const dgram = require('dgram');

const UNIVERSE_LEN = 512;

function BBDMX(deviceId = '127.0.0.1', options = {}) {
  const self = this;

  self.options = options;
  self.universe = new Buffer(UNIVERSE_LEN + 1);
  self.universe.fill(0);
  self.host = deviceId;
  self.port = self.options.port || 9930;
  self.dev = dgram.createSocket('udp4');
  self.sleepTime = 24;
  self.start();
}

BBDMX.prototype.sendUniverse = function () {
  let channel;
  let messageBuffer = new Buffer(UNIVERSE_LEN.toString());

  for (const i = 1; i <= UNIVERSE_LEN; i++) {
    channel = new Buffer(' ' + this.universe[i]);
    messageBuffer = Buffer.concat([messageBuffer, channel]);
  }
  this.dev.send(messageBuffer, 0, messageBuffer.length, this.port, this.host);
};

BBDMX.prototype.start = function () {
  this.timeout = setInterval(this.sendUniverse.bind(this), this.sleepTime);
};

BBDMX.prototype.stop = function () {
  clearInterval(this.timeout);
};

BBDMX.prototype.close = function (cb) {
  this.stop();
  cb(null);
};

BBDMX.prototype.update = function (u) {
  for (const c in u) {
    this.universe[c] = u[c];
  }
};

BBDMX.prototype.updateAll = function (v) {
  for (const i = 1; i <= UNIVERSE_LEN; i++) {
    this.universe[i] = v;
  }
};

BBDMX.prototype.get = function (c) {
  return this.universe[c];
};

module.exports = BBDMX;