export function formatFileSize(bytes: number | null | undefined): string {
  if (bytes == null || !Number.isFinite(bytes)) {
    return ''
  }

  if (bytes < 1024) {
    return `${Math.max(0, Math.round(bytes))} B`
  }

  const units = ['KB', 'MB', 'GB', 'TB']
  let value = bytes / 1024
  let unitIndex = 0

  while (value >= 1024 && unitIndex < units.length - 1) {
    value /= 1024
    unitIndex += 1
  }

  const precision = value >= 10 || unitIndex === 0 ? 1 : 2
  return `${value.toFixed(precision)} ${units[unitIndex]}`
}