export const formatDuration = (totalSeconds: number) => {
  const totalMinutes = Math.max(1, Math.ceil(totalSeconds / 60))
  const hours = Math.floor(totalMinutes / 60)
  const minutes = totalMinutes % 60

  if (hours === 0) return `${minutes} min`
  if (minutes === 0) return `${hours} hr`
  return `${hours} hr ${minutes} min`
}

const startOfDay = (date: Date) =>
  new Date(date.getFullYear(), date.getMonth(), date.getDate())

export const formatEtaClock = (etaSeconds: number, now = new Date()) => {
  const target = new Date(now.getTime() + etaSeconds * 1000)
  const time = target.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' })
  const dayDiff = Math.round(
    (startOfDay(target).getTime() - startOfDay(now).getTime()) / 86_400_000,
  )

  if (dayDiff === 0) return `today, ${time}`
  if (dayDiff === 1) return `tomorrow, ${time}`
  return `${target.toLocaleDateString([], { weekday: 'long' })}, ${time}`
}

const ABSOLUTE_TIME_THRESHOLD_SECONDS = 3 * 60 * 60

export const formatEtaMessage = (etaSeconds: number, now = new Date()) =>
  etaSeconds > ABSOLUTE_TIME_THRESHOLD_SECONDS
    ? `Ready ${formatEtaClock(etaSeconds, now)}`
    : `Ready in about ${formatDuration(etaSeconds)}`