/**

 * Quoridor server and related libraries

 * Copyright (C) 2009-2010 Martin Rexa

 *

 * 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.

 *

 * 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. Look for COPYING file in the top folder.

 * If not, see http://www.gnu.org/licenses/.

 */

package cz.xelfi.quoridor.statistics.resources;

import com.sun.jersey.api.container.httpserver.HttpServerFactory;

import com.sun.jersey.api.core.PackagesResourceConfig;

import com.sun.jersey.api.core.ResourceConfig;

import com.sun.jersey.spi.resource.Singleton;

import com.sun.net.httpserver.HttpServer;

import java.io.File;

import java.io.IOException;

import java.util.Comparator;

import java.util.List;

import java.util.Collections;

import java.net.ServerSocket;

import javax.ws.rs.Path;

import cz.xelfi.quoridor.webidor.resources.Games;

import cz.xelfi.quoridor.webidor.Game;

/**

 *

 * @author Martin Rexa

 */

@Path("/")

@Singleton

public class Statistics {

    static final Comparator<Game> OLDEST_FIRST = new OldestFirst();

    static Elo elo;

    static Openings openings;

    @Path("elo")

    public Elo getElo() {

        return elo;

    }

    @Path("openings")

    public Openings getOpenings() {

        return openings;

    }

    public static void main( String[] args ) throws IOException, InterruptedException

    {

        int port = 9444;

        // timeout between reprocessing games in miliseconds

        long timeout = 1000 * 60 * 60 * 24;

//        long timeout = 1000 * 10;

        try {

            port = Integer.parseInt(args[0]);

        } catch (Exception ex) {

            // OK

        }

        if (System.getProperty("quoridor.dir") == null) {

            File home = new File(System.getProperty("user.home"));

            File quoridor = new File(home, ".quoridor");

            System.setProperty("quoridor.dir", quoridor.getPath());

        }

        long lastExec = System.currentTimeMillis();

        processGames();

        HttpServer s = start(port);

        System.out.println("Statistics started at port " + port);

        Object monitor = new Object();

        // Wait until begining of next period. If timeout is one day, then next

        // processing will be done after midnight

        synchronized (monitor) {

            monitor.wait(timeout - (lastExec % timeout));

        }

        for(;;){

            processGames();

            synchronized (monitor) {

                monitor.wait(timeout);

            }

        }

    }

    public static HttpServer start(int port) throws IOException {

        if (port == -1) {

            ServerSocket ss = new ServerSocket(0);

            port =ss.getLocalPort();

            ss.close();

        }

        final String baseUri = "http://localhost:" + port + "/";

        if (System.getProperty("quoridor.dir") == null) {

            File home = new File(System.getProperty("user.home"));

            File quoridor = new File(home, ".quoridor");

            System.setProperty("quoridor.dir", quoridor.getPath());

        }

        ResourceConfig rc = new PackagesResourceConfig("cz.xelfi.quoridor.statistics");

        HttpServer server = HttpServerFactory.create(baseUri, rc);

        server.start();

        return server;

    }

    public static void processGames(){

        Elo eloTmp = new Elo();

        Openings openingsTmp = new Openings();

        final String prop = System.getProperty("quoridor.dir"); // NOI18N

        if (prop == null) {

            throw new IllegalStateException("quoridor.dir property must be specified"); // NOI18N

        }

        File path = new File(prop);

        path.mkdirs();

        File fGames = new File(path, "games");

        //fGames.mkdirs();

        Games games = new Games(fGames, null);

        List<Game> lGames = games.getGames();

        Collections.sort(lGames, OLDEST_FIRST);

        // process games

        for(Game g: lGames){

            if(g.getId().isFinished()){

                eloTmp.processGame(g.getId());

                openingsTmp.processGame(g);

            }

        }

        elo = eloTmp;

        openings = openingsTmp;

    }

    private static final class OldestFirst implements Comparator<Game> {

        public int compare(Game g1, Game g2) {

            if(g1.getId() == g2.getId())

                return 0;

            long diff = g2.getId().getModified() - g1.getId().getModified();

            if (diff != 0) {

                return diff < 0 ? 1 : -1;

            }

            return g1.getId().getId().compareTo(g2.getId().getId());

        }

    }

}