import * as fs from 'fs'

import { RecursiveTravelDirectoriesInput } from '@types'

import { isObjectADirectory } from './isObjectADirectory'

export const travelDirectory = ({
  rootDirectory,
  currentTravelDirectory = rootDirectory,
  travelCallBack,
}: RecursiveTravelDirectoriesInput) => {
  return new Promise(resolve => {
    fs.readdir(currentTravelDirectory, (err, objs) => {
      if (err) {
        throw err
      }

      // get child branches of current branch
      const childDirectories = objs.filter(obj => isObjectADirectory({ directory: currentTravelDirectory, obj }))

      const childFiles = objs.filter(obj => !isObjectADirectory({ directory: currentTravelDirectory, obj }))

      // travel the the deepst of node of the branch
      if (childDirectories.length === 0) {
        travelCallBack({
          directory: currentTravelDirectory,
          childFiles,
          childDirectories,
        })
        resolve()
        return
      }

      /**
       * wait until all child directory have been travlled
       * use for testing purpuse...
       */
      travelCallBack({
        directory: currentTravelDirectory,
        childFiles,
        childDirectories,
      })
      resolve()
    })
  })
}