/*
 * This file is part of Applied Energistics 2.
 * Copyright (c) 2013 - 2015, 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.util.ArrayList;
import java.util.List;

import net.minecraft.item.ItemStack;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.util.EnumFacing;
import net.minecraft.util.math.BlockPos;
import net.minecraft.world.IBlockAccess;
import net.minecraftforge.common.capabilities.Capability;
import net.minecraftforge.items.CapabilityItemHandler;
import net.minecraftforge.items.IItemHandler;
import net.minecraftforge.items.wrapper.EmptyHandler;

import appeng.api.networking.IGridNode;
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;
import appeng.me.cache.helpers.TunnelCollection;
import appeng.util.Platform;
import appeng.util.inv.WrapperChainedItemHandler;


public class PartP2PItems extends PartP2PTunnel<PartP2PItems> implements IItemHandler, IGridTickable
{
	private static final float POWER_DRAIN = 2.0f;
	private static final P2PModels MODELS = new P2PModels( "part/p2p/p2p_tunnel_items" );
	private boolean partVisited = false;

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

	private int oldSize = 0;
	private boolean requested;
	private IItemHandler cachedInv;

	public PartP2PItems( final ItemStack is )
	{
		super( is );
	}

	@Override
	public void onNeighborChanged( IBlockAccess w, BlockPos pos, BlockPos neighbor )
	{
		this.cachedInv = null;
		try
		{
			if( this.isOutput() )
			{
				for( PartP2PItems input : this.getInputs() )
				{
					if( input != null )
					{
						input.onTunnelNetworkChange();
					}
				}
			}
		}
		catch( GridAccessException e )
		{
			e.printStackTrace();
		}
	}

	private IItemHandler getDestination()
	{
		this.requested = true;

		if( this.cachedInv != null )
		{
			return this.cachedInv;
		}

		final List<IItemHandler> outs = new ArrayList<IItemHandler>();
		final TunnelCollection<PartP2PItems> itemTunnels;

		try
		{
			itemTunnels = this.getOutputs();
		}
		catch( final GridAccessException e )
		{
			return EmptyHandler.INSTANCE;
		}

		for( final PartP2PItems t : itemTunnels )
		{
			final IItemHandler inv = t.getOutputInv();
			if( inv != null && inv != this )
			{
				if( Platform.getRandomInt() % 2 == 0 )
				{
					outs.add( inv );
				}
				else
				{
					outs.add( 0, inv );
				}
			}
		}

		return this.cachedInv = new WrapperChainedItemHandler( outs.toArray( new IItemHandler[outs.size()] ) );
	}

	private IItemHandler getOutputInv()
	{
		IItemHandler ret = null;
		if( !this.partVisited )
		{
			this.partVisited = true;
			if( this.getProxy().isActive() )
			{
				final EnumFacing facing = this.getSide().getFacing();
				final TileEntity te = this.getTile().getWorld().getTileEntity( this.getTile().getPos().offset( facing ) );

				if( te != null && te.hasCapability( CapabilityItemHandler.ITEM_HANDLER_CAPABILITY, facing.getOpposite() ) )
				{
					ret = te.getCapability( CapabilityItemHandler.ITEM_HANDLER_CAPABILITY, facing.getOpposite() );
				}
			}
			this.partVisited = false;
		}
		return ret;
	}

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

	@Override
	public TickRateModulation tickingRequest( final IGridNode node, final int ticksSinceLastCall )
	{
		final boolean wasReq = this.requested;

		if( this.requested && this.cachedInv != null )
		{
			( (WrapperChainedItemHandler) this.cachedInv ).cycleOrder();
		}

		this.requested = false;
		return wasReq ? TickRateModulation.FASTER : TickRateModulation.SLOWER;
	}

	@Override
	public void onTunnelNetworkChange()
	{
		if( !this.isOutput() )
		{
			this.cachedInv = null;
			final int olderSize = this.oldSize;
			this.oldSize = this.getDestination().getSlots();
			if( olderSize != this.oldSize )
			{
				this.getHost().notifyNeighbors();
			}
		}
		else
		{
			try
			{
				for( PartP2PItems input : this.getInputs() )
				{
					if( input != null )
					{
						input.getHost().notifyNeighbors();
					}
				}
			}
			catch( GridAccessException e )
			{
				e.printStackTrace();
			}
		}
	}

	@Override
	public boolean hasCapability( Capability<?> capabilityClass )
	{
		if( capabilityClass == CapabilityItemHandler.ITEM_HANDLER_CAPABILITY )
		{
			return true;
		}

		return super.hasCapability( capabilityClass );
	}

	@SuppressWarnings( "unchecked" )
	@Override
	public <T> T getCapability( Capability<T> capabilityClass )
	{
		if( capabilityClass == CapabilityItemHandler.ITEM_HANDLER_CAPABILITY )
		{
			return (T) this;
		}

		return super.getCapability( capabilityClass );
	}

	@Override
	public int getSlots()
	{
		return this.getDestination().getSlots();
	}

	@Override
	public ItemStack getStackInSlot( final int i )
	{
		return this.getDestination().getStackInSlot( i );
	}

	@Override
	public ItemStack insertItem( final int slot, final ItemStack stack, boolean simulate )
	{
		return this.getDestination().insertItem( slot, stack, simulate );
	}

	@Override
	public ItemStack extractItem( final int slot, final int amount, boolean simulate )
	{
		return this.getDestination().extractItem( slot, amount, simulate );
	}

	@Override
	public int getSlotLimit( int slot )
	{
		return this.getDestination().getSlotLimit( slot );
	}

	public float getPowerDrainPerTick()
	{
		return POWER_DRAIN;
	}

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