// this one has the problem that it always clears the default data and completed replaces it with default data
class RestoreInputOrderTypeExtension extends AbstractTypeExtension {

	public function buildForm(FormBuilderInterface $builder, array $options) {
		if(!$options['restore_input_order'] || !$options['compound']) {
			return;
		}

		$builder->addEventListener(FormEvents::PRE_SUBMIT, function(FormEvent $fe) {
			$data = $fe->getData();

			if($data === null) {
				return;
			}

			if(!is_array($data)) {
				throw new TransformationFailedException('expected array', 1);
			}

			$form = $fe->getForm();
			foreach(array_keys($data) as $name) {
				if($form->has($name)) {
					$child = $form->get($name);
					$form->remove($name);
					$form->add($child);
				}
			}
		}, -100);

		$builder->addEventListener(FormEvents::SUBMIT, function(FormEvent $fe) {
			$data = $fe->getData();

			if($data === null) {
				return;
			}

			if(!is_array($data)) {
				throw new TransformationFailedException('expected array', 1);
			}

			$orderedData = array();
			foreach(array_keys($fe->getForm()->all()) as $name) {
				$orderedData[$name] = $data[$name];
			}

			$fe->setData($orderedData);

		}, -100);
	}

	/**
	 * @see \Symfony\Component\Form\AbstractTypeExtension::setDefaultOptions()
	 */
	public function setDefaultOptions(OptionsResolverInterface $resolver) {
		$resolver->setDefaults(array(
			'restore_input_order' => false,
		));
	}

	/**
	 * @see \Symfony\Component\Form\FormTypeExtensionInterface::getExtendedType()
	 */
	public function getExtendedType() {
		return 'form';
	}

}

class RestoreCheckboxInputOrderListener implements EventSubscriberInterface {

	private $inputData;

	private $choiceList;

	public function __construct(ChoiceListInterface $choiceList) {
		$this->choiceList = $choiceList;
	}

	public function preSubmit(FormEvent $event) {
		$this->inputData = $event->getData();
	}

	public function submit(FormEvent $event) {
		$data = array();
		foreach($this->choiceList->getChoicesForValues($this->inputData) as $inputChoice) {
			foreach($event->getData() as $i => $choice) {
				if($choice === $inputChoice) {
					$data[$i] = $choice;
				}
			}
		}
		$event->setData($data);
	}

	public static function getSubscribedEvents() {
		return array(
			FormEvents::PRE_SUBMIT => array('preSubmit', 100),
			FormEvents::SUBMIT => 'submit'
		);
	}

}