var noble = require('noble');

var bufferpack = require('bufferpack');



noble.on('stateChange', function(state) {
  if (state === 'poweredOn') {
    //
    // Once the BLE radio has been powered on, it is possible
    // to begin scanning for services. Pass an empty array to
    // scan for all services (uses more time and power).
    //
    console.log('scanning...');
    noble.startScanning([], false);
  }
  else {
    noble.stopScanning();
  }
})

var started, resetTimeoutHandle, resetTimeout = 1000,
        clicks = 0;

started = new Date();
    clicks = 0;

    function clicksPerSecond(started, clicks) {
    return clicks / ((new Date()) - started) * 1000;
}

var format = '<h(a_x)h(a_y)h(a_z)h(g_x)h(g_y)h(g_z)';

var count = 0;

noble.on('discover', function(peripheral) {
    if (peripheral.uuid == 'c23d48a715f1433d9cd011199ab5f77a') {
        noble.stopScanning();
        peripheral.connect(function(err) {
            //
            // Once the peripheral has been connected, then discover the
            // services and characteristics of interest.
            //
            peripheral.discoverServices(['180d'], function(err, services) {
                services.forEach(function(service) {
                    //
                    // This must be the service we were looking for.
                    //
                    console.log('found service:', service.uuid);

                    //
                    // So, discover its characteristics.
                    //
                    service.discoverCharacteristics(['2A37'], function(err, characteristics) {

                        characteristics.forEach(function(characteristic) {
                            //
                            // Loop through each characteristic and match them to the
                            // UUIDs that we know about.
                            //
                            console.log('found characteristic:', characteristic.uuid);

                            if(characteristic.uuid=='2a37'){
                                 characteristic.subscribe(function(err) {
                                   started = new Date();
                                  clicks = 0;
                                    console.log('found characteristic subscribe ', err);

                                 })
                            }
                              characteristic.on('data', function(data, isNotification){
                                clearTimeout(resetTimeoutHandle);
                                 clicks++;


                                  console.log('found characteristic subscribe ', data, bufferpack.unpack(format, data.toString('binary'), 0) ,clicksPerSecond(started, clicks),count);
                                  count++;
                              });
                        })
                    })
                })
            })
        })
    }

});