修复(#75): 适配促销数量与永久订阅判定

Co-authored-by: multica-agent <github@multica.ai>

internal/logic/common/promoEligibility.go

@@ -11,6 +11,7 @@ import (
 	"github.com/perfect-panel/server/pkg/xerr"
 	"github.com/pkg/errors"
 	"gorm.io/gorm"
+	"gorm.io/gorm/clause"
 )
 
 type PromoResult struct {
@@ -27,13 +28,13 @@ type promoRuleParams struct {
 	InactiveMonths int `json:"inactive_months"`
 }
 
-func EvaluatePromo(ctx context.Context, svcCtx *svc.ServiceContext, userID int64, subscribeID int64) (*PromoResult, error) {
+func EvaluatePromo(ctx context.Context, svcCtx *svc.ServiceContext, userID int64, subscribeID int64, quantity int64) (*PromoResult, error) {
 	result := &PromoResult{}
-	if svcCtx == nil || svcCtx.PromoModel == nil || svcCtx.DB == nil || userID <= 0 || subscribeID <= 0 {
+	if svcCtx == nil || svcCtx.PromoModel == nil || svcCtx.DB == nil || userID <= 0 || subscribeID <= 0 || quantity <= 0 {
 		return result, nil
 	}
 
-	rules, err := svcCtx.PromoModel.QueryEligibleRules(ctx, subscribeID)
+	rules, err := svcCtx.PromoModel.QueryEligibleRules(ctx, subscribeID, quantity)
 	if err != nil {
 		return nil, errors.Wrapf(xerr.NewErrCode(xerr.DatabaseQueryError), "query promo rules failed: %v", err.Error())
 	}
@@ -148,7 +149,12 @@ func evaluateInactiveUserPromo(
 	err := db.WithContext(ctx).
 		Model(&user.Subscribe{}).
 		Where("user_id = ?", userID).
-		Order("expire_time DESC").
+		Order(clause.OrderBy{
+			Expression: clause.Expr{
+				SQL:  "CASE WHEN expire_time = ? THEN 0 ELSE 1 END, expire_time DESC",
+				Vars: []interface{}{time.UnixMilli(0)},
+			},
+		}).
 		Limit(1).
 		Take(&lastSub).Error
 	if err != nil {