/*
 * Copyright (c) 2008 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.lsttokens.spell;

import java.util.Collection;
import java.util.StringTokenizer;

import pcgen.cdom.base.Constants;
import pcgen.cdom.enumeration.ListKey;
import pcgen.cdom.enumeration.Type;
import pcgen.core.spell.Spell;
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;

/**
 * Class deals with ITEM Token
 */
public class ItemToken extends AbstractTokenWithSeparator<Spell> implements
		CDOMPrimaryToken<Spell>
{

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

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

	@Override
	protected ParseResult parseTokenWithSeparator(LoadContext context,
		Spell spell, String value)
	{
		StringTokenizer aTok = new StringTokenizer(value, Constants.COMMA);

		while (aTok.hasMoreTokens())
		{
			String tokString = aTok.nextToken();
			int bracketLoc = tokString.indexOf('[');
			if (bracketLoc == 0)
			{
				// Check ends with bracket
				if (tokString.lastIndexOf(']') != tokString.length() - 1)
				{
					return new ParseResult.Fail("Invalid " + getTokenName()
							+ ": mismatched open Bracket: " + tokString
							+ " in " + value, context);
				}
				String substring = tokString.substring(1,
						tokString.length() - 1);
				if (substring.isEmpty())
				{
					return new ParseResult.Fail("Invalid " + getTokenName()
							+ ": cannot be empty item in brackets []", context);
				}
				context.getObjectContext().addToList(spell,
						ListKey.PROHIBITED_ITEM, Type.getConstant(substring));
			}
			else
			{
				if (tokString.lastIndexOf(']') != -1)
				{
					return new ParseResult.Fail("Invalid " + getTokenName()
							+ ": mismatched close Bracket: " + tokString
							+ " in " + value, context);
				}
				context.getObjectContext().addToList(spell, ListKey.ITEM,
						Type.getConstant(tokString));
			}
		}
		return ParseResult.SUCCESS;
	}

	@Override
	public String[] unparse(LoadContext context, Spell spell)
	{
		Changes<Type> changes = context.getObjectContext().getListChanges(
				spell, ListKey.ITEM);
		Changes<Type> proChanges = context.getObjectContext().getListChanges(
				spell, ListKey.PROHIBITED_ITEM);
		Collection<Type> changeAdded = changes.getAdded();
		Collection<Type> proAdded = proChanges.getAdded();
		StringBuilder sb = new StringBuilder();
		boolean needComma = false;
		if (changeAdded != null)
		{
			for (Type t : changeAdded)
			{
				if (needComma)
				{
					sb.append(Constants.COMMA);
				}
				sb.append(t.toString());
				needComma = true;
			}
		}
		if (proAdded != null)
		{
			for (Type t : proAdded)
			{
				if (needComma)
				{
					sb.append(Constants.COMMA);
				}
				sb.append('[').append(t.toString()).append(']');
				needComma = true;
			}
		}
		if (sb.length() == 0)
		{
			return null;
		}
		return new String[] { sb.toString() };
	}

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