fix: 批量修复功能问题 - 购物车结算/订单库存积分/搜索/抽奖/个人资料等

backend/internal/api/handlers/lottery.go

@@ -52,6 +52,31 @@ func (h *LotteryHandler) Register(c *gin.Context) {
 		return
 	}
 
+	if !lottery.IsActive {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Lottery is not active"})
+		return
+	}
+
+	if lottery.TotalQuota != nil && *lottery.TotalQuota > 0 {
+		var participantCount int64
+		utils.DB.Model(&models.LotteryParticipant{}).Where("lottery_id = ?", id).Count(&participantCount)
+		if int(participantCount) >= *lottery.TotalQuota {
+			c.JSON(http.StatusBadRequest, gin.H{"error": "Lottery quota is full"})
+			return
+		}
+	}
+
+	if lottery.DailyQuota != nil && *lottery.DailyQuota > 0 {
+		today := time.Now().Truncate(24 * time.Hour)
+		tomorrow := today.Add(24 * time.Hour)
+		var dailyCount int64
+		utils.DB.Model(&models.LotteryParticipant{}).Where("lottery_id = ? AND registered_at >= ? AND registered_at < ?", id, today, tomorrow).Count(&dailyCount)
+		if int(dailyCount) >= *lottery.DailyQuota {
+			c.JSON(http.StatusBadRequest, gin.H{"error": "Daily quota is full"})
+			return
+		}
+	}
+
 	var existing models.LotteryParticipant
 	if err := utils.DB.Where("lottery_id = ? AND user_id = ?", id, userID).First(&existing).Error; err == nil {
 		c.JSON(http.StatusBadRequest, gin.H{"error": "Already registered"})