export function formatDuration(durationMs: number): string {
  const totalSeconds = Math.round(durationMs / 1000);
  const hours = Math.floor(totalSeconds / 3600);
  const minutes = Math.floor((totalSeconds % 3600) / 60);
  const seconds = totalSeconds % 60;

  if (hours > 0) {
    return `${hours}:${minutes.toString().padStart(2, "0")}:${seconds
      .toString()
      .padStart(2, "0")}`;
  }
  return `${minutes}:${seconds.toString().padStart(2, "0")}`;
}

/**
 * Format file size in bytes to human-readable string.
 * @example formatFileSize(1024) => "1 KB"
 * @example formatFileSize(1536000) => "1.5 MB"
 */
export function formatFileSize(bytes: number): string {
  if (bytes < 1024) return `${bytes} B`;
  const units = ["KB", "MB", "GB"];
  let size = bytes / 1024;
  let unit = 0;
  while (size >= 1024 && unit < units.length - 1) {
    size /= 1024;
    unit += 1;
  }
  return `${size.toFixed(size >= 10 ? 0 : 1)} ${units[unit]}`;
}