<?php

/*

 * This file is part of the Symfony package.

 *

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

 *

 * For the full copyright and license information, please view the LICENSE

 * file that was distributed with this source code.

 */

namespace Symfony\Bundle\FrameworkBundle\Templating;

use Symfony\Component\Templating\PhpEngine as BasePhpEngine;

use Symfony\Component\Templating\Loader\LoaderInterface;

use Symfony\Component\Templating\TemplateNameParserInterface;

use Symfony\Component\DependencyInjection\ContainerInterface;

use Symfony\Component\HttpFoundation\Response;

/**

 * This engine knows how to render Symfony templates.

 *

 * @author Fabien Potencier <fabien@symfony.com>

 */

class PhpEngine extends BasePhpEngine implements EngineInterface

{

    protected $container;

    /**

     * Constructor.

     *

     * @param TemplateNameParserInterface $parser    A TemplateNameParserInterface instance

     * @param ContainerInterface          $container The DI container

     * @param LoaderInterface             $loader    A loader instance

     * @param GlobalVariables|null        $globals   A GlobalVariables instance or null

     */

    public function __construct(TemplateNameParserInterface $parser, ContainerInterface $container, LoaderInterface $loader, GlobalVariables $globals = null)

    {

        $this->container = $container;

        parent::__construct($parser, $loader);

        if (null !== $globals) {

            $this->addGlobal('app', $globals);

        }

    }

    /**

     * @throws \InvalidArgumentException When the helper is not defined

     */

    public function get($name)

    {

        if (!isset($this->helpers[$name])) {

            throw new \InvalidArgumentException(sprintf('The helper "%s" is not defined.', $name));

        }

        if (is_string($this->helpers[$name])) {

            $this->helpers[$name] = $this->container->get($this->helpers[$name]);

            $this->helpers[$name]->setCharset($this->charset);

        }

        return $this->helpers[$name];

    }

    /**

     * {@inheritdoc}

     */

    public function setHelpers(array $helpers)

    {

        $this->helpers = $helpers;

    }

    /**

     * Renders a view and returns a Response.

     *

     * @param string   $view       The view name

     * @param array    $parameters An array of parameters to pass to the view

     * @param Response $response   A Response instance

     *

     * @return Response A Response instance

     */

    public function renderResponse($view, array $parameters = array(), Response $response = null)

    {

        if (null === $response) {

            $response = new Response();

        }

        $response->setContent($this->render($view, $parameters));

        return $response;

    }

}