前后端：商品确认页，增加优惠劵接入

后端：修改了价格计算的逻辑

promotion/promotion-service-api/src/main/java/cn/iocoder/mall/promotion/api/CouponService.java

@@ -2,13 +2,12 @@ package cn.iocoder.mall.promotion.api;
 
 import cn.iocoder.common.framework.validator.InEnum;
 import cn.iocoder.common.framework.vo.CommonResult;
-import cn.iocoder.mall.promotion.api.bo.CouponCardBO;
-import cn.iocoder.mall.promotion.api.bo.CouponCardPageBO;
-import cn.iocoder.mall.promotion.api.bo.CouponTemplateBO;
-import cn.iocoder.mall.promotion.api.bo.CouponTemplatePageBO;
+import cn.iocoder.mall.promotion.api.bo.*;
 import cn.iocoder.mall.promotion.api.constant.CouponTemplateStatusEnum;
 import cn.iocoder.mall.promotion.api.dto.*;
 
+import java.util.List;
+
 public interface CouponService {
 
     // ========== 优惠劵（码）模板 ==========
@@ -93,6 +92,17 @@ public interface CouponService {
      */
     CommonResult<Boolean> cancelUseCouponCard(Integer userId, Integer couponCardId);
 
+    /**
+     * 获得用户所有优惠劵，并标明是否可用
+     *
+     * 注意，spus 是作为条件，判断优惠劵是否可用
+     *
+     * @param userId 用户编号
+     * @param spus 匹配的商品/分类
+     * @return 优惠劵列表
+     */
+    CommonResult<List<CouponCardAvailableBO>> getCouponCardList(Integer userId, List<CouponCardSpuDTO> spus);
+
     // ========== 优惠码 ==========
 
     /**

promotion/promotion-service-api/src/main/java/cn/iocoder/mall/promotion/api/bo/CouponCardAvailableBO.java

@@ -0,0 +1,24 @@
+package cn.iocoder.mall.promotion.api.bo;
+
+import lombok.Data;
+import lombok.experimental.Accessors;
+
+/**
+ * 可用优惠劵 BO
+ *
+ * 注意，如果优惠劵不可用，标记 available = false ，并写明 unavailableReason 原因
+ */
+@Data
+@Accessors(chain = true)
+public class CouponCardAvailableBO extends CouponCardBO {
+
+    /**
+     * 是否可用
+     */
+    private Boolean available;
+    /**
+     * 不可用原因
+     */
+    private String unavailableReason;
+
+}

promotion/promotion-service-api/src/main/java/cn/iocoder/mall/promotion/api/dto/CouponCardSpuDTO.java

@@ -0,0 +1,39 @@
+package cn.iocoder.mall.promotion.api.dto;
+
+import lombok.Data;
+import lombok.experimental.Accessors;
+
+import java.io.Serializable;
+import java.util.List;
+
+/**
+ * 优惠劵商品 DTO
+ *
+ * 主要用于 {@link cn.iocoder.mall.promotion.api.CouponService#getCouponCardList(Integer, List)}
+ */
+@Data
+@Accessors(chain = true)
+public class CouponCardSpuDTO implements Serializable {
+
+    /**
+     * 商品 SPU 编号
+     */
+    private Integer spuId;
+    /**
+     * 商品 SKU 编号
+     */
+    private Integer skuId;
+    /**
+     * 分类编号
+     */
+    private Integer categoryId;
+    /**
+     * 价格
+     */
+    private Integer price;
+    /**
+     * 数量
+     */
+    private Integer quantity;
+
+}

promotion/promotion-service-impl/src/main/java/cn/iocoder/mall/promotion/biz/convert/CouponCardConvert.java

@@ -1,5 +1,6 @@
 package cn.iocoder.mall.promotion.biz.convert;
 
+import cn.iocoder.mall.promotion.api.bo.CouponCardAvailableBO;
 import cn.iocoder.mall.promotion.api.bo.CouponCardBO;
 import cn.iocoder.mall.promotion.biz.dataobject.CouponCardDO;
 import org.mapstruct.Mapper;
@@ -22,4 +23,7 @@ public interface CouponCardConvert {
     @Mappings({})
     CouponCardBO convert(CouponCardDO card);
 
+    @Mappings({})
+    CouponCardAvailableBO convert2(CouponCardDO card,  boolean x); // TODO 芋艿，临时用来解决 mapstruct 无法正确匹配方法的问题
+
 }

promotion/promotion-service-impl/src/main/java/cn/iocoder/mall/promotion/biz/dao/CouponCardMapper.java

@@ -11,6 +11,9 @@ public interface CouponCardMapper {
 
     CouponCardDO selectById(@Param("id") Integer id);
 
+    List<CouponCardDO> selectListByUserIdAndStatus(@Param("userId") Integer userId,
+                                                   @Param("status") Integer status);
+
     List<CouponCardDO> selectListByPage(@Param("userId") Integer userId,
                                         @Param("status") Integer status,
                                         @Param("offset") Integer offset,

promotion/promotion-service-impl/src/main/java/cn/iocoder/mall/promotion/biz/dao/CouponTemplateMapper.java

@@ -4,6 +4,7 @@ import cn.iocoder.mall.promotion.biz.dataobject.CouponTemplateDO;
 import org.apache.ibatis.annotations.Param;
 import org.springframework.stereotype.Repository;
 
+import java.util.Collection;
 import java.util.List;
 
 @Repository
@@ -11,6 +12,8 @@ public interface CouponTemplateMapper {
 
     CouponTemplateDO selectById(@Param("id") Integer id);
 
+    List<CouponTemplateDO> selectListByIds(@Param("ids") Collection<Integer> ids);
+
     List<CouponTemplateDO> selectListByPage(@Param("type") Integer type,
                                             @Param("title") String title,
                                             @Param("status") Integer status,

promotion/promotion-service-impl/src/main/java/cn/iocoder/mall/promotion/biz/package-info.java

@@ -1 +0,0 @@
-package cn.iocoder.mall.promotion.biz;

promotion/promotion-service-impl/src/main/java/cn/iocoder/mall/promotion/biz/service/CouponServiceImpl.java

@@ -3,12 +3,10 @@ package cn.iocoder.mall.promotion.biz.service;
 import cn.iocoder.common.framework.constant.SysErrorCodeEnum;
 import cn.iocoder.common.framework.util.DateUtil;
 import cn.iocoder.common.framework.util.ServiceExceptionUtil;
+import cn.iocoder.common.framework.util.StringUtil;
 import cn.iocoder.common.framework.vo.CommonResult;
 import cn.iocoder.mall.promotion.api.CouponService;
-import cn.iocoder.mall.promotion.api.bo.CouponCardBO;
-import cn.iocoder.mall.promotion.api.bo.CouponCardPageBO;
-import cn.iocoder.mall.promotion.api.bo.CouponTemplateBO;
-import cn.iocoder.mall.promotion.api.bo.CouponTemplatePageBO;
+import cn.iocoder.mall.promotion.api.bo.*;
 import cn.iocoder.mall.promotion.api.constant.*;
 import cn.iocoder.mall.promotion.api.dto.*;
 import cn.iocoder.mall.promotion.biz.convert.CouponCardConvert;
@@ -22,8 +20,8 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
-import java.util.Calendar;
-import java.util.Date;
+import java.util.*;
+import java.util.stream.Collectors;
 
 @Service // 实际上不用添加。添加的原因是，必须 Spring 报错提示
 @com.alibaba.dubbo.config.annotation.Service(validation = "true")
@@ -252,6 +250,23 @@ public class CouponServiceImpl implements CouponService {
         return null;
     }
 
+    @Override
+    public CommonResult<List<CouponCardAvailableBO>> getCouponCardList(Integer userId, List<CouponCardSpuDTO> spus) {
+        // 查询用户未使用的优惠劵列表
+        List<CouponCardDO> cards = couponCardMapper.selectListByUserIdAndStatus(userId, CouponCardStatusEnum.UNUSED.getValue());
+        Map<Integer, CouponTemplateDO> templates = couponTemplateMapper.selectListByIds(cards.stream().map(CouponCardDO::getTemplateId).collect(Collectors.toSet()))
+                .stream().collect(Collectors.toMap(CouponTemplateDO::getId, template -> template));
+        // 逐个判断是否可用
+        List<CouponCardAvailableBO> availableCards = cards.stream().map(card -> {
+            CouponCardAvailableBO availableCard = CouponCardConvert.INSTANCE.convert2(card, true);
+            availableCard.setUnavailableReason(isMatch(card, templates.get(card.getTemplateId()), spus));
+            availableCard.setAvailable(availableCard.getUnavailableReason() == null);
+            return availableCard;
+        }).collect(Collectors.toList());
+        // 返回结果
+        return CommonResult.success(availableCards);
+    }
+
     private void setCouponCardValidTime(CouponCardDO card, CouponTemplateDO template) {
         if (CouponTemplateDateTypeEnum.FIXED_DATE.getValue().equals(template.getDateType())) {
             card.setValidStartTime(template.getValidStartTime()).setValidEndTime(template.getValidEndTime());
@@ -263,6 +278,35 @@ public class CouponServiceImpl implements CouponService {
         }
     }
 
+    // 如果匹配，则返回 null 即可。
+    private String isMatch(CouponCardDO card, CouponTemplateDO template, List<CouponCardSpuDTO> spus) {
+        int totalPrice = 0;
+        if (RangeTypeEnum.ALL.getValue().equals(template.getRangeType())) {
+            totalPrice = spus.stream().mapToInt(spu -> spu.getPrice() * spu.getQuantity()).sum();
+        } else if (RangeTypeEnum.PRODUCT_INCLUDE_PART.getValue().equals(template.getRangeType())) {
+            List<Integer> spuIds = StringUtil.splitToInt(template.getRangeValues(), ",");
+            totalPrice = spus.stream().mapToInt(spu -> spuIds.contains(spu.getSpuId()) ? spu.getPrice() * spu.getQuantity() : 0).sum();
+        } else if (RangeTypeEnum.PRODUCT_EXCLUDE_PART.getValue().equals(template.getRangeType())) {
+            List<Integer> spuIds = StringUtil.splitToInt(template.getRangeValues(), ",");
+            totalPrice = spus.stream().mapToInt(spu -> !spuIds.contains(spu.getSpuId()) ? spu.getPrice() * spu.getQuantity() : 0).sum();
+        } else if (RangeTypeEnum.CATEGORY_INCLUDE_PART.getValue().equals(template.getRangeType())) {
+            List<Integer> spuIds = StringUtil.splitToInt(template.getRangeValues(), ",");
+            totalPrice = spus.stream().mapToInt(spu -> spuIds.contains(spu.getCategoryId()) ? spu.getPrice() * spu.getQuantity() : 0).sum();
+        } else if (RangeTypeEnum.CATEGORY_EXCLUDE_PART.getValue().equals(template.getRangeType())) {
+            List<Integer> spuIds = StringUtil.splitToInt(template.getRangeValues(), ",");
+            totalPrice = spus.stream().mapToInt(spu -> !spuIds.contains(spu.getCategoryId()) ? spu.getPrice() * spu.getQuantity() : 0).sum();
+        }
+        // 总价为 0 时，说明优惠劵丫根不匹配
+        if (totalPrice == 0) {
+            return "优惠劵不匹配";
+        }
+        // 如果不满足金额
+        if (totalPrice < card.getPriceAvailable()) {
+            return String.format("差 %1$,.2f 元可用优惠劵", (card.getPriceAvailable() - totalPrice) / 100D);
+        }
+        return null;
+    }
+
     // ========== 优惠码 ==========
 
     @Override

promotion/promotion-service-impl/src/main/resources/mapper/CouponCardMapper.xml

@@ -33,6 +33,20 @@
         WHERE id = #{id}
     </select>
 
+    <select id="selectListByUserIdAndStatus" resultType="CouponCardDO">
+        SELECT
+            <include refid="FIELDS" />
+        FROM coupon_card
+        <where>
+            <if test="userId != null">
+                AND user_id = #{userId}
+            </if>
+            <if test="status != null">
+                AND status = #{status}
+            </if>
+        </where>
+    </select>
+
     <select id="selectListByPage" resultType="CouponCardDO">
         SELECT
           <include refid="FIELDS" />

promotion/promotion-service-impl/src/main/resources/mapper/CouponTemplateMapper.xml

@@ -34,6 +34,16 @@
         WHERE id = #{id}
     </select>
 
+    <select id="selectListByIds" resultType="CouponTemplateDO">
+        SELECT
+            <include refid="FIELDS"/>
+        FROM coupon_template
+        WHERE id IN
+        <foreach item="id" collection="ids" separator="," open="(" close=")" index="">
+            #{id}
+        </foreach>
+    </select>
+
     <select id="selectListByPage" resultType="CouponTemplateDO">
         SELECT
           <include refid="FIELDS" />

promotion/promotion-service-impl/src/test/java/cn/iocoder/mall/promotion/biz/package-info.java

@@ -1 +0,0 @@
-package cn.iocoder.mall.promotion.biz;