Applied-Energistics-2/src/main/java/appeng/parts/p2p/PartP2PLight.java

/*
 * 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.p2p;


import java.io.IOException;
import java.util.List;

import io.netty.buffer.ByteBuf;

import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.util.math.BlockPos;
import net.minecraft.world.IBlockAccess;
import net.minecraft.world.World;

import appeng.api.networking.IGridNode;
import appeng.api.networking.events.MENetworkChannelsChanged;
import appeng.api.networking.events.MENetworkPowerStatusChange;
import appeng.api.networking.ticking.IGridTickable;
import appeng.api.networking.ticking.TickRateModulation;
import appeng.api.networking.ticking.TickingRequest;
import appeng.api.parts.IPartModel;
import appeng.core.settings.TickRates;
import appeng.items.parts.PartModels;
import appeng.me.GridAccessException;


public class PartP2PLight extends PartP2PTunnel<PartP2PLight> implements IGridTickable
{

	private static final P2PModels MODELS = new P2PModels( "part/p2p/p2p_tunnel_light" );

	@PartModels
	public static List<IPartModel> getModels()
	{
		return MODELS.getModels();
	}

	private int lastValue = 0;
	private int opacity = -1;

	public PartP2PLight( final ItemStack is )
	{
		super( is );
	}

	@Override
	public void chanRender( final MENetworkChannelsChanged c )
	{
		this.onTunnelNetworkChange();
		super.chanRender( c );
	}

	@Override
	public void powerRender( final MENetworkPowerStatusChange c )
	{
		this.onTunnelNetworkChange();
		super.powerRender( c );
	}

	@Override
	public void writeToStream( final ByteBuf data ) throws IOException
	{
		super.writeToStream( data );
		data.writeInt( this.isOutput() ? this.lastValue : 0 );
		data.writeInt( this.opacity );
	}

	@Override
	public boolean readFromStream( final ByteBuf data ) throws IOException
	{
		super.readFromStream( data );
		final int oldValue = this.lastValue;
		final int oldOpacity = this.opacity;

		this.lastValue = data.readInt();
		this.opacity = data.readInt();

		this.setOutput( this.lastValue > 0 );
		return this.lastValue != oldValue || oldOpacity != this.opacity;
	}

	private boolean doWork()
	{
		if( this.isOutput() )
		{
			return false;
		}

		final TileEntity te = this.getTile();
		final World w = te.getWorld();

		final int newLevel = w.getLightFromNeighbors( te.getPos().offset( this.getSide().getFacing() ) );

		if( this.lastValue != newLevel && this.getProxy().isActive() )
		{
			this.lastValue = newLevel;
			try
			{
				for( final PartP2PLight out : this.getOutputs() )
				{
					out.setLightLevel( this.lastValue );
				}
			}
			catch( final GridAccessException e )
			{
				// :P
			}
			return true;
		}
		return false;
	}

	@Override
	public void onNeighborChanged( IBlockAccess w, BlockPos pos, BlockPos neighbor )
	{
		if( this.isOutput() && pos.offset( this.getSide().getFacing() ).equals( neighbor ) )
		{
			this.opacity = -1;
			this.getHost().markForUpdate();
		}
		else
		{
			this.doWork();
		}
	}

	@Override
	public int getLightLevel()
	{
		if( this.isOutput() && this.isPowered() )
		{
			return this.blockLight( this.lastValue );
		}

		return 0;
	}

	private void setLightLevel( final int out )
	{
		this.lastValue = out;
		this.getHost().markForUpdate();
	}

	private int blockLight( final int emit )
	{
		if( this.opacity < 0 )
		{
			final TileEntity te = this.getTile();
			this.opacity = 255 - te.getWorld().getBlockLightOpacity( te.getPos().offset( this.getSide().getFacing() ) );
		}

		return (int) ( emit * ( this.opacity / 255.0f ) );
	}

	@Override
	public void readFromNBT( final NBTTagCompound tag )
	{
		super.readFromNBT( tag );
		this.lastValue = tag.getInteger( "lastValue" );
	}

	@Override
	public void writeToNBT( final NBTTagCompound tag )
	{
		super.writeToNBT( tag );
		tag.setInteger( "lastValue", this.lastValue );
	}

	@Override
	public void onTunnelConfigChange()
	{
		this.onTunnelNetworkChange();
	}

	@Override
	public void onTunnelNetworkChange()
	{
		if( this.isOutput() )
		{
			try
			{
				for( PartP2PLight src : this.getInputs() )
				{
					if( src != null && src.getProxy().isActive() )
					{
						this.setLightLevel( src.lastValue );
					}
					else
					{
						this.getHost().markForUpdate();
					}
				}
			}
			catch( GridAccessException e )
			{
				e.printStackTrace();
			}
		}
		else
		{
			this.doWork();
		}
	}

	@Override
	public TickingRequest getTickingRequest( final IGridNode node )
	{
		return new TickingRequest( TickRates.LightTunnel.getMin(), TickRates.LightTunnel.getMax(), false, false );
	}

	@Override
	public TickRateModulation tickingRequest( final IGridNode node, final int ticksSinceLastCall )
	{
		return this.doWork() ? TickRateModulation.URGENT : TickRateModulation.SLOWER;
	}

	public float getPowerDrainPerTick()
	{
		return 0.5f;
	}

	@Override
	public IPartModel getStaticModels()
	{
		return MODELS.getModel( this.isPowered(), this.isActive() );
	}

}