/*
 * 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.equipmentmodifier;

import pcgen.cdom.base.Constants;
import pcgen.cdom.enumeration.IntegerKey;
import pcgen.core.EquipmentModifier;
import pcgen.rules.context.LoadContext;
import pcgen.rules.persistence.token.AbstractNonEmptyToken;
import pcgen.rules.persistence.token.CDOMPrimaryToken;
import pcgen.rules.persistence.token.ParseResult;

/**
 * Deals with CHARGES token
 */
public class ChargesToken extends AbstractNonEmptyToken<EquipmentModifier>
		implements CDOMPrimaryToken<EquipmentModifier>
{

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

	@Override
	protected ParseResult parseNonEmptyToken(LoadContext context,
		EquipmentModifier mod, String value)
	{
		int pipeLoc = value.indexOf(Constants.PIPE);
		if (pipeLoc == -1)
		{
			return new ParseResult.Fail(getTokenName()
							+ " has no | : must be of format <min charges>|<max charges>: "
							+ value, context);
		}
		if (value.lastIndexOf(Constants.PIPE) != pipeLoc)
		{
			return new ParseResult.Fail(getTokenName()
							+ " has two | : must be of format <min charges>|<max charges>: "
							+ value, context);
		}
		String minChargeString = value.substring(0, pipeLoc);
		int minCharges;
		try
		{
			minCharges = Integer.parseInt(minChargeString);
			if (minCharges < 0)
			{
				return new ParseResult.Fail(getTokenName()
						+ " min charges must be >= zero: " + value, context);
			}
		}
		catch (NumberFormatException nfe)
		{
			return new ParseResult.Fail(getTokenName()
					+ " min charges is not an integer: " + value, context);
		}

		String maxChargeString = value.substring(pipeLoc + 1);
		int maxCharges;
		try
		{
			maxCharges = Integer.parseInt(maxChargeString);
			/*
			 * No need to test max for negative, since min was tested and there
			 * is a later test for max >= min
			 */
		}
		catch (NumberFormatException nfe)
		{
			return new ParseResult.Fail(getTokenName()
					+ " max charges is not an integer: " + value, context);
		}

		if (minCharges > maxCharges)
		{
			return new ParseResult.Fail(getTokenName()
					+ " max charges must be >= min charges: " + value, context);
		}

		context.getObjectContext().put(mod, IntegerKey.MIN_CHARGES,
				minCharges);
		context.getObjectContext().put(mod, IntegerKey.MAX_CHARGES,
				maxCharges);
		return ParseResult.SUCCESS;
	}

	@Override
	public String[] unparse(LoadContext context, EquipmentModifier mod)
	{
		Integer max = context.getObjectContext().getInteger(mod,
				IntegerKey.MAX_CHARGES);
		Integer min = context.getObjectContext().getInteger(mod,
				IntegerKey.MIN_CHARGES);
		if (max == null && min == null)
		{
			return null;
		}
		if (max == null || min == null)
		{
			context
				.addWriteMessage("EquipmentModifier requires both MAX_CHARGES and MIN_CHARGES for "
					+ getTokenName() + " if one of the two is present");
			return null;
		}
		int minInt = min.intValue();
		if (minInt < 0)
		{
			context
					.addWriteMessage("EquipmentModifier requires MIN_CHARGES be > 0");
			return null;
		}
		if (max.intValue() < minInt)
		{
			context
					.addWriteMessage("EquipmentModifier requires MAX_CHARGES be "
							+ "greater than MIN_CHARGES for " + getTokenName());
			return null;
		}
		return new String[] { min + Constants.PIPE + max };
	}

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