<?php
declare(strict_types=1);

namespace Esun\CustomerVat\Observer;

use Magento\Framework\Event\Observer;
use Magento\Framework\Event\ObserverInterface;
use Magento\Quote\Model\Quote;
use Magento\Sales\Model\Order;

class CopyVatContextToOrder implements ObserverInterface
{
    private const FIELDS = ['esun_vat_id', 'esun_vat_number', 'esun_vat_country_id',
        'esun_vat_company_name', 'esun_vat_exempt', 'esun_nominal_tax_rate', 'esun_tax_mode'];

    public function execute(Observer $observer): void
    {
        $quote = $observer->getEvent()->getQuote();
        $order = $observer->getEvent()->getOrder();
        if (!$quote instanceof Quote || !$order instanceof Order) {
            return;
        }
        foreach (self::FIELDS as $field) {
            $order->setData($field, $quote->getData($field));
        }
    }
}