import { startOfWeek } from './startOfWeek.js';

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

/**
 * @name startOfISOWeek
 * @category ISO Week Helpers
 * @summary Return the start of an ISO week for the given date.
 *
 * @description
 * Return the start of an ISO week for the given date.
 * The result will be in the local timezone.
 *
 * ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date
 *
 * @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).
 * @typeParam ResultDate - The result `Date` type, it is the type returned from the context function if it is passed, or inferred from the arguments.
 *
 * @param date - The original date
 * @param options - An object with options
 *
 * @returns The start of an ISO week
 *
 * @example
 * // The start of an ISO week for 2 September 2014 11:55:00:
 * const result = startOfISOWeek(new Date(2014, 8, 2, 11, 55, 0))
 * //=> Mon Sep 01 2014 00:00:00
 */
function startOfISOWeek(date, options) {
  return startOfWeek(date, { ...options, weekStartsOn: 1 });
}

export { startOfISOWeek as default, startOfISOWeek };
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