class TransitionRecognition : TransitionRecognitionAbstract(), GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {
    private val TAG = TransitionRecognition::class.java!!.getSimpleName()

    lateinit var mGoogleApiClient: GoogleApiClient
    lateinit var mRecognitionIntent: PendingIntent
    lateinit var mContext: Context

    override fun startTracking(context: Context) {
        mContext = context

        if (mGoogleApiClient == null) {
            mGoogleApiClient = GoogleApiClient.Builder(context.applicationContext)
                    .addConnectionCallbacks(this)
                    .addOnConnectionFailedListener(this)
                    .addApi(ActivityRecognition.API)
                    .build()
        }

        if (!mGoogleApiClient!!.isConnected && !mGoogleApiClient!!.isConnecting) {
            val intent = Intent(mContext, ExerciseRecognitionService::class.java)
            mRecognitionIntent = PendingIntent.getService(mContext, ExerciseRecognitionService.REQUEST_CODE, intent, PendingIntent.FLAG_UPDATE_CURRENT)
            mGoogleApiClient!!.connect()
        }
    }

    override fun stopTracking() {
        if (mGoogleApiClient != null && (mGoogleApiClient!!.isConnected() || mGoogleApiClient!!.isConnecting())) {
            mGoogleApiClient!!.disconnect();
        }
    }

    /***********************************************************************************************
     * GOOGLE API CALLBACKS
     **********************************************************************************************/
    override fun onConnected(bundle: Bundle?) {
        ActivityRecognition.ActivityRecognitionApi.requestActivityUpdates(mGoogleApiClient, 60 * 1000, mRecognitionIntent)

    }

    override fun onConnectionSuspended(i: Int) {
        stopTracking()
    }

    override fun onConnectionFailed(connectionResult: ConnectionResult) {
        stopTracking()
    }
}