package handler

import (
	"strconv"

	"gotest/internal/service"

	"github.com/gin-gonic/gin"
)

// ShopHandler 电商数据处理器
type ShopHandler struct {
	svc *service.ShopService
}

// NewShopHandler 创建电商数据处理器
func NewShopHandler(svc *service.ShopService) *ShopHandler {
	return &ShopHandler{svc: svc}
}

// GetHomeData 获取商城首页数据 GET /api/v1/shop/home
func (h *ShopHandler) GetHomeData(c *gin.Context) {
	data, err := h.svc.GetHomeData()
	if err != nil {
		FailInternal(c, "获取首页数据失败")
		return
	}
	Success(c, data)
}

// ListCategories 获取分类列表 GET /api/v1/shop/categories
func (h *ShopHandler) ListCategories(c *gin.Context) {
	data, err := h.svc.ListCategories()
	if err != nil {
		FailInternal(c, "获取分类失败")
		return
	}
	Success(c, data)
}

// ListProducts 获取商品列表 GET /api/v1/shop/products?category_id=&keyword=&sort=&page=&page_size=
func (h *ShopHandler) ListProducts(c *gin.Context) {
	categoryID, _ := strconv.ParseUint(c.Query("category_id"), 10, 64)
	keyword := c.Query("keyword")
	sort := c.Query("sort")
	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "12"))
	if page < 1 {
		page = 1
	}
	if pageSize < 1 || pageSize > 100 {
		pageSize = 12
	}
	data, err := h.svc.ListProducts(uint(categoryID), keyword, sort, page, pageSize)
	if err != nil {
		FailInternal(c, "获取商品列表失败")
		return
	}
	Success(c, data)
}

// GetProduct 获取商品详情 GET /api/v1/shop/products/:id
func (h *ShopHandler) GetProduct(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		FailBadRequest(c, "无效的商品 ID")
		return
	}
	data, err := h.svc.GetProduct(uint(id))
	if err != nil {
		FailBadRequest(c, "商品不存在")
		return
	}
	Success(c, data)
}

// ListFeatured 获取推荐商品 GET /api/v1/shop/featured?limit=
func (h *ShopHandler) ListFeatured(c *gin.Context) {
	limit, _ := strconv.Atoi(c.DefaultQuery("limit", "8"))
	if limit < 1 || limit > 50 {
		limit = 8
	}
	data, err := h.svc.ListFeatured(limit)
	if err != nil {
		FailInternal(c, "获取推荐商品失败")
		return
	}
	Success(c, data)
}