import { z } from "zod";

import { bankMonth } from "./form-validation";

const calendarDate = z.iso.date();
const ISO_DATE_LENGTH = 10;
function bankPeriod(parameters: URLSearchParams) {
	const month = bankMonth(parameters.get("month"));
	const monthEnd = new Date(`${month}-01T00:00:00Z`);
	monthEnd.setUTCMonth(monthEnd.getUTCMonth() + 1, 0);
	const from = parameters.get("from");
	const to = parameters.get("to");
	return from
		&& to
		&& calendarDate.safeParse(from).success
		&& calendarDate.safeParse(to).success
		&& from >= "0001-01-01"
		&& from <= to
		? { from, to }
		: {
				from: `${month}-01`,
				to: monthEnd.toISOString().slice(0, ISO_DATE_LENGTH),
			};
}

export { bankPeriod };