/*
 * Copyright 2012 (C) Thomas Parker <thpr@users.sourceforge.net>
 * 
 * This library 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 library 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.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package plugin.lsttokens.race;

import java.util.Collection;
import java.util.Set;
import java.util.StringTokenizer;
import java.util.TreeSet;

import pcgen.cdom.base.Constants;
import pcgen.cdom.enumeration.ListKey;
import pcgen.core.Movement;
import pcgen.core.Race;
import pcgen.rules.context.Changes;
import pcgen.rules.context.LoadContext;
import pcgen.rules.persistence.token.AbstractTokenWithSeparator;
import pcgen.rules.persistence.token.CDOMPrimaryToken;
import pcgen.rules.persistence.token.ParseResult;

public class MoveToken extends AbstractTokenWithSeparator<Race> implements
		CDOMPrimaryToken<Race>
{

	@Override
	public String getTokenName()
	{
		return "MOVE";
	}

	private ParseResult validateMove(String value, String mod)
	{
		try
		{
			if (Integer.parseInt(mod) < 0)
			{
				return new ParseResult.Fail(
					"Invalid movement (cannot be negative): " + mod
						+ " in MOVE: " + value);
			}
		}
		catch (NumberFormatException nfe)
		{
			return new ParseResult.Fail(
				"Invalid movement (must be an integer >= 0): " + mod
					+ " in MOVE: " + value);
		}
		return ParseResult.SUCCESS;
	}

	@Override
	protected char separator()
	{
		return ',';
	}

	@Override
	protected ParseResult parseTokenWithSeparator(LoadContext context,
		Race obj, String value)
	{
		StringTokenizer moves = new StringTokenizer(value, Constants.COMMA);
		Movement cm;

		if (moves.countTokens() == 1)
		{
			cm = new Movement(1);
			String mod = moves.nextToken();
			ParseResult pr = validateMove(value, mod);
			if (!pr.passed())
			{
				return pr;
			}
			cm.assignMovement(0, "Walk", mod);
		}
		else
		{
			cm = new Movement(moves.countTokens() / 2);

			int x = 0;
			while (moves.countTokens() > 1)
			{
				String type = moves.nextToken();
				String mod = moves.nextToken();
				ParseResult pr = validateMove(value, mod);
				if (!pr.passed())
				{
					return pr;
				}
				cm.assignMovement(x++, type, mod);
			}
			if (moves.countTokens() != 0)
			{
				return new ParseResult.Fail("Badly formed MOVE token "
					+ "(extra value at end of list): " + value, context);
			}
		}
		cm.setMoveRatesFlag(0);
		context.getObjectContext().addToList(obj, ListKey.BASE_MOVEMENT, cm);
		return ParseResult.SUCCESS;
	}

	@Override
	public String[] unparse(LoadContext context, Race obj)
	{
		Changes<Movement> changes =
				context.getObjectContext().getListChanges(obj,
					ListKey.BASE_MOVEMENT);
		Collection<Movement> added = changes.getAdded();
		if (added == null || added.isEmpty())
		{
			// Zero indicates no Token
			return null;
		}
		Set<String> set = new TreeSet<>();
		for (Movement m : added)
		{
			if (m.getMoveRatesFlag() == 0)
			{
				StringBuilder sb = new StringBuilder();
				m.addTokenContents(sb);
				set.add(sb.toString());
			}
		}
		if (set.isEmpty())
		{
			return null;
		}
		return set.toArray(new String[set.size()]);
	}

	@Override
	public Class<Race> getTokenClass()
	{
		return Race.class;
	}
}