BagInventory.java

package mod.chiselsandbits.bitbag;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.TreeMap;

import javax.annotation.Nonnull;

import mod.chiselsandbits.core.ChiselsAndBits;
import mod.chiselsandbits.helpers.LocalStrings;
import mod.chiselsandbits.helpers.ModUtil;
import mod.chiselsandbits.items.ItemBitBag;
import mod.chiselsandbits.items.ItemChiseledBit;
import net.minecraft.block.state.IBlockState;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.inventory.IInventory;
import net.minecraft.item.ItemStack;
import net.minecraft.util.text.ITextComponent;
import net.minecraft.util.text.TextComponentString;
import net.minecraft.util.text.TextComponentTranslation;
import net.minecraftforge.fml.relauncher.Side;
import net.minecraftforge.fml.relauncher.SideOnly;
import net.minecraftforge.items.CapabilityItemHandler;

public class BagInventory implements IInventory
{

	// internal storage, the capability.
	BagStorage inv;

	// tmp storage, the IInventory
	ItemStack[] stackSlots;

	public BagInventory(
			final ItemStack is )
	{
		inv = (BagStorage) is.getCapability( CapabilityItemHandler.ITEM_HANDLER_CAPABILITY, null );
		stackSlots = new ItemStack[BagStorage.BAG_STORAGE_SLOTS];

		// the cap is missing? then just make and load it ourselves.
		if ( inv == null )
		{
			inv = new BagStorage();
			inv.stack = is;
			inv.setStorage( BagCapabilityProvider.getStorageArray( is, BagStorage.BAG_STORAGE_SLOTS * ItemBitBag.INTS_PER_BIT_TYPE ) );
		}

		for ( int x = 0; x < stackSlots.length; ++x )
		{
			stackSlots[x] = ModUtil.getEmptyStack();
		}
	}

	public ItemStack getItemStack()
	{
		return inv.stack;
	}

	@Override
	public String getName()
	{
		return "container.inventory";
	}

	@Override
	public boolean hasCustomName()
	{
		return false;
	}

	@Override
	public ITextComponent getDisplayName()
	{
		return hasCustomName() ? new TextComponentString( getName() ) : new TextComponentTranslation( getName(), new Object[0] );
	}

	@Override
	public int getSizeInventory()
	{
		return stackSlots.length;
	}

	private int getStateInSlot(
			int index )
	{
		final int qty = inv.contents[ItemBitBag.INTS_PER_BIT_TYPE * index + ItemBitBag.OFFSET_QUANTITY];
		final int id = inv.contents[ItemBitBag.INTS_PER_BIT_TYPE * index + ItemBitBag.OFFSET_STATE_ID];

		if ( qty > 0 )
		{
			return id;
		}

		return 0;
	}

	@Override
	public @Nonnull ItemStack getStackInSlot(
			final int index )
	{
		final int qty = inv.contents[ItemBitBag.INTS_PER_BIT_TYPE * index + ItemBitBag.OFFSET_QUANTITY];
		final int id = inv.contents[ItemBitBag.INTS_PER_BIT_TYPE * index + ItemBitBag.OFFSET_STATE_ID];

		if ( ModUtil.notEmpty( stackSlots[index] ) )
		{
			final ItemStack which = ModUtil.nonNull( stackSlots[index] );
			ModUtil.setStackSize( which, qty );
			return which;
		}

		if ( qty == 0 || id == 0 )
		{
			return ModUtil.getEmptyStack();
		}

		return stackSlots[index] = ItemChiseledBit.createStack( id, qty, false );
	}

	@Override
	public ItemStack decrStackSize(
			final int index,
			int count )
	{
		final int qty = inv.contents[ItemBitBag.INTS_PER_BIT_TYPE * index + ItemBitBag.OFFSET_QUANTITY];
		final int id = inv.contents[ItemBitBag.INTS_PER_BIT_TYPE * index + ItemBitBag.OFFSET_STATE_ID];

		if ( qty == 0 || id == 0 )
		{
			return ModUtil.getEmptyStack();
		}

		if ( count > qty )
		{
			count = qty;
		}

		inv.contents[ItemBitBag.INTS_PER_BIT_TYPE * index + ItemBitBag.OFFSET_QUANTITY] -= count;
		inv.onChange();

		if ( ModUtil.notEmpty( stackSlots[index] ) )
		{
			ModUtil.adjustStackSize( ModUtil.nonNull( stackSlots[index] ), -count );
		}

		return ItemChiseledBit.createStack( id, count, false );
	}

	@Override
	public ItemStack removeStackFromSlot(
			final int index )
	{
		return ModUtil.getEmptyStack();
	}

	@Override
	public void setInventorySlotContents(
			final int index,
			final ItemStack stack )
	{
		stackSlots[index] = ModUtil.getEmptyStack();

		if ( stack != null && stack.getItem() instanceof ItemChiseledBit )
		{
			inv.contents[ItemBitBag.INTS_PER_BIT_TYPE * index + ItemBitBag.OFFSET_QUANTITY] = ModUtil.getStackSize( stack );
			inv.contents[ItemBitBag.INTS_PER_BIT_TYPE * index + ItemBitBag.OFFSET_STATE_ID] = ItemChiseledBit.getStackState( stack );
		}
		else
		{
			inv.contents[ItemBitBag.INTS_PER_BIT_TYPE * index + ItemBitBag.OFFSET_QUANTITY] = 0;
			inv.contents[ItemBitBag.INTS_PER_BIT_TYPE * index + ItemBitBag.OFFSET_STATE_ID] = 0;
		}

		inv.onChange();
	}

	@Override
	public int getInventoryStackLimit()
	{
		return ChiselsAndBits.getConfig().bagStackSize;
	}

	@Override
	public void markDirty()
	{
		for ( int x = 0; x < getSizeInventory(); x++ )
		{
			if ( ModUtil.notEmpty( stackSlots[x] ) )
			{
				inv.contents[ItemBitBag.INTS_PER_BIT_TYPE * x + ItemBitBag.OFFSET_QUANTITY] = ModUtil.getStackSize( stackSlots[x] );
				stackSlots[x] = ModUtil.getEmptyStack();
				inv.onChange();
			}
		}
	}

	@Override
	public boolean isUseableByPlayer(
			final EntityPlayer player )
	{
		return true;
	}

	@Override
	public void openInventory(
			final EntityPlayer player )
	{
	}

	@Override
	public void closeInventory(
			final EntityPlayer player )
	{
	}

	@Override
	public boolean isItemValidForSlot(
			final int index,
			final ItemStack stack )
	{
		return stack != null && stack.getItem() instanceof ItemChiseledBit;
	}

	@Override
	public int getField(
			final int id )
	{
		return 0;
	}

	@Override
	public void setField(
			final int id,
			final int value )
	{

	}

	@Override
	public int getFieldCount()
	{
		return 0;
	}

	public void clear(
			final ItemStack stack )
	{
		for ( int x = 0; x < stackSlots.length; ++x )
		{
			if ( matches( stack, stackSlots[x] ) )
			{
				stackSlots[x] = ModUtil.getEmptyStack();
				inv.contents[x * ItemBitBag.INTS_PER_BIT_TYPE + ItemBitBag.OFFSET_STATE_ID] = 0;
				inv.contents[x * ItemBitBag.INTS_PER_BIT_TYPE + ItemBitBag.OFFSET_QUANTITY] = 0;
			}
		}

		inv.onChange();
	}

	public boolean matches(
			final ItemStack cmpStack,
			final ItemStack invStack )
	{
		if ( ModUtil.isEmpty( cmpStack ) || invStack == null )
		{
			return true;
		}

		return cmpStack.getItem() == invStack.getItem() && ItemStack.areItemStackTagsEqual( cmpStack, invStack );
	}

	public ItemStack restockItem(
			final ItemStack target,
			final ItemStack targetType )
	{
		int outSize = ModUtil.getStackSize( target );

		for ( int x = getSizeInventory() - 1; x >= 0; x-- )
		{
			if ( ItemChiseledBit.sameBit( targetType, getStateInSlot( x ) ) )
			{
				final ItemStack is = getStackInSlot( x );

				outSize += ModUtil.getStackSize( is );
				final int total = outSize;
				outSize = Math.min( is.getMaxStackSize(), outSize );
				final int overage = total - outSize;

				if ( overage > 0 )
				{
					ModUtil.setStackSize( is, overage );
				}
				else
				{
					setInventorySlotContents( x, ModUtil.getEmptyStack() );
				}

				markDirty();

				if ( outSize == is.getMaxStackSize() )
				{
					// done!
					break;
				}
			}
		}

		final ItemStack out = ModUtil.copy( targetType );
		ModUtil.setStackSize( out, outSize );
		return out;
	}

	public @Nonnull ItemStack insertItem(
			final @Nonnull ItemStack which )
	{
		for ( int x = 0; x < getSizeInventory(); x++ )
		{
			final ItemStack is = getStackInSlot( x );
			if ( !ModUtil.isEmpty( is ) && ItemChiseledBit.getStackState( which ) == ItemChiseledBit.getStackState( is ) )
			{
				ModUtil.adjustStackSize( is, ModUtil.getStackSize( which ) );
				final int total = ModUtil.getStackSize( is );
				ModUtil.setStackSize( is, Math.min( getInventoryStackLimit(), ModUtil.getStackSize( is ) ) );
				final int overage = total - ModUtil.getStackSize( is );
				if ( overage > 0 )
				{
					ModUtil.setStackSize( which, overage );
					markDirty();
				}
				else
				{
					markDirty();
					return ModUtil.getEmptyStack();
				}
			}
			else if ( ModUtil.isEmpty( is ) )
			{
				setInventorySlotContents( x, which );
				markDirty();
				return ModUtil.getEmptyStack();
			}
		}

		return which;
	}

	public int extractBit(
			final int bitMeta,
			int total )
	{
		int used = 0;

		for ( int index = stackSlots.length - 1; index >= 0; index-- )
		{
			final int qty_idx = ItemBitBag.INTS_PER_BIT_TYPE * index + ItemBitBag.OFFSET_QUANTITY;

			final int qty = inv.contents[qty_idx];
			final int id = inv.contents[ItemBitBag.INTS_PER_BIT_TYPE * index + ItemBitBag.OFFSET_STATE_ID];

			if ( id == bitMeta && qty > 0 )
			{
				inv.contents[qty_idx] -= total;

				if ( inv.contents[qty_idx] < 0 )
				{
					inv.contents[qty_idx] = 0;
				}

				inv.onChange();

				final int diff = qty - inv.contents[qty_idx];
				used += diff;
				total -= diff;

				if ( 0 == total )
				{
					return used;
				}
			}
		}

		return used;
	}

	@SideOnly( Side.CLIENT )
	public List<String> listContents(
			final List<String> details )
	{
		final TreeMap<String, Integer> contents = new TreeMap<String, Integer>();

		for ( int x = 0; x < getSizeInventory(); x++ )
		{
			final ItemStack is = getStackInSlot( x );
			if ( !ModUtil.isEmpty( is ) )
			{
				final IBlockState state = ModUtil.getStateById( ItemChiseledBit.getStackState( is ) );
				if ( state == null )
				{
					continue;
				}

				final String name = ItemChiseledBit.getBitStateName( state );

				if ( name != null )
				{
					Integer count = contents.get( name );
					if ( count == null )
					{
						count = ModUtil.getStackSize( is );
					}
					else
					{
						count += ModUtil.getStackSize( is );
					}

					contents.put( name, count );
				}
			}
		}

		if ( contents.isEmpty() )
		{
			details.add( LocalStrings.Empty.getLocal() );
		}

		final List<Entry<String, Integer>> list = new ArrayList<Map.Entry<String, Integer>>();
		list.addAll( contents.entrySet() );

		Collections.sort( list, new Comparator<Entry<String, Integer>>() {

			@Override
			public int compare(
					final Entry<String, Integer> o1,
					final Entry<String, Integer> o2 )
			{
				final int y = o1.getValue();
				final int x = o2.getValue();

				return x < y ? -1 : x == y ? 0 : 1;
			}

		} );

		for ( final Entry<String, Integer> e : list )
		{
			details.add( new StringBuilder().append( e.getValue() ).append( ' ' ).append( e.getKey() ).toString() );
		}

		return details;
	}

	@Override
	public void clear()
	{
		clear( null );
	}

	@Override
	public boolean func_191420_l()
	{
		for ( final ItemStack itemstack : stackSlots )
		{
			if ( !itemstack.func_190926_b() )
			{
				return false;
			}
		}

		return true;
	}
}