<?php

/*
 * This file is part of the symfony package.
 * (c) 2004-2006 Fabien Potencier <fabien.potencier@symfony-project.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

/**
 *
 * @package    symfony
 * @subpackage util
 * @author     Nick Lane <nick.lane@internode.on.net>
 * @author     Fabien Potencier <fabien.potencier@symfony-project.com>
 * @version    SVN: $Id: sfPropelManyToMany.class.php 1931 2006-09-02 17:56:18Z fabien $
 */
class sfPropelManyToMany
{
  public static function getColumn($class, $middleClass)
  {
    // find the related class
    $tableMap = call_user_func(array($middleClass.'Peer', 'getTableMap'));
    $object_table_name = constant($class.'Peer::TABLE_NAME');
    foreach ($tableMap->getColumns() as $column)
    {
      if ($column->isForeignKey() && $object_table_name == $column->getRelatedTableName())
      {
        return $column;
      }
    }
  }

  public static function getRelatedColumn($class, $middleClass)
  {
    // find the related class
    $tableMap = call_user_func(array($middleClass.'Peer', 'getTableMap'));
    $object_table_name = constant($class.'Peer::TABLE_NAME');
    foreach ($tableMap->getColumns() as $column)
    {
      if ($column->isForeignKey() && $object_table_name != $column->getRelatedTableName())
      {
        return $column;
      }
    }
  }

  public static function getRelatedClass($class, $middleClass)
  {
    $column = self::getRelatedColumn($class, $middleClass);

    // we must load all map builder classes
    $classes = sfFinder::type('file')->name('*MapBuilder.php')->in(sfLoader::getModelDirs());
    foreach ($classes as $class)
    {
      $class_map_builder = basename($class, '.php');
      $map = new $class_map_builder();
      $map->doBuild();
    }

    $tableMap = call_user_func(array($middleClass.'Peer', 'getTableMap'));

    return $tableMap->getDatabaseMap()->getTable($column->getRelatedTableName())->getPhpName();
  }

  public static function getAllObjects($object, $middleClass, $criteria = null)
  {
    if (null === $criteria)
    {
      $criteria = new Criteria();
    }

    $relatedClass = self::getRelatedClass(get_class($object), $middleClass);

    return call_user_func(array($relatedClass.'Peer', 'doSelect'), $criteria);
  }

  /**
   * Gets objects related by a many-to-many relationship, with a middle table.
   *
   * @param  $object        The object to get related objects for.
   * @param  $middleClass   The middle class used for the many-to-many relationship.
   * @param  $criteria      Criteria to apply to the selection.
   */
  public static function getRelatedObjects($object, $middleClass, $criteria = null)
  {
    if (null === $criteria)
    {
      $criteria = new Criteria();
    }

    $relatedClass = self::getRelatedClass(get_class($object), $middleClass);

    $relatedObjects = array();
    $objectMethod = 'get'.$middleClass.'sJoin'.$relatedClass;
    $relatedMethod = 'get'.$relatedClass;
    $rels = $object->$objectMethod($criteria);
    foreach ($rels as $rel)
    {
      $relatedObjects[] = $rel->$relatedMethod();
    }

    return $relatedObjects;
  }
}