/*
 * 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.parts;


import java.io.IOException;

import io.netty.buffer.ByteBuf;

import net.minecraft.item.ItemStack;

import appeng.api.implementations.IPowerChannelState;
import appeng.api.networking.GridFlags;
import appeng.api.networking.events.MENetworkChannelsChanged;
import appeng.api.networking.events.MENetworkEventSubscribe;
import appeng.api.networking.events.MENetworkPowerStatusChange;
import appeng.me.GridAccessException;


public abstract class PartBasicState extends AEBasePart implements IPowerChannelState
{

	protected static final int POWERED_FLAG = 1;
	protected static final int CHANNEL_FLAG = 2;

	private int clientFlags = 0; // sent as byte.

	public PartBasicState( final ItemStack is )
	{
		super( is );
		this.getProxy().setFlags( GridFlags.REQUIRE_CHANNEL );
	}

	@MENetworkEventSubscribe
	public void chanRender( final MENetworkChannelsChanged c )
	{
		this.getHost().markForUpdate();
	}

	@MENetworkEventSubscribe
	public void powerRender( final MENetworkPowerStatusChange c )
	{
		this.getHost().markForUpdate();
	}

	@Override
	public void writeToStream( final ByteBuf data ) throws IOException
	{
		super.writeToStream( data );

		this.setClientFlags( 0 );

		try
		{
			if( this.getProxy().getEnergy().isNetworkPowered() )
			{
				this.setClientFlags( this.getClientFlags() | POWERED_FLAG );
			}

			if( this.getProxy().getNode().meetsChannelRequirements() )
			{
				this.setClientFlags( this.getClientFlags() | CHANNEL_FLAG );
			}

			this.setClientFlags( this.populateFlags( this.getClientFlags() ) );
		}
		catch( final GridAccessException e )
		{
			// meh
		}

		data.writeByte( (byte) this.getClientFlags() );
	}

	protected int populateFlags( final int cf )
	{
		return cf;
	}

	@Override
	public boolean readFromStream( final ByteBuf data ) throws IOException
	{
		final boolean eh = super.readFromStream( data );

		final int old = this.getClientFlags();
		this.setClientFlags( data.readByte() );

		return eh || old != this.getClientFlags();
	}

	@Override
	public boolean isPowered()
	{
		return ( this.getClientFlags() & POWERED_FLAG ) == POWERED_FLAG;
	}

	@Override
	public boolean isActive()
	{
		return ( this.getClientFlags() & CHANNEL_FLAG ) == CHANNEL_FLAG;
	}

	public int getClientFlags()
	{
		return this.clientFlags;
	}

	private void setClientFlags( final int clientFlags )
	{
		this.clientFlags = clientFlags;
	}
}