refactor: organize backend by business responsibility

src/modules/investments/portfolio/infrastructure/tbank-portfolio.mapper.ts

@@ -0,0 +1,47 @@
+import {
+  add,
+  formatDecimal,
+  isZero,
+  multiply,
+} from '../../../../common/decimal';
+import type { Money } from '../../../../common/money.types';
+import { decimal } from '../../../../integrations/tbank/decimal';
+
+import {
+  TbankPortfolio,
+  TbankPositions,
+} from '../../../../integrations/tbank/tbank.api';
+
+function totalsByCurrency(
+  positions: NonNullable<TbankPortfolio['positions']>,
+  money: NonNullable<TbankPositions['money']>,
+): Money[] {
+  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 };