<?php

declare(strict_types=1);

namespace paygw_moneta\local\callback;

use core\lock\lock_config;
use core_payment\helper;
use paygw_moneta\local\BuyerNotifier;
use paygw_moneta\local\CmsInfo;
use paygw_moneta\local\ErrorLogLogger;
use paygw_moneta\local\GatewayConfig;
use paygw_moneta\local\GatewayConfigRepository;
use paygw_moneta\local\Logger;
use paygw_moneta\local\Money;
use paygw_moneta\local\order\CurrentPrice;
use paygw_moneta\local\order\Order;
use paygw_moneta\local\order\RejectionReason;
use paygw_moneta\local\order\TransactionRepository;
use paygw_moneta\local\protocol\AssistantTransactionId;
use paygw_moneta\local\protocol\CallbackNotification;
use paygw_moneta\local\protocol\CallbackResponse;
use paygw_moneta\local\protocol\CheckResponse;
use paygw_moneta\local\protocol\ResultCode;

/**
 * @package paygw_moneta
 * @copyright 2026 Moneta Labs {@link https://moneta.ru/}
 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
final class CallbackHandler
{
    private const LOCK_TIMEOUT = 10;

    private readonly NotificationHandler $check;
    private readonly NotificationHandler $pay;

    /**
     * @param \Closure(string, string, int, int, int): bool|null $deliverOrder
     */
    public function __construct(
        private readonly TransactionRepository $repository = new TransactionRepository(),
        ?\Closure $deliverOrder = null,
        BuyerNotifier $notifier = new BuyerNotifier(),
        private readonly Logger $logger = new ErrorLogLogger(),
        private readonly GatewayConfigRepository $configs = new GatewayConfigRepository(),
        CurrentPrice $currentPrice = new CurrentPrice(),
    ) {
        $this->check = new CheckHandler($repository);
        $this->pay = new PayHandler(
            repository: $repository,
            deliverOrder: $deliverOrder ?? helper::deliver_order(...),
            notifier: $notifier,
            currentPrice: $currentPrice,
            logger: $logger,
        );
    }

    /**
     * @param array<string, mixed> $fields
     */
    public function handle(array $fields): CallbackResponse
    {
        try {
            $notification = new CallbackNotification($fields);
        } catch (\InvalidArgumentException) {
            return CallbackResponse::fail();
        }

        $merchantOrderId = AssistantTransactionId::parse($notification->getTransactionId());
        if ($merchantOrderId === null) {
            return CallbackResponse::fail();
        }

        $order = $this->repository->findByMerchantOrderId($merchantOrderId);
        if ($order === null) {
            return $this->unknownOrder($notification);
        }

        $config = $this->configs->forAccount($order->accountId);
        if ($config === null || !$config->isComplete()) {
            return CallbackResponse::fail();
        }

        if (
            $notification->getAccountId() !== $config->accountNumber
            || $notification->getAccountId() !== $order->snapshot->accountNumber
            || !$notification->isSignedBy($config->signature())
        ) {
            $this->logger->error('Уведомление отклонено: подпись или номер счёта не совпадают.');

            return CallbackResponse::fail();
        }

        $lock = lock_config::get_lock_factory('paygw_moneta')->get_lock($order->merchantOrderId, self::LOCK_TIMEOUT);
        if (!$lock) {
            return CallbackResponse::fail();
        }
        try {
            $order = $this->repository->findById($order->id) ?? $order;

            return $this->handleSigned($notification, $order, $config);
        } finally {
            $lock->release();
        }
    }

    private function handleSigned(CallbackNotification $notification, Order $order, GatewayConfig $config): CallbackResponse
    {
        $error = $this->validate($notification, $order);
        if ($error !== null) {
            $this->repository->noteError($order, $error);

            return CallbackResponse::fail();
        }

        $handler = $notification->isCheck() ? $this->check : $this->pay;

        return $handler->handle($notification, $order, $config);
    }

    private function validate(CallbackNotification $notification, Order $order): ?RejectionReason
    {
        if ($notification->getCurrency() !== $order->currency) {
            return RejectionReason::Currency;
        }

        if ($notification->isTestMode() !== $order->snapshot->testMode) {
            return RejectionReason::TestMode;
        }

        if ($notification->getSubscriberId() !== '' && $notification->getSubscriberId() !== $order->subscriberId()) {
            return RejectionReason::Subscriber;
        }

        $amount = $notification->getAmount();
        if ($amount !== null && !$amount->equals($order->amount)) {
            return RejectionReason::Amount;
        }

        return null;
    }

    private function unknownOrder(CallbackNotification $notification): CallbackResponse
    {
        $config = $this->configs->findByAccountNumber($notification->getAccountId());
        if ($config === null || !$notification->isSignedBy($config->signature())) {
            return CallbackResponse::fail();
        }

        if (!$notification->isCheck()) {
            $this->logger->error(
                sprintf(
                    'Оплачено уведомление по неизвестному заказу %s (операция %s).',
                    $notification->getTransactionId(),
                    $notification->getOperationId(),
                ),
            );

            return CallbackResponse::fail();
        }

        $response = new CheckResponse(
            accountId: $config->accountNumber,
            transactionId: $notification->getTransactionId(),
            amount: $notification->getAmount() ?? Money::fromMinorUnits(0),
            resultCode: ResultCode::Rejected,
            signature: $config->signature(),
            cms: CmsInfo::getCmsModuleVersion(),
        );

        return $response->toXml();
    }
}