package com.ruoyi.system.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.ruoyi.common.exception.ServiceException;
import com.ruoyi.system.dto.RefundApplyDTO;
import com.ruoyi.system.enums.BigGiftPackageOrderStatusEnum;
import com.ruoyi.system.model.TAppUser;
import com.ruoyi.system.model.TBigGiftPackage;
import com.ruoyi.system.model.TBigGiftPackageOrder;
import com.ruoyi.system.model.TRefundApplication;
import com.ruoyi.system.mapper.TRefundApplicationMapper;
import com.ruoyi.system.query.BigGiftPackageQuery;
import com.ruoyi.system.query.RefundApplicationQuery;
import com.ruoyi.system.service.TAppUserService;
import com.ruoyi.system.service.TBigGiftPackageOrderService;
import com.ruoyi.system.service.TBigGiftPackageService;
import com.ruoyi.system.service.TRefundApplicationService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.ruoyi.system.vo.TRefundApplicationVo;
import lombok.RequiredArgsConstructor;
import org.springframework.context.annotation.Lazy;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

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

/**
 * <p>
 * 退款申请 服务实现类
 * </p>
 *
 * @author xiaochen
 * @since 2025-12-08
 */
@Service
@RequiredArgsConstructor(onConstructor_ = @Lazy)
public class TRefundApplicationServiceImpl extends ServiceImpl<TRefundApplicationMapper, TRefundApplication> implements TRefundApplicationService {

    private final TBigGiftPackageOrderService tBigGiftPackageOrderService;
    private final TAppUserService tAppUserService;
    private final TBigGiftPackageService tBigGiftPackageService;

    @Override
    public Page<TBigGiftPackageOrder> pageRefundList(RefundApplicationQuery query) {
        Page<TBigGiftPackageOrder> page = new Page<>(query.getPageNum(), query.getPageSize());
        return this.baseMapper.pageRefundList(page, query);
    }

    @Override
    public List<TBigGiftPackageOrder> pageRefundExportList(BigGiftPackageQuery query) {
        return  this.baseMapper.pageRefundExportList(query);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void applyRefund(RefundApplyDTO dto, Integer userId) {
        // 校验订单是否存在
        TBigGiftPackageOrder order = tBigGiftPackageOrderService.getById(dto.getOrderId());
        if (order == null) {
            throw new ServiceException("订单不存在");
        }

        // 校验订单状态：只有已付订金、完成支付、确认收货的订单可以申请退款
        Integer status = order.getStatus();
        boolean canApplyRefund = status.equals(BigGiftPackageOrderStatusEnum.DEPOSIT_PAID.getCode())
                || status.equals(BigGiftPackageOrderStatusEnum.PAID.getCode())
                || status.equals(BigGiftPackageOrderStatusEnum.CONFIRM_RECEIPT.getCode());
        if (!canApplyRefund) {
            throw new ServiceException("当前订单状态不支持退款申请");
        }

        // 校验是否已存在待审核的退款申请
        long pendingCount = this.count(new LambdaQueryWrapper<TRefundApplication>()
                .eq(TRefundApplication::getBigGiftPackageOrderId, dto.getOrderId())
                .eq(TRefundApplication::getStatus, 1)
                .eq(TRefundApplication::getDelFlag, 0));
        if (pendingCount > 0) {
            throw new ServiceException("该订单已存在待审核的退款申请");
        }

        // 创建退款申请记录
        TRefundApplication refundApplication = new TRefundApplication();
        refundApplication.setBigGiftPackageOrderId(dto.getOrderId());
        refundApplication.setApplicantUserId(userId);
        refundApplication.setApplicantTime(LocalDateTime.now());
        refundApplication.setRefundReason(dto.getRefundReason());
        refundApplication.setVoucherPicture(dto.getVoucherPicture());
        refundApplication.setStatus(1); // 待审核
        refundApplication.setDelFlag(0);
        this.save(refundApplication);
    }

    @Override
    public TRefundApplicationVo refundDetail(Integer id) {
        TRefundApplication refundApplication = this.getById(id);
        TRefundApplicationVo vo = new TRefundApplicationVo();
        vo.setId(refundApplication.getId());
        vo.setBigGiftPackageOrderId(refundApplication.getBigGiftPackageOrderId());

        // 订单信息
        TBigGiftPackageOrder order = tBigGiftPackageOrderService.getById(refundApplication.getBigGiftPackageOrderId());
        vo.setCode(order.getCode());
        vo.setCreateTime(order.getCreateTime());
        vo.setOrderPrice(order.getOrderPrice());

        // 用户信息
        TAppUser appUser = tAppUserService.getById(order.getAppUserId());
        vo.setUserName(appUser.getName());
        vo.setPhone(appUser.getPhone());


        // 商品信息
        TBigGiftPackage tBigGiftPackage = tBigGiftPackageService.getById(order.getBigGiftPackageId());
        vo.setBigGiftPackageName(tBigGiftPackage.getName());
        vo.setBigGiftPackageCover(tBigGiftPackage.getCoverImage());
        vo.setBigGiftPackagePrice(tBigGiftPackage.getTotalPrice());
        vo.setBigGiftPackageIntro(tBigGiftPackage.getIntroduction());

        // 销量
        long count = tBigGiftPackageOrderService.count(new LambdaQueryWrapper<TBigGiftPackageOrder>().eq(TBigGiftPackageOrder::getBigGiftPackageId, order.getBigGiftPackageId()).ne(TBigGiftPackageOrder::getStatus, 5));
        vo.setBigGiftPackageSales((int)count);

        // 支付信息
        vo.setStatus(order.getStatus());
        vo.setOrderAmount(order.getOrderPrice());
        vo.setFinalPayment(order.getFinalPayment());
        vo.setPaidTime(order.getFinalPaymentTime());
        vo.setRemark(order.getRemark());

        // 退款信息
        vo.setRefundReason(refundApplication.getRefundReason());
        vo.setVoucherPicture(refundApplication.getVoucherPicture());
        vo.setRefundStatus(refundApplication.getStatus());

        // 审核信息
        vo.setAuditRemark(refundApplication.getAuditRemark());
        vo.setAuditTime(refundApplication.getAuditTime());
        return vo;
    }
}