import type { DateLib } from "../classes/index.js";

import { getBroadcastWeeksInMonth } from "./getBroadcastWeeksInMonth.js";
import { startOfBroadcastWeek } from "./startOfBroadcastWeek.js";

/**
 * Returns the end date of the week in the broadcast calendar.
 *
 * The broadcast week ends on the last day of the last broadcast week for the
 * given date.
 *
 * @since 9.4.0
 * @param date The date for which to calculate the end of the broadcast week.
 * @param dateLib The date library to use for date manipulation.
 * @returns The end date of the broadcast week.
 */
export function endOfBroadcastWeek(date: Date, dateLib: DateLib): Date {
  const startDate = startOfBroadcastWeek(date, dateLib);
  const numberOfWeeks = getBroadcastWeeksInMonth(date, dateLib);
  const endDate = dateLib.addDays(startDate, numberOfWeeks * 7 - 1);
  return endDate;
}