/*
 * This file is part of Applied Energistics 2.
 * Copyright (c) 2013 - 2015, AlgorithmX2, All rights reserved.
 *
 * Applied Energistics 2 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 3 of the License, or
 * (at your option) any later version.
 *
 * Applied Energistics 2 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 Applied Energistics 2.  If not, see <http://www.gnu.org/licenses/lgpl>.
 */

package appeng.core.features;


import java.util.Optional;

import javax.annotation.Nonnull;

import com.google.common.base.Preconditions;
import com.google.common.base.Strings;

import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;

import appeng.api.definitions.IItemDefinition;
import appeng.util.Platform;


public class ItemDefinition implements IItemDefinition
{
	private final String identifier;
	private final Optional<Item> item;

	public ItemDefinition( String registryName, Item item )
	{
		Preconditions.checkArgument( !Strings.isNullOrEmpty( registryName ), "registryName" );
		this.identifier = registryName;
		this.item = Optional.ofNullable( item );
	}

	@Nonnull
	@Override
	public String identifier()
	{
		return this.identifier;
	}

	@Override
	public final Optional<Item> maybeItem()
	{
		return this.item;
	}

	@Override
	public Optional<ItemStack> maybeStack( final int stackSize )
	{
		return this.item.map( item -> new ItemStack( item, stackSize ) );
	}

	@Override
	public boolean isEnabled()
	{
		return this.item.isPresent();
	}

	@Override
	public final boolean isSameAs( final ItemStack comparableStack )
	{
		return isEnabled() && Platform.itemComparisons().isEqualItemType( comparableStack, this.maybeStack( 1 ).get() );
	}

}