From a7f2a7ac14bc1bab7aab988240cde7f813387e73 Mon Sep 17 00:00:00 2001
From: Jack <46790855@qq.com>
Date: Fri, 31 Oct 2025 08:55:15 +0800
Subject: [PATCH] =?UTF-8?q?=E8=B0=83=E6=95=B4=E4=BA=86=E6=89=93=E7=A5=A8?=
 =?UTF-8?q?=E6=9C=BA=20=E8=AE=A2=E5=8D=95=E5=95=86=E5=93=81=E9=97=B4?=
 =?UTF-8?q?=E8=B7=9D?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../ShopStoreActivityBaseServiceImpl.java     | 31 +++++++++++++++++--
 1 file changed, 28 insertions(+), 3 deletions(-)

diff --git a/mall-shop/src/main/java/com/suisung/mall/shop/store/service/impl/ShopStoreActivityBaseServiceImpl.java b/mall-shop/src/main/java/com/suisung/mall/shop/store/service/impl/ShopStoreActivityBaseServiceImpl.java
index 622ddbbc..3008adcb 100644
--- a/mall-shop/src/main/java/com/suisung/mall/shop/store/service/impl/ShopStoreActivityBaseServiceImpl.java
+++ b/mall-shop/src/main/java/com/suisung/mall/shop/store/service/impl/ShopStoreActivityBaseServiceImpl.java
@@ -3983,43 +3983,68 @@ public class ShopStoreActivityBaseServiceImpl extends BaseServiceImpl<ShopStoreA
         return item_row;
     }
 
+    /**
+     * 计算砍价活动中每次砍价的价格
+     *
+     * @param activity_row 活动基础信息
+     * @param ac_row       砍价活动记录
+     * @return 砍价金额
+     */
     @Override
     public BigDecimal getCutDownPrice(ShopStoreActivityBase activity_row, ShopActivityCutprice ac_row) {
+        // 1. 参数校验
         if (activity_row == null || ac_row == null) {
             throw new ApiException(I18nUtil._("活动不存在！"));
         }
 
+        // 2. 活动类型校验
         Integer activity_type_id = activity_row.getActivity_type_id();
         if (ObjectUtil.notEqual(StateCode.ACTIVITY_TYPE_CUTPRICE, activity_type_id)) {
             throw new ApiException(I18nUtil._("活动不存在！"));
         }
 
-        BigDecimal price = BigDecimal.ZERO;
+        BigDecimal price;
 
+        // 3. 解析活动规则
         String str_activity_rule = activity_row.getActivity_rule();
         JSONObject activity_rule = JSONObject.parseObject(str_activity_rule);
         Integer cut_down_type = activity_rule.getObject("cut_down_type", Integer.class);
         BigDecimal ac_sale_price = ac_row.getAc_sale_price();
         BigDecimal ac_mix_limit_price = ac_row.getAc_mix_limit_price();
 
+        // 4. 根据砍价类型计算砍价金额
         switch (cut_down_type) {
             case 1:
+                // 固定金额砍价
                 price = activity_rule.getObject("cut_down_fixed_price", BigDecimal.class);
                 break;
             case 2:
+                // 随机金额砍价
                 BigDecimal cut_down_min_limit_price = activity_rule.getObject("cut_down_min_limit_price", BigDecimal.class);
                 Integer cut_down_user_num = activity_rule.getObject("cut_down_user_num", Integer.class);
                 Integer ac_num = ac_row.getAc_num();
-                List<Integer> arr = randMoney(NumberUtil.sub(ac_sale_price, cut_down_min_limit_price), cut_down_user_num - ac_num);
 
-                Integer randPrice = arr.size() == 1 ? arr.get(0) : arr.get(RandomUtil.randomInt(0, arr.size() - 1));
+                // 计算剩余可砍价金额和剩余次数
+                List<Integer> arr = randMoney(
+                        NumberUtil.sub(ac_sale_price, cut_down_min_limit_price),
+                        cut_down_user_num - ac_num
+                );
+
+                // 随机选择一个砍价金额
+                Integer randPrice = arr.size() == 1 ? arr.get(0) : arr.get(RandomUtil.randomInt(0, arr.size()));
                 price = NumberUtil.div(BigDecimal.valueOf(randPrice), 100, 2);
                 break;
+            default:
+                // 未知砍价类型，返回0
+                price = BigDecimal.ZERO;
+                break;
         }
 
+        // 5. 返回砍价金额，不超过可砍价的上限
         return NumberUtil.min(NumberUtil.sub(ac_sale_price, ac_mix_limit_price), price);
     }
 
+
     @Override
     public List<ShopStoreActivityBase> getCouponsList(Integer activity_type_id) {
         QueryWrapper<ShopStoreActivityBase> wrapper = new QueryWrapper<>();