<?php

/*
 * This file is part of the Assetic package, an OpenSky project.
 *
 * (c) 2010-2011 OpenSky Project Inc
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Assetic\Asset;

use Assetic\Filter\FilterCollection;
use Assetic\Filter\FilterInterface;

/**
 * A base abstract asset.
 *
 * The methods load() and getLastModified() are left undefined, although a
 * reusable doLoad() method is available to child classes.
 *
 * @author Kris Wallsmith <kris.wallsmith@gmail.com>
 */
abstract class BaseAsset implements AssetInterface
{
    private $filters;
    private $sourceUrl;
    private $targetUrl;
    private $content;
    private $loaded;

    /**
     * Constructor.
     *
     * @param array  $filters   Filters for the asset
     * @param string $sourceUrl The source URL
     */
    public function __construct($filters = array(), $sourceUrl = null)
    {
        $this->filters = new FilterCollection($filters);
        $this->sourceUrl = $sourceUrl;
    }

    public function ensureFilter(FilterInterface $filter)
    {
        $this->filters->ensure($filter);
    }

    public function getFilters()
    {
        return $this->filters->all();
    }

    /**
     * Encapsulates asset loading logic.
     *
     * @param string          $content          The asset content
     * @param FilterInterface $additionalFilter An additional filter
     */
    protected function doLoad($content, FilterInterface $additionalFilter = null)
    {
        $filter = clone $this->filters;
        if ($additionalFilter) {
            $filter->ensure($additionalFilter);
        }

        $asset = clone $this;
        $asset->setContent($content);

        $filter->filterLoad($asset);
        $this->content = $asset->getContent();

        $this->loaded = true;
    }

    public function dump(FilterInterface $additionalFilter = null)
    {
        if (!$this->loaded) {
            $this->load();
        }

        $filter = clone $this->filters;
        if ($additionalFilter) {
            $filter->ensure($additionalFilter);
        }

        $asset = clone $this;
        $filter->filterDump($asset);

        return $asset->getContent();
    }

    public function getContent()
    {
        return $this->content;
    }

    public function setContent($content)
    {
        $this->content = $content;
    }

    public function getSourceUrl()
    {
        return $this->sourceUrl;
    }

    public function getTargetUrl()
    {
        return $this->targetUrl;
    }

    public function setTargetUrl($targetUrl)
    {
        $this->targetUrl = $targetUrl;
    }
}