package com.tourguide.modules.order.service;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.tourguide.modules.operation.service.PlatformSettingsService;
import com.tourguide.modules.order.domain.OrderStatus;
import com.tourguide.modules.order.domain.RefundStatus;
import com.tourguide.modules.order.entity.TourOrder;
import com.tourguide.modules.order.mapper.TourOrderMapper;
import com.tourguide.modules.order.payment.PaymentRefundGateway;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.List;

/** 处理已支付但长时间无人接单的订单自动退款。 */
@Service
public class OrderAutoRefundService {
    private static final Logger log = LoggerFactory.getLogger(OrderAutoRefundService.class);
    private static final int BATCH_SIZE = 100;

    private final TourOrderMapper orderMapper;
    private final PlatformSettingsService platformSettingsService;
    private final PaymentRefundGateway paymentRefundGateway;

    public OrderAutoRefundService(TourOrderMapper orderMapper,
                                  PlatformSettingsService platformSettingsService,
                                  PaymentRefundGateway paymentRefundGateway) {
        this.orderMapper = orderMapper;
        this.platformSettingsService = platformSettingsService;
        this.paymentRefundGateway = paymentRefundGateway;
    }

    @Scheduled(fixedDelayString = "${tourguide.order.auto-refund-scan-delay-millis:10000}")
    @Transactional
    public void refundExpiredUnacceptedOrders() {
        Integer configuredMinutes = platformSettingsService.getSettings().getUnacceptedAutoRefundMinutes();
        int timeoutMinutes = configuredMinutes == null || configuredMinutes < 1 ? 5 : configuredMinutes;
        LocalDateTime expiredBefore = LocalDateTime.now().minusMinutes(timeoutMinutes);
        List<TourOrder> orders = orderMapper.selectList(
                new LambdaQueryWrapper<TourOrder>()
                        .eq(TourOrder::getStatus, OrderStatus.PENDING_ACCEPT.getCode())
                        .isNotNull(TourOrder::getPaymentTime)
                        .le(TourOrder::getPaymentTime, expiredBefore)
                        .and(wrapper -> wrapper.isNull(TourOrder::getRefundStatus)
                                .or().eq(TourOrder::getRefundStatus, RefundStatus.NONE.getCode()))
                        .orderByAsc(TourOrder::getPaymentTime)
                        .last("LIMIT " + BATCH_SIZE));
        for (TourOrder order : orders) {
            refundIfStillUnaccepted(order.getId());
        }
    }

    void refundIfStillUnaccepted(Long orderId) {
        if (orderMapper.claimUnacceptedOrderForRefund(orderId) != 1) {
            return;
        }
        TourOrder order = orderMapper.selectById(orderId);
        BigDecimal refundAmount = order.getPaymentAmount() == null
                ? order.getAmount() : order.getPaymentAmount();
        try {
            String refundOrderNo = paymentRefundGateway.refund(order, refundAmount);
            order.setRefundStatus(RefundStatus.REFUNDED.getCode());
            order.setRefundAmount(refundAmount);
            order.setRefundTime(LocalDateTime.now());
            order.setRefundOrderNo(refundOrderNo);
            order.setRefundMethod(order.getPaymentMethod());
        } catch (RuntimeException exception) {
            order.setRefundStatus(RefundStatus.REFUND_FAILED.getCode());
            log.error("订单自动退款失败，orderId={}, orderNo={}", order.getId(), order.getOrderNo(), exception);
        }
        orderMapper.updateById(order);
    }
}