<?php

/*

 * This file is part of the Symfony framework.

 *

 * (c) Fabien Potencier <fabien@symfony.com>

 *

 * This source file is subject to the MIT license that is bundled

 * with this source code in the file LICENSE.

 */

namespace Symfony\Bundle\AsseticBundle\Controller;

use Assetic\Asset\AssetCache;

use Assetic\Asset\AssetInterface;

use Assetic\Factory\LazyAssetManager;

use Assetic\Cache\CacheInterface;

use Symfony\Component\HttpFoundation\Request;

use Symfony\Component\HttpFoundation\Response;

use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;

/**

 * Serves assets.

 *

 * @author Kris Wallsmith <kris@symfony.com>

 */

class AsseticController

{

    protected $request;

    protected $am;

    protected $cache;

    public function __construct(Request $request, LazyAssetManager $am, CacheInterface $cache)

    {

        $this->request = $request;

        $this->am = $am;

        $this->cache = $cache;

    }

    public function render($name, $pos = null)

    {

        if (!$this->am->has($name)) {

            throw new NotFoundHttpException(sprintf('The "%s" asset could not be found.', $name));

        }

        $asset = $this->am->get($name);

        if (null !== $pos && !$asset = $this->findAssetLeaf($asset, $pos)) {

            throw new NotFoundHttpException(sprintf('The "%s" asset does not include a leaf at position %d.', $name, $pos));

        }

        $response = $this->createResponse();

        // last-modified

        if (null !== $lastModified = $asset->getLastModified()) {

            $date = new \DateTime();

            $date->setTimestamp($lastModified);

            $response->setLastModified($date);

        }

        // etag

        if ($this->am->hasFormula($name)) {

            $formula = $this->am->getFormula($name);

            $formula['last_modified'] = $lastModified;

            $response->setETag(md5(serialize($formula)));

        }

        if ($response->isNotModified($this->request)) {

            return $response;

        }

        $response->setContent($this->cachifyAsset($asset)->dump());

        return $response;

    }

    protected function createResponse()

    {

        return new Response();

    }

    protected function cachifyAsset(AssetInterface $asset)

    {

        return new AssetCache($asset, $this->cache);

    }

    private function findAssetLeaf(\Traversable $asset, $pos)

    {

        $i = 0;

        foreach ($asset as $leaf) {

            if ($pos == $i++) {

                return $leaf;

            }

        }

    }

}