/*
 * Copyright (c) Thomas Parker, 2009.
 * 
 * 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.facet;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import pcgen.cdom.enumeration.CharID;
import pcgen.cdom.facet.base.AbstractCNASEnforcingFacet;
import pcgen.cdom.facet.event.DataFacetChangeEvent;
import pcgen.cdom.helper.CNAbilitySelection;

/**
 * DirectAbilityFacet is a Facet that tracks the CategorizedAbilitySelection
 * that have been granted to a Player Character.
 * 
 * @author Thomas Parker (thpr [at] yahoo.com)
 */
public class DirectAbilityFacet extends AbstractCNASEnforcingFacet
{

	public void removeAll(CharID id, Object source)
	{
		if (source == null)
		{
			throw new IllegalArgumentException(
				"Attempt to remove object with null source from list");
		}
		List<List<SourcedCNAS>> list = getList(id);
		if (list == null)
		{
			return;
		}
		List<CNAbilitySelection> removed = new ArrayList<>();
		List<CNAbilitySelection> added = new ArrayList<>();
		for (Iterator<List<SourcedCNAS>> listIT = list.iterator(); listIT
			.hasNext();)
		{
			List<SourcedCNAS> array = listIT.next();
			int length = array.size();
			//Iterate backwards, so that we remove harmless items first
			for (int j = length - 1; j >= 0; j--)
			{
				SourcedCNAS sc = array.get(j);
				if (source.equals(sc.source))
				{
					//fix the array here
					array.remove(j);
					boolean needRemove = true;
					if (!array.isEmpty())
					{
						CNAbilitySelection newPrimary = array.get(0).cnas;
						//Only fire if the CNAS differs to avoid churn
						if (!sc.cnas.equals(newPrimary) && (j == 0))
						{
							added.add(newPrimary);
						}
						else
						{
							needRemove = false;
						}
					}
					if (needRemove)
					{
						removed.add(sc.cnas);
					}
				}
			}
			if (array.isEmpty())
			{
				listIT.remove();
			}
		}
		for (CNAbilitySelection cnas : removed)
		{
			fireDataFacetChangeEvent(id, cnas,
				DataFacetChangeEvent.DATA_REMOVED);
		}
		for (CNAbilitySelection cnas : added)
		{
			fireDataFacetChangeEvent(id, cnas, DataFacetChangeEvent.DATA_ADDED);
		}
	}
}