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import { toDate } from "./toDate.mjs";
import { getDefaultOptions } from "./_lib/defaultOptions.mjs";

/**
 * The {@link lastDayOfWeek} function options.
 */

/**
 * @name lastDayOfWeek
 * @category Week Helpers
 * @summary Return the last day of a week for the given date.
 *
 * @description
 * Return the last day of a week for the given date.
 * The result will be in the local timezone.
 *
 * @typeParam DateType - The `Date` type, the function operates on. Gets inferred from passed arguments. Allows to use extensions like [`UTCDate`](https://github.com/date-fns/utc).
 *
 * @param date - The original date
 * @param options - An object with options
 *
 * @returns The last day of a week
 *
 * @example
 * // The last day of a week for 2 September 2014 11:55:00:
 * const result = lastDayOfWeek(new Date(2014, 8, 2, 11, 55, 0))
 * //=> Sat Sep 06 2014 00:00:00
 *
 * @example
 * // If the week starts on Monday, the last day of the week for 2 September 2014 11:55:00:
 * const result = lastDayOfWeek(new Date(2014, 8, 2, 11, 55, 0), { weekStartsOn: 1 })
 * //=> Sun Sep 07 2014 00:00:00
 */
export function lastDayOfWeek(date, options) {
  const defaultOptions = getDefaultOptions();
  const weekStartsOn =
    options?.weekStartsOn ??
    options?.locale?.options?.weekStartsOn ??
    defaultOptions.weekStartsOn ??
    defaultOptions.locale?.options?.weekStartsOn ??
    0;

  const _date = toDate(date);
  const day = _date.getDay();
  const diff = (day < weekStartsOn ? -7 : 0) + 6 - (day - weekStartsOn);

  _date.setHours(0, 0, 0, 0);
  _date.setDate(_date.getDate() + diff);
  return _date;
}

// Fallback for modularized imports:
export default lastDayOfWeek;