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<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
declare(strict_types=1);

namespace Magento\Sales\Observer;

use Magento\Customer\Api\Data\CustomerInterface;
use Magento\Framework\Event\Observer;
use Magento\Framework\Event\ObserverInterface;
use Magento\Sales\Api\OrderRepositoryInterface;
use Magento\Sales\Model\Order\CustomerAssignment;

/**
 * Assign order to customer created after issuing guest order.
 */
class AssignOrderToCustomerObserver implements ObserverInterface
{
    /**
     * @var OrderRepositoryInterface
     */
    private $orderRepository;

    /**
     * @var CustomerAssignment
     */
    private $assignmentService;

    /**
     * AssignOrderToCustomerObserver constructor.
     *
     * @param OrderRepositoryInterface $orderRepository
     * @param CustomerAssignment $assignmentService
     */
    public function __construct(
        OrderRepositoryInterface $orderRepository,
        CustomerAssignment $assignmentService
    ) {
        $this->orderRepository = $orderRepository;
        $this->assignmentService = $assignmentService;
    }

    /**
     * @inheritdoc
     */
    public function execute(Observer $observer)
    {
        $event = $observer->getEvent();
        /** @var CustomerInterface $customer */
        $customer = $event->getData('customer_data_object');
        /** @var array $delegateData */
        $delegateData = $event->getData('delegate_data');
        if (array_key_exists('__sales_assign_order_id', $delegateData)) {
            $orderId = $delegateData['__sales_assign_order_id'];
            $order = $this->orderRepository->get($orderId);
            if (!$order->getCustomerId() && $customer->getId()) {
                $this->assignmentService->execute($order, $customer);
            }
        }
    }
}