const DECIMAL_PART_COUNT = 2;
const CENTS_PRECISION = 2;

type FormatMoneyOptions = {
	withZeroCents?: boolean;
};

type Money = { currency: string; value: string };

const dateFormatter = new Intl.DateTimeFormat("ru-RU", {
	day: "2-digit",
	month: "2-digit",
	timeZone: "UTC",
	year: "numeric",
});

function formatDate(value: string): string {
	return dateFormatter.format(new Date(value));
}

function formatDecimal(value: string): string {
	const [integer = "", fraction] = value.split(".", DECIMAL_PART_COUNT);
	const sign = integer.startsWith("-") ? "-" : "";
	const digits = sign ? integer.slice(1) : integer;
	const groupSize = 3;
	const groups: string[] = [];

	for (let end = digits.length; end > 0; end -= groupSize) {
		groups.push(digits.slice(Math.max(0, end - groupSize), end));
	}

	const grouped = groups.toReversed().join(" ");
	const suffix = fraction ? `,${fraction}` : "";

	return `${sign}${grouped}${suffix}`;
}

function formatMoney(
	money: Money
		| null
		| undefined,
	{ withZeroCents = false }: FormatMoneyOptions = {},
): string {
	if (!money) return "—";

	const [integerPart = "", fractionPart = ""] = money.value.split(
		".",
		DECIMAL_PART_COUNT,
	);

	const normalizedFraction = withZeroCents
		? fractionPart.padEnd(CENTS_PRECISION, "0")
		: fractionPart;

	const decimal = normalizedFraction
		? `${integerPart}.${normalizedFraction}`
		: integerPart;

	const currency = money.currency === "RUB" ? "₽" : money.currency;

	return `${formatDecimal(decimal)} ${currency}`;
}

const snapshotFormatter = new Intl.DateTimeFormat("ru-RU", {
	dateStyle: "short",
	timeStyle: "short",
	timeZone: "UTC",
});

function formatSnapshotTime(value: string): string {
	return snapshotFormatter.format(new Date(value));
}

const logoSize = 160;

const chartFormatter = new Intl.NumberFormat("ru-RU", { maximumFractionDigits: 4 });

function formatChartValue(value: number) {
	return chartFormatter.format(value);
}

function instrumentLogoUrl(logoName?: null | string): null | string {
	const stem = logoName?.trim().replace(/\.png$/i, "");

	return stem
		? `https://invest-brands.cdn-tinkoff.ru/${stem}x${logoSize}.png`
		: null;
}

export {
	formatChartValue,
	formatDate,
	formatDecimal,
	formatMoney,
	formatSnapshotTime,
	instrumentLogoUrl,
};