<?php

/*
 * This file is part of the Sonata project.
 *
 * (c) Thomas Rabaix <thomas.rabaix@sonata-project.org>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Sonata\BlockBundle\Block\Service;

use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\OptionsResolver\OptionsResolverInterface;

use Sonata\AdminBundle\Form\FormMapper;
use Sonata\AdminBundle\Validator\ErrorElement;

use Sonata\BlockBundle\Model\BlockInterface;
use Sonata\BlockBundle\Block\BlockContextInterface;
use Sonata\BlockBundle\Block\BaseBlockService;

/**
 *
 * @author     Thomas Rabaix <thomas.rabaix@sonata-project.org>
 */
class RssBlockService extends BaseBlockService
{
    /**
     * {@inheritdoc}
     */
    public function getName()
    {
        return 'Rss Reader';
    }

    /**
     * {@inheritdoc}
     */
    public function setDefaultSettings(OptionsResolverInterface $resolver)
    {
        $resolver->setDefaults(array(
            'url'      => false,
            'title'    => 'Insert the rss title',
            'template' => 'SonataBlockBundle:Block:block_core_rss.html.twig',
        ));
    }

    /**
     * {@inheritdoc}
     */
    public function buildEditForm(FormMapper $formMapper, BlockInterface $block)
    {
        $formMapper->add('settings', 'sonata_type_immutable_array', array(
            'keys' => array(
                array('url', 'url', array('required' => false)),
                array('title', 'text', array('required' => false)),
            )
        ));
    }

    /**
     * {@inheritdoc}
     */
    public function validateBlock(ErrorElement $errorElement, BlockInterface $block)
    {
        $errorElement
            ->with('settings[url]')
                ->assertNotNull(array())
                ->assertNotBlank()
            ->end()
            ->with('settings[title]')
                ->assertNotNull(array())
                ->assertNotBlank()
                ->assertMaxLength(array('limit' => 50))
            ->end();
    }

    /**
     * {@inheritdoc}
     */
    public function execute(BlockContextInterface $blockContext, Response $response = null)
    {
        // merge settings
        $settings = $blockContext->getSettings();

        $feeds = false;
        if ($settings['url']) {
            $options = array(
                'http' => array(
                    'user_agent' => 'Sonata/RSS Reader',
                    'timeout' => 2,
                )
            );

            // retrieve contents with a specific stream context to avoid php errors
            $content = @file_get_contents($settings['url'], false, stream_context_create($options));

            if ($content) {
                // generate a simple xml element
                try {
                    $feeds = new \SimpleXMLElement($content);
                    $feeds = $feeds->channel->item;
                } catch (\Exception $e) {
                    // silently fail error
                }
            }
        }

        return $this->renderResponse($blockContext->getTemplate(), array(
            'feeds'     => $feeds,
            'block'     => $blockContext->getBlock(),
            'settings'  => $settings
        ), $response);
    }
}
