/*
 * 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.tile.inventory;


import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;

import javax.annotation.Nonnull;

import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraftforge.items.ItemStackHandler;

import appeng.util.Platform;
import appeng.util.inv.IAEAppEngInventory;
import appeng.util.inv.IInternalItemHandler;
import appeng.util.inv.InvOperation;
import appeng.util.inv.filter.IAEItemFilter;


public class AppEngInternalInventory extends ItemStackHandler implements IInternalItemHandler, Iterable<ItemStack>
{
	private boolean enableClientEvents = false;
	private IAEAppEngInventory te;
	private final int[] maxStack;
	private InvOperation currentOp;
	private ItemStack previousStack = ItemStack.EMPTY;
	private IAEItemFilter filter;

	public AppEngInternalInventory( final IAEAppEngInventory inventory, final int size, final int maxStack, IAEItemFilter filter )
	{
		super( size );
		this.setTileEntity( inventory );
		this.setFilter( filter );
		this.maxStack = new int[size];
		Arrays.fill( this.maxStack, maxStack );
	}

	public AppEngInternalInventory( final IAEAppEngInventory inventory, final int size, final int maxStack )
	{
		this( inventory, size, maxStack, null );
	}

	public AppEngInternalInventory( final IAEAppEngInventory inventory, final int size )
	{
		this( inventory, size, 64 );
	}

	public void setFilter( IAEItemFilter filter )
	{
		this.filter = filter;
	}

	@Override
	public int getSlotLimit( int slot )
	{
		return this.maxStack[slot];
	}

	@Override
	public void setStackInSlot( int slot, @Nonnull ItemStack stack )
	{
		this.currentOp = InvOperation.SET;
		this.previousStack = this.getStackInSlot( slot );
		super.setStackInSlot( slot, stack );
	}

	@Override
	@Nonnull
	public ItemStack insertItem( int slot, @Nonnull ItemStack stack, boolean simulate )
	{
		if( this.filter != null && !this.filter.allowInsert( this, slot, stack ) )
		{
			return stack;
		}

		this.currentOp = InvOperation.INSERT;
		this.previousStack = this.getStackInSlot( slot ).copy();
		return super.insertItem( slot, stack, simulate );
	}

	@Override
	@Nonnull
	public ItemStack extractItem( int slot, int amount, boolean simulate )
	{
		if( this.filter != null && !this.filter.allowExtract( this, slot, amount ) )
		{
			return ItemStack.EMPTY;
		}

		this.currentOp = InvOperation.EXTRACT;
		this.previousStack = this.getStackInSlot( slot );
		return super.extractItem( slot, amount, simulate );
	}

	@Override
	protected void onContentsChanged( int slot )
	{
		if( this.getTileEntity() != null && this.eventsEnabled() )
		{
			ItemStack added = this.getStackInSlot( slot ).copy();
			ItemStack removed = this.previousStack.copy();

			if( this.currentOp == InvOperation.INSERT )
			{
				added.grow( -removed.getCount() );
			}
			else if( this.currentOp == InvOperation.EXTRACT )
			{
				removed.grow( -added.getCount() );
			}
			this.getTileEntity().onChangeInventory( this, slot, this.currentOp, removed, added );
			this.getTileEntity().saveChanges();
		}
		super.onContentsChanged( slot );
	}

	protected boolean eventsEnabled()
	{
		return Platform.isServer() || this.isEnableClientEvents();
	}

	public void setMaxStackSize( final int slot, final int size )
	{
		this.maxStack[slot] = size;
	}

	@Override
	public void markDirty( final int slot )
	{
		if( this.getTileEntity() != null && this.eventsEnabled() )
		{
			this.getTileEntity().onChangeInventory( this, slot, InvOperation.DIRTY, ItemStack.EMPTY, ItemStack.EMPTY );
			this.getTileEntity().saveChanges();
		}
	}

	@Override
	public boolean isItemValidForSlot( int slot, ItemStack stack )
	{
		if( this.maxStack[slot] == 0 )
		{
			return false;
		}
		if( this.filter != null )
		{
			return this.filter.allowInsert( this, slot, stack );
		}
		return true;
	}

	public void writeToNBT( final NBTTagCompound data, final String name )
	{
		data.setTag( name, this.serializeNBT() );
	}

	public void readFromNBT( final NBTTagCompound data, final String name )
	{
		final NBTTagCompound c = data.getCompoundTag( name );
		if( c != null )
		{
			this.readFromNBT( c );
		}
	}

	public void readFromNBT( final NBTTagCompound data )
	{
		this.deserializeNBT( data );
	}

	@Override
	public Iterator<ItemStack> iterator()
	{
		return Collections.unmodifiableList( super.stacks ).iterator();
	}

	private boolean isEnableClientEvents()
	{
		return this.enableClientEvents;
	}

	public void setEnableClientEvents( final boolean enableClientEvents )
	{
		this.enableClientEvents = enableClientEvents;
	}

	private IAEAppEngInventory getTileEntity()
	{
		return this.te;
	}

	public void setTileEntity( final IAEAppEngInventory te )
	{
		this.te = te;
	}
}