<?php

namespace Trinity\Bundle\NewsletterBundle\Form\EventListener;

use Symfony\Component\Form\FormEvent;
use Symfony\Component\Form\FormEvents;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;

class AddBlockFieldsSubscriber implements EventSubscriberInterface
{
    public static function getSubscribedEvents()
    {
        return array(FormEvents::PRE_SET_DATA => 'preSetData');
    }

    public function preSetData(FormEvent $event)
    {
        $data = $event->getData();
        $form = $event->getForm();

        if ($data && $data->getId()) {
            foreach ($data->getConfiguration()->getBlocks() as $block_configuration) {
                $type = $block_configuration->getType();

                $form->add(
                    sprintf('block_%s', $block_configuration->getName()),
                    new $type(),
                    array(
                        'attr' => array(
                            'class' => 'embeded-form',
                        ),
                    )
                );
            }
        }
    }
}