import enGbLocale from '@fullcalendar/core/locales/en-gb'
import { DayGridViewWrapper } from '../lib/wrappers/DayGridViewWrapper.js'
import { CalendarWrapper } from '../lib/wrappers/CalendarWrapper.js'

describe('firstDay', () => {
  describe('when using default settings', () => {
    it('should make Sunday the first day of the week', () => {
      let calendar = initCalendar()
      expectDowStartAt(calendar, 0)
    })
  })

  describe('when setting firstDay to 0', () => {
    pushOptions({
      firstDay: 0,
    })

    it('should make Sunday the first day of the week', () => {
      let calendar = initCalendar()
      expectDowStartAt(calendar, 0)
    })
  })

  describe('when setting firstDay to 1', () => {
    pushOptions({
      firstDay: 1,
    })

    it('should make Monday the first day of the week', () => {
      let calendar = initCalendar()
      expectDowStartAt(calendar, 1)
    })
  })

  describe('when setting weekNumberCalculation to ISO', () => {
    pushOptions({
      weekNumberCalculation: 'ISO',
    })

    it('should make Monday the first day of the week', () => {
      let calendar = initCalendar()
      expectDowStartAt(calendar, 1)
    })
  })

  describeOptions('direction', {
    'when LTR': 'ltr',
    'when RTL': 'rtl',
  }, () => {
    pushOptions({
      firstDay: 2,
    })

    it('should make Tuesday the first day of the week', () => {
      let calendar = initCalendar()
      expectDowStartAt(calendar, 2)
    })
  })

  describe('when setting firstDay to 2 and weekNumberCalculation to ISO', () => {
    pushOptions({
      firstDay: 2,
      weekNumberCalculation: 'ISO',
    })

    it('should make Tuesday the first day of the week', () => {
      let calendar = initCalendar()
      expectDowStartAt(calendar, 2)
    })
  })

  describe('when setting firstDay to 3', () => {
    pushOptions({
      firstDay: 3,
    })

    it('should make Wednesday the first day of the week', () => {
      let calendar = initCalendar()
      expectDowStartAt(calendar, 3)
    })
  })

  it('should have a different default value based on the locale', () => {
    let calendar = initCalendar({
      locale: enGbLocale,
    })
    // firstDay will be 1 (Monday) in Great Britain
    expectDowStartAt(calendar, 1)
  })

  const DOW_CLASSNAMES = CalendarWrapper.DOW_CLASSNAMES

  function expectDowStartAt(calendar, dowNum) {
    let headerWrapper = new DayGridViewWrapper(calendar).header
    let cellEls = headerWrapper.getCellEls()

    for (let i = 0; i < 7; i += 1) {
      expect(cellEls[i]).toHaveClass(DOW_CLASSNAMES[(i + dowNum) % 7])
    }
  }
})