refactor(ledger): PnL 引擎接入动态汇率字典，实现跨币种资产的高精度法币折算

src/actions/portfolio.ts

@@ -1,9 +1,9 @@
 'use server';
 
 import { db } from '@/db';
-import { transactions, assets, exchangeRates } from '@/db/schema';
+import { transactions, assets, exchangeRates, exchangeRatesHistory } from '@/db/schema';
 import Big from 'big.js';
-import { asc, eq } from 'drizzle-orm';
+import { asc, desc, eq } from 'drizzle-orm';
 import { calculateAssetMetrics } from '@/utils/finance';
 
 interface Position {
@@ -64,6 +64,35 @@ interface RawRate {
   rate: string;
 }
 
+async function getLatestRatesMap(): Promise<Record<string, Big>> {
+  const usdResult = await db
+    .select({
+      rate: exchangeRatesHistory.rate,
+    })
+    .from(exchangeRatesHistory)
+    .where(eq(exchangeRatesHistory.fromCurrency, 'USD'))
+    .orderBy(desc(exchangeRatesHistory.fetchTime))
+    .limit(1);
+
+  const hkdResult = await db
+    .select({
+      rate: exchangeRatesHistory.rate,
+    })
+    .from(exchangeRatesHistory)
+    .where(eq(exchangeRatesHistory.fromCurrency, 'HKD'))
+    .orderBy(desc(exchangeRatesHistory.fetchTime))
+    .limit(1);
+
+  const dbUsd = usdResult[0];
+  const dbHkd = hkdResult[0];
+
+  return {
+    CNY: new Big(1),
+    USD: new Big(dbUsd?.rate || 7.2),
+    HKD: new Big(dbHkd?.rate || 0.9),
+  };
+}
+
 function buildRateMap(rates: RawRate[]): Map<string, string> {
   const map = new Map<string, string>();
   for (const r of rates) {
@@ -167,13 +196,14 @@ export async function getPortfolioPositions(): Promise<Position[]> {
     .leftJoin(assets, eq(assets.id, transactions.assetId))
     .orderBy(asc(transactions.executedAt));
 
-  const rates = await db.select({
-    fromCurrency: exchangeRates.fromCurrency,
-    toCurrency: exchangeRates.toCurrency,
-    rate: exchangeRates.rate,
-  }).from(exchangeRates);
+  const dynamicRateMap = await getLatestRatesMap();
 
-  const rateMap = buildRateMap(rates);
+  const rateMap = new Map<string, string>();
+  for (const [currency, rate] of Object.entries(dynamicRateMap)) {
+    if (currency !== 'CNY') {
+      rateMap.set(`${currency}_CNY`, rate.toString());
+    }
+  }
 
   const holdings = new Map<string, {
     assetId: string;
@@ -330,10 +360,9 @@ export async function getPortfolioPositions(): Promise<Position[]> {
       holding.latestPrice
     );
 
-    // 获取资产对人民币的汇率
-    const fxRate = new Big(
-      getRate(rateMap, holding.baseCurrency, 'CNY') || '1'
-    );
+    // 从动态汇率字典获取资产对人民币的汇率
+    const currencyKey = holding.baseCurrency || 'CNY';
+    const fxRate = dynamicRateMap[currencyKey] || new Big(1);
 
     // 将引擎返回的原生币种金额折算为 CNY
     const marketValueCny = new Big(metrics.marketValue).times(fxRate).toString();