fix: 折扣金额修复

eladmin-system/src/main/java/cn/ysk/cashier/service/impl/shopimpl/TbShopTableServiceImpl.java

@@ -1337,11 +1337,20 @@ public class TbShopTableServiceImpl implements TbShopTableService {
             outRecords.add(tbActivateOutRecord);
             cashierCart.setUseCouponInfo(JSONObject.toJSONString(tbActivateOutRecord));
 
-            couponVo.setFinalDiscountAmount(discountAmount);
             // 优惠券未消耗完毕
             if (balanceCart != null && getCanUseCoupon(couponMap, balanceCart.getProductId()) != null) {
-                discountAmount = reduceProCoupon(couponMap, balanceCart, usedCouponMap, discountAmount, balanceCartList, outRecords, memberId);
+                // 递归调用并累加递归返回的折扣金额
+                discountAmount = discountAmount.add(reduceProCoupon(
+                        couponMap,
+                        balanceCart,
+                        usedCouponMap,
+                        BigDecimal.ZERO, // 避免重复累加，递归时传入新的初始值
+                        balanceCartList,
+                        outRecords,
+                        memberId
+                ));
             }
+            couponVo.setFinalDiscountAmount(discountAmount);
             return discountAmount;
         }
         return discountAmount;