feat: add portfolio

src/entities/portfolio/model/display.test.ts

@@ -0,0 +1,11 @@
+import { describe, expect, it } from "vitest";
+import { formatDecimal, formatMoney } from "./display";
+
+describe("portfolio display helpers", () => {
+	it("formats decimal strings without financial arithmetic", () => {
+		expect(formatDecimal("-1234567.89")).toBe("-1 234 567,89");
+		expect(formatMoney({ value: "10", currency: "RUB" })).toBe("10 ₽");
+		expect(formatMoney({ value: "0.5", currency: "USD" })).toBe("0,5 USD");
+		expect(formatMoney(null)).toBe("—");
+	});
+});

src/entities/portfolio/model/display.ts

@@ -0,0 +1,32 @@
+import type { Portfolio } from "../api/usePortfolio";
+
+type Money = Portfolio["totalsByCurrency"][number];
+
+export function formatDecimal(value: string): string {
+	const [integer, fraction] = value.split(".");
+	const sign = integer.startsWith("-") ? "-" : "";
+	const grouped = (sign ? integer.slice(1) : integer).replace(
+		/\B(?=(\d{3})+(?!\d))/g,
+		" ",
+	);
+	return `${sign}${grouped}${fraction ? `,${fraction}` : ""}`;
+}
+
+export function formatMoney(money: Money | null): string {
+	if (!money) return "—";
+	return `${formatDecimal(money.value)} ${money.currency === "RUB" ? "₽" : money.currency}`;
+}
+
+export function formatSnapshotTime(value: string): string {
+	return new Intl.DateTimeFormat("ru-RU", {
+		dateStyle: "medium",
+		timeStyle: "short",
+		timeZone: "UTC",
+	}).format(new Date(value));
+}
+
+export function portfolioErrorCode(error: unknown): string | undefined {
+	return typeof error === "object" && error !== null && "code" in error
+		? String(error.code)
+		: undefined;
+}