import { sevenZipVolume } from '../sevenzip/index.js'

/**
 * Files whose first segment says what an archive holds: named first RAR
 * volumes (.part01.rar, .rar), 7z (.7z, .7z.001) and `.bin`, an extension
 * uploaders use for archive volumes too (sniffed by content).
 */
export function isArchiveStart(name: string): boolean {
  if (/\.bin$/i.test(name)) return true
  const volume = sevenZipVolume(name)
  if (volume === 0 || volume === 1) return true
  return /\.part0*1\.rar$/i.test(name) || (/\.rar$/i.test(name) && !/\.part\d+\.rar$/i.test(name))
}