const settings = require('./settings');
const Path = __dirname + settings.dbDir
var api = {}


const fs = require('fs').promises;


const notFount = 'Error: ENOENT: no such file or directory'

function print(files){
  console.log(files)
}

function checkCollection(path, callback, args){
  const files = fs.readdir(path)

  function fn(files){
    callback(files, args)
  }

  files.catch(function(err){
    console.log('catch')
    if(err.toString().substr(0, notFount.length) == notFount){
      p = fs.mkdir(path)
      p.catch((err) => { throw err })
      p.then(() => { checkCollection(path, callback, args) })
    }else{
      throw err
    }
  })
  files.then(fn)
}

api.get = function(coll, file, fn){
  const path = Path + '/' + coll

  checkCollection(path, get, [path, file, fn])
}

function get(files, args){
  const path = args[0], file = args[1], fn = args[2]
  if(files.indexOf(file) == -1){
    return fn('file not found', null)
  }
  data = fs.readFile(path + '/' + file)
  data.catch((err) => {
    fn('error reading file', null)
  })
  data.then((content) => {
    fn(false, content)
  })
}

api.get('test', 'documents.json', console.log)
setTimeout(api.get, 1000, 'test2', 'documents.json', console.log)