系统砍价逻辑

@@ -296,7 +296,14 @@ public class CutDownPriceServiceImpl implements ICutDownPriceService {
             throw new ServiceException(ServiceError.ACTIVITY_CUTDOWNPRICE_HAS_HELPED_FULL_ERROR);
         }
         // 计算本次应该砍的价格
-        BigDecimal cutPrice = calculateCutPrice(cutDownPriceProductBo, helpUsers);
+        BigDecimal cutPrice = new BigDecimal(0);
+        if(SYSTEM_HELP_ID.equals(helpUserId)){
+            // 系统自动砍价，确保砍价比较多
+            cutPrice = calculateSystemCutPrice(cutDownPriceProductBo);
+        }else{
+            cutPrice = calculateCutPrice(cutDownPriceProductBo, helpUsers);
+        }
+
         CutDownPriceProductHelpUser helpUser = convertCutDownPriceProductHelpUser(cutPriceHelpUserRequestBO);
         helpUser.setCutPrice(cutPrice);
         helpUser.setCreateTime(DateUtils.getCurrentTimeSecond());
@@ -413,6 +420,16 @@ public class CutDownPriceServiceImpl implements ICutDownPriceService {
         return shouldCutPrice;
     }
 
+    private BigDecimal calculateSystemCutPrice(CutDownPriceProductBo cutDownPriceProductBo) {
+        BigDecimal highPrice = cutDownPriceProductBo.getHighPrice();
+        BigDecimal lowPrice = cutDownPriceProductBo.getLowPrice();
+        Integer joinNum = cutDownPriceProductBo.getJoinNum();
+        BigDecimal rangePrice = highPrice.subtract(lowPrice);//价格区间
+        int averagePrice = (int)(rangePrice.floatValue()/joinNum); // 平均砍掉价格
+        BigDecimal randomPrice = new BigDecimal(Math.random()).multiply(new BigDecimal((highPrice.floatValue()-averagePrice-lowPrice.floatValue())/joinNum)).setScale(2, BigDecimal.ROUND_HALF_UP);
+        return new BigDecimal(averagePrice).add(randomPrice);
+    }
+
     private void getUserInfo(Integer userId, List<CutDownPriceProductHelpUserBo> helpUserBos) {
         StringBuilder sb = new StringBuilder();
         sb.append(userId);
@@ -552,5 +569,4 @@ public class CutDownPriceServiceImpl implements ICutDownPriceService {
         redisHashCache.delete(CacheKeyEnum.CUTDOWN_PRICE_MYPRODUCTLIST_INFO.getCacheKey(), userId);
 
     }
-
 }