package handler

import (
	"bytes"
	"encoding/json"
	"io"
	"log"
	"net/http"
	"strconv"
	"sync/atomic"

	"kfz-goods-pricing/internal/service"
)

// GoodsHandler 商品处理器
type GoodsHandler struct {
	goodsService *service.GoodsService
	reqCount     int64
}

// NewGoodsHandler 创建商品处理器实例
func NewGoodsHandler(goodsService *service.GoodsService) *GoodsHandler {
	return &GoodsHandler{
		goodsService: goodsService,
	}
}

// QueryGoods 查询商品接口
func (h *GoodsHandler) QueryGoods(w http.ResponseWriter, r *http.Request) {
	count := atomic.AddInt64(&h.reqCount, 1)

	clientIP := r.RemoteAddr
	if forwarded := r.Header.Get("X-Forwarded-For"); forwarded != "" {
		clientIP = forwarded
	}
	if count%20 == 1 {
		log.Printf("[QueryGoods] 收到请求: clientIP=%s, method=%s", clientIP, r.Method)
	}

	// 只支持POST请求
	if r.Method != http.MethodPost {
		log.Printf("[QueryGoods] 方法不允许: method=%s, clientIP=%s", r.Method, clientIP)
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	// 读取原始body用于调试
	bodyBytes, _ := io.ReadAll(r.Body)

	// 重新创建body供ParseForm使用
	r.Body = io.NopCloser(bytes.NewBuffer(bodyBytes))

	// 解析参数 - ParseMultipartForm 同时支持 form-data 和 x-www-form-urlencoded
	if err := r.ParseMultipartForm(32 << 20); err != nil {
		// 尝试纯表单解析
		if err := r.ParseForm(); err != nil {
			log.Printf("[QueryGoods] 参数解析失败: err=%v, clientIP=%s", err, clientIP)
			http.Error(w, "Invalid request form", http.StatusBadRequest)
			return
		}
	}

	isbn := r.FormValue("isbn")
	if isbn == "0" {
		if count%20 == 1 {
			log.Printf("[QueryGoods] 收到请求 isbn=0")
		}
		var req service.QueryRequest
		req.ISBN = isbn
		resp := h.goodsService.QueryGoods(&req)
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusOK)
		json.NewEncoder(w).Encode(resp)
		return
	}

	bookName := r.FormValue("book_name")
	author := r.FormValue("author")
	publishing := r.FormValue("publishing")
	outID := r.FormValue("out_id")
	quality := r.FormValue("quality")
	queryIndex := r.FormValue("query_index")
	userID := r.FormValue("user_id")
	placeholderDownPrice := r.FormValue("placeholder_down_price")
	minShippingFee := r.FormValue("min_shipping_fee")
	minPrice := r.FormValue("min_price")

	log.Printf("[QueryGoods] 解析参数完成: isbn=%s, book_name=%s, author=%s, publishing=%s, out_id=%s, quality=%s, query_index=%s, user_id=%s, placeholder_down_price=%s, min_shipping_fee=%s, min_price=%s",
		isbn, bookName, author, publishing, outID, quality, queryIndex, userID, placeholderDownPrice, minShippingFee, minPrice)

	var req service.QueryRequest
	req.ISBN = isbn
	req.BookName = bookName
	req.Author = author
	req.Publishing = publishing
	req.OutID = outID
	req.Quality = quality
	req.QueryIndex, _ = strconv.Atoi(queryIndex)
	req.UserID = userID
	req.PlaceholderDownPrice, _ = strconv.ParseFloat(placeholderDownPrice, 64)
	req.MinShippingFee, _ = strconv.ParseFloat(minShippingFee, 64)
	req.MinPrice, _ = strconv.ParseFloat(minPrice, 64)

	// 调用服务层
	resp := h.goodsService.QueryGoods(&req)
	log.Printf("[QueryGoods] 处理完成: id=%d, code=%d, message=%s", resp.ID, resp.Code, resp.Message)

	// 返回响应
	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(http.StatusOK)
	json.NewEncoder(w).Encode(resp)
}