/*
 * 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.core.sync.packets;


import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.BufferOverflowException;
import java.util.LinkedList;
import java.util.List;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;

import javax.annotation.Nullable;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;

import net.minecraft.client.Minecraft;
import net.minecraft.client.gui.GuiScreen;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraftforge.fml.common.network.internal.FMLProxyPacket;
import net.minecraftforge.fml.relauncher.Side;
import net.minecraftforge.fml.relauncher.SideOnly;

import appeng.api.storage.data.IAEItemStack;
import appeng.client.gui.implementations.GuiCraftConfirm;
import appeng.client.gui.implementations.GuiCraftingCPU;
import appeng.client.gui.implementations.GuiMEMonitorable;
import appeng.client.gui.implementations.GuiNetworkStatus;
import appeng.core.AELog;
import appeng.core.sync.AppEngPacket;
import appeng.core.sync.network.INetworkInfo;
import appeng.util.item.AEItemStack;


public class PacketMEInventoryUpdate extends AppEngPacket
{
	private static final int UNCOMPRESSED_PACKET_BYTE_LIMIT = 16 * 1024 * 1024;
	private static final int OPERATION_BYTE_LIMIT = 2 * 1024;
	private static final int TEMP_BUFFER_SIZE = 1024;
	private static final int STREAM_MASK = 0xff;

	// input.
	@Nullable
	private final List<IAEItemStack> list;
	// output...
	private final byte ref;

	@Nullable
	private final ByteBuf data;
	@Nullable
	private final GZIPOutputStream compressFrame;

	private int writtenBytes = 0;
	private boolean empty = true;

	// automatic.
	public PacketMEInventoryUpdate( final ByteBuf stream ) throws IOException
	{
		this.data = null;
		this.compressFrame = null;
		this.list = new LinkedList<IAEItemStack>();
		this.ref = stream.readByte();

		// int originalBytes = stream.readableBytes();

		final GZIPInputStream gzReader = new GZIPInputStream( new InputStream(){
			@Override
			public int read() throws IOException
			{
				if( stream.readableBytes() <= 0 )
				{
					return -1;
				}

				return stream.readByte() & STREAM_MASK;
			}
		} );

		final ByteBuf uncompressed = Unpooled.buffer( stream.readableBytes() );
		final byte[] tmp = new byte[TEMP_BUFFER_SIZE];
		while( gzReader.available() != 0 )
		{
			final int bytes = gzReader.read( tmp );
			if( bytes > 0 )
			{
				uncompressed.writeBytes( tmp, 0, bytes );
			}
		}
		gzReader.close();

		// int uncompressedBytes = uncompressed.readableBytes();
		// AELog.info( "Receiver: " + originalBytes + " -> " + uncompressedBytes );

		while( uncompressed.readableBytes() > 0 )
		{
			this.list.add( AEItemStack.loadItemStackFromPacket( uncompressed ) );
		}

		this.empty = this.list.isEmpty();
	}

	// api
	public PacketMEInventoryUpdate() throws IOException
	{
		this( (byte) 0 );
	}

	// api
	public PacketMEInventoryUpdate( final byte ref ) throws IOException
	{
		this.ref = ref;
		this.data = Unpooled.buffer( OPERATION_BYTE_LIMIT );
		this.data.writeInt( this.getPacketID() );
		this.data.writeByte( this.ref );

		this.compressFrame = new GZIPOutputStream( new OutputStream(){
			@Override
			public void write( final int value ) throws IOException
			{
				PacketMEInventoryUpdate.this.data.writeByte( value );
			}
		} );

		this.list = null;
	}

	@Override
	@SideOnly( Side.CLIENT )
	public void clientPacketData( final INetworkInfo network, final AppEngPacket packet, final EntityPlayer player )
	{
		final GuiScreen gs = Minecraft.getMinecraft().currentScreen;

		if( gs instanceof GuiCraftConfirm )
		{
			( (GuiCraftConfirm) gs ).postUpdate( this.list, this.ref );
		}

		if( gs instanceof GuiCraftingCPU )
		{
			( (GuiCraftingCPU) gs ).postUpdate( this.list, this.ref );
		}

		if( gs instanceof GuiMEMonitorable )
		{
			( (GuiMEMonitorable) gs ).postUpdate( this.list );
		}

		if( gs instanceof GuiNetworkStatus )
		{
			( (GuiNetworkStatus) gs ).postUpdate( this.list );
		}
	}

	@Nullable
	@Override
	public FMLProxyPacket getProxy()
	{
		try
		{
			this.compressFrame.close();

			this.configureWrite( this.data );
			return super.getProxy();
		}
		catch( final IOException e )
		{
			AELog.debug( e );
		}

		return null;
	}

	public void appendItem( final IAEItemStack is ) throws IOException, BufferOverflowException
	{
		final ByteBuf tmp = Unpooled.buffer( OPERATION_BYTE_LIMIT );
		is.writeToPacket( tmp );

		this.compressFrame.flush();
		if( this.writtenBytes + tmp.readableBytes() > UNCOMPRESSED_PACKET_BYTE_LIMIT )
		{
			throw new BufferOverflowException();
		}
		else
		{
			this.writtenBytes += tmp.readableBytes();
			this.compressFrame.write( tmp.array(), 0, tmp.readableBytes() );
			this.empty = false;
		}
	}

	public int getLength()
	{
		return this.data.readableBytes();
	}

	public boolean isEmpty()
	{
		return this.empty;
	}
}