package handler

import (
	"strconv"

	"health-ai/internal/api/middleware"
	"health-ai/internal/service"
	"health-ai/pkg/response"

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

type ProductHandler struct {
	productService *service.ProductService
}

func NewProductHandler() *ProductHandler {
	return &ProductHandler{
		productService: service.NewProductService(),
	}
}

// GetProducts 获取产品列表
// @Summary 获取产品列表
// @Tags 产品
// @Accept json
// @Produce json
// @Param page query int false "页码，默认1"
// @Param page_size query int false "每页数量，默认20"
// @Success 200 {object} response.Response{data=service.ProductListResponse}
// @Router /api/products [get]
func (h *ProductHandler) GetProducts(c *gin.Context) {
	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "20"))

	result, err := h.productService.GetProducts(page, pageSize)
	if err != nil {
		response.Error(c, 500, err.Error())
		return
	}
	response.Success(c, result)
}

// GetProduct 获取产品详情
// @Summary 获取产品详情
// @Tags 产品
// @Accept json
// @Produce json
// @Param id path int true "产品ID"
// @Success 200 {object} response.Response{data=model.Product}
// @Router /api/products/{id} [get]
func (h *ProductHandler) GetProduct(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 32)
	if err != nil {
		response.BadRequest(c, "无效的产品ID")
		return
	}

	product, err := h.productService.GetProductByID(uint(id))
	if err != nil {
		response.Error(c, 404, err.Error())
		return
	}
	response.Success(c, product)
}

// GetProductsByCategory 按分类获取产品
// @Summary 按分类获取产品
// @Tags 产品
// @Accept json
// @Produce json
// @Param category query string true "分类名称"
// @Success 200 {object} response.Response{data=[]model.Product}
// @Router /api/products/category [get]
func (h *ProductHandler) GetProductsByCategory(c *gin.Context) {
	category := c.Query("category")
	if category == "" {
		response.BadRequest(c, "请指定分类")
		return
	}

	products, err := h.productService.GetProductsByCategory(category)
	if err != nil {
		response.Error(c, 500, err.Error())
		return
	}
	response.Success(c, products)
}

// GetRecommendedProducts 获取推荐产品（基于用户体质）
// @Summary 获取推荐产品
// @Tags 产品
// @Accept json
// @Produce json
// @Param Authorization header string true "Bearer Token"
// @Success 200 {object} response.Response{data=service.ProductRecommendResponse}
// @Router /api/products/recommend [get]
func (h *ProductHandler) GetRecommendedProducts(c *gin.Context) {
	userID := middleware.GetUserID(c)
	result, err := h.productService.GetRecommendedProducts(userID)
	if err != nil {
		response.Error(c, 400, err.Error())
		return
	}
	response.Success(c, result)
}

// SearchProducts 搜索产品
// @Summary 搜索产品
// @Tags 产品
// @Accept json
// @Produce json
// @Param keyword query string true "搜索关键词"
// @Success 200 {object} response.Response{data=[]model.Product}
// @Router /api/products/search [get]
func (h *ProductHandler) SearchProducts(c *gin.Context) {
	keyword := c.Query("keyword")
	if keyword == "" {
		response.BadRequest(c, "请输入搜索关键词")
		return
	}

	products, err := h.productService.SearchProducts(keyword)
	if err != nil {
		response.Error(c, 500, err.Error())
		return
	}
	response.Success(c, products)
}

// SyncPurchase 同步商城购买记录
// @Summary 同步商城购买记录
// @Tags 商城同步
// @Accept json
// @Produce json
// @Param request body service.PurchaseSyncRequest true "购买记录"
// @Success 200 {object} response.Response
// @Router /api/sync/purchase [post]
func (h *ProductHandler) SyncPurchase(c *gin.Context) {
	// TODO: 验证同步密钥

	var req service.PurchaseSyncRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.BadRequest(c, "参数错误: "+err.Error())
		return
	}

	if err := h.productService.SyncPurchase(&req); err != nil {
		response.Error(c, 500, err.Error())
		return
	}

	response.SuccessWithMessage(c, "同步成功", nil)
}

// GetPurchaseHistory 获取购买历史
// @Summary 获取购买历史
// @Tags 产品
// @Accept json
// @Produce json
// @Param Authorization header string true "Bearer Token"
// @Success 200 {object} response.Response{data=[]model.PurchaseHistory}
// @Router /api/user/purchase-history [get]
func (h *ProductHandler) GetPurchaseHistory(c *gin.Context) {
	userID := middleware.GetUserID(c)
	history, err := h.productService.GetPurchaseHistory(userID)
	if err != nil {
		response.Error(c, 500, err.Error())
		return
	}
	response.Success(c, history)
}