/**
 * Global Sensor Networks (GSN) Source Code
 * Copyright (c) 2006-2014, Ecole Polytechnique Federale de Lausanne (EPFL)
 * <p/>
 * This file is part of GSN.
 * <p/>
 * GSN is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * <p/>
 * GSN is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 * <p/>
 * You should have received a copy of the GNU General Public License
 * along with GSN. If not, see <http://www.gnu.org/licenses/>.
 * <p/>
 * File: gsn-tiny/src/tinygsn/model/wrappers/AndroidAccelerometerWrapper.java
 *
 * @author Do Ngoc Hoan
 */
package tinygsn.model.wrappers;

import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.util.Log;

import java.io.Serializable;
import java.util.ArrayList;

import tinygsn.beans.DataField;
import tinygsn.beans.DataTypes;
import tinygsn.beans.StaticData;
import tinygsn.beans.StreamElement;
import tinygsn.beans.WrapperConfig;
import tinygsn.services.WrapperService;

public class AndroidAccelerometerWrapper extends AbstractWrapper implements SensorEventListener {

	public AndroidAccelerometerWrapper(WrapperConfig wc) {
		super(wc);
	}

	public AndroidAccelerometerWrapper() {
	}

	private static final String[] FIELD_NAMES = new String[]{"x", "y", "z"};
	private static final Byte[] FIELD_TYPES = new Byte[]{DataTypes.DOUBLE, DataTypes.DOUBLE, DataTypes.DOUBLE};
	private static final String[] FIELD_DESCRIPTION = new String[]{"x", "y", "z"};
	private static final String[] FIELD_TYPES_STRING = new String[]{"double", "double", "double"};

	public final Class<? extends WrapperService> getSERVICE() {
		return AccelerometerService.class;
	}

	private SensorManager mSensorManager;
	private Sensor mSensor;

	@Override
	public void runOnce() {
		mSensorManager = (SensorManager) StaticData.globalContext.getSystemService(Context.SENSOR_SERVICE);
		mSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
		updateWrapperInfo();
		try {
			if (dcDuration > 0) {
				mSensorManager.registerListener(this, mSensor, 60000); //around 16Hz
				Thread.sleep(dcDuration * 1000);
				mSensorManager.unregisterListener(this);
			}
		} catch (InterruptedException e) {
			Log.e(e.getMessage(), e.toString());
		}
	}

	@Override
	public DataField[] getOutputStructure() {
		ArrayList<DataField> output = new ArrayList<DataField>();
		for (int i = 0; i < FIELD_NAMES.length; i++)
			output.add(new DataField(FIELD_NAMES[i], FIELD_TYPES_STRING[i],
					                        FIELD_DESCRIPTION[i]));

		return output.toArray(new DataField[output.size()]);
	}

	@Override
	public String[] getFieldList() {
		return FIELD_NAMES;
	}

	@Override
	public Byte[] getFieldType() {
		return FIELD_TYPES;
	}

	@Override
	public void onAccuracyChanged(Sensor arg0, int arg1) {
	}

	@Override
	public void onSensorChanged(SensorEvent event) {
		double x = event.values[0];
		double y = event.values[1];
		double z = event.values[2];

		StreamElement streamElement = new StreamElement(FIELD_NAMES, FIELD_TYPES,
				                                               new Serializable[]{x, y, z});

		postStreamElement(streamElement);
	}

	public static class AccelerometerService extends WrapperService {

		public AccelerometerService() {
			super("accelerometerService");
		}
	}

}