<?php

namespace Drupal\custom_forms\EventSubscriber;

use Drupal\Component\Datetime\TimeInterface;
use Drupal\Core\Logger\LoggerChannelFactoryInterface;
use Drupal\Core\StringTranslation\StringTranslationTrait;
use Drupal\custom_forms\CustomFormItem;
use Drupal\custom_forms\CustomFormItemFactory;
use Drupal\custom_forms\Entity\CustomForm;
use Drupal\entity_clone\Event\EntityCloneEvent;
use Drupal\entity_clone\Event\EntityCloneEvents;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;

/**
 * Class CloneEventSubscriber
 *
 * Event subscriber that handles cloning of custom form items when a custom form
 * is cloned.
 *
 * @package Drupal\custom_forms\EventSubscriber
 */
class CloneEventSubscriber implements EventSubscriberInterface {
  use StringTranslationTrait;

  /**
   * The logger channel factory.
   *
   * @var \Drupal\Core\Logger\LoggerChannelInterface
   */
  protected $logger;

  /**
   * @var \Drupal\Component\Datetime\TimeInterface
   */
  protected $datetime;

  /**
   * The factory in charge of CRUD operations for custom form items.
   *
   * @var \Drupal\custom_forms\CustomFormItemFactory
   */
  protected $itemFactory;

  public function __construct(LoggerChannelFactoryInterface $logger_factory, TimeInterface $datetime, CustomFormItemFactory $item_factory) {
    $this->logger = $logger_factory->get('Custom Forms');
    $this->datetime = $datetime;
    $this->itemFactory = $item_factory;
  }
  /**
   * {@inheritdoc}
   */
  public static function getSubscribedEvents() {
    return [
      EntityCloneEvents::POST_CLONE => 'cloneFormItems',
    ];
  }

  /**
   * Clone the custom form items
   *
   * @param \Drupal\entity_clone\Event\EntityCloneEvent $event
   */
  public function cloneFormItems(EntityCloneEvent $event) {
    // We only want to handle the even for custom form.
    if ($event->getEntity()->getEntityTypeId() !== 'custom_form') {
      return;
    }

    /** @var \Drupal\custom_forms\Entity\CustomForm $original */
    $original = $event->getEntity();
    /** @var \Drupal\custom_forms\Entity\CustomForm $clone */
    $clone = $event->getClonedEntity();

    // If we are missing the original or cloned entities, log an error.
    if ($original === NULL || $clone === NULL) {
      $this->logger->error(
        $this->t('Original or cloned custom form entities are missing, cloning of form fields failed.')
      );
      return;
    }

    $original_items = $this->itemFactory->getFormItems($original, FALSE, TRUE);
    /** @var \Drupal\custom_forms\CustomFormItem $item */
    foreach ($original_items as $item) {
      $this->itemFactory->cloneItem($item, $clone);
    }
  }

}