<?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\Common\Cache\Cache as CacheAdapter;
use Doctrine\Common\Cache\CacheProvider;
use Doctrine\Common\Cache\MultiGetCache;
use Doctrine\ORM\Cache;
use Doctrine\ORM\Cache\Persister\Collection\NonStrictReadWriteCachedCollectionPersister;
use Doctrine\ORM\Cache\Persister\Collection\ReadOnlyCachedCollectionPersister;
use Doctrine\ORM\Cache\Persister\Collection\ReadWriteCachedCollectionPersister;
use Doctrine\ORM\Cache\Persister\Entity\NonStrictReadWriteCachedEntityPersister;
use Doctrine\ORM\Cache\Persister\Entity\ReadOnlyCachedEntityPersister;
use Doctrine\ORM\Cache\Persister\Entity\ReadWriteCachedEntityPersister;
use Doctrine\ORM\Cache\Region;
use Doctrine\ORM\Cache\Region\DefaultMultiGetRegion;
use Doctrine\ORM\Cache\Region\DefaultRegion;
use Doctrine\ORM\Cache\Region\FileLockRegion;
use Doctrine\ORM\Cache\Region\UpdateTimestampCache;
use Doctrine\ORM\EntityManagerInterface;
use Doctrine\ORM\Mapping\ClassMetadata;
use Doctrine\ORM\Persisters\Collection\CollectionPersister;
use Doctrine\ORM\Persisters\Entity\EntityPersister;

/**
 * @since   2.5
 * @author  Fabio B. Silva <fabio.bat.silva@gmail.com>
 */
class DefaultCacheFactory implements CacheFactory
{
    /**
     * @var CacheAdapter
     */
    private $cache;

    /**
     * @var \Doctrine\ORM\Cache\RegionsConfiguration
     */
    private $regionsConfig;

    /**
     * @var \Doctrine\ORM\Cache\TimestampRegion|null
     */
    private $timestampRegion;

    /**
     * @var \Doctrine\ORM\Cache\Region[]
     */
    private $regions = array();

    /**
     * @var string|null
     */
    private $fileLockRegionDirectory;

    /**
     * @param RegionsConfiguration $cacheConfig
     * @param CacheAdapter         $cache
     */
    public function __construct(RegionsConfiguration $cacheConfig, CacheAdapter $cache)
    {
        $this->cache         = $cache;
        $this->regionsConfig = $cacheConfig;
    }

    /**
     * @param string $fileLockRegionDirectory
     */
    public function setFileLockRegionDirectory($fileLockRegionDirectory)
    {
        $this->fileLockRegionDirectory = (string) $fileLockRegionDirectory;
    }

    /**
     * @return string
     */
    public function getFileLockRegionDirectory()
    {
        return $this->fileLockRegionDirectory;
    }

    /**
     * @param \Doctrine\ORM\Cache\Region $region
     */
    public function setRegion(Region $region)
    {
        $this->regions[$region->getName()] = $region;
    }

    /**
     * @param \Doctrine\ORM\Cache\TimestampRegion $region
     */
    public function setTimestampRegion(TimestampRegion $region)
    {
        $this->timestampRegion = $region;
    }

    /**
     * {@inheritdoc}
     */
    public function buildCachedEntityPersister(EntityManagerInterface $em, EntityPersister $persister, ClassMetadata $metadata)
    {
        $region     = $this->getRegion($metadata->cache);
        $usage      = $metadata->cache['usage'];

        if ($usage === ClassMetadata::CACHE_USAGE_READ_ONLY) {
            return new ReadOnlyCachedEntityPersister($persister, $region, $em, $metadata);
        }

        if ($usage === ClassMetadata::CACHE_USAGE_NONSTRICT_READ_WRITE) {
            return new NonStrictReadWriteCachedEntityPersister($persister, $region, $em, $metadata);
        }

        if ($usage === ClassMetadata::CACHE_USAGE_READ_WRITE) {
            return new ReadWriteCachedEntityPersister($persister, $region, $em, $metadata);
        }

        throw new \InvalidArgumentException(sprintf("Unrecognized access strategy type [%s]", $usage));
    }

    /**
     * {@inheritdoc}
     */
    public function buildCachedCollectionPersister(EntityManagerInterface $em, CollectionPersister $persister, array $mapping)
    {
        $usage      = $mapping['cache']['usage'];
        $region     = $this->getRegion($mapping['cache']);

        if ($usage === ClassMetadata::CACHE_USAGE_READ_ONLY) {
            return new ReadOnlyCachedCollectionPersister($persister, $region, $em, $mapping);
        }

        if ($usage === ClassMetadata::CACHE_USAGE_NONSTRICT_READ_WRITE) {
            return new NonStrictReadWriteCachedCollectionPersister($persister, $region, $em, $mapping);
        }

        if ($usage === ClassMetadata::CACHE_USAGE_READ_WRITE) {
            return new ReadWriteCachedCollectionPersister($persister, $region, $em, $mapping);
        }

        throw new \InvalidArgumentException(sprintf("Unrecognized access strategy type [%s]", $usage));
    }

    /**
     * {@inheritdoc}
     */
    public function buildQueryCache(EntityManagerInterface $em, $regionName = null)
    {
        return new DefaultQueryCache(
            $em,
            $this->getRegion(
                array(
                    'region' => $regionName ?: Cache::DEFAULT_QUERY_REGION_NAME,
                    'usage'  => ClassMetadata::CACHE_USAGE_NONSTRICT_READ_WRITE
                )
            )
        );
    }

    /**
     * {@inheritdoc}
     */
    public function buildCollectionHydrator(EntityManagerInterface $em, array $mapping)
    {
        /* @var $targetPersister \Doctrine\ORM\Cache\Persister\CachedPersister */
        $targetPersister = $em->getUnitOfWork()->getEntityPersister($mapping['targetEntity']);

        return new DefaultCollectionHydrator(
            $em,
            $targetPersister->getCacheRegion()
        );
    }

    /**
     * {@inheritdoc}
     */
    public function buildEntityHydrator(EntityManagerInterface $em, ClassMetadata $metadata)
    {
        return new DefaultEntityHydrator($em);
    }

    /**
     * {@inheritdoc}
     */
    public function getRegion(array $cache)
    {
        if (isset($this->regions[$cache['region']])) {
            return $this->regions[$cache['region']];
        }

        $cacheAdapter = clone $this->cache;

        if ($cacheAdapter instanceof CacheProvider) {
            $cacheAdapter->setNamespace($cache['region']);
        }

        $name     = $cache['region'];
        $lifetime = $this->regionsConfig->getLifetime($cache['region']);

        $region = ($cacheAdapter instanceof MultiGetCache)
            ? new DefaultMultiGetRegion($name, $cacheAdapter, $lifetime)
            : new DefaultRegion($name, $cacheAdapter, $lifetime);

        if ($cache['usage'] === ClassMetadata::CACHE_USAGE_READ_WRITE) {

            if ( ! $this->fileLockRegionDirectory) {
                throw new \LogicException(
                    'If you what to use a "READ_WRITE" cache an implementation of "Doctrine\ORM\Cache\ConcurrentRegion" is required, ' .
                    'The default implementation provided by doctrine is "Doctrine\ORM\Cache\Region\FileLockRegion" if you what to use it please provide a valid directory, DefaultCacheFactory#setFileLockRegionDirectory(). '
                );
            }

            $directory = $this->fileLockRegionDirectory . DIRECTORY_SEPARATOR . $cache['region'];
            $region    = new FileLockRegion($region, $directory, $this->regionsConfig->getLockLifetime($cache['region']));
        }

        return $this->regions[$cache['region']] = $region;
    }

    /**
     * {@inheritdoc}
     */
    public function getTimestampRegion()
    {
        if ($this->timestampRegion === null) {
            $name     = Cache::DEFAULT_TIMESTAMP_REGION_NAME;
            $lifetime = $this->regionsConfig->getLifetime($name);

            $this->timestampRegion = new UpdateTimestampCache($name, clone $this->cache, $lifetime);
        }

        return $this->timestampRegion;
    }

    /**
     * {@inheritdoc}
     */
    public function createCache(EntityManagerInterface $em)
    {
        return new DefaultCache($em);
    }
}
