/*
 * Copyright (c) 2009 Tom Parker <thpr@users.sourceforge.net>
 * 
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 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 Lesser General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
 */
package plugin.converter;

import java.util.StringTokenizer;

import pcgen.cdom.base.CDOMObject;
import pcgen.gui2.converter.event.TokenProcessEvent;
import pcgen.gui2.converter.event.TokenProcessorPlugin;

public class PreDRConvertPlugin implements TokenProcessorPlugin
{

    @Override
	public String process(TokenProcessEvent tpe)
	{
		tpe.append(tpe.getKey());
		tpe.append(':');
		String formula = tpe.getValue();

		int commaLoc = formula.indexOf(',');
		if (commaLoc == -1)
		{
			return "Prerequisite " + tpe.getKey() + " must have a count: "
					+ formula;
		}
		if (commaLoc == formula.length() - 1)
		{
			return "Prerequisite " + tpe.getKey()
					+ " can not have only a count: " + formula;
		}
		String num = formula.substring(0, commaLoc);
		String rest = formula.substring(commaLoc + 1);

		try
		{
			Integer.parseInt(num);
		}
		catch (NumberFormatException nfe)
		{
			return "'" + num + "' in " + tpe.getKey()
					+ " is not a valid integer";
		}

		tpe.append(num);

		// Work rest here:

		StringTokenizer st = new StringTokenizer(rest, ",");
		while (st.hasMoreTokens())
		{
			String tok = st.nextToken();
			int equalLoc = tok.indexOf('=');
			tpe.append(',');
			tpe.append(tok);
			if (equalLoc == -1)
			{
				tpe.append("=0");
			}
		}
		tpe.consume();
		return null;
	}

    @Override
	public Class<? extends CDOMObject> getProcessedClass()
	{
		return CDOMObject.class;
	}

    @Override
	public String getProcessedToken()
	{
		return "PREDR";
	}
}