Hbm-s-Nuclear-Tech-GIT/src/main/java/com/hbm/items/ItemInventory.java

package com.hbm.items;

import com.hbm.util.ItemStackUtil;
import net.minecraft.entity.item.EntityItem;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.inventory.IInventory;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.CompressedStreamTools;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.util.ChatComponentText;
import net.minecraft.util.EnumChatFormatting;

import java.io.IOException;
import java.util.Random;

/**
 * Base class for items containing an inventory. This can be seen in crates, containment boxes, and the toolbox.
 * @author BallOfEnergy/Gammawave
 */
public abstract class ItemInventory implements IInventory {

	public EntityPlayer player;
	public ItemStack[] slots;
	public ItemStack target;

	@Override
	public void markDirty() {

		for(int i = 0; i < getSizeInventory(); ++i) {
			if(getStackInSlot(i) != null && getStackInSlot(i).stackSize == 0) {
				slots[i] = null;
			}
		}

		ItemStackUtil.addStacksToNBT(target, slots); // Maintain compatibility with the containment boxes.
		target.setTagCompound(checkNBT(target.getTagCompound()));

	}

	public NBTTagCompound checkNBT(NBTTagCompound nbt) {
		
		if(nbt == null || nbt.hasNoTags())
			return null;

		Random random = new Random();

		try {
			byte[] abyte = CompressedStreamTools.compress(nbt);

			if (abyte.length > 6000) {
				player.addChatComponentMessage(new ChatComponentText(EnumChatFormatting.RED + "Warning: Container NBT exceeds 6kB, contents will be ejected!"));
				for (int i1 = 0; i1 < this.getSizeInventory(); ++i1) {
					ItemStack itemstack = this.getStackInSlot(i1);

					if (itemstack != null) {
						float f = random.nextFloat() * 0.8F + 0.1F;
						float f1 = random.nextFloat() * 0.8F + 0.1F;
						float f2 = random.nextFloat() * 0.8F + 0.1F;

						while (itemstack.stackSize > 0) {
							int j1 = random.nextInt(21) + 10;

							if (j1 > itemstack.stackSize) {
								j1 = itemstack.stackSize;
							}

							itemstack.stackSize -= j1;
							EntityItem entityitem = new EntityItem(player.worldObj, player.posX + f, player.posY + f1, player.posZ + f2, new ItemStack(itemstack.getItem(), j1, itemstack.getItemDamage()));

							if (itemstack.hasTagCompound()) {
								entityitem.getEntityItem().setTagCompound((NBTTagCompound) itemstack.getTagCompound().copy());
							}

							float f3 = 0.05F;
							entityitem.motionX = (float) random.nextGaussian() * f3 + player.motionX;
							entityitem.motionY = (float) random.nextGaussian() * f3 + 0.2F + player.motionY;
							entityitem.motionZ = (float) random.nextGaussian() * f3 + player.motionZ;
							player.worldObj.spawnEntityInWorld(entityitem);
						}
					}
				}

				return null; // Reset.
			}
		} catch (IOException ignored) {}
		
		return nbt;
	}

	@Override
	public ItemStack decrStackSize(int slot, int amount) {
		ItemStack stack = getStackInSlot(slot);
		if(stack != null) {
			if (stack.stackSize > amount) {
				stack = stack.splitStack(amount);
				markDirty();
			} else {
				setInventorySlotContents(slot, null);
			}
		}
		return stack;
	}

	@Override
	public void setInventorySlotContents(int slot, ItemStack stack) {
		if(stack != null) {
			stack.stackSize = Math.min(stack.stackSize, this.getInventoryStackLimit());
		}

		slots[slot] = stack;
		markDirty();
	}

	@Override
	public ItemStack getStackInSlotOnClosing(int slot) {
		ItemStack stack = getStackInSlot(slot);
		setInventorySlotContents(slot, null);
		return stack;
	}

	@Override public ItemStack getStackInSlot(int slot) { return slots[slot]; }

	@Override public boolean isUseableByPlayer(EntityPlayer player) { return true; }
	@Override public boolean isItemValidForSlot(int slot, ItemStack stack) { return true; }
	@Override public int getInventoryStackLimit() { return 64; }

	@Override public void openInventory() { player.worldObj.playSoundEffect(player.posX, player.posY, player.posZ, "hbm:block.crateOpen", 1.0F, 0.8F); }
	@Override public void closeInventory() { player.worldObj.playSoundEffect(player.posX, player.posY, player.posZ, "hbm:block.crateClose", 1.0F, 0.8F); }
}