var events = require('events'),
    child  = require('child_process'),
    util   = require('util'),
    serial = require("serialport").SerialPort;

var Arduino = function (baudrate) {
  this.baudrate = baudrate && baudrate || 9600;
  this.writeBuffer = [];
  this.success;
}

Arduino.prototype.setup = function () {
  child.exec('cd ../arduino && ino build && ino upload', function(err, stdout, stderr){
    
    if(err){console.log('Please install the ino utility and connect arduino!\nIf there are other open programs that communicate with the arduino, close them!'); return this.success = false;}

    var buff = stdout.slice(stdout.indexOf('Guessing serial port ... ')+25);
    buff = buff.slice(0, buff.indexOf('\n'));
    console.log('Guessing serial port ... ' + buff);

    this.serial = new serial(buff, {
      baudrate: this.baudrate,
      parser: serial.parsers.readline('\n')
    }, false);
    
    this.serial.open(function (error) {
      if ( error ) {
        console.log('Please check arduino!')
        return this.success = false;
      }

      serialPort.write(new Buffer('00000000'));
    });
    
    this.success = true;
    this.processWriteBuffer();    
  });
}

Arduino.prototype.write = function (m) {
  if (this.success) {
    this.serial.write(m);
  } else {
    this.writeBuffer.push(m);
    console.log('Board isn\'t available (yet?).')
  }
}

Arduino.prototype.processWriteBuffer = function () {
  while (this.writeBuffer.length > 0) {
    this.write(this.writeBuffer.shift());
  }
}

module.exports = Arduino;