Chisel/src/main/java/com/cricketcraft/chisel/inventory/ContainerAutoChisel.java

package com.cricketcraft.chisel.inventory;

import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.entity.player.InventoryPlayer;
import net.minecraft.inventory.Container;
import net.minecraft.inventory.IInventory;
import net.minecraft.inventory.Slot;
import net.minecraft.item.ItemStack;

import com.cricketcraft.chisel.block.tileentity.TileEntityAutoChisel;
import com.cricketcraft.chisel.network.PacketHandler;
import com.cricketcraft.chisel.network.message.MessageAutoChisel;

public class ContainerAutoChisel extends Container {

	public TileEntityAutoChisel autoChisel;
	public EntityPlayer player;

	public ContainerAutoChisel(InventoryPlayer player, TileEntityAutoChisel tileEntityAutoChisel) {

		this.player = player.player;
		autoChisel = tileEntityAutoChisel;

		addSlot(tileEntityAutoChisel, 0, 53, 15);
		addSlot(tileEntityAutoChisel, 1, 78, 52);
		addSlot(tileEntityAutoChisel, 2, 103, 15);
		addSlot(tileEntityAutoChisel, 3, 8, 62);
		addSlot(tileEntityAutoChisel, 4, 151, 11);
		addSlot(tileEntityAutoChisel, 5, 151, 31);
		addSlot(tileEntityAutoChisel, 6, 151, 51);

		bindPlayerInventory(player);
	}

	private void addSlot(IInventory inv, final int id, int x, int y) {
		addSlotToContainer(new Slot(inv, id, x, y) {

			@Override
			public boolean isItemValid(ItemStack arg0) {
				return inventory.isItemValidForSlot(id, arg0);
			}
		});
	}

	protected void bindPlayerInventory(InventoryPlayer invPlayer) {
		for (int row = 0; row < 3; row++) {
			for (int column = 0; column < 9; column++) {
				addSlotToContainer(new Slot(invPlayer, column + row * 9 + 9, 8 + column * 18, 84 + row * 18));
			}
		}

		for (int slotNumber = 0; slotNumber < 9; slotNumber++) {
			addSlotToContainer(new Slot(invPlayer, slotNumber, 8 + slotNumber * 18, 142));
		}
	}

	@Override
	public boolean canInteractWith(EntityPlayer player) {
		return autoChisel.isUseableByPlayer(player);
	}

	@Override
	public ItemStack transferStackInSlot(EntityPlayer player, int slotNumber) {
		ItemStack itemStack = null;
		Slot slot = (Slot) this.inventorySlots.get(slotNumber);

		if (slot != null && slot.getHasStack()) {
			ItemStack itemStack1 = slot.getStack();
			itemStack = itemStack1.copy();

			// if we are in the auto chisel
			if (slotNumber <= 6) {
				if (!this.mergeItemStack(itemStack1, 7, 42, false)) {
					return null;
				}
				// otherwise just put it in one of the machine slots
			} else if (!this.mergeItemStack(itemStack1, 0, 7, false)) {
				return null;
			}

			if (itemStack1.stackSize == 0) {
				slot.putStack(null);
			} else {
				slot.onSlotChanged();
			}

			if (itemStack1.stackSize == itemStack.stackSize) {
				return null;
			}

			slot.onPickupFromSlot(player, itemStack1);
		}

		return itemStack;
	}

	@Override
	public ItemStack slotClick(int slotId, int p_75144_2_, int p_75144_3_, EntityPlayer player) {
		if (slotId >= 0 && slotId < this.inventorySlots.size()) {
			Slot slot = (Slot) this.inventorySlots.get(slotId);
			ItemStack stack = slot.getStack();
			ItemStack ret = super.slotClick(slotId, p_75144_2_, p_75144_3_, player);

			if (!player.worldObj.isRemote && slot.slotNumber == TileEntityAutoChisel.BASE && !ItemStack.areItemStacksEqual(stack, slot.getStack())) {
				int chiseled = stack == null ? 0 : slot.getStack() == null ? stack.stackSize : stack.stackSize - slot.getStack().stackSize;
				PacketHandler.INSTANCE.sendToDimension(new MessageAutoChisel(autoChisel, chiseled, false, false), player.worldObj.provider.dimensionId);
			}

			return ret;
		}
		return super.slotClick(slotId, p_75144_2_, p_75144_3_, player);
	}

	/**
	 * Added validation of slot input
	 * 
	 * @author CrazyPants
	 */
	@Override
	protected boolean mergeItemStack(ItemStack par1ItemStack, int fromIndex, int toIndex, boolean reversOrder) {

		boolean result = false;
		int checkIndex = fromIndex;

		if (reversOrder) {
			checkIndex = toIndex - 1;
		}

		Slot slot;
		ItemStack itemstack1;

		if (par1ItemStack.isStackable()) {

			while (par1ItemStack.stackSize > 0 && (!reversOrder && checkIndex < toIndex || reversOrder && checkIndex >= fromIndex)) {
				slot = (Slot) this.inventorySlots.get(checkIndex);
				itemstack1 = slot.getStack();

				if (itemstack1 != null && itemstack1.getItem() == par1ItemStack.getItem() && (!par1ItemStack.getHasSubtypes() || par1ItemStack.getItemDamage() == itemstack1.getItemDamage())
						&& ItemStack.areItemStackTagsEqual(par1ItemStack, itemstack1) && slot.isItemValid(par1ItemStack)) {

					int mergedSize = itemstack1.stackSize + par1ItemStack.stackSize;
					int maxStackSize = Math.min(par1ItemStack.getMaxStackSize(), slot.getSlotStackLimit());
					if (mergedSize <= maxStackSize) {
						par1ItemStack.stackSize = 0;
						itemstack1.stackSize = mergedSize;
						slot.onSlotChanged();
						result = true;
					} else if (itemstack1.stackSize < maxStackSize) {
						par1ItemStack.stackSize -= maxStackSize - itemstack1.stackSize;
						itemstack1.stackSize = maxStackSize;
						slot.onSlotChanged();
						result = true;
					}
				}

				if (reversOrder) {
					--checkIndex;
				} else {
					++checkIndex;
				}
			}
		}

		if (par1ItemStack.stackSize > 0) {
			if (reversOrder) {
				checkIndex = toIndex - 1;
			} else {
				checkIndex = fromIndex;
			}

			while (!reversOrder && checkIndex < toIndex || reversOrder && checkIndex >= fromIndex) {
				slot = (Slot) this.inventorySlots.get(checkIndex);
				itemstack1 = slot.getStack();

				if (itemstack1 == null && slot.isItemValid(par1ItemStack)) {
					ItemStack in = par1ItemStack.copy();
					in.stackSize = Math.min(in.stackSize, slot.getSlotStackLimit());

					slot.putStack(in);
					slot.onSlotChanged();
					if (in.stackSize >= par1ItemStack.stackSize) {
						par1ItemStack.stackSize = 0;
					} else {
						par1ItemStack.stackSize -= in.stackSize;
					}
					result = true;
					break;
				}

				if (reversOrder) {
					--checkIndex;
				} else {
					++checkIndex;
				}
			}
		}

		return result;
	}
}