<?php

/*
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * and is licensed under the MIT license. For more information, see
 * <http://www.doctrine-project.org>.
 */

namespace Doctrine\ORM\Cache;

use Doctrine\ORM\Query;
use Doctrine\ORM\Cache\EntityCacheKey;
use Doctrine\ORM\Mapping\ClassMetadata;
use Doctrine\ORM\EntityManagerInterface;
use Doctrine\ORM\Cache\EntityCacheEntry;

/**
 * Default hydrator cache for entities
 *
 * @since   2.5
 * @author  Fabio B. Silva <fabio.bat.silva@gmail.com>
 */
class DefaultEntityHydrator implements EntityHydrator
{
    /**
     * @var \Doctrine\ORM\EntityManager
     */
    private $em;

    /**
     * @var \Doctrine\ORM\UnitOfWork
     */
    private $uow;

    /**
     * @var array
     */
    private static $hints = array(Query::HINT_CACHE_ENABLED => true);

    /**
     * @param \Doctrine\ORM\EntityManagerInterface $em The entity manager.
     */
    public function __construct(EntityManagerInterface $em)
    {
        $this->em   = $em;
        $this->uow  = $em->getUnitOfWork();
    }

    /**
     * {@inheritdoc}
     */
    public function buildCacheEntry(ClassMetadata $metadata, EntityCacheKey $key, $entity)
    {
        $data = $this->uow->getOriginalEntityData($entity);
        $data = array_merge($data, $key->identifier); // why update has no identifier values ?

        foreach ($metadata->associationMappings as $name => $assoc) {

            if ( ! isset($data[$name])) {
                continue;
            }

            if ( ! isset($assoc['cache']) || ! ($assoc['type'] & ClassMetadata::TO_ONE)) {
                unset($data[$name]);

                continue;
            }

            if ( ! isset($assoc['id'])) {
                $data[$name] = $this->uow->getEntityIdentifier($data[$name]);

                continue;
            }

            // handle association identifier
            $targetId = is_object($data[$name]) && $this->em->getMetadataFactory()->hasMetadataFor(get_class($data[$name]))
                ? $this->uow->getEntityIdentifier($data[$name])
                : $data[$name];

            // @TODO - fix it !
            // handle UnitOfWork#createEntity hash generation
            if ( ! is_array($targetId)) {

                $data[reset($assoc['joinColumnFieldNames'])] = $targetId;

                $targetEntity = $this->em->getClassMetadata($assoc['targetEntity']);
                $targetId     = array($targetEntity->identifier[0] => $targetId);
            }

            $data[$name] = $targetId;
        }

        return new EntityCacheEntry($metadata->name, $data);
    }

    /**
     * {@inheritdoc}
     */
    public function loadCacheEntry(ClassMetadata $metadata, EntityCacheKey $key, EntityCacheEntry $entry, $entity = null)
    {
        $data  = $entry->data;
        $hints = self::$hints;

        if ($entity !== null) {
            $hints[Query::HINT_REFRESH]         = true;
            $hints[Query::HINT_REFRESH_ENTITY]  = $entity;
        }

        foreach ($metadata->associationMappings as $name => $assoc) {
            if ( ! isset($assoc['cache']) ||  ! isset($data[$name])) {
                continue;
            }

            $assocId        = $data[$name];
            $assocPersister = $this->uow->getEntityPersister($assoc['targetEntity']);
            $assocRegion    = $assocPersister->getCacheRegion();
            $assocEntry     = $assocRegion->get(new EntityCacheKey($assoc['targetEntity'], $assocId));

            if ($assocEntry === null) {
                return null;
            }

            $data[$name] = $assoc['fetch'] === ClassMetadata::FETCH_EAGER || ($assoc['type'] === ClassMetadata::ONE_TO_ONE && ! $assoc['isOwningSide'])
                ? $this->uow->createEntity($assocEntry->class, $assocEntry->data, $hints)
                : $this->em->getReference($assocEntry->class, $assocId);
        }

        if ($entity !== null) {
            $this->uow->registerManaged($entity, $key->identifier, $data);
        }

        return $this->uow->createEntity($entry->class, $data, $hints);
    }
}