feat: add usePriceQuery hook with TanStack Query

src/queries/index.ts

@@ -13,3 +13,10 @@ export {
   useRefreshBalance,
   balanceQueryKeys,
 } from './use-balance-query'
+
+export {
+  usePriceQuery,
+  getPrice,
+  priceQueryKeys,
+  type PriceData,
+} from './use-price-query'

src/queries/use-price-query.ts

@@ -0,0 +1,89 @@
+import { useQuery } from '@tanstack/react-query'
+
+/** Price data for a single token */
+export interface PriceData {
+  priceUsd: number
+  priceChange24h: number
+  updatedAt: number
+}
+
+/** Mock price data for development */
+const MOCK_PRICES: Record<string, PriceData> = {
+  ETH: { priceUsd: 2500, priceChange24h: 2.3, updatedAt: Date.now() },
+  BTC: { priceUsd: 45000, priceChange24h: -1.5, updatedAt: Date.now() },
+  USDT: { priceUsd: 1, priceChange24h: 0.01, updatedAt: Date.now() },
+  USDC: { priceUsd: 1, priceChange24h: -0.02, updatedAt: Date.now() },
+  BFM: { priceUsd: 0.05, priceChange24h: 5.2, updatedAt: Date.now() },
+  TRX: { priceUsd: 0.12, priceChange24h: 3.1, updatedAt: Date.now() },
+  BNB: { priceUsd: 320, priceChange24h: 1.8, updatedAt: Date.now() },
+}
+
+/**
+ * Price Query Keys
+ */
+export const priceQueryKeys = {
+  all: ['prices'] as const,
+  symbols: (symbols: string[]) => ['prices', symbols.sort().join(',')] as const,
+}
+
+/**
+ * Fetch prices for given symbols
+ */
+async function fetchPrices(symbols: string[]): Promise<Map<string, PriceData>> {
+  const now = Date.now()
+
+  // TODO: Replace with actual API call (CoinGecko, etc.)
+  await new Promise((resolve) => setTimeout(resolve, 100))
+
+  const prices = new Map<string, PriceData>()
+  for (const symbol of symbols) {
+    const upperSymbol = symbol.toUpperCase()
+    const mockPrice = MOCK_PRICES[upperSymbol]
+    if (mockPrice) {
+      prices.set(upperSymbol, { ...mockPrice, updatedAt: now })
+    }
+  }
+
+  return prices
+}
+
+/**
+ * Price Query Hook
+ *
+ * 特性：
+ * - 5min staleTime：替代手动缓存
+ * - 60s 轮询：自动刷新价格
+ * - 共享缓存：多个组件使用同一 symbols 时共享数据
+ * - 请求去重：同时发起的相同请求会被合并
+ */
+export function usePriceQuery(symbols: string[]) {
+  const normalizedSymbols = symbols.map((s) => s.toUpperCase()).filter(Boolean)
+
+  const query = useQuery({
+    queryKey: priceQueryKeys.symbols(normalizedSymbols),
+    queryFn: () => fetchPrices(normalizedSymbols),
+    enabled: normalizedSymbols.length > 0,
+    staleTime: 5 * 60 * 1000, // 5 分钟内认为数据新鲜
+    gcTime: 10 * 60 * 1000, // 10 分钟缓存
+    refetchInterval: 60 * 1000, // 60 秒轮询
+    refetchIntervalInBackground: false,
+    refetchOnWindowFocus: true,
+  })
+
+  return {
+    prices: query.data ?? new Map<string, PriceData>(),
+    isLoading: query.isLoading,
+    isFetching: query.isFetching,
+    error: query.error?.message ?? null,
+  }
+}
+
+/**
+ * Get price for a single token from the prices map
+ */
+export function getPrice(
+  prices: Map<string, PriceData>,
+  symbol: string
+): PriceData | undefined {
+  return prices.get(symbol.toUpperCase())
+}