var noble = require("noble");
var robot = require("robotjs");
var begMovement = [];
var initPos = [];
var moving = false;
var clicked = false;

robot.setMouseDelay(20);

noble.on('stateChange', function(state) {
  if (state === 'poweredOn') {
    noble.startScanning();
  } else {
    noble.stopScanning();
  }
});

noble.on('discover', function(peripheral) {
  if (true) {
    peripheral.connect(function(err) {
      peripheral.discoverServices(['fe55'], function(err, services) {
        services.forEach(function(service) {
          service.discoverCharacteristics(['0000000110001000800000805f9b34fb'], function(err, characteristics) {
            characteristics.forEach(function(characteristic) {
              characteristic.subscribe();
              characteristic.on('data', function(data, isNotification) {
                var ab = new ArrayBuffer(data.length);
                var view = new Uint8Array(ab);
                for (var i = 0; i < data.length; ++i) {
                  view[i] = data[i];
                }
                dv = new DataView(ab);
                x = ((((dv.getUint8(16) & 0x1F) << 3 | (dv.getUint8(17) & 0xE0) >> 5) / 255.0) - 0.1)/ 0.8;
                y = ((((dv.getUint8(17) & 0x1F) << 3 | (dv.getUint8(18) & 0xE0) >> 5) / 255.0) - 0.1)/ 0.8;
                if(!moving) {
                  if((x !== -0.125 || y !== -0.125)) {
                    moving = true;
                  }
                  begMovement = [x,y];
                  initPos = [robot.getMousePos().x,robot.getMousePos().y];
                }
                else {
                  if(x == -0.125 && y == -0.125) {
                    moving = false;
                    begMovement = [x,y];
                    initPos = [robot.getMousePos().x,robot.getMousePos().y];
                  }
                  else {
                    robot.moveMouse(initPos[0] + ((x-begMovement[0])*Math.floor(robot.getScreenSize().width)/2),initPos[1] + (y-begMovement[1])*Math.floor(robot.getScreenSize().height)/2);
                  }
                }

                //Is the touchpad being pressed down?
                click = (dv.getUint8(18) & 0x1) > 0;
                if(!clicked && click) {
                  robot.mouseClick();
                  }
                else if(clicked && !click) {
                  clicked = false;
                }

                //Is the app button being pressed down?
                app = (dv.getUint8(18) & 0x4) > 0;
                if(!clicked && app) {
                  clicked = true;
                  robot.mouseClick();
                }
                else if(clicked && !app) {
                  clicked = false;
                }

                //Is the volume up button being pressed down?
                up = (dv.getUint8(18) & 0x10) > 0;
                if(!clicked && up) {
                  clicked = true;
                  robot.scrollMouse(0,5);
                }
                else if(clicked && !up) {
                  clicked = false;
                }

                //Is the volume down button being pressed down?
                down = (dv.getUint8(18) & 0x8) > 0;
                if(!clicked && down) {
                  clicked = true;
                  robot.scrollMouse(0,-5);
                }
                else if(clicked && !down) {
                  clicked = false;
                }
              })
            })
          })
        })
      })
    })
  }
});