import * as fs from 'fs'
import * as fsp from 'fs/promises'
import * as path from 'path'

export const formatOutputFilename = async ({
  pagePath,
  filename,
  relativeFilename,
  extension,
}: {
  pagePath: string
  filename: string
  relativeFilename: string
  extension: string
}) => {
  const ext = path.extname(relativeFilename)
  const basename = path.basename(relativeFilename, ext)

  const dirname = path.dirname(relativeFilename).split('/').slice(1).join('/')
  const fullDirname = path.dirname(filename)

  if (
    fs.existsSync(path.join(fullDirname, basename)) &&
    (await fsp.stat(path.join(fullDirname, basename))).isDirectory()
  ) {
    return path.join(dirname, basename, 'index' + extension)
  }

  return path.join(dirname, basename + extension)
}