feat(tbank): add brokerage account summaries

src/tbank/portfolio-totals.ts

@@ -0,0 +1,37 @@
+import { add, decimal, formatDecimal, isZero, multiply } from './decimal';
+import { MoneyDto } from './portfolio.dto';
+import { TbankPortfolio, TbankPositions } from './tbank.client';
+
+function totalsByCurrency(
+  positions: NonNullable<TbankPortfolio['positions']>,
+  money: NonNullable<TbankPositions['money']>,
+): MoneyDto[] {
+  const totals = new Map<string, ReturnType<typeof decimal>>();
+  const addTotal = (
+    currency: string | undefined,
+    amount: ReturnType<typeof decimal>,
+  ) => {
+    const normalizedCurrency = currency?.trim().toUpperCase();
+    if (!normalizedCurrency || isZero(amount)) return;
+    totals.set(
+      normalizedCurrency,
+      add(totals.get(normalizedCurrency) ?? decimal({}), amount),
+    );
+  };
+
+  for (const value of money) addTotal(value.currency, decimal(value));
+  for (const position of positions) {
+    const price = position.currentPrice;
+    if (!price) continue;
+    addTotal(
+      price.currency,
+      multiply(decimal(position.quantity ?? {}), decimal(price)),
+    );
+  }
+
+  return [...totals]
+    .filter(([, value]) => !isZero(value))
+    .map(([currency, value]) => ({ currency, value: formatDecimal(value) }));
+}
+
+export { totalsByCurrency };