<?php

namespace Symfony\Component\Templating\Helper;

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien.potencier@symfony-project.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

/**
 * AssetsHelper is the base class for all helper classes that manages assets.
 *
 * Usage:
 *
 * <code>
 *   <img src="<?php echo $view['assets']->getUrl('foo.png') ?>" />
 * </code>
 *
 * @author Fabien Potencier <fabien.potencier@symfony-project.com>
 */
class AssetsHelper extends Helper
{
    protected $version;
    protected $baseURLs;
    protected $basePath;

    /**
     * Constructor.
     *
     * @param string       $basePath The base path
     * @param string|array $baseURLs The domain URL or an array of domain URLs
     * @param string       $version  The version
     */
    public function __construct($basePath = null, $baseURLs = array(), $version = null)
    {
        $this->setBasePath($basePath);
        $this->setBaseURLs($baseURLs);
        $this->version = $version;
    }

    /**
     * Gets the version to add to public URL.
     *
     * @return string The current version
     */
    public function getVersion()
    {
        return $this->version;
    }

    /**
     * Sets the version that is added to each public URL.
     *
     * @param string $id The version
     */
    public function setVersion($version)
    {
        $this->version = $version;
    }

    /**
     * Gets the base path.
     *
     * @return string The base path
     */
    public function getBasePath()
    {
        return $this->basePath;
    }

    /**
     * Sets the base path.
     *
     * @param string $basePath The base path
     */
    public function setBasePath($basePath)
    {
        if (strlen($basePath) && '/' != $basePath[0]) {
            $basePath = '/'.$basePath;
        }

        $this->basePath = rtrim($basePath, '/').'/';
    }

    /**
     * Gets the base URL.
     *
     * If multiple base URLs have been defined a random one will be picked for each asset.
     * In other words: for one asset path the same base URL will always be picked among the available base URLs.
     *
     * @param  string $path The path
     *
     * @return string The base URL
     */
    public function getBaseURL($path)
    {
        $count = count($this->baseURLs);

        if (0 === $count) {
            return '';
        }

        if (1 === $count) {
            return $this->baseURLs[0];
        }

        return $this->baseURLs[fmod(hexdec(substr(md5($path), 0, 10)), $count)];

    }

    /**
     * Gets the base URLs.
     *
     * @return array The base URLs
     */
    public function getBaseURLs()
    {
        return $this->baseURLs;
    }

    /**
     * Sets the base URLs.
     *
     * If you pass an array, the getBaseURL() will return a
     * randomly pick one to use for each asset.
     *
     * @param string|array $baseURLs The base URLs
     */
    public function setBaseURLs($baseURLs)
    {
        if (!is_array($baseURLs)) {
            $baseURLs = array($baseURLs);
        }

        $this->baseURLs = array();
        foreach ($baseURLs as $URL) {
            $this->baseURLs[] = rtrim($URL, '/');
        }
    }

    /**
     * Returns the public path.
     *
     * @param string $path A public path
     *
     * @return string A public path which takes into account the base path and URL path
     */
    public function getUrl($path)
    {
        if (false !== strpos($path, '://')) {
            return $path;
        }

        $base = $this->getBaseURL($path);
        if (0 !== strpos($path, '/')) {
            $path = $base ? '/'.$path : $this->basePath.$path;
        }

        return $base.$path.($this->version ? '?'.$this->version : '');
    }

    /**
     * Returns the canonical name of this helper.
     *
     * @return string The canonical name
     */
    public function getName()
    {
        return 'assets';
    }
}