/*
 * $Header: CompactionIDFactory.java, 24/08/2005 22:32:43 luisantonioa Exp $
 *
 * $Author: luisantonioa $
 * $Date: 24/08/2005 22:32:43 $
 * $Revision: 1 $
 * $Log: CompactionIDFactory.java,v $
 * Revision 1  24/08/2005 22:32:43  luisantonioa
 * Added copyright notice
 *
 *
* 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 com.l2jserver.gameserver.idfactory;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.logging.Level;
import java.util.logging.Logger;

import com.l2jserver.Config;
import com.l2jserver.L2DatabaseFactory;


/**
 * This class ...
 *
 * @version $Revision: 1.2 $ $Date: 2004/06/27 08:12:59 $
 */

public class CompactionIDFactory extends IdFactory
{
	private static Logger _log = Logger.getLogger(CompactionIDFactory.class.getName());
	private int _curOID;
	private int _freeSize;
	
	protected CompactionIDFactory()
	{
		super();
		_curOID = FIRST_OID;
		_freeSize = 0;
		
		Connection con = null;
		try
		{
			con = L2DatabaseFactory.getInstance().getConnection();
			//con.createStatement().execute("drop table if exists tmp_obj_id");
			
			int[] tmp_obj_ids = extractUsedObjectIDTable();
			
			int N = tmp_obj_ids.length;
			for (int idx = 0; idx < N; idx++)
			{
				N = insertUntil(tmp_obj_ids, idx, N, con);
			}
			_curOID++;
			_log.info("IdFactory: Next usable Object ID is: " + _curOID);
			_initialized = true;
		}
		catch (Exception e)
		{
			_log.log(Level.SEVERE, "ID Factory could not be initialized correctly: " + e.getMessage(), e);
		}
		finally
		{
			L2DatabaseFactory.close(con);
		}
	}
	
	private int insertUntil(int[] tmp_obj_ids, int idx, int N, Connection con) throws SQLException
	{
		int id = tmp_obj_ids[idx];
		if (id == _curOID)
		{
			_curOID++;
			return N;
		}
		// check these IDs not present in DB
		if (Config.BAD_ID_CHECKING)
		{
			for (String check : ID_CHECKS)
			{
				PreparedStatement ps = con.prepareStatement(check);
				ps.setInt(1, _curOID);
				ps.setInt(2, id);
				ResultSet rs = ps.executeQuery();
				while (rs.next())
				{
					int badId = rs.getInt(1);
					_log.severe("Bad ID " + badId + " in DB found by: " + check);
					throw new RuntimeException();
				}
				rs.close();
				ps.close();
			}
		}
		
		int hole = id - _curOID;
		if (hole > N - idx)
			hole = N - idx;
		for (int i = 1; i <= hole; i++)
		{
			id = tmp_obj_ids[N - i];
			_log.info("Compacting DB object ID=" + id + " into " + (_curOID));
			for (String update : ID_UPDATES)
			{
				PreparedStatement ps = con.prepareStatement(update);
				ps.setInt(1, _curOID);
				ps.setInt(2, id);
				ps.execute();
				ps.close();
			}
			_curOID++;
		}
		if (hole < N - idx)
			_curOID++;
		return N - hole;
	}
	
	@Override
	public synchronized int getNextId()
	{
		/*if (_freeSize == 0)*/return _curOID++;
		/* else
		 	return _freeOIDs[--_freeSize];*/
	}
	
	@Override
	public synchronized void releaseId(int id)
	{
		//dont release ids until we are sure it isnt messing up
		/* if (_freeSize >= _freeOIDs.length)
		 {
		     int[] tmp = new int[_freeSize + STACK_SIZE_INCREMENT];
		     System.arraycopy(_freeOIDs, 0, tmp, 0, _freeSize);
		     _freeOIDs = tmp;
		 }
		 _freeOIDs[_freeSize++] = id;*/
	}
	
	@Override
	public int size()
	{
		return _freeSize + LAST_OID - FIRST_OID;
	}
}