package com.google.marvin.remindme;



import android.content.Context;

import android.hardware.SensorListener;

import android.hardware.SensorManager;



public class ShakeDetector {



  public interface ShakeListener {

    public void onShakeDetected();

  }





  private SensorListener mListener;

  private ShakeListener cb;

  private SensorManager sensorManager;



  public ShakeDetector(Context context, ShakeListener callback) {

    cb = callback;

    mListener = new SensorListener() {

      private final double deletionForce = .8;

      private final int deletionCount = 2;

      int shakeCount = 0;

      boolean lastShakePositive = false;

      private int shakeCountTimeout = 500;



      public void onSensorChanged(int sensor, float[] values) {

        if ((values[1] > deletionForce) && !lastShakePositive) {

          (new Thread(new resetShakeCount())).start();

          shakeCount++;

          lastShakePositive = true;

        } else if ((values[1] < -deletionForce) && lastShakePositive) {

          (new Thread(new resetShakeCount())).start();

          shakeCount++;

          lastShakePositive = false;

        }

        if (shakeCount > deletionCount) {

          shakeCount = 0;

          cb.onShakeDetected();

        }

      }



      public void onAccuracyChanged(int arg0, int arg1) {

      }



      class resetShakeCount implements Runnable {

        public void run() {

          try {

            Thread.sleep(shakeCountTimeout);

            shakeCount = 0;

          } catch (InterruptedException e) {

            e.printStackTrace();

          }

        }

      }

    };

    

    

    sensorManager = (SensorManager) context.getSystemService(Context.SENSOR_SERVICE);

    sensorManager.registerListener(mListener, SensorManager.SENSOR_ACCELEROMETER,

        SensorManager.SENSOR_DELAY_FASTEST);

  }

  

  public void shutdown() {

    sensorManager.unregisterListener(mListener);

  }







}