import { getDefaultOptions } from "./_lib/defaultOptions.js";
import { toDate } from "./toDate.js";
/**
* The {@link startOfWeek} function options.
*/
/**
* @name startOfWeek
* @category Week Helpers
* @summary Return the start of a week for the given date.
*
* @description
* Return the start 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).
* @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 a week
*
* @example
* // The start of a week for 2 September 2014 11:55:00:
* const result = startOfWeek(new Date(2014, 8, 2, 11, 55, 0))
* //=> Sun Aug 31 2014 00:00:00
*
* @example
* // If the week starts on Monday, the start of the week for 2 September 2014 11:55:00:
* const result = startOfWeek(new Date(2014, 8, 2, 11, 55, 0), { weekStartsOn: 1 })
* //=> Mon Sep 01 2014 00:00:00
*/
export function startOfWeek(date, options) {
const defaultOptions = getDefaultOptions();
const weekStartsOn =
options?.weekStartsOn ??
options?.locale?.options?.weekStartsOn ??
defaultOptions.weekStartsOn ??
defaultOptions.locale?.options?.weekStartsOn ??
0;
const _date = toDate(date, options?.in);
const day = _date.getDay();
const diff = (day < weekStartsOn ? 7 : 0) + day - weekStartsOn;
_date.setDate(_date.getDate() - diff);
_date.setHours(0, 0, 0, 0);
return _date;
}
// Fallback for modularized imports:
export default startOfWeek;