import moment from 'moment'

const FRONTEND_FORMAT = 'DD.MM.YYYY'
const BACKEND_FORMAT = 'YYYY-MM-DD'

export function getDays({ startDate, endDate }) {
  let currentDay = moment(startDate)
  const days = [dateFormatBackend(currentDay)]

  if (!endDate) {
    return days
  }

  const end = moment(endDate)
  while (currentDay < end) {
    currentDay = currentDay.add(1, 'day')
    days.push(dateFormatBackend(currentDay))
  }

  return days
}

function dateFormat(date, format) {
  if (!date) {
    return null
  }
  return moment(date).format(format)
}

export function dateFormatBackend(date) {
  return dateFormat(date, BACKEND_FORMAT)
}

export function dateFormatFrontend(date) {
  return dateFormat(date, FRONTEND_FORMAT)
}

function dateParse(string, format) {
  const date = moment(string, format)
  if (date.isValid()) {
    // @ts-expect-error ts-migrate(2339) FIXME: Property 'getDate' does not exist on type 'Moment'... Remove this comment to see the full error message
    return date.getDate()
  }

  return null
}

export function dateParseFrontend(string) {
  return dateParse(string, FRONTEND_FORMAT)
}