import { kisGet, kisPost } from "@/lib/kis/client";
import { KisCredentialInput } from "@/lib/kis/config";
import {
  DashboardOrderSide,
  DashboardOrderType,
} from "@/features/trade/types/trade.types";

/**
 * @file lib/kis/trade.ts
 * @description KIS 주식 주문/잔고 관련 API
 */

export interface KisOrderCashOutput {
  KRX_FWDG_ORD_ORGNO?: string; // 한국거래소전송주문조직번호
  ODNO?: string; // 주문번호
  ORD_TMD?: string; // 주문시각
}

interface KisOrderCashBody {
  CANO: string; // 종합계좌번호(8자리)
  ACNT_PRDT_CD: string; // 계좌상품코드(2자리)
  PDNO: string; // 종목코드
  ORD_DVSN: string; // 주문구분(00:지정가, 01:시장가...)
  ORD_QTY: string; // 주문수량
  ORD_UNPR: string; // 주문단가
}

interface KisInquirePsblOrderOutput {
  ord_psbl_cash?: string; // 주문가능현금
  nrcvb_buy_amt?: string; // 미수없는매수금액
  max_buy_amt?: string; // 최대매수금액
  nrcvb_buy_qty?: string; // 미수없는매수수량
  max_buy_qty?: string; // 최대매수수량
}

/**
 * 현금 주문(매수/매도) 실행
 */
export async function executeOrderCash(
  params: {
    symbol: string;
    side: DashboardOrderSide;
    orderType: DashboardOrderType;
    quantity: number;
    price: number;
    accountNo: string;
    accountProductCode: string;
  },
  credentials?: KisCredentialInput,
) {
  const trId = resolveOrderTrId(params.side, credentials?.tradingEnv);
  const ordDvsn = resolveOrderDivision(params.orderType);

  const body: KisOrderCashBody = {
    CANO: params.accountNo,
    ACNT_PRDT_CD: params.accountProductCode,
    PDNO: params.symbol,
    ORD_DVSN: ordDvsn,
    ORD_QTY: String(params.quantity),
    ORD_UNPR: String(params.price),
  };

  const response = await kisPost<KisOrderCashOutput>(
    "/uapi/domestic-stock/v1/trading/order-cash",
    trId,
    body,
    credentials,
  );

  return response.output ?? {};
}

/**
 * 매수가능금액(주문가능현금) 조회
 */
export async function executeInquireOrderableCash(
  params: {
    symbol: string;
    price: number;
    orderType: DashboardOrderType;
    accountNo: string;
    accountProductCode: string;
  },
  credentials?: KisCredentialInput,
) {
  const trId = resolveInquireOrderableTrId(credentials?.tradingEnv);
  const ordDvsn = resolveOrderDivision(params.orderType);
  const ordUnpr = Math.max(1, Math.floor(params.price || 0));

  const response = await kisGet<KisInquirePsblOrderOutput | KisInquirePsblOrderOutput[]>(
    "/uapi/domestic-stock/v1/trading/inquire-psbl-order",
    trId,
    {
      CANO: params.accountNo,
      ACNT_PRDT_CD: params.accountProductCode,
      PDNO: params.symbol,
      ORD_UNPR: String(ordUnpr),
      ORD_DVSN: ordDvsn,
      CMA_EVLU_AMT_ICLD_YN: "N",
      OVRS_ICLD_YN: "N",
    },
    credentials,
  );

  const rawRow = Array.isArray(response.output)
    ? (response.output[0] ?? {})
    : (response.output ?? {});

  const orderableCash = pickFirstPositive(
    toSafeNumber(rawRow.nrcvb_buy_amt),
    toSafeNumber(rawRow.ord_psbl_cash),
    toSafeNumber(rawRow.max_buy_amt),
  );

  return {
    orderableCash,
    noReceivableBuyAmount: toSafeNumber(rawRow.nrcvb_buy_amt),
    maxBuyAmount: toSafeNumber(rawRow.max_buy_amt),
    noReceivableBuyQuantity: Math.floor(toSafeNumber(rawRow.nrcvb_buy_qty)),
    maxBuyQuantity: Math.floor(toSafeNumber(rawRow.max_buy_qty)),
  };
}

function resolveOrderTrId(side: DashboardOrderSide, env?: "real" | "mock") {
  const isMock = env === "mock";
  if (side === "buy") {
    // 매수
    return isMock ? "VTTC0802U" : "TTTC0802U";
  } else {
    // 매도
    return isMock ? "VTTC0801U" : "TTTC0801U";
  }
}

function resolveInquireOrderableTrId(env?: "real" | "mock") {
  return env === "mock" ? "VTTC8908R" : "TTTC8908R";
}

function resolveOrderDivision(type: DashboardOrderType) {
  // 00: 지정가, 01: 시장가
  if (type === "market") return "01";
  return "00";
}

function toSafeNumber(value?: string) {
  if (!value) return 0;
  const parsed = Number(value.replaceAll(",", "").trim());
  if (!Number.isFinite(parsed)) return 0;
  return parsed;
}

function pickFirstPositive(...values: number[]) {
  for (const value of values) {
    if (value > 0) return value;
  }

  return 0;
}