package pay

import (
	"context"
	"database/sql"
	"net/http"
	"qnc-server/app/main/api/internal/svc"
	"qnc-server/app/main/model"
	"strings"
	"time"

	"github.com/pkg/errors"
	"github.com/wechatpay-apiv3/wechatpay-go/services/refunddomestic"
	"github.com/zeromicro/go-zero/core/logx"
	"github.com/zeromicro/go-zero/core/stores/sqlx"
)

type WechatPayRefundCallbackLogic struct {
	logx.Logger
	ctx    context.Context
	svcCtx *svc.ServiceContext
}

func NewWechatPayRefundCallbackLogic(ctx context.Context, svcCtx *svc.ServiceContext) *WechatPayRefundCallbackLogic {
	return &WechatPayRefundCallbackLogic{
		Logger: logx.WithContext(ctx),
		ctx:    ctx,
		svcCtx: svcCtx,
	}
}

// handleQueryOrderRefund 处理查询订单退款
func (l *WechatPayRefundCallbackLogic) handleQueryOrderRefund(orderNo string, status refunddomestic.Status) error {
	logx.Infof("【退款回调】开始处理查询订单退款，orderNo: %s, status: %v", orderNo, status)

	order, err := l.svcCtx.OrderModel.FindOneByOrderNo(l.ctx, orderNo)
	if err != nil {
		logx.Errorf("【退款回调】查找查询订单信息失败: orderNo=%s, err=%v", orderNo, err)
		return errors.Wrapf(err, "查找查询订单信息失败: %s", orderNo)
	}
	logx.Infof("【退款回调】查找到订单信息: orderId=%d, currentStatus=%s", order.Id, order.Status)

	// 只处理成功和失败状态
	var orderStatus, refundStatus string
	switch status {
	case refunddomestic.STATUS_SUCCESS:
		orderStatus = model.OrderStatusRefunded
		refundStatus = model.OrderRefundStatusSuccess
		logx.Infof("【退款回调】退款成功，将更新订单状态为: %s, 退款记录状态为: %s", orderStatus, refundStatus)
	case refunddomestic.STATUS_CLOSED:
		// 退款关闭，保持订单原状态，更新退款记录为失败
		refundStatus = model.OrderRefundStatusFailed
		logx.Infof("【退款回调】退款关闭，退款记录状态将更新为: %s", refundStatus)
	case refunddomestic.STATUS_ABNORMAL:
		// 退款异常，保持订单原状态，更新退款记录为失败
		refundStatus = model.OrderRefundStatusFailed
		logx.Infof("【退款回调】退款异常，退款记录状态将更新为: %s", refundStatus)
	default:
		// 其他状态暂不处理
		logx.Infof("【退款回调】状态 %v 暂不处理，直接返回", status)
		return nil
	}

	logx.Infof("【退款回调】开始执行数据库事务更新")
	// 使用事务同时更新订单和退款记录
	err = l.svcCtx.OrderModel.Trans(l.ctx, func(ctx context.Context, session sqlx.Session) error {
		logx.Infof("【退款回调】进入事务处理")

		// 更新订单状态（仅在退款成功时更新）
		if status == refunddomestic.STATUS_SUCCESS {
			logx.Infof("【退款回调】准备更新订单状态，orderId: %d", order.Id)
			order.Status = orderStatus
			order.RefundTime = sql.NullTime{
				Time:  time.Now(),
				Valid: true,
			}
			if err := l.svcCtx.OrderModel.UpdateWithVersion(ctx, session, order); err != nil {
				logx.Errorf("【退款回调】更新订单状态失败: orderId=%d, err=%v", order.Id, err)
				return errors.Wrapf(err, "更新查询订单状态失败: %s", orderNo)
			}
			logx.Infof("【退款回调】订单状态更新成功，orderId: %d", order.Id)
		}

		// 更新退款记录状态
		logx.Infof("【退款回调】准备查找退款记录，orderId: %d", order.Id)
		refund, err := l.svcCtx.OrderRefundModel.FindOneByOrderId(ctx, order.Id)
		if err != nil {
			if err == model.ErrNotFound {
				logx.Errorf("【退款回调】未找到订单对应的退款记录: orderNo=%s, orderId=%d", orderNo, order.Id)
				return nil // 没有退款记录时不报错，只记录警告
			}
			logx.Errorf("【退款回调】查找退款记录失败: orderNo=%s, orderId=%d, err=%v", orderNo, order.Id, err)
			return errors.Wrapf(err, "查找退款记录失败: orderNo=%s", orderNo)
		}
		logx.Infof("【退款回调】找到退款记录: refundId=%d, currentStatus=%s", refund.Id, refund.Status)

		refund.Status = refundStatus
		if status == refunddomestic.STATUS_SUCCESS {
			refund.RefundTime = sql.NullTime{
				Time:  time.Now(),
				Valid: true,
			}
			logx.Infof("【退款回调】设置退款成功时间")
		} else if status == refunddomestic.STATUS_CLOSED {
			refund.CloseTime = sql.NullTime{
				Time:  time.Now(),
				Valid: true,
			}
			logx.Infof("【退款回调】设置退款关闭时间")
		}

		logx.Infof("【退款回调】准备更新退款记录状态，refundId: %d", refund.Id)
		if _, err := l.svcCtx.OrderRefundModel.Update(ctx, session, refund); err != nil {
			logx.Errorf("【退款回调】更新退款记录状态失败: refundId=%d, err=%v", refund.Id, err)
			return errors.Wrapf(err, "更新退款记录状态失败: orderNo=%s", orderNo)
		}
		logx.Infof("【退款回调】退款记录状态更新成功，refundId: %d", refund.Id)

		logx.Infof("【退款回调】事务处理完成")
		return nil
	})

	if err != nil {
		logx.Errorf("【退款回调】事务执行失败: orderNo=%s, err=%v", orderNo, err)
		return errors.Wrapf(err, "更新订单和退款记录失败: %s", orderNo)
	}

	logx.Infof("【退款回调】查询订单退款处理完成，orderNo: %s", orderNo)
	return nil
}

// handleAgentOrderRefund 处理代理会员订单退款
func (l *WechatPayRefundCallbackLogic) handleAgentOrderRefund(orderNo string, status refunddomestic.Status) error {
	logx.Infof("【退款回调】开始处理代理会员订单退款，orderNo: %s, status: %v", orderNo, status)

	order, err := l.svcCtx.AgentMembershipRechargeOrderModel.FindOneByOrderNo(l.ctx, orderNo)
	if err != nil {
		logx.Errorf("【退款回调】查找代理会员订单信息失败: orderNo=%s, err=%v", orderNo, err)
		return errors.Wrapf(err, "查找代理会员订单信息失败: %s", orderNo)
	}
	logx.Infof("【退款回调】找到代理会员订单: orderId=%d, currentStatus=%s", order.Id, order.Status)

	if status == refunddomestic.STATUS_SUCCESS {
		logx.Infof("【退款回调】代理会员订单退款成功，将更新状态为: refunded")
		order.Status = "refunded"
	} else if status == refunddomestic.STATUS_ABNORMAL {
		logx.Infof("【退款回调】代理会员订单退款异常状态，直接返回")
		return nil // 异常状态直接返回
	} else {
		logx.Infof("【退款回调】代理会员订单其他状态 %v，直接返回", status)
		return nil // 其他状态直接返回
	}

	logx.Infof("【退款回调】准备更新代理会员订单状态，orderId: %d", order.Id)
	if err := l.svcCtx.AgentMembershipRechargeOrderModel.UpdateWithVersion(l.ctx, nil, order); err != nil {
		logx.Errorf("【退款回调】更新代理会员订单状态失败: orderId=%d, err=%v", order.Id, err)
		return errors.Wrapf(err, "更新代理会员订单状态失败: %s", orderNo)
	}

	logx.Infof("【退款回调】代理会员订单退款处理完成，orderNo: %s", orderNo)
	return nil
}

// sendSuccessResponse 发送成功响应
func (l *WechatPayRefundCallbackLogic) sendSuccessResponse(w http.ResponseWriter) {
	logx.Infof("【退款回调】发送成功响应给微信")
	w.WriteHeader(http.StatusOK)
	_, _ = w.Write([]byte("success"))
}

func (l *WechatPayRefundCallbackLogic) WechatPayRefundCallback(w http.ResponseWriter, r *http.Request) error {
	logx.Infof("【退款回调】收到微信退款回调请求")

	// 1. 处理微信退款通知
	logx.Infof("【退款回调】开始解析微信退款通知")
	notification, err := l.svcCtx.WechatPayService.HandleRefundNotification(l.ctx, r)
	if err != nil {
		logx.Errorf("【退款回调】微信退款回调处理失败: %v", err)
		l.sendSuccessResponse(w)
		return nil
	}

	logx.Infof("【退款回调】微信退款通知解析成功")
	logx.Infof("【退款回调】notification详细信息: %+v", notification)

	// 2. 检查关键字段是否为空
	if notification.OutTradeNo == nil {
		logx.Errorf("【退款回调】OutTradeNo字段为空")
		l.sendSuccessResponse(w)
		return nil
	}

	orderNo := *notification.OutTradeNo
	logx.Infof("【退款回调】提取到订单号: %s", orderNo)

	// 3. 判断退款状态，优先使用Status，如果Status为nil则使用SuccessTime判断
	var status refunddomestic.Status
	var statusDetermined bool = false

	if notification.Status != nil {
		status = *notification.Status
		statusDetermined = true
		logx.Infof("【退款回调】从Status字段获取状态: %v", status)
	} else if notification.SuccessTime != nil && !notification.SuccessTime.IsZero() {
		// 如果Status为空但SuccessTime有值，说明退款成功
		status = refunddomestic.STATUS_SUCCESS
		statusDetermined = true
		logx.Infof("【退款回调】Status为空，但SuccessTime有值(%v)，判断为退款成功", notification.SuccessTime)
	} else {
		logx.Errorf("【退款回调】Status和SuccessTime都为空，无法确定退款状态")
		l.sendSuccessResponse(w)
		return nil
	}

	if !statusDetermined {
		logx.Errorf("【退款回调】无法确定退款状态")
		l.sendSuccessResponse(w)
		return nil
	}

	logx.Infof("【退款回调】最终确定状态: %v", status)
	var processErr error

	// 4. 根据订单号前缀处理不同类型的订单
	logx.Infof("【退款回调】开始根据订单号前缀分发处理")
	switch {
	case strings.HasPrefix(orderNo, "Q_"):
		logx.Infof("【退款回调】识别为查询订单，orderNo: %s", orderNo)
		processErr = l.handleQueryOrderRefund(orderNo, status)
	case strings.HasPrefix(orderNo, "A_"):
		logx.Infof("【退款回调】识别为代理会员订单，orderNo: %s", orderNo)
		processErr = l.handleAgentOrderRefund(orderNo, status)
	default:
		// 兼容旧订单，假设没有前缀的是查询订单
		logx.Infof("【退款回调】无前缀订单，按查询订单处理，orderNo: %s", orderNo)
		processErr = l.handleQueryOrderRefund(orderNo, status)
	}

	// 5. 处理错误并响应
	if processErr != nil {
		logx.Errorf("【退款回调】处理退款订单失败: orderNo=%s, err=%v", orderNo, processErr)
	} else {
		logx.Infof("【退款回调】处理退款订单成功: orderNo=%s", orderNo)
	}

	// 无论处理是否成功，都返回成功响应给微信
	l.sendSuccessResponse(w)
	logx.Infof("【退款回调】退款回调处理完成")
	return nil
}