121 lines
3.8 KiB
Go
121 lines
3.8 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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// 根治方案：使用唯一索引保证记录不重复
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return s.repo.GetDbW().Exec("INSERT IGNORE 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 支付成功后确认优惠券预扣
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// 新逻辑：优惠券余额已在下单时预扣(status=4)，支付成功后只需确认状态
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// 金额券：status 4 → 2（若余额为0）或保持 4（若还有余额，等后续订单继续使用）
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// 满减/折扣券：status 4 → 2
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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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BalanceAmount int64
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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（包含当前余额）
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_ = readDb.OrderCoupons.WithContext(ctx).UnderlyingDB().Raw(`
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SELECT oc.user_coupon_id AS user_coupon_id,
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oc.applied_amount AS applied_amount,
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uc.status AS status,
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uc.used_order_id AS used_order_id,
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sc.discount_type AS discount_type,
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uc.balance_amount AS balance_amount
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FROM order_coupons oc
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JOIN user_coupons uc ON uc.id=oc.user_coupon_id
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JOIN system_coupons sc ON sc.id=uc.coupon_id
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WHERE oc.order_id=?
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`, orderID).Scan(&rows).Error
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for _, r := range rows {
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// 幂等校验：检查是否已有确认流水
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ledgerExists, _ := readDb.UserCouponLedger.WithContext(ctx).Where(
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readDb.UserCouponLedger.UserCouponID.Eq(r.UserCouponID),
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readDb.UserCouponLedger.OrderID.Eq(orderID),
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readDb.UserCouponLedger.Action.Eq("confirm"),
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).Count()
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if ledgerExists > 0 {
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continue
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}
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// 2. 确认预扣：将 status=4 (预扣中) 更新为最终状态
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if r.DiscountType == 1 { // 金额券
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// 容错：如果券因历史 Bug 仍为 status=4，根据余额修正为正确状态
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if r.Status == 4 {
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finalStatus := int32(1) // 还有余额 → 未使用
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if r.BalanceAmount <= 0 {
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finalStatus = 2 // 余额已扣完 → 已使用
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}
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db.UserCoupons.WithContext(ctx).UnderlyingDB().Exec(
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"UPDATE user_coupons SET status = ? WHERE id = ? AND status = 4",
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finalStatus, r.UserCouponID)
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}
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// 记录确认流水
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ledger := &model.UserCouponLedger{
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UserID: userID,
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UserCouponID: r.UserCouponID,
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ChangeAmount: 0, // 确认操作不改变余额
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BalanceAfter: r.BalanceAmount,
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OrderID: orderID,
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Action: "confirm",
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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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res := db.UserCoupons.WithContext(ctx).UnderlyingDB().Exec(`
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UPDATE user_coupons
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SET status = 2
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WHERE id = ? AND status = 4
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`, r.UserCouponID)
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if res.Error != nil {
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return fmt.Errorf("failed to confirm coupon: %w", res.Error)
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}
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// 记录确认流水
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ledger := &model.UserCouponLedger{
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UserID: userID,
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UserCouponID: r.UserCouponID,
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ChangeAmount: 0,
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BalanceAfter: 0,
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OrderID: orderID,
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Action: "confirm",
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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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