<?php

namespace Base\OAuthBundle\EventListener;

use Doctrine\ORM\Events;
use Doctrine\ORM\Event\LoadClassMetadataEventArgs;
use Doctrine\Common\EventSubscriber;

class DynamicRelationSubscriber implements EventSubscriber
{
    /**
     * {@inheritDoc}
     */
    public function getSubscribedEvents()
    {
        return array(
            Events::loadClassMetadata,
        );
    }

    /**
     * @param LoadClassMetadataEventArgs $eventArgs
     */
    public function loadClassMetadata(LoadClassMetadataEventArgs $eventArgs)
    {
        // the $metadata is the whole mapping info for this class
        $metadata = $eventArgs->getClassMetadata();
        $classes = array(
            'Base\OAuthBundle\Entity\AccessToken',
            'Base\OAuthBundle\Entity\AuthCode',
            'Base\OAuthBundle\Entity\RefreshToken'
        );
        
        if (!in_array($metadata->getName(), $classes)) {
            return;
        }

        $namingStrategy = $eventArgs
            ->getEntityManager()
            ->getConfiguration()
            ->getNamingStrategy()
        ;
        
        $userClass = 'Base\UserBundle\Entity\User';
        $OAuthUserClass = '\Base\OAuthBundle\Security\Core\User\CustomOAuthUser';
        
        $metadata->mapManyToMany(array(
            'targetEntity'  => class_exists($userClass) ? $userClass : $OAuthUserClass,
            'fieldName'     => 'user',
            'cascade'       => array('persist'),
            'joinTable'     => array(
                'name'        => strtolower($namingStrategy->classToTableName($metadata->getName())) . '_user',
                'joinColumns' => array(
                    array(
                        'name'                  => $namingStrategy->joinKeyColumnName($metadata->getName()),
                        'referencedColumnName'  => $namingStrategy->referenceColumnName(),
                        'onDelete'  => 'CASCADE',
                        'onUpdate'  => 'CASCADE',
                    ),
                ),
                'inverseJoinColumns'    => array(
                    array(
                        'name'                  => 'user_id',
                        'referencedColumnName'  => $namingStrategy->referenceColumnName(),
                        'onDelete'  => 'CASCADE',
                        'onUpdate'  => 'CASCADE',
                    ),
                )
            )
        ));
    }
}