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features/dashboard/hooks/useKisOrderbookWebSocket.ts

@@ -0,0 +1,184 @@
+import { useEffect, useRef, useState } from "react";
+import {
+  type KisRuntimeCredentials,
+  useKisRuntimeStore,
+} from "@/features/dashboard/store/use-kis-runtime-store";
+import type { DashboardStockOrderBookResponse } from "@/features/dashboard/types/dashboard.types";
+import {
+  buildKisRealtimeMessage,
+  parseKisRealtimeOrderbook,
+} from "@/features/dashboard/utils/kis-realtime.utils";
+
+const KRX_ORDERBOOK_TR_ID = "H0STASP0";
+const KRX_OVERTIME_ORDERBOOK_TR_ID = "H0STOAA0";
+const DEFAULT_ORDERBOOK_TR_ID = "H0UNASP0";
+
+/**
+ * @description 한국 시간 기준으로 시간외 단일가 구간(16:00~18:00) 여부를 판별합니다.
+ * @see features/dashboard/hooks/useKisOrderbookWebSocket.ts resolveOrderBookTrId에서 TR ID 선택 기준으로 사용합니다.
+ */
+function isKrxOvertimeInKst(now = new Date()) {
+  const formatter = new Intl.DateTimeFormat("en-US", {
+    timeZone: "Asia/Seoul",
+    weekday: "short",
+    hour: "2-digit",
+    minute: "2-digit",
+    hour12: false,
+  });
+  const parts = formatter.formatToParts(now);
+  const partMap = new Map(parts.map((part) => [part.type, part.value]));
+  const weekday = partMap.get("weekday");
+
+  if (weekday === "Sat" || weekday === "Sun") {
+    return false;
+  }
+
+  const hour = Number(partMap.get("hour") ?? "0");
+  const minute = Number(partMap.get("minute") ?? "0");
+  const totalMinutes = hour * 60 + minute;
+
+  return totalMinutes >= 16 * 60 && totalMinutes < 18 * 60;
+}
+
+/**
+ * @description 마켓/시간대에 맞는 국내주식 호가 TR ID를 반환합니다.
+ * @see .tmp/open-trading-api/examples_user/domestic_stock/domestic_stock_functions_ws.py asking_price_krx(H0STASP0), overtime_asking_price_krx(H0STOAA0) 기준
+ */
+function resolveOrderBookTrId(market: "KOSPI" | "KOSDAQ" | undefined) {
+  if (market === "KOSPI" || market === "KOSDAQ") {
+    return isKrxOvertimeInKst()
+      ? KRX_OVERTIME_ORDERBOOK_TR_ID
+      : KRX_ORDERBOOK_TR_ID;
+  }
+
+  return DEFAULT_ORDERBOOK_TR_ID;
+}
+
+/**
+ * @description KIS 실시간 호가 웹소켓 훅
+ * @see .tmp/open-trading-api/examples_user/domestic_stock/domestic_stock_functions_ws.py KRX 호가(H0STASP0) / 통합 호가(H0UNASP0) 기준
+ */
+export function useKisOrderbookWebSocket(
+  symbol: string | undefined,
+  market: "KOSPI" | "KOSDAQ" | undefined,
+  credentials: KisRuntimeCredentials | null,
+  isVerified: boolean,
+) {
+  const [realtimeOrderBook, setRealtimeOrderBook] =
+    useState<DashboardStockOrderBookResponse | null>(null);
+  const [isConnected, setIsConnected] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+
+  const socketRef = useRef<WebSocket | null>(null);
+  const approvalKeyRef = useRef<string | null>(null);
+
+  const trId = resolveOrderBookTrId(market);
+
+  useEffect(() => {
+    // 종목 변경 시 이전 호가 데이터 즉시 초기화
+    setRealtimeOrderBook(null);
+    setError(null);
+
+    if (!symbol || !isVerified || !credentials) {
+      socketRef.current?.close();
+      socketRef.current = null;
+      approvalKeyRef.current = null;
+      return;
+    }
+
+    let disposed = false;
+    let socket: WebSocket | null = null;
+
+    const connect = async () => {
+      try {
+        const approvalKey = await useKisRuntimeStore
+          .getState()
+          .getOrFetchApprovalKey();
+
+        if (!approvalKey) {
+          throw new Error("웹소켓 승인키 발급에 실패했습니다.");
+        }
+        if (disposed) return;
+
+        approvalKeyRef.current = approvalKey;
+        const wsBaseUrl =
+          process.env.NEXT_PUBLIC_KIS_WS_URL ||
+          "ws://ops.koreainvestment.com:21000";
+        socket = new WebSocket(`${wsBaseUrl}/tryitout/${trId}`);
+        socketRef.current = socket;
+
+        socket.onopen = () => {
+          if (disposed || !approvalKeyRef.current) return;
+
+          const subscribeMessage = buildKisRealtimeMessage(
+            approvalKeyRef.current,
+            symbol,
+            trId,
+            "1",
+          );
+          socket?.send(JSON.stringify(subscribeMessage));
+          setIsConnected(true);
+        };
+
+        socket.onmessage = (event) => {
+          if (disposed || typeof event.data !== "string") return;
+
+          const orderbook = parseKisRealtimeOrderbook(event.data, symbol);
+          if (!orderbook) return;
+
+          orderbook.tradingEnv = credentials.tradingEnv;
+          setRealtimeOrderBook(orderbook);
+        };
+
+        socket.onerror = (event) => {
+          if (disposed) return;
+          setIsConnected(false);
+          console.error("WebSocket Error:", event);
+        };
+
+        socket.onclose = () => {
+          if (disposed) return;
+          setIsConnected(false);
+        };
+      } catch (err) {
+        if (disposed) return;
+        setError(
+          err instanceof Error
+            ? err.message
+            : "실시간 호가 소켓 초기화 중 오류가 발생했습니다.",
+        );
+        setIsConnected(false);
+      }
+    };
+
+    void connect();
+
+    return () => {
+      disposed = true;
+      setIsConnected(false);
+
+      const approvalKey = approvalKeyRef.current;
+      if (socket?.readyState === WebSocket.OPEN && approvalKey) {
+        const unsubscribeMessage = buildKisRealtimeMessage(
+          approvalKey,
+          symbol,
+          trId,
+          "2",
+        );
+        socket.send(JSON.stringify(unsubscribeMessage));
+      }
+
+      socket?.close();
+      if (socketRef.current === socket) {
+        socketRef.current = null;
+      }
+      approvalKeyRef.current = null;
+    };
+  }, [isVerified, symbol, market, credentials, trId]);
+
+  return {
+    realtimeOrderBook,
+    isConnected,
+    error,
+  };
+}

features/dashboard/hooks/useKisTradeWebSocket.ts

@@ -0,0 +1,283 @@
+import { useEffect, useRef, useState } from "react";
+import {
+  type KisRuntimeCredentials,
+  useKisRuntimeStore,
+} from "@/features/dashboard/store/use-kis-runtime-store";
+import type {
+  DashboardRealtimeTradeTick,
+  StockCandlePoint,
+} from "@/features/dashboard/types/dashboard.types";
+import {
+  appendRealtimeTick,
+  buildKisRealtimeMessage,
+  parseKisRealtimeTickBatch,
+  toTickOrderValue,
+} from "@/features/dashboard/utils/kis-realtime.utils";
+
+const KIS_REALTIME_TR_ID_REAL = "H0STCNT0";
+const KIS_REALTIME_TR_ID_OVERTIME = "H0STOUP0"; // 시간외 단일가
+const KIS_REALTIME_TR_ID_MOCK = "H0STCNT0";
+
+const MAX_TRADE_TICKS = 10; // 체결 테이프용 최대 개수
+
+function resolveRealtimeTrId(tradingEnv: KisRuntimeCredentials["tradingEnv"]) {
+  if (tradingEnv === "mock") return KIS_REALTIME_TR_ID_MOCK;
+
+  // 현재 시간(KST) 체크 - 사용자 브라우저 시간 기준
+  const now = new Date();
+  const hours = now.getHours();
+  const minutes = now.getMinutes();
+  const time = hours * 100 + minutes;
+
+  // 16:00 ~ 18:00 사이는 시간외 단일가 TR ID 사용
+  if (time >= 1600 && time < 1800) {
+    return KIS_REALTIME_TR_ID_OVERTIME;
+  }
+
+  return KIS_REALTIME_TR_ID_REAL;
+}
+
+/**
+ * @description 통합 실시간 체결 웹소켓 훅 (H0STCNT0)
+ * - StockHeader: 실시간 현재가, 등락률, 시가/고가/저가/거래량
+ * - StockLineChart: 실시간 캔들 (분봉/일봉 등)
+ * - OrderBook (TradeTape): 최근 체결 내역 리스트
+ */
+export function useKisTradeWebSocket(
+  symbol: string | undefined,
+  credentials: KisRuntimeCredentials | null,
+  isVerified: boolean,
+  onTick?: (tick: DashboardRealtimeTradeTick) => void,
+) {
+  // 1. StockHeader용 최신 데이터
+  const [latestTick, setLatestTick] =
+    useState<DashboardRealtimeTradeTick | null>(null);
+
+  // 2. StockLineChart용 캔들 데이터
+  const [realtimeCandles, setRealtimeCandles] = useState<StockCandlePoint[]>(
+    [],
+  );
+
+  // 3. TradeTape용 최근 체결 리스트
+  const [recentTradeTicks, setRecentTradeTicks] = useState<
+    DashboardRealtimeTradeTick[]
+  >([]);
+
+  // 연결 상태
+  const [isConnected, setIsConnected] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+  const [lastTickAt, setLastTickAt] = useState<number | null>(null);
+
+  const socketRef = useRef<WebSocket | null>(null);
+  const approvalKeyRef = useRef<string | null>(null);
+  const lastTickOrderRef = useRef<number>(-1);
+  const seenTickRef = useRef<Set<string>>(new Set());
+
+  const realtimeTrId = credentials
+    ? resolveRealtimeTrId(credentials.tradingEnv)
+    : null;
+
+  // 데이터 없음 감지 (8초)
+  useEffect(() => {
+    if (!isConnected || lastTickAt) return;
+
+    const noTickTimer = window.setTimeout(() => {
+      setError(
+        "실시간 연결은 되었지만 체결 데이터가 없습니다. 장중(09:00~15:30)인지 확인해 주세요.",
+      );
+    }, 8000);
+
+    return () => {
+      window.clearTimeout(noTickTimer);
+    };
+  }, [isConnected, lastTickAt]);
+
+  // 웹소켓 연결 로직
+  useEffect(() => {
+    // 초기화
+    setLatestTick(null);
+    setRealtimeCandles([]);
+    setRecentTradeTicks([]);
+    setError(null);
+    seenTickRef.current.clear();
+
+    if (!symbol || !isVerified || !credentials) {
+      if (socketRef.current) {
+        socketRef.current.close();
+        socketRef.current = null;
+      }
+      approvalKeyRef.current = null;
+      setIsConnected(false);
+      return;
+    }
+
+    let disposed = false;
+    let socket: WebSocket | null = null;
+    const trId = resolveRealtimeTrId(credentials.tradingEnv);
+
+    const connect = async () => {
+      try {
+        setError(null);
+        setIsConnected(false);
+
+        const approvalKey = await useKisRuntimeStore
+          .getState()
+          .getOrFetchApprovalKey();
+
+        if (!approvalKey) {
+          throw new Error("웹소켓 승인키 발급에 실패했습니다.");
+        }
+        if (disposed) return;
+
+        approvalKeyRef.current = approvalKey;
+
+        const wsBaseUrl =
+          process.env.NEXT_PUBLIC_KIS_WS_URL ||
+          "ws://ops.koreainvestment.com:21000";
+        socket = new WebSocket(`${wsBaseUrl}/tryitout/${trId}`);
+        socketRef.current = socket;
+
+        console.log("[WS URL]", `${wsBaseUrl}/tryitout/${trId}`);
+
+        socket.onopen = () => {
+          if (disposed || !approvalKeyRef.current) return;
+          console.log("[WS Open] Connected");
+
+          const subscribeMessage = buildKisRealtimeMessage(
+            approvalKeyRef.current,
+            symbol,
+            trId,
+            "1",
+          );
+          socket?.send(JSON.stringify(subscribeMessage));
+          setIsConnected(true);
+        };
+
+        socket.onmessage = (event) => {
+          if (disposed || typeof event.data !== "string") return;
+
+          const parsedTicks = parseKisRealtimeTickBatch(event.data, symbol);
+
+          if (parsedTicks.length === 0) {
+            console.log(
+              "[WS Parsed] No ticks found. Check TrId/Symbol match.",
+              { symbol, trId },
+            );
+            return;
+          }
+
+          // 1. 데이터 정제 및 중복 제거 (TradeTape용)
+          const meaningfulTicks = parsedTicks.filter(
+            (tick) => tick.tradeVolume > 0,
+          );
+          const dedupedForTape = meaningfulTicks.filter((tick) => {
+            const key = `${tick.tickTime}-${tick.price}-${tick.tradeVolume}`;
+            if (seenTickRef.current.has(key)) return false;
+            seenTickRef.current.add(key);
+            return true;
+          });
+
+          // 2. 최신 틱 업데이트 (StockHeader용)
+          // 배치 중 가장 마지막(최신) 틱을 사용
+          const lastTickInBatch = parsedTicks[parsedTicks.length - 1];
+          setLatestTick(lastTickInBatch);
+
+          // 3. 캔들 업데이트 (StockLineChart용)
+          // 지연 도착 틱 필터링
+          const nextTickOrder = toTickOrderValue(lastTickInBatch.tickTime);
+          if (nextTickOrder > 0) {
+            if (lastTickOrderRef.current <= nextTickOrder) {
+              lastTickOrderRef.current = nextTickOrder;
+              const candlePoint: StockCandlePoint = {
+                time: formatTime(lastTickInBatch.tickTime),
+                price: lastTickInBatch.price,
+                // 필요한 경우 open, high, low, volume 등을 여기서 조합 가능
+                // 현재 차트 컴포넌트는 Point 단위로 price만 주로 씀
+              };
+              setRealtimeCandles((prev) =>
+                appendRealtimeTick(prev, candlePoint),
+              );
+            }
+          }
+
+          // 4. 체결 테이프 업데이트
+          if (dedupedForTape.length > 0) {
+            setRecentTradeTicks((prev) =>
+              [...dedupedForTape.reverse(), ...prev].slice(0, MAX_TRADE_TICKS),
+            );
+          }
+
+          // 5. 콜백 및 상태 업데이트
+          setError(null);
+          setLastTickAt(Date.now());
+
+          // onTick 콜백용 데이터 구성
+          if (onTick) {
+            onTick(lastTickInBatch);
+          }
+        };
+
+        socket.onerror = () => {
+          if (disposed) return;
+          setIsConnected(false);
+          // setError("실시간 체결 연결 중 오류가 발생했습니다.");
+        };
+
+        socket.onclose = () => {
+          if (disposed) return;
+          setIsConnected(false);
+        };
+      } catch (err) {
+        if (disposed) return;
+        const message =
+          err instanceof Error
+            ? err.message
+            : "실시간 웹소켓 초기화 중 오류가 발생했습니다.";
+        setError(message);
+        setIsConnected(false);
+      }
+    };
+
+    void connect();
+
+    const seenTickRefCurrent = seenTickRef.current;
+
+    return () => {
+      disposed = true;
+      setIsConnected(false);
+
+      const approvalKey = approvalKeyRef.current;
+      if (socket?.readyState === WebSocket.OPEN && approvalKey) {
+        const unsubscribeMessage = buildKisRealtimeMessage(
+          approvalKey,
+          symbol,
+          trId,
+          "2",
+        );
+        socket.send(JSON.stringify(unsubscribeMessage));
+      }
+
+      socket?.close();
+      if (socketRef.current === socket) {
+        socketRef.current = null;
+      }
+      approvalKeyRef.current = null;
+      seenTickRefCurrent.clear();
+    };
+  }, [isVerified, symbol, credentials, onTick]);
+
+  return {
+    latestTick, // Header용
+    realtimeCandles, // Chart용
+    recentTradeTicks, // Tape용
+    isConnected,
+    error,
+    lastTickAt,
+    realtimeTrId: realtimeTrId ?? KIS_REALTIME_TR_ID_REAL,
+  };
+}
+
+function formatTime(hhmmss: string) {
+  if (!hhmmss || hhmmss.length !== 6) return "실시간";
+  return `${hhmmss.slice(0, 2)}:${hhmmss.slice(2, 4)}:${hhmmss.slice(4, 6)}`;
+}

features/dashboard/hooks/useOrder.ts

@@ -0,0 +1,61 @@
+import { useState, useCallback } from "react";
+import type { KisRuntimeCredentials } from "@/features/dashboard/store/use-kis-runtime-store";
+import type {
+  DashboardStockCashOrderRequest,
+  DashboardStockCashOrderResponse,
+} from "@/features/dashboard/types/dashboard.types";
+import { fetchOrderCash } from "@/features/dashboard/apis/kis-stock.api";
+
+export function useOrder() {
+  const [isLoading, setIsLoading] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+  const [result, setResult] = useState<DashboardStockCashOrderResponse | null>(
+    null,
+  );
+
+  const placeOrder = useCallback(
+    async (
+      request: DashboardStockCashOrderRequest,
+      credentials: KisRuntimeCredentials | null,
+    ) => {
+      if (!credentials) {
+        setError("KIS API 자격 증명이 없습니다.");
+        return null;
+      }
+
+      setIsLoading(true);
+      setError(null);
+      setResult(null);
+
+      try {
+        const data = await fetchOrderCash(request, credentials);
+        setResult(data);
+        return data;
+      } catch (err) {
+        const message =
+          err instanceof Error
+            ? err.message
+            : "주문 처리 중 오류가 발생했습니다.";
+        setError(message);
+        return null;
+      } finally {
+        setIsLoading(false);
+      }
+    },
+    [],
+  );
+
+  const reset = useCallback(() => {
+    setError(null);
+    setResult(null);
+    setIsLoading(false);
+  }, []);
+
+  return {
+    placeOrder,
+    isLoading,
+    error,
+    result,
+    reset,
+  };
+}

features/dashboard/hooks/useOrderBook.ts

@@ -0,0 +1,115 @@
+import { useEffect, useRef, useState } from "react";
+import type { KisRuntimeCredentials } from "@/features/dashboard/store/use-kis-runtime-store";
+import type { DashboardStockOrderBookResponse } from "@/features/dashboard/types/dashboard.types";
+import { fetchStockOrderBook } from "@/features/dashboard/apis/kis-stock.api";
+import { useKisOrderbookWebSocket } from "@/features/dashboard/hooks/useKisOrderbookWebSocket";
+import { toast } from "sonner";
+
+/**
+ * @description 선택한 종목의 초기 호가를 조회하고 실시간 호가로 갱신합니다.
+ * @see features/dashboard/components/orderbook/OrderBook.tsx 호가창 화면에서 사용합니다.
+ */
+export function useOrderBook(
+  symbol: string | undefined,
+  market: "KOSPI" | "KOSDAQ" | undefined,
+  credentials: KisRuntimeCredentials | null,
+  isVerified: boolean,
+  options: { enabled?: boolean } = {},
+) {
+  const { enabled = true } = options;
+  const isRequestEnabled = enabled && !!symbol && !!credentials;
+  const requestSeqRef = useRef(0);
+  const lastErrorToastRef = useRef<string>("");
+
+  const [initialData, setInitialData] =
+    useState<DashboardStockOrderBookResponse | null>(null);
+  const [isLoading, setIsLoading] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+
+  useEffect(() => {
+    if (!isRequestEnabled || !symbol || !credentials) {
+      return;
+    }
+
+    const requestSeq = ++requestSeqRef.current;
+    let isDisposed = false;
+
+    const loadInitialOrderBook = async () => {
+      setInitialData(null);
+      setIsLoading(true);
+      setError(null);
+
+      try {
+        const data = await fetchStockOrderBook(symbol, credentials);
+        if (isDisposed || requestSeq !== requestSeqRef.current) return;
+        setInitialData(data);
+      } catch (err) {
+        if (isDisposed || requestSeq !== requestSeqRef.current) return;
+        console.error("Failed to fetch initial orderbook:", err);
+        const message =
+          err instanceof Error
+            ? err.message
+            : "호가 정보를 불러오지 못했습니다. 잠시 후 다시 시도해 주세요.";
+        setError(message);
+        if (lastErrorToastRef.current !== message) {
+          lastErrorToastRef.current = message;
+          toast.error(message);
+        }
+      } finally {
+        if (isDisposed || requestSeq !== requestSeqRef.current) return;
+        setIsLoading(false);
+      }
+    };
+
+    void loadInitialOrderBook();
+
+    return () => {
+      isDisposed = true;
+    };
+  }, [isRequestEnabled, symbol, credentials]);
+
+  const {
+    realtimeOrderBook,
+    isConnected: isWsConnected,
+    error: wsError,
+  } = useKisOrderbookWebSocket(
+    symbol,
+    market,
+    credentials,
+    isVerified && enabled,
+  );
+
+  // 실시간 패킷이 0값으로 들어오는 경우에는 초기 REST 호가를 유지합니다.
+  const safeRealtimeOrderBook = isUsableOrderBook(realtimeOrderBook)
+    ? realtimeOrderBook
+    : null;
+  const orderBook = isRequestEnabled
+    ? (safeRealtimeOrderBook ?? initialData)
+    : null;
+  const mergedError = isRequestEnabled ? error || wsError : null;
+  const mergedLoading = isRequestEnabled ? isLoading && !orderBook : false;
+
+  return {
+    orderBook,
+    isLoading: mergedLoading,
+    error: mergedError,
+    isWsConnected,
+  };
+}
+
+/**
+ * @description 호가 데이터가 실제 유효한지(0만 있는지) 판별합니다.
+ * @see features/dashboard/hooks/useOrderBook.ts 실시간/초기 호가 병합 우선순위 결정에 사용합니다.
+ */
+function isUsableOrderBook(orderBook: DashboardStockOrderBookResponse | null) {
+  if (!orderBook) return false;
+  if (orderBook.totalAskSize > 0 || orderBook.totalBidSize > 0) return true;
+
+  return orderBook.levels.some(
+    (level) =>
+      level.askPrice > 0 ||
+      level.bidPrice > 0 ||
+      level.askSize > 0 ||
+      level.bidSize > 0,
+  );
+}

features/dashboard/hooks/useStockOverview.ts

@@ -0,0 +1,118 @@
+import { useCallback, useState, useTransition } from "react";
+import type { KisRuntimeCredentials } from "@/features/dashboard/store/use-kis-runtime-store";
+import type {
+  DashboardMarketPhase,
+  DashboardPriceSource,
+  DashboardRealtimeTradeTick,
+  DashboardStockSearchItem,
+  DashboardStockItem,
+} from "@/features/dashboard/types/dashboard.types";
+import { fetchStockOverview } from "@/features/dashboard/apis/kis-stock.api";
+
+interface OverviewMeta {
+  priceSource: DashboardPriceSource;
+  marketPhase: DashboardMarketPhase;
+  fetchedAt: string;
+}
+
+export function useStockOverview() {
+  const [selectedStock, setSelectedStock] = useState<DashboardStockItem | null>(
+    null,
+  );
+  const [meta, setMeta] = useState<OverviewMeta | null>(null);
+  const [error, setError] = useState<string | null>(null);
+  const [isLoading, startTransition] = useTransition();
+
+  const loadOverview = useCallback(
+    (
+      symbol: string,
+      credentials: KisRuntimeCredentials | null,
+      marketHint?: DashboardStockSearchItem["market"],
+    ) => {
+      if (!credentials) return;
+
+      startTransition(async () => {
+        try {
+          setError(null);
+          const data = await fetchStockOverview(symbol, credentials);
+          setSelectedStock({
+            ...data.stock,
+            market: marketHint ?? data.stock.market,
+          });
+          setMeta({
+            priceSource: data.priceSource,
+            marketPhase: data.marketPhase,
+            fetchedAt: data.fetchedAt,
+          });
+        } catch (err) {
+          const message =
+            err instanceof Error
+              ? err.message
+              : "종목 조회 중 오류가 발생했습니다.";
+          setError(message);
+          setMeta(null);
+        }
+      });
+    },
+    [],
+  );
+
+  // 실시간 체결 데이터 수신 시 헤더/차트 기준 가격을 갱신합니다.
+  const updateRealtimeTradeTick = useCallback(
+    (tick: DashboardRealtimeTradeTick) => {
+      setSelectedStock((prev) => {
+        if (!prev) return prev;
+        const { price, accumulatedVolume, change, changeRate, tickTime } = tick;
+        const pointTime =
+          tickTime && tickTime.length === 6
+            ? `${tickTime.slice(0, 2)}:${tickTime.slice(2, 4)}`
+            : "실시간";
+
+        const nextChange = change;
+        const nextChangeRate = Number.isFinite(changeRate)
+          ? changeRate
+          : prev.prevClose > 0
+            ? (nextChange / prev.prevClose) * 100
+            : prev.changeRate;
+        const nextHigh = prev.high > 0 ? Math.max(prev.high, price) : price;
+        const nextLow = prev.low > 0 ? Math.min(prev.low, price) : price;
+        const nextCandles =
+          prev.candles.length > 0 &&
+          prev.candles[prev.candles.length - 1]?.time === pointTime
+            ? [
+                ...prev.candles.slice(0, -1),
+                {
+                  ...prev.candles[prev.candles.length - 1],
+                  time: pointTime,
+                  price,
+                },
+              ]
+            : [...prev.candles, { time: pointTime, price }].slice(-80);
+
+        return {
+          ...prev,
+          currentPrice: price,
+          change: nextChange,
+          changeRate: nextChangeRate,
+          high: nextHigh,
+          low: nextLow,
+          volume: accumulatedVolume > 0 ? accumulatedVolume : prev.volume,
+          candles: nextCandles,
+        };
+      });
+    },
+    [],
+  );
+
+  return {
+    selectedStock,
+    setSelectedStock,
+    meta,
+    setMeta,
+    error,
+    setError,
+    isLoading,
+    loadOverview,
+    updateRealtimeTradeTick,
+  };
+}

features/dashboard/hooks/useStockSearch.ts

@@ -0,0 +1,91 @@
+import { useCallback, useRef, useState } from "react";
+import type { KisRuntimeCredentials } from "@/features/dashboard/store/use-kis-runtime-store";
+import type { DashboardStockSearchItem } from "@/features/dashboard/types/dashboard.types";
+import { fetchStockSearch } from "@/features/dashboard/apis/kis-stock.api";
+
+export function useStockSearch() {
+  const [keyword, setKeyword] = useState("삼성전자");
+  const [searchResults, setSearchResults] = useState<
+    DashboardStockSearchItem[]
+  >([]);
+  const [error, setError] = useState<string | null>(null);
+  const [isSearching, setIsSearching] = useState(false);
+  const requestIdRef = useRef(0);
+  const abortRef = useRef<AbortController | null>(null);
+
+  const loadSearch = useCallback(async (query: string) => {
+    const requestId = ++requestIdRef.current;
+    const controller = new AbortController();
+    abortRef.current?.abort();
+    abortRef.current = controller;
+
+    setIsSearching(true);
+    setError(null);
+
+    try {
+      const data = await fetchStockSearch(query, controller.signal);
+      if (requestId === requestIdRef.current) {
+        setSearchResults(data.items);
+      }
+      return data.items;
+    } catch (err) {
+      if (controller.signal.aborted) {
+        return [];
+      }
+      if (requestId === requestIdRef.current) {
+        setError(
+          err instanceof Error
+            ? err.message
+            : "종목 검색 중 오류가 발생했습니다.",
+        );
+      }
+      return [];
+    } finally {
+      if (requestId === requestIdRef.current) {
+        setIsSearching(false);
+      }
+    }
+  }, []);
+
+  const search = useCallback(
+    (query: string, credentials: KisRuntimeCredentials | null) => {
+      if (!credentials) {
+        setError("API 키 검증이 필요합니다.");
+        setSearchResults([]);
+        setIsSearching(false);
+        return;
+      }
+
+      const trimmed = query.trim();
+      if (!trimmed) {
+        abortRef.current?.abort();
+        setSearchResults([]);
+        setError(null);
+        setIsSearching(false);
+        return;
+      }
+
+      void loadSearch(trimmed);
+    },
+    [loadSearch],
+  );
+
+  const clearSearch = useCallback(() => {
+    abortRef.current?.abort();
+    setSearchResults([]);
+    setError(null);
+    setIsSearching(false);
+  }, []);
+
+  return {
+    keyword,
+    setKeyword,
+    searchResults,
+    setSearchResults,
+    error,
+    setError,
+    isSearching,
+    search,
+    clearSearch,
+  };
+}