/*** Location Service ***
 *** background service for monitoring location
 * 
 * Copyright (c) 2014
 * Randroid Solutions (http://www.randroidsolutions.com/)
 * All Rights Reserved.
 *
 * The right to use, copy, modify, merge, publish, distribute, sublicense, 
 * and/or sell copies of this software, and/or to permit persons to whom the 
 * software is furnished to do so is NOT PERMITTED without the written consent
 * of Randroid Solutions [dev@randroidsolutions.com].
 *
 */


package com.randroid.library.gps;

import android.app.Service;
import android.content.Intent;
import android.location.Location;
import android.os.Bundle;
import android.os.IBinder;

import com.randroid.library.gps.GlobalPosition.LocationAlert;
import com.randroid.library.gps.objects.GpsAddress;
import com.randroid.library.gps.objects.LocationMonitor;

public abstract class LocationService extends Service {
	public static final String ACTION = "com.randroid.gpsapi.LocationService.START";
	public static final String EXTRA_ACTION = "action";
	public static final String EXTRA_PARCEL = "parcel";
	public static final String RESULT_ERROR = "error";
	public static final String RESULT_STOPPED = "stopped";
	public static final String RESULT_UNAVAILABLE = "unavailable";
	private static GpsAddress mNavdress = null;
	private LocationAlert mAlert = null;
	private Bundle mParcel = null;
	private String mAction = null;
	
	//define our location monitor interface
	private final LocationMonitor.LocationResult mUpdateResult = new LocationMonitor.LocationResult() {
		public void update(final Location location) {
			if (mAction != null) {
				returnAction(null);
			}
			stopSelf();
		}
		public void failure(final String error) {
			if (mAction != null) {
				returnAction(error);
			}
			stopSelf();
		}
		public void unavailable() {
			if (mAction != null) {
				returnAction(RESULT_UNAVAILABLE);
			}
			stopSelf();
		};
	};	
	
	@Override
	public IBinder onBind(final Intent intent) {
		return null;
	}
	
	@Override
	public void onStart(final Intent intent, int startId) {
		//for compatibility with API levels prior to 5
		start(intent);
	}
	
	@Override
	public int onStartCommand(final Intent intent, int flags, int startId) {
		return start(intent);
	}
	
	@Override
	public void onDestroy() {
		if (mAlert != null) {
			mAlert.cancelUpdates();
			mAlert = null;
		}
		super.onDestroy();
	}
	
	public static GpsAddress getNavdress() {
		return mNavdress;
	}
	
	public static void setNavdress(final GpsAddress navdress) {
		mNavdress = navdress;
	}
	
	protected int start(final Intent intent) {
		if (intent != null) {					
			mParcel = intent.getBundleExtra(EXTRA_PARCEL);
			mAction = intent.getStringExtra(EXTRA_ACTION);

			//convert the destination address to coordinates
			//this is sometimes delayed by the geocoding service
			try {
				final Location destination = mNavdress.hasLocation() ? mNavdress.getLocation() :  
					GlobalPosition.getLocation(LocationService.this, mNavdress);
	          		
				if ((destination != null) && ((destination.getLatitude() != 0) && 
						(destination.getLongitude() != 0))) {
					//create an alert monitor for our destination
					mAlert = GlobalPosition.newAlert(this, mUpdateResult, destination);
				}
				else {
					stopSelf();
				}
			}
			catch (final Exception e) {
				stopSelf();
			}
	        
			return START_STICKY;
		}
		
		return START_NOT_STICKY;
	}	
	
	protected void returnAction(final String error) {
		try {
			final Intent intent = new Intent(mAction);
			
			intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
			intent.putExtra(RESULT_ERROR, error);
			
			if (mParcel != null) {
				intent.putExtra(EXTRA_PARCEL, mParcel);
			}
			
			startActivity(intent);		
		}
		catch (final Exception e) {}
	}
}