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<?php

declare(strict_types=1);

namespace Mautic\FormBundle\EventListener;

use Mautic\FormBundle\Event\FormEvent;
use Mautic\FormBundle\FormEvents;
use Mautic\FormBundle\Model\FieldModel;
use Mautic\FormBundle\Model\FormModel;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;

final class FormConditionalSubscriber implements EventSubscriberInterface
{
    public function __construct(
        private FormModel $formModel,
        private FieldModel $fieldModel
    ) {
    }

    public static function getSubscribedEvents(): array
    {
        return [
            FormEvents::FORM_POST_SAVE => ['onFormPostSave', 0],
        ];
    }

    /**
     * Replace session field Id with field Id after save entity.
     */
    public function onFormPostSave(FormEvent $event): void
    {
        $form = $event->getForm();

        // Process temporary field ID to real field ID
        $actualFieldIds = [];
        foreach ($form->getFields() as $field) {
            $actualFieldIds[] = $field->getId();
            if (str_contains((string) $field->getParent(), 'new')) {
                foreach ($form->getFields() as $parentField) {
                    if ($field->getParent() === $parentField->getSessionId()) {
                        $field->setParent((string) $parentField->getId());
                        $this->fieldModel->saveEntity($field);
                    }
                }
            }
        }

        // Delete child fields
        $deleteIds = [];
        foreach ($form->getFields() as $field) {
            if ($field->getParent() && !in_array($field->getParent(), $actualFieldIds)) {
                $deleteIds[] = $field->getId();
            }
        }

        if (!empty($deleteIds)) {
            $this->formModel->deleteFields($form, $deleteIds);
        }
    }
}