/*
 * Copyright (c) Thomas Parker, 2013-14.
 * 
 * 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.meta;

import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.Collection;
import java.util.HashSet;

import pcgen.base.lang.UnreachableError;
import pcgen.base.util.CaseInsensitiveMap;

public final class CorePerspective
{

	public static final CorePerspective LANGUAGE = new CorePerspective("Granted Languages");
	public static final CorePerspective DOMAIN = new CorePerspective("Granted Domains");
	public static final CorePerspective ARMORPROF = new CorePerspective("Armor Proficiencies");
	public static final CorePerspective SHIELDPROF = new CorePerspective("Shield Proficiencies");
	
	private static CaseInsensitiveMap<CorePerspective> map = null;
	
	private String name;

	private CorePerspective(String name)
	{
		this.name = name;
	}

	@Override
	public String toString()
	{
		return name;
	}

	static
	{
		buildMap();
	}

	private static void buildMap()
	{
		map = new CaseInsensitiveMap<>();
		Field[] fields = CorePerspective.class.getDeclaredFields();
		for (Field field : fields)
		{
			int mod = field.getModifiers();

			if (Modifier.isStatic(mod) && Modifier.isFinal(mod)
					&& Modifier.isPublic(mod))
			{
				try
				{
					Object obj = field.get(null);
					if (obj instanceof CorePerspective)
					{
						map.put(field.getName(), (CorePerspective) obj);
					}
				}
				catch (IllegalArgumentException | IllegalAccessException e)
				{
					throw new UnreachableError(e);
				}
			}
		}
	}

	public static Collection<CorePerspective> getAllConstants()
	{
		return new HashSet<>(map.values());
	}
}