import { date as formatDate } from '@planningcenter/datetime-fmt'
import dayjs from './dayjs'

export type DateProps = string | number | Date

export function formatDatePreview(date?: DateProps) {
  if (!date) return ''

  const now = dayjs()
  const isToday = now.isSame(date, 'day')
  const isThisWeek = now.isSame(date, 'week')
  const isThisYear = now.isSame(date, 'year')

  if (isToday) return dayjs(date).format('h:mma')
  if (isThisWeek) return formatDate(date, { style: 'relative-short' })
  if (isThisYear) return formatDate(date, { style: 'abbreviated' })

  // TODO: Org date format
  return formatShorterDate(date)
}

const formatShorterDate = (date: DateProps) => {
  // Drop the century from the year
  return formatDate(date, { style: 'short', year: true }).replace(/20(\d{2})/, '$1')
}

export function getRelativeDateStatus(date: DateProps) {
  const now = dayjs()

  const isToday = now.isSame(date, 'day')
  const isThisWeek = now.isSame(date, 'week')
  const isThisYear = now.isSame(date, 'year')

  return { isToday, isThisWeek, isThisYear }
}

export function relativeDateTime(dateTimeString: string): string {
  const date = new Date(dateTimeString)
  const now = new Date()

  const isToday = date.toDateString() === now.toDateString()
  const isThisYear = date.getFullYear() === now.getFullYear()

  if (isToday) {
    return date.toLocaleTimeString('en-US', { hour: '2-digit', minute: '2-digit', hour12: true })
  } else if (isThisYear) {
    return date.toLocaleDateString('en-US', { month: 'short', day: 'numeric' })
  } else {
    return date.toLocaleDateString('en-US')
  }
}

export function relativeTime(date: DateProps): string {
  const now = dayjs()
  const then = dayjs(date)
  const duration = dayjs.duration(now.diff(then))

  if (duration.asDays() < 1) {
    return then.fromNow()
  } else {
    return dayjs(date).format('h:mma')
  }
}

export function formatEventDateTime(date: DateProps) {
  const { isThisYear } = getRelativeDateStatus(date)
  const local = dayjs(date)
  const day = local.format(isThisYear ? 'MMM D' : 'MMM D, YYYY')
  const time = local.format(local.minute() === 0 ? 'ha' : 'h:mma')
  return `${day} at ${time}`
}