import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.location.GpsStatus.Listener;
import android.location.LocationManager;

public class GpsCheck{
public Context context;
LocationManager manager;
    public GpsCheck(Context context){
      this.context=context;
        this.manager =  (LocationManager)context.getSystemService(Context.LOCATION_SERVICE);
        Listener gpsStatusListener = new Listener(){
          
            public void onGpsStatusChanged(int arg0) {
                gpsEnable();

            }
        };
        this.manager.addGpsStatusListener(gpsStatusListener);
    }

    public boolean gpsEnable(){
        //checks weather the GPS is enabled. If not, prompts the user to enable it then checks again. Returns false if the user chooses not to enable the application.
        if(!checkGpsEnabled()){
            promptEnableGps();
        }
        return true;
    }

    private boolean checkGpsEnabled(){
    	this.manager =  (LocationManager)context. getSystemService(Context.LOCATION_SERVICE);
        if ( !this.manager.isProviderEnabled( LocationManager.GPS_PROVIDER ) ) {
            return false;
        }
        return true;
    }

    private boolean promptNoGpsQuit(){
        AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(context);
        alertDialogBuilder.setMessage("Without enabling GPS this app can not function, Would you like to quit?");
        alertDialogBuilder.setCancelable(false);
        DialogInterface.OnClickListener onClick = new DialogInterface.OnClickListener(){
            public void onClick(DialogInterface dialog, int id){
                Intent callGPSSettingIntent = new Intent(
                android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                context.startActivity(callGPSSettingIntent);
            }
        };
        alertDialogBuilder.setPositiveButton("Goto Settings Page To Enable GPS", onClick);

        DialogInterface.OnClickListener onClickCancel = new DialogInterface.OnClickListener(){
            public void onClick(DialogInterface dialog, int id){
                dialog.cancel();
               
            }
        };
        alertDialogBuilder.setNegativeButton("Quit", onClickCancel);
        AlertDialog alert = alertDialogBuilder.create();
        alert.show();
        return true;
    }

    private boolean promptEnableGps(){
        AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(context);
        alertDialogBuilder.setMessage("GPS is disabled in your device. Would you like to enable it?");
        alertDialogBuilder.setCancelable(false);
        DialogInterface.OnClickListener onClick = new DialogInterface.OnClickListener(){
            public void onClick(DialogInterface dialog, int id){
                Intent callGPSSettingIntent = new Intent(
                android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                context.startActivity(callGPSSettingIntent);
            }
        };
        alertDialogBuilder.setPositiveButton("Goto Settings Page To Enable GPS", onClick);

        DialogInterface.OnClickListener onClickCancel = new DialogInterface.OnClickListener(){
            public void onClick(DialogInterface dialog, int id){
                dialog.cancel();
                promptNoGpsQuit();
            }
        };
        alertDialogBuilder.setNegativeButton("Cancel", onClickCancel);
        AlertDialog alert = alertDialogBuilder.create();
        alert.show();
        return true;
    }

}