refactor!: support RUB only (WealthLedger/main#55) (#168)

src/pages/account/model/positions.ts

@@ -249,37 +249,23 @@ function toSection(
 
 function toUnrealizedReturns(
 	positions: Portfolio["positions"],
-): Money[] {
-	const totals = new Map<string, {
-		complete: boolean;
-		values: Decimal[];
-	}>();
+): Money | null {
+	const values: Decimal[] = [];
 
 	for (const position of positions) {
-		const currencies = position.absoluteReturn
-			? [position.absoluteReturn.currency]
-			: [...new Set([
-					position.averagePurchasePrice?.currency,
-					position.currentValue?.currency,
-				].filter((currency): currency is string => !!currency))];
+		if (!position.absoluteReturn) {
+			// A position without any valuation has nothing to contribute.
 
-		for (const currency of currencies) {
-			const total = totals.get(currency) ?? { complete: true, values: [] };
+			if (!position.averagePurchasePrice && !position.currentValue)
+				continue;
 
-			if (position.absoluteReturn) {
-				total.values.push(decimalFromString(position.absoluteReturn.value));
-			}
-			else {
-				total.complete = false;
-			}
-
-			totals.set(currency, total);
+			return null;
 		}
+
+		values.push(decimalFromString(position.absoluteReturn.value));
 	}
 
-	return [...totals].flatMap(([currency, total]) => total.complete
-		? [{ currency, value: decimalToString(sumDecimals(total.values)) }]
-		: []);
+	return { currency: "RUB", value: decimalToString(sumDecimals(values)) };
 }
 
 export {