ironbarrels/src/main/java/cpw/mods/ironchest/ItemChestChanger.java

/*******************************************************************************
 * Copyright (c) 2012 cpw.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Public License v3.0
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/gpl.html
 *
 * Contributors:
 *     cpw - initial API and implementation
 ******************************************************************************/
package cpw.mods.ironchest;

import net.minecraft.creativetab.CreativeTabs;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.init.Blocks;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.tileentity.TileEntityChest;
import net.minecraft.util.BlockPos;
import net.minecraft.util.EnumFacing;
import net.minecraft.world.World;
import net.minecraftforge.fml.common.ObfuscationReflectionHelper;

public class ItemChestChanger extends Item 
{
    private ChestChangerType type;

    public ItemChestChanger(ChestChangerType type)
    {
        this.type = type;
        
        this.setMaxStackSize(1);
        this.setUnlocalizedName("ironchest:" + type.name());
        this.setCreativeTab(CreativeTabs.tabMisc);
    }

    @Override
    public boolean onItemUseFirst(ItemStack stack, EntityPlayer player, World world, BlockPos pos, EnumFacing side, float hitX, float hitY, float hitZ)
    {
        if (world.isRemote) return false;
        TileEntity te = world.getTileEntity(pos);
        TileEntityIronChest newchest;
        if (te != null && te instanceof TileEntityIronChest)
        {
            TileEntityIronChest ironchest = (TileEntityIronChest) te;
            newchest = ironchest.applyUpgradeItem(this);
            if (newchest == null)
            {
                return false;
            }
        }
        else if (te != null && te instanceof TileEntityChest)
        {
            TileEntityChest tec = (TileEntityChest) te;
            if (tec.numPlayersUsing > 0)
            {
                return false;
            }
            if (!getType().canUpgrade(IronChestType.WOOD))
            {
                return false;
            }
            // Force old TE out of the world so that adjacent chests can update
            newchest = IronChestType.makeEntity(getTargetChestOrdinal(IronChestType.WOOD.ordinal()));
            int newSize = newchest.chestContents.length;
            ItemStack[] chestContents = ObfuscationReflectionHelper.getPrivateValue(TileEntityChest.class, tec, 0);
            System.arraycopy(chestContents, 0, newchest.chestContents, 0, Math.min(newSize, chestContents.length));
            BlockIronChest block = IronChest.ironChestBlock;
            block.dropContent(newSize, tec, world, tec.getPos());
            newchest.setFacing((byte) tec.getBlockMetadata());
            newchest.sortTopStacks();
            for (int i = 0; i < Math.min(newSize, chestContents.length); i++)
            {
                chestContents[i] = null;
            }
            // Clear the old block out
            world.setBlockState(pos, Blocks.air.getDefaultState(), 3);
            // Force the Chest TE to reset it's knowledge of neighbouring blocks
            tec.updateContainingBlockInfo();
            // Force the Chest TE to update any neighbours so they update next
            // tick
            tec.checkForAdjacentChests();
            // And put in our block instead
            world.setBlockState(pos, block.getStateFromMeta(newchest.getType().ordinal()), 3);
        }
        else
        {
            return false;
        }
        world.setTileEntity(pos, newchest);
        world.setBlockState(pos, IronChest.ironChestBlock.getStateFromMeta(newchest.getType().ordinal()), 3);
        stack.stackSize = 0;
        return true;
    }

    public int getTargetChestOrdinal(int sourceOrdinal)
    {
        return type.getTarget();
    }

    public ChestChangerType getType()
    {
        return type;
    }
}