const fs = require('fs').promises
const settings = require('./settings')

//TODO: use a propper file type and search method
//TODO: allow encryption

const Path = __dirname + settings.dbDir + '/'

module.exports = {}

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)
}



module.exports.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]
  delete args

  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)
  })
}



module.exports.write = function(coll, file, data, fn){
  const path = Path + '/' + coll

  checkCollection(path, write, [path, file, data, fn])
}

function write(files, args){
  const path = args[0], file = args[1], data = args[2], fn = args[3]
  delete args

  data = fs.writeFile(path + '/' + file, data)
  data.catch((err) => {
    fn('error write file')
  })
  data.then(() => {
    fn(false)
  })
}