전체적인 리팩토링

lib/kis/trade.ts

@@ -1,4 +1,4 @@
-import { kisPost } from "@/lib/kis/client";
+import { kisGet, kisPost } from "@/lib/kis/client";
 import { KisCredentialInput } from "@/lib/kis/config";
 import {
   DashboardOrderSide,
@@ -25,6 +25,14 @@ interface KisOrderCashBody {
   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
  */
@@ -62,6 +70,57 @@ export async function executeOrderCash(
   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") {
@@ -73,8 +132,27 @@ function resolveOrderTrId(side: DashboardOrderSide, env?: "real" | "mock") {
   }
 }
 
+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;
+}