var parse = require('../parse/index.js')
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/**
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* @category Week Helpers
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* @summary Return the last day of a week for the given date.
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*
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* @description
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* Return the last day of a week for the given date.
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* The result will be in the local timezone.
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*
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* @param {Date|String|Number} date - the original date
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* @param {Object} [options] - the object with options
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* @param {Number} [options.weekStartsOn=0] - the index of the first day of the week (0 - Sunday)
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* @returns {Date} the last day of a week
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*
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* @example
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* // The last day of a week for 2 September 2014 11:55:00:
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* var result = lastDayOfWeek(new Date(2014, 8, 2, 11, 55, 0))
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* //=> Sat Sep 06 2014 00:00:00
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*
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* @example
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* // If the week starts on Monday, the last day of the week for 2 September 2014 11:55:00:
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* var result = lastDayOfWeek(new Date(2014, 8, 2, 11, 55, 0), {weekStartsOn: 1})
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* //=> Sun Sep 07 2014 00:00:00
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*/
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function lastDayOfWeek (dirtyDate, dirtyOptions) {
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var weekStartsOn = dirtyOptions ? (Number(dirtyOptions.weekStartsOn) || 0) : 0
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var date = parse(dirtyDate)
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var day = date.getDay()
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var diff = (day < weekStartsOn ? -7 : 0) + 6 - (day - weekStartsOn)
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date.setHours(0, 0, 0, 0)
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date.setDate(date.getDate() + diff)
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return date
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}
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module.exports = lastDayOfWeek
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