package com.attilapalfi.exceptional.services;

import javax.inject.Inject;

import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.IBinder;
import android.widget.Toast;
import com.attilapalfi.exceptional.R;
import com.attilapalfi.exceptional.dependency_injection.Injector;

/**
 * Created by Attila on 2015-06-20.
 */
public class LocationService extends Service implements LocationListener {
    private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 100; // 100 meters
    private static final long MIN_TIME_BETWEEN_UPDATES = 1000 * 10; // 10 seconds

    @Inject Context context;
    private LocationManager locationManager;
    private Location location;
    private String currentProvider;
    private boolean locationEnabled = false;

    public LocationService( ) {
        Injector.INSTANCE.getApplicationComponent().inject( this );
        locationManager = (LocationManager) context.getSystemService( LOCATION_SERVICE );
        initLocationManager();
    }

    public Location getLocation( ) throws LocationException {
        initLocationManager();
        handleDisabledLocationServices();
        location = locationManager.getLastKnownLocation( currentProvider );
        handleNullLocation();
        return location;
    }

    private void initLocationManager( ) {
        Criteria criteria = new Criteria();
        criteria.setPowerRequirement( Criteria.POWER_LOW );
        currentProvider = locationManager.getBestProvider( criteria, true );
        locationEnabled = currentProvider != null;
        if ( locationEnabled ) {
            locationManager.requestLocationUpdates(
                    currentProvider,
                    MIN_TIME_BETWEEN_UPDATES,
                    MIN_DISTANCE_CHANGE_FOR_UPDATES, this );
        }
    }

    private void handleDisabledLocationServices( ) throws LocationException {
        if ( !locationEnabled ) {
            Toast.makeText( context, "Enable location services and restart the application, to throw exceptions.", Toast.LENGTH_LONG ).show();
            throw new LocationException( "Location services is not enabled." );
        }
    }

    private void handleNullLocation( ) throws LocationException {
        if ( location == null ) {
            Toast.makeText( context, "Location services is enabled, but location was null.", Toast.LENGTH_LONG ).show();
            throw new LocationException( "Location services is enabled, but location was null." );
        }
    }

    public void stopUsingGps( ) {
        if ( locationManager != null ) {
            locationManager.removeUpdates( this );
        }
    }

    @Override
    public void onLocationChanged( Location location ) {
        this.location = location;
    }

    @Override
    public void onProviderDisabled( String provider ) {
    }

    @Override
    public void onProviderEnabled( String provider ) {
    }

    @Override
    public void onStatusChanged( String provider, int status, Bundle extras ) {
    }

    @Override
    public IBinder onBind( Intent arg0 ) {
        return null;
    }
}