refactor(pricing): 优化优惠券配置实体和领取逻辑

- 将时间字段类型从 LocalDateTime 改为 Date
- 为优惠券领取数量更新添加无条件增加方法
- 区分有限量和无限量优惠券的领取处理逻辑
- 实现有总量限制优惠券的库存检查机制
- 统一更新已领取数量的计数逻辑

src/main/java/com/ycwl/basic/pricing/dto/resp/SceneCouponAvailableResp.java

@@ -3,7 +3,7 @@ package com.ycwl.basic.pricing.dto.resp;
 import lombok.Data;
 
 import java.math.BigDecimal;
-import java.time.LocalDateTime;
+import java.util.Date;
 
 /**
  * 场景下可领取优惠券响应
@@ -44,12 +44,12 @@ public class SceneCouponAvailableResp {
     /**
      * 有效期起始
      */
-    private LocalDateTime validFrom;
+    private Date validFrom;
 
     /**
      * 有效期结束
      */
-    private LocalDateTime validUntil;
+    private Date validUntil;
 
     /**
      * 用户可领取数量限制（每人最多可领，null或0表示无限制）

src/main/java/com/ycwl/basic/pricing/dto/resp/SceneCouponConfigResp.java

@@ -3,7 +3,6 @@ package com.ycwl.basic.pricing.dto.resp;
 import lombok.Data;
 
 import java.math.BigDecimal;
-import java.time.LocalDateTime;
 import java.util.Date;
 
 /**
@@ -55,10 +54,10 @@ public class SceneCouponConfigResp {
     /**
      * 优惠券有效期起始
      */
-    private LocalDateTime couponValidFrom;
+    private Date couponValidFrom;
 
     /**
      * 优惠券有效期结束
      */
-    private LocalDateTime couponValidUntil;
+    private Date couponValidUntil;
 }

src/main/java/com/ycwl/basic/pricing/entity/PriceCouponConfig.java

@@ -8,7 +8,6 @@ import com.ycwl.basic.pricing.enums.CouponType;
 import lombok.Data;
 
 import java.math.BigDecimal;
-import java.time.LocalDateTime;
 import java.util.Date;
 
 /**
@@ -80,12 +79,12 @@ public class PriceCouponConfig {
     /**
      * 生效时间
      */
-    private LocalDateTime validFrom;
+    private Date validFrom;
 
     /**
      * 失效时间
      */
-    private LocalDateTime validUntil;
+    private Date validUntil;
     
     /**
      * 是否启用

src/main/java/com/ycwl/basic/pricing/mapper/PriceCouponConfigMapper.java

@@ -40,13 +40,20 @@ public interface PriceCouponConfigMapper extends BaseMapper<PriceCouponConfig> {
     int incrementUsedQuantity(Long couponId);
 
     /**
-     * 原子性增加已领取数量（仅对有限库存的优惠券生效）
+     * 原子性增加已领取数量（仅对有限库存的优惠券生效，带库存检查）
      */
     @Update("UPDATE price_coupon_config SET claimed_quantity = COALESCE(claimed_quantity, 0) + 1, " +
             "update_time = NOW() WHERE id = #{couponId} AND total_quantity IS NOT NULL AND total_quantity > 0 " +
             "AND COALESCE(claimed_quantity, 0) < total_quantity")
     int incrementClaimedQuantityIfAvailable(@Param("couponId") Long couponId);
 
+    /**
+     * 无条件增加已领取数量（用于无限量优惠券的领取统计）
+     */
+    @Update("UPDATE price_coupon_config SET claimed_quantity = COALESCE(claimed_quantity, 0) + 1, " +
+            "update_time = NOW() WHERE id = #{couponId}")
+    int incrementClaimedQuantity(@Param("couponId") Long couponId);
+    
     /**
      * 插入优惠券配置
      */

src/main/java/com/ycwl/basic/pricing/service/impl/CouponServiceImpl.java

@@ -23,7 +23,6 @@ import org.springframework.transaction.interceptor.TransactionAspectSupport;
 
 import java.math.BigDecimal;
 import java.math.RoundingMode;
-import java.time.LocalDateTime;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -316,11 +315,11 @@ public class CouponServiceImpl implements ICouponService {
             }
             
             // 4. 检查优惠券有效期
-            LocalDateTime now = LocalDateTime.now();
+            Date now = new Date();
-            if (coupon.getValidFrom() != null && now.isBefore(coupon.getValidFrom())) {
+            if (coupon.getValidFrom() != null && now.before(coupon.getValidFrom())) {
                 return CouponClaimResult.failure(CouponClaimResult.ERROR_COUPON_EXPIRED, "优惠券尚未生效");
             }
-            if (coupon.getValidUntil() != null && now.isAfter(coupon.getValidUntil())) {
+            if (coupon.getValidUntil() != null && now.after(coupon.getValidUntil())) {
                 return CouponClaimResult.failure(CouponClaimResult.ERROR_COUPON_EXPIRED, "优惠券已过期");
             }
             
@@ -366,17 +365,20 @@ public class CouponServiceImpl implements ICouponService {
             }
 
             // 9. 更新优惠券已领取数量（区分于已使用数量）
-            // 仅在有总量限制时才更新claimedQuantity(totalQuantity为正整数)
             if (coupon.getTotalQuantity() != null && coupon.getTotalQuantity() > 0) {
+                // 有总量限制：使用带库存检查的原子更新
                 int affected = couponConfigMapper.incrementClaimedQuantityIfAvailable(coupon.getId());
                 if (affected == 0) {
                     throw new CouponInvalidException(
                             CouponClaimResult.ERROR_COUPON_OUT_OF_STOCK,
                             "优惠券已被领取完，请稍后重试");
                 }
-                int updatedClaimedQuantity = (coupon.getClaimedQuantity() == null ? 0 : coupon.getClaimedQuantity()) + 1;
+            } else {
-                coupon.setClaimedQuantity(updatedClaimedQuantity);
+                // 无总量限制：无条件增加已领取数量（用于统计）
+                couponConfigMapper.incrementClaimedQuantity(coupon.getId());
             }
+            int updatedClaimedQuantity = (coupon.getClaimedQuantity() == null ? 0 : coupon.getClaimedQuantity()) + 1;
+            coupon.setClaimedQuantity(updatedClaimedQuantity);
 
             log.info("优惠券领取成功: userId={}, couponId={}, claimRecordId={}",
                     request.getUserId(), request.getCouponId(), claimRecord.getId());

src/main/java/com/ycwl/basic/pricing/service/impl/SceneCouponServiceImpl.java

@@ -24,7 +24,6 @@ import org.springframework.dao.DuplicateKeyException;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
-import java.time.LocalDateTime;
 import java.util.ArrayList;
 import java.util.Date;
 import java.util.List;
@@ -301,11 +300,11 @@ public class SceneCouponServiceImpl implements ISceneCouponService {
         }
 
         // 2. 检查有效期
-        LocalDateTime now = LocalDateTime.now();
+        Date now = new Date();
-        if (coupon.getValidFrom() != null && now.isBefore(coupon.getValidFrom())) {
+        if (coupon.getValidFrom() != null && now.before(coupon.getValidFrom())) {
             return "优惠券尚未生效";
         }
-        if (coupon.getValidUntil() != null && now.isAfter(coupon.getValidUntil())) {
+        if (coupon.getValidUntil() != null && now.after(coupon.getValidUntil())) {
             return "优惠券已过期";
         }