export function useFileSize() {
  function formatFileSize(bytes: number): string {
    if (!Number.isFinite(bytes) || bytes < 0) return '-'
    if (bytes < 1024) return `${bytes} B`
    if (bytes < 1024 * 1024) return `${(bytes / 1024).toFixed(1)} KB`
    return `${(bytes / (1024 * 1024)).toFixed(2)} MB`
  }

  return { formatFileSize }
}