var parse = require('../parse/index.js')
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var getISOWeek = require('../get_iso_week/index.js')
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/**
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* @category ISO Week Helpers
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* @summary Set the ISO week to the given date.
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*
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* @description
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* Set the ISO week to the given date, saving the weekday number.
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*
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* ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date
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*
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* @param {Date|String|Number} date - the date to be changed
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* @param {Number} isoWeek - the ISO week of the new date
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* @returns {Date} the new date with the ISO week setted
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*
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* @example
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* // Set the 53rd ISO week to 7 August 2004:
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* var result = setISOWeek(new Date(2004, 7, 7), 53)
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* //=> Sat Jan 01 2005 00:00:00
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*/
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function setISOWeek (dirtyDate, dirtyISOWeek) {
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var date = parse(dirtyDate)
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var isoWeek = Number(dirtyISOWeek)
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var diff = getISOWeek(date) - isoWeek
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date.setDate(date.getDate() - diff * 7)
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return date
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}
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module.exports = setISOWeek
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