/*
 * Copyright (c) Thomas Parker, 2013.
 * 
 * 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.Collection;
import java.util.List;

import pcgen.cdom.enumeration.CharID;
import pcgen.cdom.facet.base.AbstractSourcedListFacet;
import pcgen.cdom.facet.model.LanguageFacet;
import pcgen.cdom.meta.CorePerspective;
import pcgen.cdom.meta.CorePerspectiveDB;
import pcgen.cdom.meta.FacetBehavior;
import pcgen.cdom.meta.PerspectiveLocation;
import pcgen.core.Language;

/**
 * AutoLanguageFacet is a Facet that tracks the Languages that have been granted
 * to a Player Character through the AUTO:LANG and LANGAUTO tokens
 * 
 * @author Thomas Parker (thpr [at] yahoo.com)
 */
public class AutoLanguageGrantedFacet extends
		AbstractSourcedListFacet<CharID, Language> implements PerspectiveLocation
{

	private AutoLanguageFacet autoLanguageFacet;

	private LanguageFacet languageFacet;
	
	public boolean update(CharID id)
	{
		Collection<Language> current = getSet(id);
		Collection<Language> qualified = autoLanguageFacet.getAutoLanguage(id);
		List<Language> toRemove = new ArrayList<>(current);
		toRemove.removeAll(qualified);
		List<Language> toAdd = new ArrayList<>(qualified);
		toAdd.removeAll(current);
		for (Language lang : toRemove)
		{
			remove(id, lang, autoLanguageFacet);
		}
		for (Language lang : toAdd)
		{
			add(id, lang, autoLanguageFacet);
		}
		return !toRemove.isEmpty() || !toAdd.isEmpty();
	}

	public void setAutoLanguageFacet(AutoLanguageFacet autoLanguageFacet)
	{
		this.autoLanguageFacet = autoLanguageFacet;
	}

	public void setLanguageFacet(LanguageFacet languageFacet)
	{
		this.languageFacet = languageFacet;
	}

	public void init()
	{
		addDataFacetChangeListener(languageFacet);
		CorePerspectiveDB.register(CorePerspective.LANGUAGE, FacetBehavior.CONDITIONAL_GRANTED, this);
		CorePerspectiveDB.registerVirtualParent(this, autoLanguageFacet);
	}

	@Override
	public String getIdentity()
	{
		return "AUTO:LANG|<ref> (passed defined prerequisites)";
	}
}