export function formatDuration(start: Date, end?: Date): string {
  const duration = (end ?? new Date()).getTime() - start.getTime()
  const seconds = Math.floor(duration / 1000)
  const minutes = Math.floor(seconds / 60)
  const hours = Math.floor(minutes / 60)

  if (hours > 0) {
    return `${hours}h ${minutes % 60}m ${seconds % 60}s`
  }
  if (minutes > 0) {
    return `${minutes}m ${seconds % 60}s`
  }
  return `${seconds}s`
}

export function formatMessageTime(value: unknown): string {
  if (typeof value === "string") {
    const date = new Date(value)
    return Number.isNaN(date.getTime()) ? value : date.toISOString()
  }
  if (typeof value === "object" && value !== null) {
    if ("created" in value) {
      const created = (value as { created?: number }).created
      if (typeof created === "number") {
        return new Date(created).toISOString()
      }
    }
  }
  return "Unknown time"
}