package com.tourguide.modules.finance.service;

import com.tourguide.common.exception.BusinessException;
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 org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

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

/** 将到期且未分账的订单收益幂等计入导游余额。 */
@Service
public class GuideBalanceSettlementService {
    private final TourOrderMapper orderMapper;
    private final GuideWithdrawableBalanceService balanceService;

    public GuideBalanceSettlementService(TourOrderMapper orderMapper,
                                         GuideWithdrawableBalanceService balanceService) {
        this.orderMapper = orderMapper;
        this.balanceService = balanceService;
    }

    @Transactional
    public boolean settle(Long orderId, LocalDateTime settledAt) {
        TourOrder order = orderMapper.selectForUpdate(orderId);
        if (!canSettle(order, settledAt)) return false;

        BigDecimal earning = order.getGuideEarningAmount();
        if (earning.signum() > 0) {
            balanceService.credit(order.getGuideId(), earning);
        }
        order.setSettledAt(settledAt);
        if (orderMapper.updateById(order) != 1) {
            throw new BusinessException(500, "订单分账状态更新失败");
        }
        return true;
    }

    private boolean canSettle(TourOrder order, LocalDateTime now) {
        return order != null
                && OrderStatus.COMPLETED.matches(order.getStatus())
                && order.getSettledAt() == null
                && order.getSettlementDueAt() != null
                && !order.getSettlementDueAt().isAfter(now)
                && order.getGuideId() != null
                && order.getGuideEarningAmount() != null
                && order.getGuideEarningAmount().signum() >= 0
                && !RefundStatus.REFUNDED.matches(order.getRefundStatus());
    }
}