package handler

import (
	"dianshang/internal/model"
	"dianshang/internal/service"
	"dianshang/pkg/response"
	"dianshang/pkg/utils"
	"strconv"
	"strings"

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

// ProductHandler 浜у搧澶勭悊鍣?
type ProductHandler struct {
	productService *service.ProductService
}

// NewProductHandler 鍒涘缓浜у搧澶勭悊鍣?
func NewProductHandler(productService *service.ProductService) *ProductHandler {
	return &ProductHandler{
		productService: productService,
	}
}

// GetProductList 鑾峰彇浜у搧鍒楄〃
func (h *ProductHandler) GetProductList(c *gin.Context) {
	page := utils.StringToInt(c.DefaultQuery("page", "1"))
	pageSize := utils.StringToInt(c.DefaultQuery("page_size", "20"))
	
	// 支持 category_ids （逗号分隔）或 category_id
	var categoryID uint
	if categoryIDsStr := c.Query("category_ids"); categoryIDsStr != "" {
		// 解析第一个分类ID
		ids := strings.Split(categoryIDsStr, ",")
		if len(ids) > 0 {
			categoryID = utils.StringToUint(strings.TrimSpace(ids[0]))
		}
	} else {
		categoryID = utils.StringToUint(c.Query("category_id"))
	}
	
	keyword := c.Query("keyword")
	minPrice, _ := strconv.ParseFloat(c.Query("min_price"), 64)
	maxPrice, _ := strconv.ParseFloat(c.Query("max_price"), 64)
	
	// 库存筛选参数
	var inStock *bool
	if inStockStr := c.Query("in_stock"); inStockStr != "" {
		if inStockStr == "true" {
			trueVal := true
			inStock = &trueVal
		} else if inStockStr == "false" {
			falseVal := false
			inStock = &falseVal
		}
	}
	
	// 处理排序参数：将前端传递的数字参数转换为后端期望的字符串参数
	sortParam := c.Query("sort")
	sortTypeParam := c.Query("sortType")
	
	var sort, sortType string
	
	// 如果sort=1，表示按价格排序
	if sortParam == "1" {
		sort = "price"
		// sortType: 0=升序(asc), 1=降序(desc)
		if sortTypeParam == "0" {
			sortType = "asc"
		} else {
			sortType = "desc"
		}
	} else {
		// 默认排序或其他排序方式
		sort = "default"
		sortType = "desc"
	}

	products, pagination, err := h.productService.GetProductList(page, pageSize, categoryID, keyword, minPrice, maxPrice, inStock, sort, sortType)
	if err != nil {
		response.ErrorWithMessage(c, response.ERROR, err.Error())
		return
	}

	response.Page(c, products, pagination.Total, pagination.Page, pagination.PageSize)
}

// GetProductDetail 鑾峰彇浜у搧璇︽儏
func (h *ProductHandler) GetProductDetail(c *gin.Context) {
	idStr := c.Param("id")
	id := utils.StringToUint(idStr)
	if id == 0 {
		response.BadRequest(c, "鏃犳晥鐨勪骇鍝両D")
		return
	}

	product, err := h.productService.GetProductDetail(id)
	if err != nil {
		response.ErrorWithMessage(c, response.ERROR_PRODUCT_NOT_FOUND, "产品不存在")
		return
	}

	response.Success(c, product)
}

// CreateProduct 鍒涘缓浜у搧
func (h *ProductHandler) CreateProduct(c *gin.Context) {
	var product model.Product
	if err := c.ShouldBindJSON(&product); err != nil {
		response.BadRequest(c, "鍙傛暟閿欒: "+err.Error())
		return
	}

	if err := h.productService.CreateProduct(&product); err != nil {
		response.ErrorWithMessage(c, response.ERROR, err.Error())
		return
	}

	response.Success(c, product)
}

// UpdateProduct 鏇存柊浜у搧
func (h *ProductHandler) UpdateProduct(c *gin.Context) {
	idStr := c.Param("id")
	id := utils.StringToUint(idStr)
	if id == 0 {
		response.BadRequest(c, "鏃犳晥鐨勪骇鍝両D")
		return
	}

	var updates map[string]interface{}
	if err := c.ShouldBindJSON(&updates); err != nil {
		response.BadRequest(c, "鍙傛暟閿欒: "+err.Error())
		return
	}

	if err := h.productService.UpdateProduct(id, updates); err != nil {
		response.ErrorWithMessage(c, response.ERROR, err.Error())
		return
	}

	response.Success(c, nil)
}

// DeleteProduct 鍒犻櫎浜у搧
func (h *ProductHandler) DeleteProduct(c *gin.Context) {
	idStr := c.Param("id")
	id := utils.StringToUint(idStr)
	if id == 0 {
		response.BadRequest(c, "鏃犳晥鐨勪骇鍝両D")
		return
	}

	if err := h.productService.DeleteProduct(id); err != nil {
		response.ErrorWithMessage(c, response.ERROR, err.Error())
		return
	}

	response.Success(c, nil)
}

// GetCategories 鑾峰彇鍒嗙被鍒楄〃
func (h *ProductHandler) GetCategories(c *gin.Context) {
	// 支持平台筛选参数：platform=web 或 platform=miniprogram
	platform := c.Query("platform")
	
	var categories []model.Category
	var err error
	
	if platform != "" {
		// 根据平台获取分类
		categories, err = h.productService.GetCategoriesByPlatform(platform)
	} else {
		// 获取所有分类
		categories, err = h.productService.GetCategories()
	}
	
	if err != nil {
		response.ErrorWithMessage(c, response.ERROR, err.Error())
		return
	}

	response.Success(c, categories)
}

// CreateCategory 鍒涘缓鍒嗙被
func (h *ProductHandler) CreateCategory(c *gin.Context) {
	var category model.Category
	if err := c.ShouldBindJSON(&category); err != nil {
		response.BadRequest(c, "鍙傛暟閿欒: "+err.Error())
		return
	}

	if err := h.productService.CreateCategory(&category); err != nil {
		response.ErrorWithMessage(c, response.ERROR, err.Error())
		return
	}

	response.Success(c, category)
}

// UpdateCategory 鏇存柊鍒嗙被
func (h *ProductHandler) UpdateCategory(c *gin.Context) {
	idStr := c.Param("id")
	id := utils.StringToUint(idStr)
	if id == 0 {
		response.BadRequest(c, "鏃犳晥鐨勫垎绫籌D")
		return
	}

	var updates map[string]interface{}
	if err := c.ShouldBindJSON(&updates); err != nil {
		response.BadRequest(c, "鍙傛暟閿欒: "+err.Error())
		return
	}

	if err := h.productService.UpdateCategory(id, updates); err != nil {
		response.ErrorWithMessage(c, response.ERROR, err.Error())
		return
	}

	response.Success(c, nil)
}

// DeleteCategory 鍒犻櫎鍒嗙被
func (h *ProductHandler) DeleteCategory(c *gin.Context) {
	idStr := c.Param("id")
	id := utils.StringToUint(idStr)
	if id == 0 {
		response.BadRequest(c, "鏃犳晥鐨勫垎绫籌D")
		return
	}

	if err := h.productService.DeleteCategory(id); err != nil {
		response.ErrorWithMessage(c, response.ERROR, err.Error())
		return
	}

	response.Success(c, nil)
}

// GetProductReviews 鑾峰彇浜у搧璇勪环鍒楄〃
func (h *ProductHandler) GetProductReviews(c *gin.Context) {
	idStr := c.Param("id")
	productID := utils.StringToUint(idStr)
	if productID == 0 {
		response.BadRequest(c, "鏃犳晥鐨勪骇鍝両D")
		return
	}

	page := utils.StringToInt(c.DefaultQuery("page", "1"))
	pageSize := utils.StringToInt(c.DefaultQuery("page_size", "20"))

	reviews, pagination, err := h.productService.GetProductReviews(productID, page, pageSize)
	if err != nil {
		response.ErrorWithMessage(c, response.ERROR, err.Error())
		return
	}

	response.Page(c, reviews, pagination.Total, pagination.Page, pagination.PageSize)
}

// CreateReview 鍒涘缓璇勪环
func (h *ProductHandler) CreateReview(c *gin.Context) {
	userID, exists := c.Get("user_id")
	if !exists {
		response.Unauthorized(c)
		return
	}

	var review model.ProductReview
	if err := c.ShouldBindJSON(&review); err != nil {
		response.BadRequest(c, "鍙傛暟閿欒: "+err.Error())
		return
	}

	if err := h.productService.CreateReview(userID.(uint), &review); err != nil {
		response.ErrorWithMessage(c, response.ERROR, err.Error())
		return
	}

	response.Success(c, review)
}

// SearchProducts 鎼滅储浜у搧
func (h *ProductHandler) SearchProducts(c *gin.Context) {
    keyword := c.Query("keyword")
    if keyword == "" {
        response.BadRequest(c, "璇疯緭鍏ユ悳绱㈠叧閿瘝")
        return
    }

    page := utils.StringToInt(c.DefaultQuery("page", "1"))
    pageSize := utils.StringToInt(c.DefaultQuery("page_size", "20"))

    // 价格筛选（后端以“元”存储，参数按“元”传递）
    minPrice := utils.StringToFloat64(c.Query("min_price"))
    maxPrice := utils.StringToFloat64(c.Query("max_price"))

    // 排序参数（搜索页使用 sort_by / sort_order）
    sort := c.DefaultQuery("sort_by", "default")
    sortType := c.DefaultQuery("sort_order", "desc")
    // 兼容其它命名（若存在）
    if s := c.Query("sort"); s != "" {
        sort = s
    }
    if st := c.Query("sortType"); st != "" {
        sortType = st
    }

    products, pagination, err := h.productService.SearchProducts(keyword, page, pageSize, minPrice, maxPrice, sort, sortType)
    if err != nil {
        response.ErrorWithMessage(c, response.ERROR, err.Error())
        return
    }

	response.Page(c, products, pagination.Total, pagination.Page, pagination.PageSize)
}

// GetHotProducts 鑾峰彇鐑棬浜у搧
func (h *ProductHandler) GetHotProducts(c *gin.Context) {
	limit := utils.StringToInt(c.DefaultQuery("limit", "10"))

	products, err := h.productService.GetHotProducts(limit)
	if err != nil {
		response.ErrorWithMessage(c, response.ERROR, err.Error())
		return
	}

	response.Success(c, products)
}

// GetRecommendProducts 获取推荐产品
func (h *ProductHandler) GetRecommendProducts(c *gin.Context) {
	limit := utils.StringToInt(c.DefaultQuery("limit", "10"))

	products, err := h.productService.GetRecommendProducts(limit)
	if err != nil {
		response.ErrorWithMessage(c, response.ERROR, err.Error())
		return
	}

	response.Success(c, products)
}

// GetProductSKUs 获取产品SKU列表
func (h *ProductHandler) GetProductSKUs(c *gin.Context) {
	idStr := c.Param("id")
	productID := utils.StringToUint(idStr)
	if productID == 0 {
		response.BadRequest(c, "无效的产品ID")
		return
	}

	skus, err := h.productService.GetProductSKUs(productID)
	if err != nil {
		response.ErrorWithMessage(c, response.ERROR, err.Error())
		return
	}

	response.Success(c, skus)
}

// GetProductTags 获取产品标签列表
func (h *ProductHandler) GetProductTags(c *gin.Context) {
	tags, err := h.productService.GetProductTags()
	if err != nil {
		response.ErrorWithMessage(c, response.ERROR, err.Error())
		return
	}

	response.Success(c, tags)
}

// GetStores 获取店铺列表
func (h *ProductHandler) GetStores(c *gin.Context) {
	stores, err := h.productService.GetStores()
	if err != nil {
		response.ErrorWithMessage(c, response.ERROR, err.Error())
		return
	}

	response.Success(c, stores)
}

// GetProductReviewCount 获取产品评价统计
func (h *ProductHandler) GetProductReviewCount(c *gin.Context) {
	idStr := c.Param("id")
	productID := utils.StringToUint(idStr)
	if productID == 0 {
		response.BadRequest(c, "无效的产品ID")
		return
	}

	reviewCount, err := h.productService.GetProductReviewCount(productID)
	if err != nil {
		response.ErrorWithMessage(c, response.ERROR, err.Error())
		return
	}

	response.Success(c, reviewCount)
}