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import getDate from '../getDate/index'
import getDay from '../getDay/index'
import startOfMonth from '../startOfMonth/index'
import toInteger from '../_lib/toInteger/index'
import requiredArgs from '../_lib/requiredArgs/index'
/**
* @name getWeekOfMonth
* @category Week Helpers
* @summary Get the week of the month of the given date.
*
* @description
* Get the week of the month of the given date.
*
* ### v2.0.0 breaking changes:
*
* - [Changes that are common for the whole library](https://github.com/date-fns/date-fns/blob/master/docs/upgradeGuide.md#Common-Changes).
*
* @param {Date|Number} date - the given 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)
* @returns {Number} the week of month
* @throws {TypeError} 1 argument required
* @throws {RangeError} `options.weekStartsOn` must be between 0 and 6
*
* @example
* // Which week of the month is 9 November 2017?
* var result = getWeekOfMonth(new Date(2017, 10, 9))
* //=> 2
*/
export default function getWeekOfMonth(date, dirtyOptions) {
requiredArgs(1, arguments)
var options = dirtyOptions || {}
var locale = options.locale
var localeWeekStartsOn =
locale && locale.options && locale.options.weekStartsOn
var defaultWeekStartsOn =
localeWeekStartsOn == null ? 0 : toInteger(localeWeekStartsOn)
var weekStartsOn =
options.weekStartsOn == null
? defaultWeekStartsOn
: toInteger(options.weekStartsOn)
// Test if weekStartsOn is between 0 and 6 _and_ is not NaN
if (!(weekStartsOn >= 0 && weekStartsOn <= 6)) {
throw new RangeError('weekStartsOn must be between 0 and 6 inclusively')
}
var currentDayOfMonth = getDate(date)
if (isNaN(currentDayOfMonth)) {
return currentDayOfMonth
}
var startWeekDay = getDay(startOfMonth(date))
var lastDayOfFirstWeek = 0
if (startWeekDay >= weekStartsOn) {
lastDayOfFirstWeek = weekStartsOn + 7 - startWeekDay
} else {
lastDayOfFirstWeek = weekStartsOn - startWeekDay
}
var weekNumber = 1
if (currentDayOfMonth > lastDayOfFirstWeek) {
var remainingDaysAfterFirstWeek = currentDayOfMonth - lastDayOfFirstWeek
weekNumber = weekNumber + Math.ceil(remainingDaysAfterFirstWeek / 7)
}
return weekNumber
}
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