add service

internal/repository/invite.go

@@ -146,18 +146,27 @@ func (r *inviteRepository) DecrementCanBeUsedCountTx(ctx context.Context, tx pgx
 	query := r.qb.Update("invite_codes").
 		Set("can_be_used_count", sq.Expr("can_be_used_count - 1")).
 		Set("is_active", sq.Expr("CASE WHEN can_be_used_count - 1 <= 0 THEN false ELSE is_active END")).
-		Where(sq.Eq{"code": code})
+		Where(sq.And{
+			sq.Eq{"code": code},
+			sq.Expr("can_be_used_count > 0"),
+			sq.Eq{"is_active": true},
+			sq.Expr("expires_at > now()"),
+		})
 
 	sqlQuery, args, err := query.ToSql()
 	if err != nil {
 		return errs.NewInternalError(errs.DatabaseError, "failed to build query", err)
 	}
 
-	_, err = tx.Exec(ctx, sqlQuery, args...)
+	result, err := tx.Exec(ctx, sqlQuery, args...)
 	if err != nil {
 		return errs.NewInternalError(errs.DatabaseError, "failed to decrement can_be_used_count", err)
 	}
 
+	if result.RowsAffected() == 0 {
+		return errs.NewBusinessError(errs.InviteInvalidOrExpired, "invite code is invalid, expired, or exhausted")
+	}
+
 	return nil
 }