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"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = setWeek;
var _index = _interopRequireDefault(require("../getWeek/index.js"));
var _index2 = _interopRequireDefault(require("../toDate/index.js"));
var _index3 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));
var _index4 = _interopRequireDefault(require("../_lib/toInteger/index.js"));
/**
 * @name setWeek
 * @category Week Helpers
 * @summary Set the local week to the given date.
 *
 * @description
 * Set the local week to the given date, saving the weekday number.
 * The exact calculation depends on the values of
 * `options.weekStartsOn` (which is the index of the first day of the week)
 * and `options.firstWeekContainsDate` (which is the day of January, which is always in
 * the first week of the week-numbering year)
 *
 * Week numbering: https://en.wikipedia.org/wiki/Week#Week_numbering
 *
 * @param {Date|Number} date - the date to be changed
 * @param {Number} week - the week of the new date
 * @param {Object} [options] - an object with options.
 * @param {Locale} [options.locale=defaultLocale] - the locale object. See [Locale]{@link https://date-fns.org/docs/Locale}
 * @param {0|1|2|3|4|5|6} [options.weekStartsOn=0] - the index of the first day of the week (0 - Sunday)
 * @param {1|2|3|4|5|6|7} [options.firstWeekContainsDate=1] - the day of January, which is always in the first week of the year
 * @returns {Date} the new date with the local week set
 * @throws {TypeError} 2 arguments required
 * @throws {RangeError} `options.weekStartsOn` must be between 0 and 6
 * @throws {RangeError} `options.firstWeekContainsDate` must be between 1 and 7
 *
 * @example
 * // Set the 1st week to 2 January 2005 with default options:
 * const result = setWeek(new Date(2005, 0, 2), 1)
 * //=> Sun Dec 26 2004 00:00:00
 *
 * @example
 * // Set the 1st week to 2 January 2005,
 * // if Monday is the first day of the week,
 * // and the first week of the year always contains 4 January:
 * const result = setWeek(new Date(2005, 0, 2), 1, {
 *   weekStartsOn: 1,
 *   firstWeekContainsDate: 4
 * })
 * //=> Sun Jan 4 2004 00:00:00
 */
function setWeek(dirtyDate, dirtyWeek, options) {
  (0, _index3.default)(2, arguments);
  var date = (0, _index2.default)(dirtyDate);
  var week = (0, _index4.default)(dirtyWeek);
  var diff = (0, _index.default)(date, options) - week;
  date.setDate(date.getDate() - diff * 7);
  return date;
}
module.exports = exports.default;

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