import { describe, expect, it } from 'vitest'

import { clampJalaliDateParts, isAllowedBirthDate, isoDateToJalaliParts, jalaliPartsToIsoDate } from '@/lib/birthDate'

describe('birth date helpers', () => {
  it('converts Jalali wheel values to a Gregorian date-only string', () => {
    expect(jalaliPartsToIsoDate({ day: '1', month: '1', year: '1370' })).toBe('1991-03-21')
    expect(jalaliPartsToIsoDate({ day: '1', month: '1', year: '1330' })).toBe('1951-03-22')
    expect(jalaliPartsToIsoDate({ day: '30', month: '12', year: '1395' })).toBe('2017-03-20')
  })

  it('clamps Esfand days to the selected Jalali year length', () => {
    expect(clampJalaliDateParts({ day: '31', month: '12', year: '1395' })).toEqual({
      day: '30',
      month: '12',
      year: '1395',
    })
    expect(clampJalaliDateParts({ day: '31', month: '7', year: '1370' })).toEqual({
      day: '30',
      month: '7',
      year: '1370',
    })
  })

  it('accepts only ISO dates whose Jalali year is 1330–1395', () => {
    expect(isAllowedBirthDate('1991-03-21')).toBe(true)
    expect(isoDateToJalaliParts('1991-03-21')).toEqual({ day: '1', month: '1', year: '1370' })
    expect(isAllowedBirthDate('1951-03-21')).toBe(false)
    expect(isAllowedBirthDate('2018-01-01')).toBe(false)
    expect(isAllowedBirthDate('1991-03-21T00:00:00.000Z')).toBe(false)
  })
})