Initial commit

server/internal/handler/coupon.go

@@ -0,0 +1,186 @@
+package handler
+
+import (
+	"dianshang/internal/service"
+	"dianshang/pkg/response"
+	"dianshang/pkg/utils"
+
+	"github.com/gin-gonic/gin"
+)
+
+// CouponHandler 优惠券处理器
+type CouponHandler struct {
+	couponService *service.CouponService
+}
+
+// NewCouponHandler 创建优惠券处理器
+func NewCouponHandler(couponService *service.CouponService) *CouponHandler {
+	return &CouponHandler{
+		couponService: couponService,
+	}
+}
+
+// GetAvailableCoupons 获取可用优惠券列表
+func (h *CouponHandler) GetAvailableCoupons(c *gin.Context) {
+	// 尝试获取用户ID，如果有用户登录则返回包含已领取状态的数据
+	userIDValue, exists := c.Get("user_id")
+	var userID uint = 0
+	if exists {
+		userID = userIDValue.(uint)
+	}
+
+	coupons, err := h.couponService.GetAvailableCouponsWithUserStatus(userID)
+	if err != nil {
+		response.ErrorWithMessage(c, response.ERROR, err.Error())
+		return
+	}
+
+	response.Success(c, coupons)
+}
+
+// GetUserCoupons 获取用户优惠券
+func (h *CouponHandler) GetUserCoupons(c *gin.Context) {
+	userIDValue, exists := c.Get("user_id")
+	if !exists {
+		response.Unauthorized(c)
+		return
+	}
+	userID := userIDValue.(uint)
+
+	status := utils.StringToInt(c.DefaultQuery("status", "1")) // 1未使用，2已使用，3已过期
+	coupons, err := h.couponService.GetUserCoupons(userID, status)
+	if err != nil {
+		response.ErrorWithMessage(c, response.ERROR, err.Error())
+		return
+	}
+
+	response.Success(c, coupons)
+}
+
+// ReceiveCoupon 领取优惠券
+func (h *CouponHandler) ReceiveCoupon(c *gin.Context) {
+	userIDValue, exists := c.Get("user_id")
+	if !exists {
+		response.Unauthorized(c)
+		return
+	}
+	userID := userIDValue.(uint)
+
+	couponID := utils.StringToUint(c.Param("id"))
+	if couponID == 0 {
+		response.BadRequest(c, "无效的优惠券ID")
+		return
+	}
+
+	err := h.couponService.ReceiveCoupon(userID, couponID)
+	if err != nil {
+		response.ErrorWithMessage(c, response.ERROR, err.Error())
+		return
+	}
+
+	response.Success(c, nil)
+}
+
+// UseCoupon 使用优惠券
+func (h *CouponHandler) UseCoupon(c *gin.Context) {
+	userIDValue, exists := c.Get("user_id")
+	if !exists {
+		response.Unauthorized(c)
+		return
+	}
+	userID := userIDValue.(uint)
+
+	userCouponID := utils.StringToUint(c.Param("id"))
+	if userCouponID == 0 {
+		response.BadRequest(c, "无效的优惠券ID")
+		return
+	}
+
+	var req struct {
+		OrderID uint `json:"order_id" binding:"required"`
+	}
+	if err := c.ShouldBindJSON(&req); err != nil {
+		response.BadRequest(c, "参数错误")
+		return
+	}
+
+	err := h.couponService.UseCoupon(userID, userCouponID, req.OrderID)
+	if err != nil {
+		response.ErrorWithMessage(c, response.ERROR, err.Error())
+		return
+	}
+
+	response.Success(c, nil)
+}
+
+// GetAvailableCouponsForOrder 获取订单可用优惠券
+func (h *CouponHandler) GetAvailableCouponsForOrder(c *gin.Context) {
+	userIDValue, exists := c.Get("user_id")
+	if !exists {
+		response.Unauthorized(c)
+		return
+	}
+	userID := userIDValue.(uint)
+
+	orderAmountStr := c.Query("order_amount")
+	if orderAmountStr == "" {
+		response.BadRequest(c, "订单金额不能为空")
+		return
+	}
+
+	orderAmount := utils.StringToFloat64(orderAmountStr)
+	if orderAmount <= 0 {
+		response.BadRequest(c, "订单金额必须大于0")
+		return
+	}
+
+	coupons, err := h.couponService.GetAvailableCouponsForOrder(userID, orderAmount)
+	if err != nil {
+		response.ErrorWithMessage(c, response.ERROR, err.Error())
+		return
+	}
+
+	response.Success(c, coupons)
+}
+
+// ValidateCoupon 验证优惠券
+func (h *CouponHandler) ValidateCoupon(c *gin.Context) {
+	userIDValue, exists := c.Get("user_id")
+	if !exists {
+		response.Unauthorized(c)
+		return
+	}
+	userID := userIDValue.(uint)
+
+	userCouponID := utils.StringToUint(c.Param("id"))
+	if userCouponID == 0 {
+		response.BadRequest(c, "无效的优惠券ID")
+		return
+	}
+
+	orderAmountStr := c.Query("order_amount")
+	if orderAmountStr == "" {
+		response.BadRequest(c, "订单金额不能为空")
+		return
+	}
+
+	orderAmount := utils.StringToFloat64(orderAmountStr)
+	if orderAmount <= 0 {
+		response.BadRequest(c, "订单金额必须大于0")
+		return
+	}
+
+	userCoupon, discountAmount, err := h.couponService.ValidateCoupon(userID, userCouponID, orderAmount)
+	if err != nil {
+		response.ErrorWithMessage(c, response.ERROR, err.Error())
+		return
+	}
+
+	result := map[string]interface{}{
+		"user_coupon":     userCoupon,
+		"discount_amount": discountAmount,
+		"can_use":         true,
+	}
+
+	response.Success(c, result)
+}