/*
 * PreWeaponProficiencyParser.java
 *
 * Copyright 2003 (C) Chris Ward <frugal@purplewombat.co.uk>
 *
 * 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
 *
 * Created on 18-Dec-2003
 *
 * Current Ver: $Revision$
 *
 *
 *
 */
package plugin.pretokens.parser;

import pcgen.core.prereq.Prerequisite;
import pcgen.persistence.PersistenceLayerException;
import pcgen.persistence.lst.prereq.AbstractPrerequisiteListParser;

/**
 * A prerequisite parser class that handles the parsing of pre weaponprof tokens.
 *
 */
public class PreWeaponProfParser extends AbstractPrerequisiteListParser
{
	/**
	 * Get the type of prerequisite handled by this token.
	 * @return the type of prerequisite handled by this token.
	 */
    @Override
	public String[] kindsHandled()
	{
		return new String[]{"WEAPONPROF"};
	}

	/**
	 * This operation performs the actual parsing.
	 * @param kind the kind of the prerequisite (less the "PRE" prefix)
	 * @param formula The body of the prerequisite;
	 * @param invertResult If the prerequisite should invert the result
	 * before it is returned
	 * @param overrideQualify
	 *           if set true, this prerequisite will be enforced in spite
	 *           of any "QUALIFY" tag that may be present.
	 *
	 * @return a object for testing the prerequisite
	 * @throws PersistenceLayerException
	 */
	@Override
	public Prerequisite parse(String kind,
	                          String formula,
	                          boolean invertResult,
	                          boolean overrideQualify) throws PersistenceLayerException
	{
		Prerequisite prereq = super.parse(kind, formula, invertResult, overrideQualify);

		doTypeInvertFixUp(prereq);

		return prereq;
	}

	private void doTypeInvertFixUp(Prerequisite prereq)
	{
		if ("weaponprof".equalsIgnoreCase(prereq.getKind()))
		{
			if (prereq.getKey().startsWith("TYPE"))
			{
				prereq.setCountMultiples(true);
			}
			else if (prereq.getKey().startsWith("["))
			{
				final int length   = prereq.getKey().length() - 1;
				final int rBracket = prereq.getKey().lastIndexOf(']');
				final int endIndex = Math.max(length, rBracket);

				final String key = prereq.getKey().substring(1, endIndex);

				prereq.setKey(key);
				prereq.setOperator(prereq.getOperator().invert());
			}
		}


		/*
		 * In case of PREMULT (e.g 'PREWEAPONPROF:1,TYPE.Martial,Chain (Spiked)',
		 * need to check all sub-prereqs
		 */
		for (Prerequisite subReq : prereq.getPrerequisites())
		{
			doTypeInvertFixUp(subReq);
		}
	}

	@Override
	protected boolean allowsNegate()
	{
		return true;
	}
}