/*
 * Copyright (c) 2010 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 pcgen.cdom.helper;

import pcgen.core.Globals;
import pcgen.core.PCClass;

public class SpellLevel implements Comparable<SpellLevel>
{

	private final PCClass pcclass;
	private final int level;

	public SpellLevel(PCClass pcc, int lvl)
	{
		pcclass = pcc;
		level = lvl;
	}

	@Override
	public String toString()
	{
		StringBuilder sb = new StringBuilder(25);
		sb.append(pcclass.toString());
		sb.append(" ");
		sb.append(level);
		return sb.toString();
	}

	/**
	 * Provide a machine readable encoding of this SpellLevel for use in storing choices.
	 * @return The encoded spell level.
	 */
	public String encodeChoice()
	{
		StringBuilder sb = new StringBuilder(40);
		sb.append("CLASS.");
		sb.append(pcclass.getKeyName());
		sb.append(";LEVEL.");
		sb.append(level);
		return sb.toString();
	}

	public static SpellLevel decodeChoice(String persistentFormat)
	{
		int loc = persistentFormat.indexOf(";LEVEL.");
		String classString;
		String levelString;
		if (loc == -1)
		{
			/*
			 * Handle old persistence
			 */
			int spaceLoc = persistentFormat.indexOf(' ');
			classString = persistentFormat.substring(0, spaceLoc);
			levelString = persistentFormat.substring(spaceLoc + 1);
		}
		else
		{
			String classText = persistentFormat.substring(0, 6);
			if (!"CLASS.".equals(classText))
			{
				return null;
			}
			classString = persistentFormat.substring(6, loc);
			levelString = persistentFormat.substring(loc + 7);
		}
		PCClass pcc =
				Globals.getContext().getReferenceContext().silentlyGetConstructedCDOMObject(
					PCClass.class, classString);
		try
		{
			int level = Integer.parseInt(levelString);
			return new SpellLevel(pcc, level);
		}
		catch (NumberFormatException e)
		{
			return null;
		}
	}

	@Override
	public int hashCode()
	{
		return level ^ pcclass.hashCode();
	}

	@Override
	public boolean equals(Object obj)
	{
		if (obj instanceof SpellLevel)
		{
			SpellLevel other = (SpellLevel) obj;
			return level == other.level && pcclass.equals(other.pcclass);
		}
		return false;
	}

	@Override
	public int compareTo(SpellLevel other)
	{
		int compareResult = pcclass.compareTo(other.pcclass);
		if (compareResult == 0)
		{
			if (level < other.level)
			{
				return -1;
			}
			else if (level > other.level)
			{
				return 1;
			}
		}
		return compareResult;
	}
}