/*
 * 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 appeng.api.networking.energy.IEnergyWatcher;


public class EnergyThreshold implements Comparable<EnergyThreshold>
{

	private final double threshold;
	private final IEnergyWatcher watcher;
	private final int watcherHash;

	public EnergyThreshold( final double lim, final IEnergyWatcher watcher )
	{
		this.threshold = lim;
		this.watcher = watcher;
		this.watcherHash = watcher.hashCode();
	}

	/**
	 * Special constructor to allow querying a for a subset of thresholds.
	 * 
	 * @param lim
	 * @param bound
	 */
	public EnergyThreshold( final double lim, final int bound )
	{
		this.threshold = lim;
		this.watcher = null;
		this.watcherHash = bound;
	}

	public IEnergyWatcher getEnergyWatcher()
	{
		return watcher;
	}

	@Override
	public int compareTo( EnergyThreshold o )
	{
		int a = Double.compare( this.threshold, o.threshold );

		if( a == 0 )
		{
			return Integer.compare( this.watcherHash, o.watcherHash );
		}

		return a;
	}

	@Override
	public int hashCode()
	{
		final int prime = 31;
		int result = 1;
		long temp;
		temp = Double.doubleToLongBits( threshold );
		result = prime * result + (int) ( temp ^ ( temp >>> 32 ) );
		result = prime * result + ( ( watcher == null ) ? 0 : watcher.hashCode() );
		return result;
	}

	@Override
	public boolean equals( Object obj )
	{
		if( this == obj )
		{
			return true;
		}
		if( obj == null )
		{
			return false;
		}
		if( getClass() != obj.getClass() )
		{
			return false;
		}

		EnergyThreshold other = (EnergyThreshold) obj;
		if( Double.doubleToLongBits( threshold ) != Double.doubleToLongBits( other.threshold ) )
		{
			return false;
		}

		if( watcher == null )
		{
			if( other.watcher != null )
			{
				return false;
			}
		}
		else if( !watcher.equals( other.watcher ) )
		{
			return false;
		}
		return true;
	}
}