/*

 * Quoridor server and related libraries

 * Copyright (C) 2009-2010 Jaroslav Tulach <jaroslav.tulach@apidesign.org>

 *

 * 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 cz.xelfi.quoridor.statistics.EloList;

import cz.xelfi.quoridor.webidor.GameId;

import cz.xelfi.quoridor.webidor.GameStatus;

import javax.ws.rs.GET;

import javax.ws.rs.Path;

import javax.ws.rs.PathParam;

import javax.ws.rs.Produces;

import javax.ws.rs.core.MediaType;

import java.util.ArrayList;

import java.util.Calendar;

import java.util.GregorianCalendar;

/**

 *

 * @author Martin Rexa

 */

public final class Elo {

    private EloList list;

    private ArrayList<EloList> listHistory;

    private boolean firstGame;

    static long day = 1000 * 60 * 60 * 24;

    public Elo(){

        listHistory = new ArrayList<EloList>();

        list = new EloList();

        listHistory.add(list);

        firstGame = true;

    }

    public void processGame(GameId gId){

        GameStatus status = gId.getStatus();

        splitList(gId.getModified());

        if(status.equals(GameStatus.whiteWon)){

            list.putResult(gId.getWhite(), gId.getBlack());

        }else if(status.equals(GameStatus.blackWon)){

            list.putResult(gId.getBlack(), gId.getWhite());

        }

    }

    private void splitList(long gameModified){

        if(firstGame){

            firstGame = false;

            list.setEndDate(computeListEndDate(gameModified));

        }else{

            if(gameModified > list.getEndDate()){

                list = new EloList(list);

                listHistory.add(0,list);

                list.setEndDate(computeListEndDate(gameModified));

            }

        }

    }

    private long computeListEndDate(long modified){

        Calendar now = new GregorianCalendar();

        Calendar cModified = new GregorianCalendar();

        cModified.setTimeInMillis(modified);

        Calendar result = new GregorianCalendar();

        result.clear();

        result.set(Calendar.YEAR, cModified.get(Calendar.YEAR));

        result.set(Calendar.MONTH, cModified.get(Calendar.MONTH)+1);

        return result.getTimeInMillis()-1;

    }

    @GET

    @Path("list")

    @Produces({ MediaType.APPLICATION_JSON, MediaType.TEXT_XML })

    public EloList getList(){

        return list;

    }

    @GET

    @Path("list/{id}")

    @Produces({ MediaType.APPLICATION_JSON, MediaType.TEXT_XML })

    public EloList getHistoryList(@PathParam("id") Integer id){

        if(id == null)

            return null;

        if(id >= listHistory.size())

            return null;

        return listHistory.get(id);

    }

    @GET

    @Path("{username}")

    @Produces(MediaType.TEXT_PLAIN)

    public String getElo(@PathParam("username") String id){

        list.getElo(id);

        return Double.toString(list.getElo(id));

    }

}