trade：价格计算时，接入优惠劵逻辑

yudao-module-mall/yudao-module-trade-biz/src/main/java/cn/iocoder/yudao/module/trade/controller/app/order/vo/AppTradeOrderSettlementRespVO.java

@@ -14,7 +14,7 @@ import java.util.List;
 public class AppTradeOrderSettlementRespVO {
 
     @Schema(description = "交易类型", requiredMode = Schema.RequiredMode.REQUIRED, example = "1") // 对应 TradeOrderTypeEnum 枚举
-    private Integer type = 1; // TODO 芋艿：改成计算
+    private Integer type;
 
     @Schema(description = "购物项数组", requiredMode = Schema.RequiredMode.REQUIRED)
     private List<Item> items;
@@ -75,6 +75,9 @@ public class AppTradeOrderSettlementRespVO {
         @Schema(description = "商品原价（总），单位：分", requiredMode = Schema.RequiredMode.REQUIRED, example = "500")
         private Integer totalPrice;
 
+        @Schema(description = "订单优惠（总），单位：分", requiredMode = Schema.RequiredMode.REQUIRED, example = "66")
+        private Integer discountPrice;
+
         @Schema(description = "运费金额，单位：分", requiredMode = Schema.RequiredMode.REQUIRED, example = "50")
         private Integer deliveryPrice;
 

yudao-module-mall/yudao-module-trade-biz/src/main/java/cn/iocoder/yudao/module/trade/convert/order/TradeOrderConvert.java

@@ -211,7 +211,8 @@ public interface TradeOrderConvert {
                 .setCouponId(settlementReqVO.getCouponId()).setPointStatus(settlementReqVO.getPointStatus())
                 .setDeliveryType(settlementReqVO.getDeliveryType()).setAddressId(settlementReqVO.getAddressId())
                 .setPickUpStoreId(settlementReqVO.getPickUpStoreId())
-                .setItems(new ArrayList<>(settlementReqVO.getItems().size()));
+                .setItems(new ArrayList<>(settlementReqVO.getItems().size()))
+                .setSeckillActivityId(settlementReqVO.getSeckillActivityId());
         // 商品项的构建
         Map<Long, CartDO> cartMap = convertMap(cartList, CartDO::getId);
         for (AppTradeOrderSettlementReqVO.Item item : settlementReqVO.getItems()) {

yudao-module-mall/yudao-module-trade-biz/src/main/java/cn/iocoder/yudao/module/trade/dal/dataobject/order/TradeOrderDO.java

@@ -288,4 +288,11 @@ public class TradeOrderDO extends BaseDO {
      */
     private Integer vipPrice;
 
+    /**
+     * 秒杀活动编号
+     *
+     * 关联 SeckillActivityDO 的 id 字段
+     */
+    private Long seckillActivityId;
+
 }

yudao-module-mall/yudao-module-trade-biz/src/main/java/cn/iocoder/yudao/module/trade/dal/mysql/order/TradeOrderItemMapper.java

@@ -1,13 +1,19 @@
 package cn.iocoder.yudao.module.trade.dal.mysql.order;
 
+import cn.hutool.core.collection.CollUtil;
+import cn.hutool.core.map.MapUtil;
 import cn.iocoder.yudao.framework.mybatis.core.mapper.BaseMapperX;
 import cn.iocoder.yudao.framework.mybatis.core.query.LambdaQueryWrapperX;
 import cn.iocoder.yudao.module.trade.dal.dataobject.order.TradeOrderItemDO;
+import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
 import com.baomidou.mybatisplus.core.conditions.update.LambdaUpdateWrapper;
 import org.apache.ibatis.annotations.Mapper;
+import org.apache.ibatis.annotations.Param;
 
 import java.util.Collection;
 import java.util.List;
+import java.util.Map;
+import java.util.Set;
 
 @Mapper
 public interface TradeOrderItemMapper extends BaseMapperX<TradeOrderItemDO> {
@@ -38,4 +44,13 @@ public interface TradeOrderItemMapper extends BaseMapperX<TradeOrderItemDO> {
                 .eq(TradeOrderItemDO::getCommentStatus, commentStatus));
     }
 
+    default int selectProductSumByOrderId(@Param("orderIds") Set<Long> orderIds) {
+        // SQL sum 查询
+        List<Map<String, Object>> result = selectMaps(new QueryWrapper<TradeOrderItemDO>()
+                .select("SUM(count) AS sumCount")
+                .in("order_id", orderIds)); // 只计算选中的
+        // 获得数量
+        return CollUtil.getFirst(result) != null ? MapUtil.getInt(result.get(0), "sumCount") : 0;
+    }
+
 }

yudao-module-mall/yudao-module-trade-biz/src/main/java/cn/iocoder/yudao/module/trade/dal/mysql/order/TradeOrderMapper.java

@@ -82,4 +82,10 @@ public interface TradeOrderMapper extends BaseMapperX<TradeOrderDO> {
                 .eq(TradeOrderDO::getCommentStatus, commentStatus));
     }
 
+    default List<TradeOrderDO> selectListByUserIdAndSeckillActivityId(Long userId, Long seckillActivityId) {
+        return selectList(new LambdaUpdateWrapper<>(TradeOrderDO.class)
+                .eq(TradeOrderDO::getUserId, userId)
+                .eq(TradeOrderDO::getSeckillActivityId, seckillActivityId));
+    }
+
 }

yudao-module-mall/yudao-module-trade-biz/src/main/java/cn/iocoder/yudao/module/trade/service/order/TradeOrderQueryService.java

@@ -82,6 +82,15 @@ public interface TradeOrderQueryService {
      */
     List<ExpressTrackRespDTO> getExpressTrackList(Long id);
 
+    /**
+     * 【会员】在指定秒杀活动下，用户购买的商品数量
+     *
+     * @param userId 用户编号
+     * @param activityId 活动编号
+     * @return 秒杀商品数量
+     */
+    int getSeckillProductCount(Long userId, Long activityId);
+
     // =================== Order Item ===================
 
     /**

yudao-module-mall/yudao-module-trade-biz/src/main/java/cn/iocoder/yudao/module/trade/service/order/TradeOrderQueryServiceImpl.java

@@ -13,6 +13,7 @@ import cn.iocoder.yudao.module.trade.dal.dataobject.order.TradeOrderDO;
 import cn.iocoder.yudao.module.trade.dal.dataobject.order.TradeOrderItemDO;
 import cn.iocoder.yudao.module.trade.dal.mysql.order.TradeOrderItemMapper;
 import cn.iocoder.yudao.module.trade.dal.mysql.order.TradeOrderMapper;
+import cn.iocoder.yudao.module.trade.enums.order.TradeOrderStatusEnum;
 import cn.iocoder.yudao.module.trade.framework.delivery.core.client.ExpressClientFactory;
 import cn.iocoder.yudao.module.trade.framework.delivery.core.client.dto.ExpressTrackQueryReqDTO;
 import cn.iocoder.yudao.module.trade.framework.delivery.core.client.dto.ExpressTrackRespDTO;
@@ -120,6 +121,18 @@ public class TradeOrderQueryServiceImpl implements TradeOrderQueryService {
         return getExpressTrackList(order);
     }
 
+    @Override
+    public int getSeckillProductCount(Long userId, Long activityId) {
+        // 获得订单列表
+        List<TradeOrderDO> orders = tradeOrderMapper.selectListByUserIdAndSeckillActivityId(userId, activityId);
+        orders.removeIf(order -> TradeOrderStatusEnum.isCanceled(order.getStatus())); // 过滤掉【已取消】的订单
+        if (CollUtil.isEmpty(orders)) {
+            return 0;
+        }
+        // 获得订单项列表
+        return tradeOrderItemMapper.selectProductSumByOrderId(convertSet(orders, TradeOrderDO::getId));
+    }
+
     // TODO @puhui999：可以加个 spring 缓存，30 分钟；主要考虑及时性要求不高，但是每次调用需要钱；
     /**
      * 获得订单的物流轨迹

yudao-module-mall/yudao-module-trade-biz/src/main/java/cn/iocoder/yudao/module/trade/service/price/calculator/TradeSeckillActivityPriceCalculator.java

@@ -1,19 +1,22 @@
 package cn.iocoder.yudao.module.trade.service.price.calculator;
 
+import cn.hutool.core.lang.Assert;
+import cn.hutool.core.util.StrUtil;
 import cn.iocoder.yudao.module.promotion.api.seckill.SeckillActivityApi;
-import cn.iocoder.yudao.module.promotion.api.seckill.dto.SeckillActivityProductRespDTO;
+import cn.iocoder.yudao.module.promotion.api.seckill.dto.SeckillValidateJoinRespDTO;
+import cn.iocoder.yudao.module.promotion.enums.common.PromotionTypeEnum;
+import cn.iocoder.yudao.module.trade.service.order.TradeOrderQueryService;
 import cn.iocoder.yudao.module.trade.service.price.bo.TradePriceCalculateReqBO;
 import cn.iocoder.yudao.module.trade.service.price.bo.TradePriceCalculateRespBO;
 import org.springframework.core.annotation.Order;
 import org.springframework.stereotype.Component;
 
 import javax.annotation.Resource;
-import java.util.List;
-import java.util.Map;
 
-import static cn.iocoder.yudao.framework.common.util.collection.CollectionUtils.convertMap;
-import static cn.iocoder.yudao.framework.common.util.collection.CollectionUtils.convertSet;
+import static cn.iocoder.yudao.framework.common.exception.util.ServiceExceptionUtil.exception;
+import static cn.iocoder.yudao.module.trade.enums.ErrorCodeConstants.PRICE_CALCULATE_SECKILL_TOTAL_LIMIT_COUNT;
 
+// TODO huihui：单测需要补充
 /**
  * 秒杀活动的 {@link TradePriceCalculator} 实现类
  *
@@ -24,22 +27,45 @@ import static cn.iocoder.yudao.framework.common.util.collection.CollectionUtils.
 public class TradeSeckillActivityPriceCalculator implements TradePriceCalculator {
 
     @Resource
-    private SeckillActivityApi activityApi;
+    private SeckillActivityApi seckillActivityApi;
+
+    @Resource
+    private TradeOrderQueryService tradeOrderQueryService;
 
     @Override
     public void calculate(TradePriceCalculateReqBO param, TradePriceCalculateRespBO result) {
-        // 1、判断订单类型和是否具有秒杀活动编号
+        // 1. 判断订单类型和是否具有秒杀活动编号
         if (param.getSeckillActivityId() == null) {
             return;
         }
-        // 2、获取秒杀活动商品信息
-        List<SeckillActivityProductRespDTO> productList = activityApi.getSeckillActivityProductList(param.getSeckillActivityId(), convertSet(param.getItems(),
-                TradePriceCalculateReqBO.Item::getSkuId));
-        Map<Long, SeckillActivityProductRespDTO> productMap = convertMap(productList, SeckillActivityProductRespDTO::getSkuId);
-        result.getItems().forEach(item -> {
-            SeckillActivityProductRespDTO product = productMap.get(item.getSkuId());
-            item.setActivityPrice(product.getSeckillPrice()); // 设置活动金额
-        });
+        Assert.isTrue(param.getItems().size() == 1, "秒杀时，只允许选择一个商品");
+        // 2. 校验是否可以参与秒杀
+        TradePriceCalculateRespBO.OrderItem orderItem = result.getItems().get(0);
+        SeckillValidateJoinRespDTO seckillActivity = validateJoinSeckill(
+                param.getUserId(), param.getSeckillActivityId(),
+                orderItem.getSkuId(), orderItem.getCount());
+
+        // 3.1 记录优惠明细
+        Integer discountPrice = orderItem.getPayPrice() - seckillActivity.getSeckillPrice();
+        TradePriceCalculatorHelper.addPromotion(result, orderItem,
+                param.getSeckillActivityId(), seckillActivity.getName(), PromotionTypeEnum.SECKILL_ACTIVITY.getType(),
+                StrUtil.format("秒杀活动：省 {} 元", TradePriceCalculatorHelper.formatPrice(discountPrice)),
+                discountPrice);
+        // 3.2 更新 SKU 优惠金额
+        orderItem.setDiscountPrice(orderItem.getDiscountPrice() + discountPrice);
+        TradePriceCalculatorHelper.recountPayPrice(orderItem);
+        TradePriceCalculatorHelper.recountAllPrice(result);
+    }
+
+    private SeckillValidateJoinRespDTO validateJoinSeckill(Long userId, Long activityId, Long skuId, Integer count) {
+        // 1. 校验是否可以参与秒杀
+        SeckillValidateJoinRespDTO seckillActivity = seckillActivityApi.validateJoinSeckill(activityId, skuId, count);
+        // 2. 校验总限购数量，目前只有 trade 有具体下单的数据，需要交给 trade 价格计算使用
+        int seckillProductCount = tradeOrderQueryService.getSeckillProductCount(userId, activityId);
+        if (seckillProductCount + count > seckillActivity.getTotalLimitCount()) {
+            throw exception(PRICE_CALCULATE_SECKILL_TOTAL_LIMIT_COUNT);
+        }
+        return seckillActivity;
     }
 
 }