import getISOWeekYear from '../getISOWeekYear/index.js'
import startOfISOWeek from '../startOfISOWeek/index.js'

/**
 * @name lastDayOfISOWeekYear
 * @category ISO Week-Numbering Year Helpers
 * @summary Return the last day of an ISO week-numbering year for the given date.
 *
 * @description
 * Return the last day of an ISO week-numbering year,
 * which always starts 3 days before the year's first Thursday.
 * The result will be in the local timezone.
 *
 * ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date
 *
 * @param {Date|String|Number} date - the original date
 * @param {Options} [options] - the object with options. See [Options]{@link https://date-fns.org/docs/Options}
 * @param {0|1|2} [options.additionalDigits=2] - passed to `toDate`. See [toDate]{@link https://date-fns.org/docs/toDate}
 * @returns {Date} the end of an ISO week-numbering year
 * @throws {TypeError} 1 argument required
 * @throws {RangeError} `options.additionalDigits` must be 0, 1 or 2
 *
 * @example
 * // The last day of an ISO week-numbering year for 2 July 2005:
 * var result = lastDayOfISOWeekYear(new Date(2005, 6, 2))
 * //=> Sun Jan 01 2006 00:00:00
 */
export default function lastDayOfISOWeekYear (dirtyDate, dirtyOptions) {
  if (arguments.length < 1) {
    throw new TypeError('1 argument required, but only ' + arguments.length + ' present')
  }

  var year = getISOWeekYear(dirtyDate, dirtyOptions)
  var fourthOfJanuary = new Date(0)
  fourthOfJanuary.setFullYear(year + 1, 0, 4)
  fourthOfJanuary.setHours(0, 0, 0, 0)
  var date = startOfISOWeek(fourthOfJanuary, dirtyOptions)
  date.setDate(date.getDate() - 1)
  return date
}
