<?php

/**
 * @file
 * Install, update and uninstall functions for the Menu link module.
 */

/**
 * Implements hook_field_schema().
 */
function menu_link_field_schema($field) {
  $menu_links = drupal_get_schema_unprocessed('system', 'menu_links');

  $schema = array(
    'columns' => array(
      'mlid' => array(
        'description' => 'The {menu_links}.mlid being referenced in this field.',
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
      ),

      // Columns below are being used for revision control.
      'menu_name'   => $menu_links['fields']['menu_name'],
      'plid'        => $menu_links['fields']['plid'],
      'link_path'   => $menu_links['fields']['link_path'],
      'link_title'  => $menu_links['fields']['link_title'],
      'options'     => $menu_links['fields']['options'],
      'hidden'      => $menu_links['fields']['hidden'],
      'expanded'    => $menu_links['fields']['expanded'],
      'weight'      => $menu_links['fields']['weight'],
    ),
    'indexes' => array(
      'mlid' => array('mlid'),
      'menu_plid' => array('menu_name', 'plid'),
    ),
    'foreign keys' => array(
      'menu_link' => array(
        'table' => 'menu_links',
        'columns' => array('mlid' => 'mlid'),
      ),
      'parent_menu_link' => array(
        'table' => 'menu_links',
        'columns' => array('plid' => 'mlid'),
      ),
    ),
  );

  if (module_exists('menu')) {
    $schema['foreign keys']['menu'] = array(
      'table' => 'menu_custom',
      'columns' => array('menu_name' => 'menu_name'),
    );
  }

  return $schema;
}