import type { Portfolio } from "../api/usePortfolio";

type Money = Portfolio["totalsByCurrency"][number];

function formatShare(
	numerator: Money | null,
	denominator: Money | null,
): string | null {
	if (!numerator || !denominator) return null;
	const total = Number(denominator.value);
	if (!Number.isFinite(total) || total <= 0) return null;
	// biome-ignore lint/style/noMagicNumbers: obvious conversion of a ratio to percent.
	const percent = (Number(numerator.value) / total) * 100;
	if (!Number.isFinite(percent)) return null;
	const rounded = new Intl.NumberFormat("ru-RU", {
		maximumFractionDigits: 1,
	}).format(percent);
	return `${rounded} %`;
}

export { formatShare };