refactor: centralize provider projections

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

@@ -1,16 +1,110 @@
 import type { Money } from '../../../../common/money.types';
+import type { PortfolioDto, PortfolioPositionDto } from '../presentation/portfolio.dto';
 
 import {
   add,
+  decimalFromString,
   formatDecimal,
   isZero,
   multiply,
+  subtract,
 } from '../../../../common/decimal';
 import { decimal } from '../../../../integrations/tbank/decimal';
 import {
+  metadataKey,
+  type TbankInstrument,
+  type TbankMoney,
   TbankPortfolio,
   TbankPositions,
 } from '../../../../integrations/tbank/tbank.api';
+import { portfolioStructure } from '../domain/portfolio-structure';
+
+const types: Record<string, string> = {
+  share: 'STOCK',
+  bond: 'BOND',
+  etf: 'FUND',
+  currency: 'CURRENCY',
+  futures: 'FUTURE',
+  option: 'OPTION',
+  sp: 'STRUCTURED_NOTE',
+  dfa: 'DIGITAL_FINANCIAL_ASSET',
+};
+
+function mapPortfolio(
+  upstream: NonNullable<TbankPortfolio['positions']>,
+  cash: TbankMoney[],
+  metadata: ReadonlyMap<string, { data?: null | TbankInstrument }>,
+  lastSuccessfulAt: string,
+): PortfolioDto {
+  const positions = upstream
+    .map((position) => mapPosition(position, metadata.get(metadataKey(position))?.data ?? null))
+    .filter((position): position is PortfolioPositionDto => position !== null);
+  const balances = new Map<string, ReturnType<typeof decimal>>();
+  for (const value of cash) {
+    const currency = value.currency?.trim().toUpperCase();
+    const amount = decimal(value);
+    if (!currency || isZero(amount)) continue;
+    balances.set(currency, add(balances.get(currency) ?? decimal({}), amount));
+  }
+  const cashBalances = [...balances].map(([currency, value]) => ({
+    currency,
+    value: formatDecimal(value),
+  }));
+  return {
+    lastSuccessfulAt,
+    isStale: false,
+    totalsByCurrency: totalsByCurrency(upstream, cash),
+    positions,
+    cashBalances,
+    structure: portfolioStructure(positions, cashBalances),
+  };
+}
+
+function mapPosition(
+  position: NonNullable<TbankPortfolio['positions']>[number],
+  metadata: null | TbankInstrument,
+): null | PortfolioPositionDto {
+  const quantity = decimal(position.quantity ?? {});
+  if (isZero(quantity)) return null;
+  const figi = position.figi?.trim() || null;
+  const instrumentUid = position.instrumentUid?.trim() || null;
+  const currentPrice = money(position.currentPrice);
+  const averagePurchasePrice = money(position.averagePositionPrice);
+  const currentValue = currentPrice && {
+    currency: currentPrice.currency,
+    value: formatDecimal(multiply(quantity, decimalFromString(currentPrice.value))),
+  };
+  const absoluteReturn =
+    currentPrice && averagePurchasePrice && currentPrice.currency === averagePurchasePrice.currency
+      ? {
+          currency: currentPrice.currency,
+          value: formatDecimal(multiply(
+            subtract(decimalFromString(currentPrice.value), decimalFromString(averagePurchasePrice.value)),
+            quantity,
+          )),
+        }
+      : null;
+  return {
+    figi,
+    instrumentUid,
+    displayName: metadata?.name?.trim() || metadata?.ticker?.trim() || figi || 'Unknown instrument',
+    type: types[position.instrumentType?.toLowerCase() ?? ''] ?? 'OTHER',
+    quantity: formatDecimal(quantity),
+    currentValue,
+    averagePurchasePrice,
+    absoluteReturn,
+    isin: metadata?.isin?.trim() || null,
+    ticker: metadata?.ticker?.trim() || null,
+    logoName: metadata?.brand?.logoName?.trim() || null,
+  };
+}
+
+function money(value: TbankMoney | undefined): Money | null {
+  const currency = value?.currency?.trim().toUpperCase();
+  return currency && value
+    ? { currency, value: formatDecimal(decimal(value)) }
+    : null;
+}
 
 function totalsByCurrency(
   positions: NonNullable<TbankPortfolio['positions']>,
@@ -44,4 +138,4 @@ function totalsByCurrency(
     .map(([currency, value]) => ({ currency, value: formatDecimal(value) }));
 }
 
-export { totalsByCurrency };
+export { mapPortfolio, totalsByCurrency };