationalization (i18n) submodule: Menu translation
 *
 * @author Jose A. Reyero, 2005
 *
 */

/**
 * Implementation of hook_locale().
 */
function i18nmenu_locale($op = 'groups', $group = NULL) {
  switch ($op) {
    case 'groups':
      return array('menu' => t('Menu'));
    case 'refresh':
      if ($group == 'menu') {
        return i18nmenu_locale_refresh();
      }      
  }
}

/**
 * Refresh locale strings
 */
function i18nmenu_locale_refresh() {
  foreach (menu_get_menus() as $name => $title) {
    $tree = menu_tree_all_data($name);
    i18nmenu_localize_tree($tree);
  }
}

/**
 * Implementation of hook_menu_link_alter().
 * 
 * Catch changed links, update language and refresh texts
 */
function i18nmenu_menu_link_alter(&$item, $menu) {
  // If we set option to language it causes an error with the link system
  // This should handle language only as the links are being manually updated
  if (!empty($item['language'])) {
    $item['options']['langcode'] = $item['language'];
  } elseif(isset($item['language'])) {
    unset($item['options']['langcode']);
  }
  // @ TO DO: Refresh texts
  //dsm($item);
  //$original = $item['original_item'];
  //$item['router_path'] = _menu_find_router_path($menu, $item['link_path']);
  //i18nmenu_make_translatable($item);
}

/**
 * Implementation of hook_help()
 */
function i18nmenu_help($section, $arg) {
  switch ($section) {
    case 'admin/help#i18nmenu' :
      $output = '<p>'.t('This module provides support for translatable custom menu items:').'</p>';
      $output .= '<ul>';
      $output .= '<li>'.t('Create menus as usual, with names in English or the default language. If the menu is already created, no changes are needed.').'</li>';
      $output .= '<li>'.t('Use the localization system to translate menu item strings').'</li>';
      $output .= '<li>'.t('Instead of the old menus use the new blocks provided by the module. These will be localized.').'</li>';
      $output .= '<li>'.t('Optionally, you can set up a language for a menu item so it is only displayed for that language.').'</li>';
      $output .= '</ul>';
      return $output;
  }
}

/**
 * Get localized menu tree
 */
function i18nmenu_translated_tree($menu_name) {
  static $menu_output = array();

  if (!isset($menu_output[$menu_name])) {
    $tree = menu_tree_page_data($menu_name);
    i18nmenu_localize_tree($tree);
    $menu_output[$menu_name] = menu_tree_output($tree);
  }
  return $menu_output[$menu_name];
}

/**
 * Localize menu tree
 */
function i18nmenu_localize_tree(&$tree) {
  global $language;
  foreach($tree as $index => $item) {
    $link = $item['link'];
    if ($link['customized']) {
      // Remove links for other languages than current
      // Links with language wont be localized
      if (!empty($link['options']['langcode'])) {
        if($link['options']['langcode'] != $language->language) {
          unset($tree[$index]);
          //dsm("Removed because language:".$link['title'].' language='.$link['options']['langcode']);
        }
      } else {
        $router = i18nmenu_get_router($link['router_path']);
        // If the title is the same it will be localized by the menu system
        if ($link['link_title'] != $router['title']){
          //$tree[$index]['link']['title'] = 'Translated';
          $tree[$index]['link']['title'] = tt('menu:item:'.$link['mlid'].':title', $link['link_title'], NULL, TRUE);
        }
      }
    }
  }
}

/**
 * Get the menu router for this router path
 * 
 * We need the untranslated title to comparte, and this will be fast
 * There's no api function to do this?
 */
function i18nmenu_get_router($path) {
  static $cache = array();
  if (!array_key_exists($path, $cache)) {
    $cache[$path] = db_fetch_array(db_query("SELECT title FROM {menu_router} WHERE path = '%s'", $path));
  }
  return $cache[$path];
}

/**
 * Implementation of hook_form_alter().
 */
function i18nmenu_form_alter(&$form, $form_state, $form_id){
  if ($form_id == 'menu_edit_item') {
    //dsm ($form);
    if ($form['menu']['#item'] && isset($form['menu']['#item']['options']['langcode'])) {
      $language = $form['menu']['#item']['options']['langcode'];
    } else {
      $language = '';
    }
    $form['menu']['language'] = array(
      '#type' => 'select',
      '#title' => t('Language'),
      '#options' => array('' => t('All languages')) + locale_language_list('name'),
      '#default_value' => $language,
    );
  }
}