优化判断逻辑

cooleshow-user/user-biz/src/main/java/com/yonge/cooleshow/biz/dal/service/impl/UserPaymentCoreServiceImpl.java

@@ -840,7 +840,8 @@ DISCOUNT("畅学卡")
         }
         // 判断满减
         if (couponInfo.getUseLimit() != null && amount.compareTo(BigDecimal
-                .valueOf(couponInfo.getUseLimit()).setScale(2, BigDecimal.ROUND_HALF_UP)) < 0) {
+                .valueOf(couponInfo.getUseLimit()).setScale(2, BigDecimal.ROUND_HALF_UP)) < 0
+                && !couponAmountMap.isEmpty()) {
             throw new BizException("优惠券不可用");
         }
 
@@ -870,7 +871,7 @@ DISCOUNT("畅学卡")
             userOrderDetail.setActualPrice(actualPrice.subtract(couponAmount));
         }
         if (remainAmount.compareTo(BigDecimal.ZERO) > 0&& amount.compareTo(BigDecimal.ZERO) >0) {
-            UserOrderDetail userOrderDetail = goodsInfos.get(0).getUserOrderDetail();
+            UserOrderDetail userOrderDetail = goodsInfos.get(couponAmountMap.keySet().stream().findFirst().get()).getUserOrderDetail();
             userOrderDetail.setActualPrice(userOrderDetail.getActualPrice().subtract(remainAmount));
 
             userOrderDetail.setDiscountJson(userOrderService.discountJson(EDiscountType.COUPON,