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features/trade/hooks/useCurrentPrice.ts

@@ -0,0 +1,53 @@
+import { useMemo } from "react";
+import type {
+  DashboardRealtimeTradeTick,
+  DashboardStockItem,
+  DashboardStockOrderBookResponse,
+} from "@/features/trade/types/trade.types";
+
+interface UseCurrentPriceParams {
+  stock?: DashboardStockItem | null;
+  latestTick: DashboardRealtimeTradeTick | null;
+  orderBook: DashboardStockOrderBookResponse | null;
+}
+
+export function useCurrentPrice({
+  stock,
+  latestTick,
+  orderBook,
+}: UseCurrentPriceParams) {
+  return useMemo(() => {
+    let currentPrice = stock?.currentPrice ?? 0;
+    let change = stock?.change ?? 0;
+    let changeRate = stock?.changeRate ?? 0;
+    const prevClose = stock?.prevClose ?? 0;
+
+    // 1. Priority: Realtime Tick (Trade WS)
+    if (latestTick?.price && latestTick.price > 0) {
+      currentPrice = latestTick.price;
+      change = latestTick.change;
+      changeRate = latestTick.changeRate;
+    }
+    // 2. Fallback: OrderBook Best Ask (Proxy for current price if no tick)
+    else if (
+      orderBook?.levels[0]?.askPrice &&
+      orderBook.levels[0].askPrice > 0
+    ) {
+      const askPrice = orderBook.levels[0].askPrice;
+      currentPrice = askPrice;
+
+      // Recalculate change/rate based on prevClose
+      if (prevClose > 0) {
+        change = currentPrice - prevClose;
+        changeRate = (change / prevClose) * 100;
+      }
+    }
+
+    return {
+      currentPrice,
+      change,
+      changeRate,
+      prevClose,
+    };
+  }, [stock, latestTick, orderBook]);
+}