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import toInteger from '../toInteger/index'
import toDate from '../../toDate/index'
import startOfUTCWeek from '../startOfUTCWeek/index'
import requiredArgs from '../requiredArgs/index'
// This function will be a part of public API when UTC function will be implemented.
// See issue: https://github.com/date-fns/date-fns/issues/376
export default function getUTCWeekYear(dirtyDate, dirtyOptions) {
requiredArgs(1, arguments)
var date = toDate(dirtyDate, dirtyOptions)
var year = date.getUTCFullYear()
var options = dirtyOptions || {}
var locale = options.locale
var localeFirstWeekContainsDate =
locale && locale.options && locale.options.firstWeekContainsDate
var defaultFirstWeekContainsDate =
localeFirstWeekContainsDate == null
? 1
: toInteger(localeFirstWeekContainsDate)
var firstWeekContainsDate =
options.firstWeekContainsDate == null
? defaultFirstWeekContainsDate
: toInteger(options.firstWeekContainsDate)
// Test if weekStartsOn is between 1 and 7 _and_ is not NaN
if (!(firstWeekContainsDate >= 1 && firstWeekContainsDate <= 7)) {
throw new RangeError(
'firstWeekContainsDate must be between 1 and 7 inclusively'
)
}
var firstWeekOfNextYear = new Date(0)
firstWeekOfNextYear.setUTCFullYear(year + 1, 0, firstWeekContainsDate)
firstWeekOfNextYear.setUTCHours(0, 0, 0, 0)
var startOfNextYear = startOfUTCWeek(firstWeekOfNextYear, dirtyOptions)
var firstWeekOfThisYear = new Date(0)
firstWeekOfThisYear.setUTCFullYear(year, 0, firstWeekContainsDate)
firstWeekOfThisYear.setUTCHours(0, 0, 0, 0)
var startOfThisYear = startOfUTCWeek(firstWeekOfThisYear, dirtyOptions)
if (date.getTime() >= startOfNextYear.getTime()) {
return year + 1
} else if (date.getTime() >= startOfThisYear.getTime()) {
return year
} else {
return year - 1
}
}
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