/*
 * 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.me.storage;

import java.util.HashSet;

import net.minecraft.inventory.IInventory;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTBase;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraftforge.oredict.OreDictionary;

import appeng.api.AEApi;
import appeng.api.config.Actionable;
import appeng.api.config.FuzzyMode;
import appeng.api.exceptions.AppEngException;
import appeng.api.implementations.items.IStorageCell;
import appeng.api.networking.security.BaseActionSource;
import appeng.api.storage.ICellInventory;
import appeng.api.storage.IMEInventory;
import appeng.api.storage.IMEInventoryHandler;
import appeng.api.storage.ISaveProvider;
import appeng.api.storage.StorageChannel;
import appeng.api.storage.data.IAEItemStack;
import appeng.api.storage.data.IItemList;
import appeng.util.Platform;
import appeng.util.item.AEItemStack;

public class CellInventory implements ICellInventory
{

	static final String ITEM_TYPE_TAG = "it";
	static final String ITEM_COUNT_TAG = "ic";
	static final String ITEM_SLOT = "#";
	static final String ITEM_SLOT_COUNT = "@";
	static final String ITEM_PRE_FORMATTED_COUNT = "PF";
	static final String ITEM_PRE_FORMATTED_SLOT = "PF#";
	static final String ITEM_PRE_FORMATTED_NAME = "PN";
	static final String ITEM_PRE_FORMATTED_FUZZY = "FP";

	static protected String[] ITEM_SLOT_ARR;
	static protected String[] ITEM_SLOT_COUNT_ARR;

	final protected NBTTagCompound tagCompound;
	protected int MAX_ITEM_TYPES = 63;
	protected short storedItems = 0;
	protected int storedItemCount = 0;
	protected IItemList<IAEItemStack> cellItems;

	protected ItemStack i;
	protected IStorageCell CellType;

	final protected ISaveProvider container;

	protected CellInventory(NBTTagCompound data, ISaveProvider container) {
		this.tagCompound = data;
		this.container = container;
	}

	protected void loadCellItems()
	{
		if ( this.cellItems == null )
			this.cellItems = AEApi.instance().storage().createItemList();

		this.cellItems.resetStatus(); // clears totals and stuff.

		int types = (int) this.getStoredItemTypes();

		for (int x = 0; x < types; x++)
		{
			ItemStack t = ItemStack.loadItemStackFromNBT( this.tagCompound.getCompoundTag( ITEM_SLOT_ARR[x] ) );
			if ( t != null )
			{
				t.stackSize = this.tagCompound.getInteger( ITEM_SLOT_COUNT_ARR[x] );

				if ( t.stackSize > 0 )
				{
					this.cellItems.add( AEItemStack.create( t ) );
				}
			}
		}

		// cellItems.clean();
	}

	void saveChanges()
	{
		// cellItems.clean();
		int itemCount = 0;

		// add new pretty stuff...
		int x = 0;
		for (IAEItemStack v : this.cellItems)
		{
			itemCount += v.getStackSize();

			NBTBase c = this.tagCompound.getTag( ITEM_SLOT_ARR[x] );
			if ( c instanceof NBTTagCompound )
			{
				v.writeToNBT( (NBTTagCompound) c );
			}
			else
			{
				NBTTagCompound g = new NBTTagCompound();
				v.writeToNBT( g );
				this.tagCompound.setTag( ITEM_SLOT_ARR[x], g );
			}

			/*
			 * NBTBase tagSlotCount = tagCompound.getTag( ITEM_SLOT_COUNT_ARR[x] ); if ( tagSlotCount instanceof
			 * NBTTagInt ) ((NBTTagInt) tagSlotCount).data = (int) v.getStackSize(); else
			 */
			this.tagCompound.setInteger( ITEM_SLOT_COUNT_ARR[x], (int) v.getStackSize() );

			x++;
		}

		// NBTBase tagType = tagCompound.getTag( ITEM_TYPE_TAG );
		// NBTBase tagCount = tagCompound.getTag( ITEM_COUNT_TAG );
		short oldStoredItems = this.storedItems;

		/*
		 * if ( tagType instanceof NBTTagShort ) ((NBTTagShort) tagType).data = storedItems = (short) cellItems.size();
		 * else
		 */
		if ( this.cellItems.isEmpty() )
		{
			this.tagCompound.removeTag( ITEM_TYPE_TAG );
		}
		else
		{
			this.storedItems = ( short ) this.cellItems.size();
			this.tagCompound.setShort( ITEM_TYPE_TAG, this.storedItems );
		}

		/*
		 * if ( tagCount instanceof NBTTagInt ) ((NBTTagInt) tagCount).data = storedItemCount = itemCount; else
		 */
		if ( itemCount == 0 )
		{
			this.tagCompound.removeTag( ITEM_COUNT_TAG );
		}
		else
		{
			this.storedItemCount = itemCount;
			this.tagCompound.setInteger( ITEM_COUNT_TAG, itemCount );
		}

		// clean any old crusty stuff...
		for (; x < oldStoredItems && x < this.MAX_ITEM_TYPES; x++)
		{
			this.tagCompound.removeTag( ITEM_SLOT_ARR[x] );
			this.tagCompound.removeTag( ITEM_SLOT_COUNT_ARR[x] );
		}

		if ( this.container != null )
			this.container.saveChanges( this );
	}

	protected CellInventory(ItemStack o, ISaveProvider container) throws AppEngException {
		if ( ITEM_SLOT_ARR == null )
		{
			ITEM_SLOT_ARR = new String[this.MAX_ITEM_TYPES];
			ITEM_SLOT_COUNT_ARR = new String[this.MAX_ITEM_TYPES];

			for (int x = 0; x < this.MAX_ITEM_TYPES; x++)
			{
				ITEM_SLOT_ARR[x] = ITEM_SLOT + x;
				ITEM_SLOT_COUNT_ARR[x] = ITEM_SLOT_COUNT + x;
			}
		}

		if ( o == null )
		{
			throw new AppEngException( "ItemStack was used as a cell, but was not a cell!" );
		}

		this.CellType = null;
		this.i = o;

		Item type = this.i.getItem();
		if ( type instanceof IStorageCell )
		{
			this.CellType = (IStorageCell) this.i.getItem();
			this.MAX_ITEM_TYPES = this.CellType.getTotalTypes( this.i );
		}

		if ( this.CellType == null )
		{
			throw new AppEngException( "ItemStack was used as a cell, but was not a cell!" );
		}

		if ( !this.CellType.isStorageCell( this.i ) )
		{
			throw new AppEngException( "ItemStack was used as a cell, but was not a cell!" );
		}

		if ( this.MAX_ITEM_TYPES > 63 )
			this.MAX_ITEM_TYPES = 63;
		if ( this.MAX_ITEM_TYPES < 1 )
			this.MAX_ITEM_TYPES = 1;

		this.container = container;
		this.tagCompound = Platform.openNbtData( o );
		this.storedItems = this.tagCompound.getShort( ITEM_TYPE_TAG );
		this.storedItemCount = this.tagCompound.getInteger( ITEM_COUNT_TAG );
		this.cellItems = null;
	}

	IItemList<IAEItemStack> getCellItems()
	{
		if ( this.cellItems == null )
		{
			this.cellItems = AEApi.instance().storage().createItemList();
			this.loadCellItems();
		}

		return this.cellItems;
	}

	@Override
	public int getBytesPerType()
	{
		return this.CellType.BytePerType( this.i );
	}

	@Override
	public boolean canHoldNewItem()
	{
		long bytesFree = this.getFreeBytes();
		return (bytesFree > this.getBytesPerType() || (bytesFree == this.getBytesPerType() && this.getUnusedItemCount() > 0)) && this.getRemainingItemTypes() > 0;
	}

	public static IMEInventoryHandler getCell(ItemStack o, ISaveProvider container2)
	{
		try
		{
			return new CellInventoryHandler( new CellInventory( o, container2 ) );
		}
		catch (AppEngException e)
		{
			return null;
		}
	}

	private static boolean isStorageCell(ItemStack i)
	{
		if ( i == null )
		{
			return false;
		}

		try
		{
			Item type = i.getItem();
			if ( type instanceof IStorageCell )
			{
				return !((IStorageCell) type).storableInStorageCell();
			}
		}
		catch (Throwable err)
		{
			return true;
		}

		return false;
	}

	public static boolean isCell(ItemStack i)
	{
		if ( i == null )
		{
			return false;
		}

		Item type = i.getItem();
		if ( type instanceof IStorageCell )
		{
			return ((IStorageCell) type).isStorageCell( i );
		}

		return false;
	}

	@Override
	public long getTotalBytes()
	{
		return this.CellType.getBytes( this.i );
	}

	@Override
	public long getFreeBytes()
	{
		return this.getTotalBytes() - this.getUsedBytes();
	}

	@Override
	public long getUsedBytes()
	{
		long bytesForItemCount = (this.getStoredItemCount() + this.getUnusedItemCount()) / 8;
		return this.getStoredItemTypes() * this.getBytesPerType() + bytesForItemCount;
	}

	@Override
	public long getTotalItemTypes()
	{
		return this.MAX_ITEM_TYPES;
	}

	@Override
	public long getStoredItemTypes()
	{
		return this.storedItems;
	}

	@Override
	public long getStoredItemCount()
	{
		return this.storedItemCount;
	}

	private void updateItemCount(long delta)
	{
		this.tagCompound.setInteger( ITEM_COUNT_TAG, this.storedItemCount = (int) (this.storedItemCount + delta) );
	}

	@Override
	public long getRemainingItemTypes()
	{
		long basedOnStorage = this.getFreeBytes() / this.getBytesPerType();
		long baseOnTotal = this.getTotalItemTypes() - this.getStoredItemTypes();
		return basedOnStorage > baseOnTotal ? baseOnTotal : basedOnStorage;
	}

	@Override
	public long getRemainingItemCount()
	{
		long remaining = this.getFreeBytes() * 8 + this.getUnusedItemCount();
		return remaining > 0 ? remaining : 0;
	}

	@Override
	public int getUnusedItemCount()
	{
		int div = (int) (this.getStoredItemCount() % 8);

		if ( div == 0 )
		{
			return 0;
		}

		return 8 - div;
	}

	private static final HashSet<Integer> BLACK_LIST = new HashSet<Integer>();

	public static void addBasicBlackList(int itemID, int Meta)
	{
		BLACK_LIST.add( ( Meta << Platform.DEF_OFFSET ) | itemID );
	}

	public static boolean isBlackListed(IAEItemStack input)
	{
		if ( BLACK_LIST.contains( (OreDictionary.WILDCARD_VALUE << Platform.DEF_OFFSET) | Item.getIdFromItem( input.getItem() ) ) )
			return true;
		return BLACK_LIST.contains( (input.getItemDamage() << Platform.DEF_OFFSET) | Item.getIdFromItem( input.getItem() ) );
	}

	private boolean isEmpty(IMEInventory meInventory)
	{
		return meInventory.getAvailableItems( AEApi.instance().storage().createItemList() ).isEmpty();
	}

	@Override
	public IAEItemStack injectItems(IAEItemStack input, Actionable mode, BaseActionSource src)
	{
		if ( input == null )
			return null;
		if ( input.getStackSize() == 0 )
			return null;

		if ( isBlackListed( input ) || this.CellType.isBlackListed( this.i, input ) )
			return input;

		ItemStack sharedItemStack = input.getItemStack();

		if ( CellInventory.isStorageCell( sharedItemStack ) )
		{
			IMEInventory meInventory = getCell( sharedItemStack, null );
			if ( meInventory != null && !this.isEmpty( meInventory ) )
				return input;
		}

		IAEItemStack l = this.getCellItems().findPrecise( input );
		if ( l != null )
		{
			long remainingItemSlots = this.getRemainingItemCount();
			if ( remainingItemSlots < 0 )
				return input;

			if ( input.getStackSize() > remainingItemSlots )
			{
				IAEItemStack r = input.copy();
				r.setStackSize( r.getStackSize() - remainingItemSlots );
				if ( mode == Actionable.MODULATE )
				{
					l.setStackSize( l.getStackSize() + remainingItemSlots );
					this.updateItemCount( remainingItemSlots );
					this.saveChanges();
				}
				return r;
			}
			else
			{
				if ( mode == Actionable.MODULATE )
				{
					l.setStackSize( l.getStackSize() + input.getStackSize() );
					this.updateItemCount( input.getStackSize() );
					this.saveChanges();
				}
				return null;
			}
		}

		if ( this.canHoldNewItem() ) // room for new type, and for at least one item!
		{
			int remainingItemCount = (int) this.getRemainingItemCount() - this.getBytesPerType() * 8;
			if ( remainingItemCount > 0 )
			{
				if ( input.getStackSize() > remainingItemCount )
				{
					ItemStack toReturn = Platform.cloneItemStack( sharedItemStack );
					toReturn.stackSize = sharedItemStack.stackSize - remainingItemCount;
					if ( mode == Actionable.MODULATE )
					{
						ItemStack toWrite = Platform.cloneItemStack( sharedItemStack );
						toWrite.stackSize = remainingItemCount;

						this.cellItems.add( AEItemStack.create( toWrite ) );
						this.updateItemCount( toWrite.stackSize );

						this.saveChanges();
					}
					return AEItemStack.create( toReturn );
				}

				if ( mode == Actionable.MODULATE )
				{
					this.updateItemCount( input.getStackSize() );
					this.cellItems.add( input );
					this.saveChanges();
				}

				return null;
			}
		}

		return input;
	}

	@Override
	public IAEItemStack extractItems(IAEItemStack request, Actionable mode, BaseActionSource src)
	{
		if ( request == null )
			return null;

		ItemStack sharedItem = request.getItemStack();
		int size = sharedItem.stackSize;

		IAEItemStack Results = null;

		IAEItemStack l = this.getCellItems().findPrecise( request );
		if ( l != null )
		{
			Results = l.copy();

			if ( l.getStackSize() <= size )
			{
				Results.setStackSize( l.getStackSize() );
				if ( mode == Actionable.MODULATE )
				{
					this.updateItemCount( -l.getStackSize() );
					l.setStackSize( 0 );
					this.saveChanges();
				}
			}
			else
			{
				Results.setStackSize( size );
				if ( mode == Actionable.MODULATE )
				{
					l.setStackSize( l.getStackSize() - size );
					this.updateItemCount( -size );
					this.saveChanges();
				}
			}
		}

		return Results;
	}

	@Override
	public IItemList getAvailableItems(IItemList out)
	{
		for (IAEItemStack i : this.getCellItems())
			out.add( i );

		return out;
	}

	@Override
	public StorageChannel getChannel()
	{
		return StorageChannel.ITEMS;
	}

	@Override
	public double getIdleDrain()
	{
		return this.CellType.getIdleDrain();
	}

	@Override
	public FuzzyMode getFuzzyMode()
	{
		return this.CellType.getFuzzyMode( this.i );
	}

	@Override
	public IInventory getConfigInventory()
	{
		return this.CellType.getConfigInventory( this.i );
	}

	@Override
	public IInventory getUpgradesInventory()
	{
		return this.CellType.getUpgradesInventory( this.i );
	}

	@Override
	public int getStatusForCell()
	{
		if ( this.canHoldNewItem() )
			return 1;
		if ( this.getRemainingItemCount() > 0 )
			return 2;
		return 3;
	}

	@Override
	public ItemStack getItemStack()
	{
		return this.i;
	}

}