var Tinkerforge = require('../Tinkerforge')
,   Conf        = require('./config.json')
,   http        = require('http');

var HOST = Conf.host;
var PORT = Conf.port;
var UID = Conf.uid;

var ipcon = new Tinkerforge.IPConnection(); // Create IP connection
var dus = new Tinkerforge.BrickletDistanceUS(UID, ipcon); // Create device object

var counter = 0;
var readyForNextNotification = true;

ipcon.connect(HOST, PORT,
  function (error) {
    console.log('Error: ' + error);
  }
); // Connect to brickd
// Don't use device before ipcon is connected

ipcon.on(Tinkerforge.IPConnection.CALLBACK_CONNECTED,
  function (connectReason) {
    // Set period for distance value callback to 0.2s (200ms)
    // Note: The distance value callback is only called every 0.2 seconds
    //       if the distance value has changed since the last call!
    dus.setDistanceCallbackPeriod(200);
  }
);

// Register distance value callback
dus.on(Tinkerforge.BrickletDistanceUS.CALLBACK_DISTANCE,
  // Callback function for distance value callback
  function (distance) {
    //console.log('Distance Value: ' + distance);
    
    if(distance < 200 && readyForNextNotification) {
      counter++;
      readyForNextNotification = false;
      
      var url2callObj = (counter % 2 == 0 ? Conf.on.action.on : Conf.on.action.off);
      
      console.log('Distance Value: ' + distance + ', URL to call: ' + url2callObj.host + ':' + url2callObj.port + url2callObj.path);
      doHoBuDoorBellCall(url2callObj);
      
      setTimeout(function() { readyForNextNotification = true; }, Conf.on.action.timeout);
    }
  }
);

console.log('Press key to exit');
process.stdin.on('data',
  function (data) {
    ipcon.disconnect();
    process.exit(0);
  }
);


/* private */
function doHoBuDoorBellCall(options) {
  callback = function(response) {
    var str = '';
  
    //another chunk of data has been recieved, so append it to `str`
    response.on('data', function (chunk) {
      str += chunk;
    });

    //the whole response has been recieved, so we just print it out here
    response.on('end', function () {
      console.log(str);
    });
  }

  http.request(options, callback).end();
}