var parse = require('../parse/index.js')
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var addDays = require('../add_days/index.js')
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var getISODay = require('../get_iso_day/index.js')
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/**
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* @category Weekday Helpers
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* @summary Set the day of the ISO week to the given date.
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*
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* @description
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* Set the day of the ISO week to the given date.
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* ISO week starts with Monday.
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* 7 is the index of Sunday, 1 is the index of Monday etc.
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*
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* @param {Date|String|Number} date - the date to be changed
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* @param {Number} day - the day of the ISO week of the new date
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* @returns {Date} the new date with the day of the ISO week setted
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*
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* @example
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* // Set Sunday to 1 September 2014:
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* var result = setISODay(new Date(2014, 8, 1), 7)
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* //=> Sun Sep 07 2014 00:00:00
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*/
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function setISODay (dirtyDate, dirtyDay) {
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var date = parse(dirtyDate)
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var day = Number(dirtyDay)
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var currentDay = getISODay(date)
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var diff = day - currentDay
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return addDays(date, diff)
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}
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module.exports = setISODay
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