/*
 * 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.pcclass;

import java.util.ArrayList;
import java.util.List;
import java.util.StringTokenizer;

import pcgen.base.formula.Formula;
import pcgen.cdom.base.CDOMReference;
import pcgen.cdom.base.ChoiceSet;
import pcgen.cdom.base.ConcreteTransitionChoice;
import pcgen.cdom.base.Constants;
import pcgen.cdom.base.FormulaFactory;
import pcgen.cdom.base.TransitionChoice;
import pcgen.cdom.choiceset.ReferenceChoiceSet;
import pcgen.cdom.enumeration.ObjectKey;
import pcgen.cdom.list.ClassSkillList;
import pcgen.core.PCClass;
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 SKILLLIST Token
 */
public class SkilllistToken extends AbstractTokenWithSeparator<PCClass>
		implements CDOMPrimaryToken<PCClass>
{
	private static final Class<ClassSkillList> SKILLLIST_CLASS = ClassSkillList.class;

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

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

	@Override
	protected ParseResult parseTokenWithSeparator(LoadContext context,
		PCClass pcc, String value)
	{
		StringTokenizer tok = new StringTokenizer(value, Constants.PIPE);
		Formula count = FormulaFactory.getFormulaFor(tok.nextToken());
		if (!count.isValid())
		{
			return new ParseResult.Fail("Count in " + getTokenName()
					+ " was not valid: " + count.toString(), context);
		}
		if (!count.isStatic() || count.resolveStatic().intValue() <= 0)
		{
			return new ParseResult.Fail("Count in " + getTokenName() + " must be > 0", context);
		}
		if (!tok.hasMoreTokens())
		{
			return new ParseResult.Fail(getTokenName()
					+ " must have a | separating "
					+ "count from the list of possible values: " + value, context);
		}
		List<CDOMReference<ClassSkillList>> refs = new ArrayList<>();

		while (tok.hasMoreTokens())
		{
			String token = tok.nextToken();
			CDOMReference<ClassSkillList> ref;
			if (Constants.LST_ALL.equals(token))
			{
				ref = context.getReferenceContext().getCDOMAllReference(SKILLLIST_CLASS);
			}
			else
			{
				ref = context.getReferenceContext().getCDOMReference(SKILLLIST_CLASS, token);
			}
			refs.add(ref);
		}

		ReferenceChoiceSet<ClassSkillList> rcs = new ReferenceChoiceSet<>(
				refs);
		if (!rcs.getGroupingState().isValid())
		{
			return new ParseResult.Fail("Non-sensical "
					+ getTokenName()
					+ ": Contains ANY and a specific reference: " + value);
		}
		ChoiceSet<ClassSkillList> cs = new ChoiceSet<>(
				getTokenName(), rcs);
		cs.setTitle("Select class whose class-skills this class will inherit");
		TransitionChoice<ClassSkillList> tc = new ConcreteTransitionChoice<>(
				cs, count);
		context.getObjectContext().put(pcc, ObjectKey.SKILLLIST_CHOICE, tc);
		tc.setRequired(false);
		return ParseResult.SUCCESS;
	}

	@Override
	public String[] unparse(LoadContext context, PCClass pcc)
	{
		TransitionChoice<ClassSkillList> grantChanges = context
				.getObjectContext().getObject(pcc, ObjectKey.SKILLLIST_CHOICE);
		if (grantChanges == null)
		{
			// Zero indicates no Token
			return null;
		}
		StringBuilder sb = new StringBuilder();
		Formula count = grantChanges.getCount();
		if (count == null)
		{
			context.addWriteMessage("Unable to find " + getTokenName()
					+ " Count");
			return null;
		}
		sb.append(count);
		sb.append(Constants.PIPE);
		sb.append(grantChanges.getChoices().getLSTformat().replaceAll(
				Constants.COMMA, Constants.PIPE));
		return new String[] { sb.toString() };
	}

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