package handlers

import (
	"encoding/json"
	"net/http"
	"stocksearch/services"
)

// OrderHandler 주문/계좌 REST API 핸들러
type OrderHandler struct {
	orderSvc   *services.OrderService
	accountSvc *services.AccountService
}

// NewOrderHandler 핸들러 초기화
func NewOrderHandler() *OrderHandler {
	return &OrderHandler{
		orderSvc:   services.GetOrderService(),
		accountSvc: services.GetAccountService(),
	}
}

// Buy POST /api/order/buy — 매수주문 (kt10000)
func (h *OrderHandler) Buy(w http.ResponseWriter, r *http.Request) {
	var req services.OrderRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		jsonError(w, "요청 파싱 실패", http.StatusBadRequest)
		return
	}
	if req.Exchange == "" {
		req.Exchange = "KRX"
	}
	if req.TradeTP == "" {
		req.TradeTP = "0"
	}

	result, err := h.orderSvc.Buy(req)
	if err != nil {
		jsonError(w, err.Error(), http.StatusInternalServerError)
		return
	}
	jsonOK(w, result)
}

// Sell POST /api/order/sell — 매도주문 (kt10001)
func (h *OrderHandler) Sell(w http.ResponseWriter, r *http.Request) {
	var req services.OrderRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		jsonError(w, "요청 파싱 실패", http.StatusBadRequest)
		return
	}
	if req.Exchange == "" {
		req.Exchange = "KRX"
	}
	if req.TradeTP == "" {
		req.TradeTP = "0"
	}

	result, err := h.orderSvc.Sell(req)
	if err != nil {
		jsonError(w, err.Error(), http.StatusInternalServerError)
		return
	}
	jsonOK(w, result)
}

// Modify PUT /api/order/modify — 정정주문 (kt10002)
func (h *OrderHandler) Modify(w http.ResponseWriter, r *http.Request) {
	var req struct {
		Exchange   string `json:"exchange"`
		OrigOrdNo  string `json:"origOrdNo"`
		Code       string `json:"code"`
		Qty        string `json:"qty"`
		Price      string `json:"price"`
	}
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		jsonError(w, "요청 파싱 실패", http.StatusBadRequest)
		return
	}
	if req.Exchange == "" {
		req.Exchange = "KRX"
	}

	result, err := h.orderSvc.Modify(req.Exchange, req.OrigOrdNo, req.Code, req.Qty, req.Price)
	if err != nil {
		jsonError(w, err.Error(), http.StatusInternalServerError)
		return
	}
	jsonOK(w, result)
}

// Cancel DELETE /api/order — 취소주문 (kt10003)
func (h *OrderHandler) Cancel(w http.ResponseWriter, r *http.Request) {
	var req struct {
		Exchange  string `json:"exchange"`
		OrigOrdNo string `json:"origOrdNo"`
		Code      string `json:"code"`
		Qty       string `json:"qty"`
	}
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		jsonError(w, "요청 파싱 실패", http.StatusBadRequest)
		return
	}
	if req.Exchange == "" {
		req.Exchange = "KRX"
	}
	if req.Qty == "" {
		req.Qty = "0" // 전량취소
	}

	result, err := h.orderSvc.Cancel(req.Exchange, req.OrigOrdNo, req.Code, req.Qty)
	if err != nil {
		jsonError(w, err.Error(), http.StatusInternalServerError)
		return
	}
	jsonOK(w, result)
}

// GetBalance GET /api/account/balance — 계좌 잔고 (kt00018)
func (h *OrderHandler) GetBalance(w http.ResponseWriter, r *http.Request) {
	result, err := h.accountSvc.GetBalance()
	if err != nil {
		jsonError(w, err.Error(), http.StatusInternalServerError)
		return
	}
	jsonOK(w, result)
}

// GetPending GET /api/account/pending — 미체결 주문 (ka10075)
func (h *OrderHandler) GetPending(w http.ResponseWriter, r *http.Request) {
	orders, err := h.accountSvc.GetPendingOrders()
	if err != nil {
		jsonError(w, err.Error(), http.StatusInternalServerError)
		return
	}
	if orders == nil {
		orders = []services.PendingOrder{}
	}
	jsonOK(w, orders)
}

// GetHistory GET /api/account/history — 체결내역 (ka10076)
func (h *OrderHandler) GetHistory(w http.ResponseWriter, r *http.Request) {
	history, err := h.accountSvc.GetOrderHistory()
	if err != nil {
		jsonError(w, err.Error(), http.StatusInternalServerError)
		return
	}
	if history == nil {
		history = []services.OrderHistory{}
	}
	jsonOK(w, history)
}

// GetDeposit GET /api/account/deposit — 예수금 상세 조회 (kt00001)
func (h *OrderHandler) GetDeposit(w http.ResponseWriter, r *http.Request) {
	result, err := h.accountSvc.GetDepositDetail()
	if err != nil {
		jsonError(w, err.Error(), http.StatusInternalServerError)
		return
	}
	jsonOK(w, result)
}

// GetOrderable GET /api/account/orderable?code=&price=&side= — 주문가능금액/수량 (kt00010)
func (h *OrderHandler) GetOrderable(w http.ResponseWriter, r *http.Request) {
	code := r.URL.Query().Get("code")
	price := r.URL.Query().Get("price")
	side := r.URL.Query().Get("side") // buy 또는 sell
	if price == "" {
		price = "0"
	}

	// 키움 API: 1=매도, 2=매수
	tradeTp := "2"
	if side == "sell" {
		tradeTp = "1"
	}

	result, err := h.accountSvc.GetOrderable(code, price, tradeTp)
	if err != nil {
		jsonError(w, err.Error(), http.StatusInternalServerError)
		return
	}
	jsonOK(w, result)
}