/**
 * Global Sensor Networks (GSN) Source Code
 * Copyright (c) 2006-2015, 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/publishers/OpportunisticGSNAPISubscriber.java
 *
 * @author Schaer Marc
 */
package tinygsn.model.subscribers;

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.util.Log;

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Locale;

import tinygsn.beans.StaticData;
import tinygsn.beans.Subscription;
import tinygsn.model.subscribers.utils.RetrieveDataTask;

public class PeriodicGSNAPISubscriber extends AbstractSubscriber {

	public PeriodicGSNAPISubscriber(Subscription su) {
		super(su);
	}

	private final static String LOGTAG = "PeriodicDataSub";


	@Override
	public long getNextRun() {
		long currentTime = System.currentTimeMillis();
		if (su.getLastTime() + su.getIterationTime() > currentTime){
			return su.getLastTime() + su.getIterationTime() - currentTime;
		}else{
			// if deadline is passed, lets try at next iteration
			return su.getIterationTime() - (currentTime - su.getLastTime()) % su.getIterationTime();
		}
	}

	@Override
	public void retrieve(long until) {
		ConnectivityManager connManager = (ConnectivityManager) StaticData.globalContext.getSystemService(Context.CONNECTIVITY_SERVICE);
		if (connManager.getActiveNetworkInfo() == null) {
			log(StaticData.globalContext, "No Network for uploading data");
		} else {
			try {
                Calendar calf = Calendar.getInstance();
                calf.setTimeInMillis(su.getLastTime());
                Calendar calt = Calendar.getInstance();
                calt.setTimeInMillis(until);
                String fro = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss", Locale.ENGLISH).format(calf.getTime());
                String to = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss", Locale.ENGLISH).format(calt.getTime());
                String url = su.getUrl() + "/rest/sensors/" + su.getVsname() + "?from=" + fro + "&to=" + to;
				new RetrieveDataTask(su).execute(url).get();
			} catch (Exception e) {
				Log.e(LOGTAG, e.getMessage());
				e.printStackTrace();
			}
		}
	}

	@Override
	public void runOnce() {
		long currentTime = System.currentTimeMillis();
		if (su.getLastTime() + su.getIterationTime() < currentTime){
			retrieve(currentTime);
		}
	}
}