AsyncStopFavoriteAction.java
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	/*
	BusTO - Middleware components
	Copyright (C) 2016 Fabio Mazza

	This program 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.

	This program 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.

	You should have received a copy of the GNU General Public License
	along with this program. If not, see <http://www.gnu.org/licenses/>.
	*/

	package it.reyboz.bustorino.middleware;

	import android.content.Context;
	import android.database.sqlite.SQLiteDatabase;
	import android.net.Uri;
	import android.os.AsyncTask;
	import android.util.Log;
	import android.widget.Toast;
	import it.reyboz.bustorino.R;
	import it.reyboz.bustorino.backend.Stop;
	import it.reyboz.bustorino.data.AppDataProvider;
	import it.reyboz.bustorino.data.UserDB;

	/**
	* Handler to add or remove or toggle a Stop in your favorites
	*/
	public class AsyncStopFavoriteAction extends AsyncTask<Stop, Void, Boolean> {
	private final Context context;
	private final Uri FAVORITES_URI = AppDataProvider.getUriBuilderToComplete().appendPath(
	AppDataProvider.FAVORITES).build();

	/**
	* Kind of actions available
	*/
	public enum Action { ADD, REMOVE, TOGGLE , UPDATE};

	/**
	* Action chosen
	*
	* Note that TOGGLE is not converted to ADD or REMOVE.
	*/
	private Action action;

	// extra stuff to do after we've done it
	private ResultListener listener;
	/**
	* Constructor
	*
	* @param context
	* @param action
	*/
	public AsyncStopFavoriteAction(Context context, Action action, ResultListener listener) {
	this.context = context.getApplicationContext();
	this.action = action;
	this.listener = listener;
	}

	@Override
	protected Boolean doInBackground(Stop... stops) {
	boolean result = false;

	Stop stop = stops[0];

	// check if the request has sense
	if(stop != null) {

	// get a writable database
	UserDB userDatabase = new UserDB(context);
	SQLiteDatabase db = userDatabase.getWritableDatabase();

	// eventually toggle the status
	if(Action.TOGGLE.equals(action)) {
	if(UserDB.isStopInFavorites(db, stop.ID)) {
	action = Action.REMOVE;
	} else {
	action = Action.ADD;
	}
	}

	// at this point the action is just ADD or REMOVE

	// add or remove?
	if(Action.ADD.equals(action)) {
	// add
	result = UserDB.addOrUpdateStop(stop, db);
	} else if (Action.UPDATE.equals(action)){

	result = UserDB.updateStop(stop, db);
	} else {
	// remove
	result = UserDB.deleteStop(stop, db);
	}

	// please sir, close the door
	db.close();
	}

	return result;
	}

	/**
	* Callback fired when everything was done
	*
	* @param result
	*/
	@Override
	protected void onPostExecute(Boolean result) {
	super.onPostExecute(result);

	if(result) {
	UserDB.notifyContentProvider(context);
	// at this point the action should be just ADD or REMOVE
	if(Action.ADD.equals(action)) {
	// now added
	Toast.makeText(this.context, R.string.added_in_favorites, Toast.LENGTH_SHORT).show();
	} else if (Action.REMOVE.equals(action)) {
	// now removed
	Toast.makeText(this.context, R.string.removed_from_favorites, Toast.LENGTH_SHORT).show();
	}
	} else {
	// wtf
	Toast.makeText(this.context, R.string.cant_add_to_favorites, Toast.LENGTH_SHORT).show();
	}
	listener.doStuffWithResult(result);
	Log.d("BusTO FavoritesAction", "Action "+action+" completed");
	}

	public interface ResultListener{
	/**
	* Do what you need to to update the UI with the result
	* @param result true if the action is done
	*/
	void doStuffWithResult(Boolean result);
	}

	}

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