var promisify = require('promisify-node'),
    PromiseFtp = require('promise-ftp'),
    fs = promisify('fs')

var _ftp = new PromiseFtp(),
    _localFilePath  = './data/',
    _remoteFilePath = '/public_html/temp/'

function Ftp(env){
  this.config = {
    host: 'host',
    user: 'user',
    password: 'password'
  }
}

Ftp.prototype.mput = function(fileList){
  _ftp.connect(this.config)
    .then(() => multiPutFiles(fileList))
    .then(() => {
      // clear cache here
      console.log('disconnecting...')
      return _ftp.end()
    })
    // connection errors
    .catch((err) => { console.log(err.toString()) })
}

Ftp.prototype.publish = function(ext){
  return fs.readdir(_localFilePath)
    .then(function(files){
      var pattern = new RegExp('.' + ext)
      return files.filter((file) => pattern.test(file))
    })
}

function multiPutFiles(fileList){
  return new Promise(function(resolve, reject){
    var chain = Promise.resolve()

    fileList.forEach(function(file, i, arr){
      chain = chain.then(() => {
        console.log('uploading:', _localFilePath + file)
        return _ftp.put(_localFilePath + file, _remoteFilePath + file)
      })
      // file upload errors
      .catch((err) => { console.log(err.toString()) })

      if(i === arr.length - 1)
        chain.then(() => resolve())
    })
  })
}

//var ftp = new Ftp('LIVE');
//ftp.publish('json').done((files) => ftp.mput(files))
//ftp.mput(['test.txt', 'test1.txt'])

module.exports = Ftp