<?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\Templating;

use Assetic\Asset\AssetInterface;

use Assetic\Factory\AssetFactory;

use Assetic\Util\TraversableString;

use Symfony\Component\Templating\Helper\Helper;

/**

 * The "assetic" templating helper.

 *

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

 */

abstract class AsseticHelper extends Helper

{

    protected $factory;

    /**

     * Constructor.

     *

     * @param AssetFactory $factory The asset factory

     */

    public function __construct(AssetFactory $factory)

    {

        $this->factory = $factory;

    }

    /**

     * Returns an array of javascript urls.

     */

    public function javascripts($inputs = array(), $filters = array(), array $options = array())

    {

        if (!isset($options['output'])) {

            $options['output'] = 'js/*.js';

        }

        return $this->getAssetUrls($inputs, $filters, $options);

    }

    /**

     * Returns an array of stylesheet urls.

     */

    public function stylesheets($inputs = array(), $filters = array(), array $options = array())

    {

        if (!isset($options['output'])) {

            $options['output'] = 'css/*.css';

        }

        return $this->getAssetUrls($inputs, $filters, $options);

    }

    /**

     * Returns an array of one image url.

     */

    public function image($inputs = array(), $filters = array(), array $options = array())

    {

        if (!isset($options['output'])) {

            $options['output'] = 'images/*';

        }

        $options['single'] = true;

        return $this->getAssetUrls($inputs, $filters, $options);

    }

    /**

     * Gets the URLs for the configured asset.

     *

     * Usage looks something like this:

     *

     *     <?php foreach ($view['assetic']->assets('@jquery, js/src/core/*', '?yui_js') as $url): ?>

     *         <script src="<?php echo $url ?>" type="text/javascript"></script>

     *     <?php endforeach; ?>

     *

     * When in debug mode, the helper returns an array of one or more URLs.

     * When not in debug mode it returns an array of one URL.

     *

     * @param array|string $inputs  An array or comma-separated list of input strings

     * @param array|string $filters An array or comma-separated list of filter names

     * @param array        $options An array of options

     *

     * @return array An array of URLs for the asset

     */

    private function getAssetUrls($inputs = array(), $filters = array(), array $options = array())

    {

        $explode = function($value)

        {

            return array_map('trim', explode(',', $value));

        };

        if (!is_array($inputs)) {

            $inputs = $explode($inputs);

        }

        if (!is_array($filters)) {

            $filters = $explode($filters);

        }

        if (!isset($options['debug'])) {

            $options['debug'] = $this->factory->isDebug();

        }

        if (!isset($options['combine'])) {

            $options['combine'] = !$options['debug'];

        }

        if (isset($options['single']) && $options['single'] && 1 < count($inputs)) {

            $inputs = array_slice($inputs, -1);

        }

        if (!isset($options['name'])) {

            $options['name'] = $this->factory->generateAssetName($inputs, $filters, $options);

        }

        $asset = $this->factory->createAsset($inputs, $filters, $options);

        $one = $this->getAssetUrl($asset, $options);

        $many = array();

        if ($options['combine']) {

            $many[] = $one;

        } else {

            $i = 0;

            foreach ($asset as $leaf) {

                $many[] = $this->getAssetUrl($leaf, array_replace($options, array(

                    'name' => $options['name'].'_'.$i++,

                )));

            }

        }

        return new TraversableString($one, $many);

    }

    /**

     * Returns an URL for the supplied asset.

     *

     * @param AssetInterface $asset   An asset

     * @param array          $options An array of options

     *

     * @return string An echo-ready URL

     */

    abstract protected function getAssetUrl(AssetInterface $asset, $options = array());

    public function getName()

    {

        return 'assetic';

    }

}