115 lines
3.5 KiB
Go
115 lines
3.5 KiB
Go
package user
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import (
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"bindbox-game/internal/repository/mysql/dao"
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"bindbox-game/internal/repository/mysql/model"
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"context"
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"fmt"
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"time"
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)
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// RecordOrderCouponUsage 记录订单使用的用户券与本次抵扣金额
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func (s *service) RecordOrderCouponUsage(ctx context.Context, orderID int64, userCouponID int64, appliedAmount int64) error {
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if orderID <= 0 || userCouponID <= 0 || appliedAmount <= 0 {
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return nil
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}
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return s.repo.GetDbW().Exec("INSERT INTO order_coupons (order_id, user_coupon_id, applied_amount, created_at) VALUES (?,?,?,NOW(3))", orderID, userCouponID, appliedAmount).Error
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}
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// DeductCouponsForPaidOrder 支付成功后扣减金额券余额或核销一次性券
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func (s *service) DeductCouponsForPaidOrder(ctx context.Context, tx *dao.Query, userID int64, orderID int64, paidAt time.Time) error {
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type row struct {
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UserCouponID int64
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AppliedAmount int64
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Status int32
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UsedOrderID int64
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DiscountType int32
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}
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var rows []row
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// 确定使用的数据库查询对象
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db := s.writeDB
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if tx != nil {
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db = tx
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}
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readDb := s.readDB
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if tx != nil {
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readDb = tx
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}
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// 1. 获取该订单关联的所有优惠券使用记录
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_ = readDb.OrderCoupons.WithContext(ctx).UnderlyingDB().Raw("SELECT oc.user_coupon_id AS user_coupon_id, oc.applied_amount AS applied_amount, uc.status AS status, uc.used_order_id AS used_order_id, sc.discount_type AS discount_type FROM order_coupons oc JOIN user_coupons uc ON uc.id=oc.user_coupon_id JOIN system_coupons sc ON sc.id=uc.coupon_id WHERE oc.order_id=?", orderID).Scan(&rows).Error
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for _, r := range rows {
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// 幂等校验：已核销且绑定本订单，则跳过
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if r.Status == 2 && r.UsedOrderID == orderID {
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continue
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}
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var currentBal int64
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var ucUserID int64
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uc, err := readDb.UserCoupons.WithContext(ctx).Where(readDb.UserCoupons.ID.Eq(r.UserCouponID)).First()
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if err != nil || uc == nil {
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continue // 或记录日志
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}
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currentBal = uc.BalanceAmount
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ucUserID = uc.UserID
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if r.DiscountType == 1 { // 金额券：按量扣减
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nb := currentBal - r.AppliedAmount
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if nb < 0 {
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nb = 0
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}
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upd := map[string]any{
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"balance_amount": nb,
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"used_order_id": orderID,
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"used_at": paidAt,
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}
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if nb == 0 {
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upd["status"] = 2 // 余额扣完，标记为已完成
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}
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_, err = db.UserCoupons.WithContext(ctx).Where(db.UserCoupons.ID.Eq(r.UserCouponID)).Updates(upd)
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if err != nil {
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return fmt.Errorf("failed to update user coupon balance: %w", err)
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}
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// 记录账变流水
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ledger := &model.UserCouponLedger{
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UserID: ucUserID,
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UserCouponID: r.UserCouponID,
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ChangeAmount: -r.AppliedAmount,
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BalanceAfter: nb,
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OrderID: orderID,
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Action: "apply",
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CreatedAt: time.Now(),
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}
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_ = db.UserCouponLedger.WithContext(ctx).Create(ledger)
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} else { // 满减/折扣券：一次性核销
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_, err = db.UserCoupons.WithContext(ctx).Where(db.UserCoupons.ID.Eq(r.UserCouponID)).Updates(map[string]any{
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"status": 2,
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"used_order_id": orderID,
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"used_at": paidAt,
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})
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if err != nil {
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return fmt.Errorf("failed to verify user coupon: %w", err)
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}
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// 记录账变流水
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ledger := &model.UserCouponLedger{
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UserID: ucUserID,
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UserCouponID: r.UserCouponID,
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ChangeAmount: -r.AppliedAmount,
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BalanceAfter: 0,
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OrderID: orderID,
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Action: "apply",
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CreatedAt: time.Now(),
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}
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_ = db.UserCouponLedger.WithContext(ctx).Create(ledger)
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}
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}
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return nil
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}
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