/*
 *  node-arduino: Control your Arduino with Node
 *
 *  Copyright (c) 2010 Tobias Schneider
 *  node-arduino is freely distributable under the terms of the MIT license.
 */

var sys = require('sys')
  , SerialPort = require('../deps/node-serialport/serialport').SerialPort
  ;

const SERIAL_BAUDRATE = 9600;

const OPC_PIN_MODE         = 0x01;
const OPC_DIGITAL_READ     = 0x02;
const OPC_DIGITAL_WRITE    = 0x03;
const OPC_ANALOG_REFERENCE = 0x04;
const OPC_ANALOG_READ      = 0x05;
const OPC_ANALOG_WRITE     = 0x06;

exports.HIGH = 0x01;
exports.LOW  = 0x00;

exports.INPUT  = 0x00;
exports.OUTPUT = 0x01;

exports.true  = 0x01;
exports.false = 0x00;

exports.EXTERNAL = 0x00;
exports.DEFAULT  = 0x01;
exports.INTERNAL = 0x03;

Board = function (path) {
  this.sp = new SerialPort(path, SERIAL_BAUDRATE);
}

Board.prototype = {
  pinMode : function (pin, mode) {
    this.sp.write(new Buffer([OPC_PIN_MODE, pin, mode]), 3);
  }

, digitalRead : function (pin) {
    // TODO
  }

, digitalWrite : function (pin, val) {
    this.sp.write(new Buffer([OPC_DIGITAL_WRITE, pin, val]), 3);
  }

, analogReference : function (type) {
    this.sp.write(new Buffer([OPC_ANALOG_REFERENCE, type]), 2);
  }

, analogRead : function (pin) {
    // TODO
  }

, analogWrite : function (pin, val) {
    this.sp.write(new Buffer([OPC_ANALOG_WRITE, pin, val]), 3);
  }
};

exports.connect = function (path) {
  return new Board(path);
};