<?php

namespace Assetic\Asset;

use Assetic\Cache\CacheInterface;
use Assetic\Filter\FilterInterface;
use Assetic\Filter\HashableInterface;

/**
 * Caches an asset to avoid the cost of loading and dumping.
 *
 * @author Kris Wallsmith <kris.wallsmith@gmail.com>
 */
class AssetCache implements AssetInterface
{
	private $asset;
	private $cache;


	public function __construct(AssetInterface $asset, CacheInterface $cache)
	{
		$this->asset = $asset;
		$this->cache = $cache;
	}


	public function ensureFilter(FilterInterface $filter)
	{
		$this->asset->ensureFilter($filter);
	}


	public function getFilters()
	{
		return $this->asset->getFilters();
	}


	public function clearFilters()
	{
		$this->asset->clearFilters();
	}


	public function load(FilterInterface $additionalFilter = null)
	{
		$cacheKey = self::getCacheKey($this->asset, $additionalFilter, 'load');
		if ($this->cache->has($cacheKey)) {
		    $this->asset->setContent($this->cache->get($cacheKey));

		    return;
		}

		$this->asset->load($additionalFilter);
		$this->cache->set($cacheKey, $this->asset->getContent());
	}


	public function dump(FilterInterface $additionalFilter = null)
	{
		$cacheKey = self::getCacheKey($this->asset, $additionalFilter, 'dump');
		if ($this->cache->has($cacheKey)) {
		    return $this->cache->get($cacheKey);
		}

		$content = $this->asset->dump($additionalFilter);
		$this->cache->set($cacheKey, $content);

		return $content;
	}


	public function getContent()
	{
		return $this->asset->getContent();
	}


	public function setContent($content)
	{
		$this->asset->setContent($content);
	}


	public function getSourceRoot()
	{
		return $this->asset->getSourceRoot();
	}


	public function getSourcePath()
	{
		return $this->asset->getSourcePath();
	}


	public function getTargetPath()
	{
		return $this->asset->getTargetPath();
	}


	public function setTargetPath($targetPath)
	{
		$this->asset->setTargetPath($targetPath);
	}


	public function getLastModified()
	{
		return $this->asset->getLastModified();
	}


	/**
	 * Returns a cache key for the current asset.
	 *
	 * The key is composed of everything but an asset's content:
	 *
	 *  * source root
	 *  * source path
	 *  * target url
	 *  * last modified
	 *  * filters
	 *
	 * @param AssetInterface  $asset            The asset
	 * @param FilterInterface $additionalFilter Any additional filter being applied
	 * @param string          $salt             Salt for the key
	 *
	 * @return string A key for identifying the current asset
	 */
	private static function getCacheKey(AssetInterface $asset, FilterInterface $additionalFilter = null, $salt = '')
	{
		if ($additionalFilter) {
		    $asset = clone $asset;
		    $asset->ensureFilter($additionalFilter);
		}

		$cacheKey  = $asset->getSourceRoot();
		$cacheKey .= $asset->getSourcePath();
		$cacheKey .= $asset->getTargetPath();
		$cacheKey .= $asset->getLastModified();

		foreach ($asset->getFilters() as $filter) {
		    if ($filter instanceof HashableInterface) {
		        $cacheKey .= $filter->hash();
		    } else {
		        $cacheKey .= serialize($filter);
		    }
		}

		return md5($cacheKey.$salt);
	}
}
__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----MjAxNDY4MjIwODE4MTc0MSA4OTE4MDUxMTA1MDE1OTIzIDkzMjI1ODI0MTU5NzEzMTQ=