ItemDrink.java

package com.team.kalstuff.item;

import net.minecraft.entity.EntityLivingBase;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.item.EnumAction;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.potion.Potion;
import net.minecraft.potion.PotionEffect;
import net.minecraft.stats.StatList;
import net.minecraft.util.ActionResult;
import net.minecraft.util.EnumActionResult;
import net.minecraft.util.EnumHand;
import net.minecraft.world.World;
import net.minecraftforge.items.ItemHandlerHelper;

public class ItemDrink extends Item {

	private int amount, potionLength = 0;
	private float saturation;
	private Potion potions[] = null;
	private ItemStack returnStack = ItemStack.EMPTY;
	
	public ItemDrink(int amount, float saturation)
	{
		this.amount = amount;
		this.saturation = saturation;
	}

	public ItemDrink(int amount, float saturation, int potionLength, Potion potion)
	{
		this.amount = amount;
		this.saturation = saturation;
		this.potionLength = potionLength;
		this.potions = new Potion[] {potion};
	}
	
	public ItemDrink(int amount, float saturation, int potionLength, Potion potions[])
	{
		this.amount = amount;
		this.saturation = saturation;
		this.potionLength = potionLength;
		this.potions = potions;
	}
	
	public ActionResult<ItemStack> onItemRightClick(World worldIn, EntityPlayer playerIn, EnumHand handIn)
    {
        playerIn.setActiveHand(handIn);
        return new ActionResult<ItemStack>(EnumActionResult.SUCCESS, playerIn.getHeldItem(handIn));
    }
    
	public EnumAction getItemUseAction(ItemStack stack) {
		return EnumAction.DRINK;
	}
	
	protected void addEffects(ItemStack stack, World worldIn, EntityPlayer player) {
		if (!worldIn.isRemote && this.potionLength != 0) {
			for (Potion p : this.potions)
			{
				try
				{
					player.addPotionEffect(new PotionEffect(p, ((this.potionLength / (this.getMaxDamage(stack) + 1)) + player.getActivePotionEffect(p).getDuration()), 0));
				}
				catch (NullPointerException e)
				{
					player.addPotionEffect(new PotionEffect(p, (this.potionLength / (this.getMaxDamage(stack) + 1)), 0));
				}
				
				if (player.getActivePotionEffect(p).getDuration() > 7200)
				{
					player.removePotionEffect(p);
					player.addPotionEffect(new PotionEffect(p, 7200, 0));
				}
			}

		}
    }
	
	public ItemStack onItemUseFinish(ItemStack stack, World worldIn, EntityLivingBase entityLiving) {
		
		if (worldIn.isRemote) return stack;
		if (entityLiving instanceof EntityPlayer) {
			EntityPlayer entityplayer = (EntityPlayer)entityLiving;
			entityplayer.getFoodStats().addStats(this.amount, this.saturation);
            this.addEffects(stack, worldIn, entityplayer);
            entityplayer.addStat(StatList.getObjectUseStats(this));
  	     }
		EntityPlayer player = entityLiving instanceof EntityPlayer ? ((EntityPlayer) entityLiving) : null;
		if (!player.isCreative())
		{
			if (stack.getCount() <= 1)
			return this.getReturnStack();

			else
			{
				// this code should never run under normal circumstances
				ItemHandlerHelper.giveItemToPlayer(player, this.getReturnStack());
				stack.shrink(1);
			}
		}
		return stack;
	}
	
	public ItemDrink setReturnStack(ItemStack stack)
	{
		this.returnStack = stack;
		return this;
	}

	public ItemDrink setReturnStack(Item item)
	{
		this.returnStack = new ItemStack(item);
		return this;
	}
	
	public ItemStack getReturnStack() {
		return this.returnStack.copy();
	}
	
	public int getAmount() {
		return this.amount;
	}
	
	public float getSaturation() {
		return this.saturation;
	}
	
    /**
     * How long it takes to use or consume an item
     */
	@Override
    public int getMaxItemUseDuration(ItemStack stack) {
        return 32;
    }
}