/*
 * This file is part of Applied Energistics 2.
 * Copyright (c) 2013 - 2014, 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.me.energy;


import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

import appeng.api.networking.energy.IEnergyWatcher;
import appeng.api.networking.energy.IEnergyWatcherHost;
import appeng.me.cache.EnergyGridCache;


/**
 * Maintain my interests, and a global watch list, they should always be fully synchronized.
 */
public class EnergyWatcher implements IEnergyWatcher
{

	private final EnergyGridCache gsc;
	private final IEnergyWatcherHost watcherHost;
	private final Set<EnergyThreshold> myInterests = new HashSet<EnergyThreshold>();

	public EnergyWatcher( final EnergyGridCache cache, final IEnergyWatcherHost host )
	{
		this.gsc = cache;
		this.watcherHost = host;
	}

	public void post( final EnergyGridCache energyGridCache )
	{
		this.watcherHost.onThresholdPass( energyGridCache );
	}

	public IEnergyWatcherHost getHost()
	{
		return this.watcherHost;
	}

	@Override
	public boolean add( final double amount )
	{
		final EnergyThreshold eh = new EnergyThreshold( amount, this );

		if( this.myInterests.contains( eh ) )

		{
			return false;
		}

		return this.gsc.registerEnergyInterest( eh ) && this.myInterests.add( eh );
	}

	@Override
	public boolean remove( final double amount )
	{
		final EnergyThreshold eh = new EnergyThreshold( amount, this );

		return this.myInterests.remove( eh ) && this.gsc.unregisterEnergyInterest( eh );
	}

	@Override
	public void reset()
	{
		for( Iterator<EnergyThreshold> iterator = myInterests.iterator(); iterator.hasNext(); )
		{
			final EnergyThreshold threshold = iterator.next();

			this.gsc.unregisterEnergyInterest( threshold );
			iterator.remove();
		}
	}

}