export function parseDurationToMs(duration: string): number {
  const match = duration.match(/^(\d+)([a-z]+)$/)
  if (!match) return 0

  const value = Number.parseInt(match[1])
  const unit = match[2]

  switch (unit) {
    case "h":
      return value * 60 * 60 * 1000
    case "d":
      return value * 24 * 60 * 60 * 1000
    case "w":
      return value * 7 * 24 * 60 * 60 * 1000
    case "mo":
      return value * 30 * 24 * 60 * 60 * 1000
    case "y":
      return value * 365 * 24 * 60 * 60 * 1000
    default:
      return 0
  }
}

export function humanRemaining(expiresAt: string): string {
  const now = new Date().getTime()
  const expires = new Date(expiresAt).getTime()
  const remaining = expires - now

  if (remaining <= 0) {
    return "Expired"
  }

  const days = Math.floor(remaining / (1000 * 60 * 60 * 24))
  const hours = Math.floor((remaining % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60))
  const minutes = Math.floor((remaining % (1000 * 60 * 60)) / (1000 * 60))
  const seconds = Math.floor((remaining % (1000 * 60)) / 1000)

  if (days > 0) {
    return `${days}d ${hours}h ${minutes}m ${seconds}s`
  } else if (hours > 0) {
    return `${hours}h ${minutes}m ${seconds}s`
  } else if (minutes > 0) {
    return `${minutes}m ${seconds}s`
  } else {
    return `${seconds}s`
  }
}