package handler

import (
	"net/http"
	"strconv"

	"affiliate_dash/internal/middleware"
	"affiliate_dash/internal/pkg/lewan"
	"affiliate_dash/internal/pkg/response"
	"affiliate_dash/internal/service"

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

type PlatformLewanHandler struct {
	merchantSvc *service.MerchantService
	lewanClient *lewan.Client
}

func NewPlatformLewanHandler(merchantSvc *service.MerchantService, lewanClient *lewan.Client) *PlatformLewanHandler {
	return &PlatformLewanHandler{
		merchantSvc: merchantSvc,
		lewanClient: lewanClient,
	}
}

// ListLewanProducts GET /api/platform/lewan/products
// 从乐玩开放平台实时拉取商品列表供管理员浏览与关联
func (h *PlatformLewanHandler) ListLewanProducts(c *gin.Context) {
	if h.lewanClient == nil {
		response.BadRequest(c, "乐玩开放平台尚未配置")
		return
	}
	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	size, _ := strconv.Atoi(c.DefaultQuery("size", "50"))
	keyword := c.Query("keyword")

	result, err := h.lewanClient.ListProducts(c.Request.Context(), page, size, keyword)
	if err != nil {
		response.BadRequest(c, err.Error())
		return
	}
	response.OK(c, result)
}

type updateRoutingReq struct {
	RoutingMode    string   `json:"routing_mode" binding:"required"`
	Priority       []string `json:"priority"`
	DLCGoodID      string   `json:"dlc_good_id"`
	LewanProductID string   `json:"lewan_product_id"`
	LewanName      string   `json:"lewan_name"`
	DeliveryType   string   `json:"delivery_type"`
}

// UpdateProductRouting PUT /api/platform/products/:id/routing
// 管理员更新指定平台商品的履约渠道与优先级
func (h *PlatformLewanHandler) UpdateProductRouting(c *gin.Context) {
	idParam := c.Param("id")
	catalogID, err := strconv.ParseUint(idParam, 10, 64)
	if err != nil || catalogID == 0 {
		response.BadRequest(c, "无效的商品ID")
		return
	}

	var req updateRoutingReq
	if err := c.ShouldBindJSON(&req); err != nil {
		response.BadRequest(c, "参数错误：routing_mode 必填")
		return
	}

	actorUserID := middleware.GetUserID(c)
	routingCfg := service.ProductRoutingConfig{
		RoutingMode:    req.RoutingMode,
		Priority:       req.Priority,
		DLCGoodID:      req.DLCGoodID,
		LewanProductID: req.LewanProductID,
		LewanName:      req.LewanName,
		DeliveryType:   req.DeliveryType,
	}

	if err := h.merchantSvc.UpdateProductRouting(uint(catalogID), routingCfg, actorUserID); err != nil {
		response.BadRequest(c, err.Error())
		return
	}
	response.OK(c, gin.H{"updated": true})
}

type syncLewanProductReq struct {
	LewanProductID string `json:"lewan_product_id" binding:"required"`
	Name           string `json:"name" binding:"required"`
	Category       string `json:"category"`
	SKU            string `json:"sku"`
	Price          int64  `json:"price"`
	DeliveryType   string `json:"delivery_type"`
}

// SyncLewanProduct POST /api/platform/lewan/sync-catalog
// 从乐玩拉取到的商品同步/添加到平台自营商品目录
func (h *PlatformLewanHandler) SyncLewanProduct(c *gin.Context) {
	var req syncLewanProductReq
	if err := c.ShouldBindJSON(&req); err != nil {
		response.BadRequest(c, "参数错误：lewan_product_id 与 name 必填")
		return
	}

	actorUserID := middleware.GetUserID(c)
	item, err := h.merchantSvc.SyncLewanProductToCatalog(service.SyncLewanProductInput{
		LewanProductID: req.LewanProductID,
		Name:           req.Name,
		Category:       req.Category,
		SKU:            req.SKU,
		Price:          req.Price,
		DeliveryType:   req.DeliveryType,
	}, actorUserID)
	if err != nil {
		response.BadRequest(c, err.Error())
		return
	}
	response.WithStatus(c, http.StatusCreated, item)
}

type batchSyncLewanReq struct {
	Products []syncLewanProductReq `json:"products" binding:"required,min=1"`
}

// BatchSyncLewanProducts POST /api/platform/lewan/batch-sync-catalog
// 批量同步/添加乐玩商品到自营商品目录
func (h *PlatformLewanHandler) BatchSyncLewanProducts(c *gin.Context) {
	var req batchSyncLewanReq
	if err := c.ShouldBindJSON(&req); err != nil {
		response.BadRequest(c, "参数错误：products 列表不能为空")
		return
	}

	actorUserID := middleware.GetUserID(c)
	inputs := make([]service.SyncLewanProductInput, len(req.Products))
	for i, p := range req.Products {
		inputs[i] = service.SyncLewanProductInput{
			LewanProductID: p.LewanProductID,
			Name:           p.Name,
			Category:       p.Category,
			SKU:            p.SKU,
			Price:          p.Price,
			DeliveryType:   p.DeliveryType,
		}
	}

	count, err := h.merchantSvc.BatchSyncLewanProductsToCatalog(inputs, actorUserID)
	if err != nil {
		response.BadRequest(c, err.Error())
		return
	}
	response.OK(c, gin.H{"synced_count": count})
}