src/main/java/mekanism/common/item/ItemScubaTank.java

package mekanism.common.item;

import java.util.List;

import mekanism.api.EnumColor;
import mekanism.api.gas.Gas;
import mekanism.api.gas.GasRegistry;
import mekanism.api.gas.GasStack;
import mekanism.api.gas.IGasItem;
import mekanism.client.render.ModelCustomArmor;
import mekanism.client.render.ModelCustomArmor.ArmorModel;
import mekanism.common.Mekanism;
import net.minecraft.client.model.ModelBiped;
import net.minecraft.client.renderer.texture.IIconRegister;
import net.minecraft.creativetab.CreativeTabs;
import net.minecraft.entity.Entity;
import net.minecraft.entity.EntityLivingBase;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.item.ItemArmor;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraftforge.common.util.EnumHelper;
import cpw.mods.fml.relauncher.Side;
import cpw.mods.fml.relauncher.SideOnly;

public class ItemScubaTank extends ItemArmor implements IGasItem
{
	public int MAX_GAS = 24000;
	public int TRANSFER_RATE = 16;

	public ItemScubaTank()
	{
		super(EnumHelper.addArmorMaterial("SCUBATANK", 0, new int[] {0, 0, 0, 0}, 0), 0, 1);
		setCreativeTab(Mekanism.tabMekanism);
		setMaxDamage(100);
		setNoRepair();
	}

	@Override
	public void addInformation(ItemStack itemstack, EntityPlayer entityplayer, List list, boolean flag)
	{
		GasStack gasStack = getGas(itemstack);

		if(gasStack == null)
		{
			list.add("No gas stored.");
		}
		else {
			list.add("Stored " + gasStack.getGas().getLocalizedName() + ": " + gasStack.amount);
		}

		list.add(EnumColor.GREY + "Flowing: " + (getFlowing(itemstack) ? EnumColor.DARK_GREEN : EnumColor.DARK_RED) + getFlowing(itemstack));
	}

	@Override
	public boolean isValidArmor(ItemStack stack, int armorType, Entity entity)
	{
		return armorType == 1;
	}

	@Override
	public String getArmorTexture(ItemStack stack, Entity entity, int slot, String type)
	{
		return "mekanism:render/NullArmor.png";
	}

	@Override
	@SideOnly(Side.CLIENT)
	public ModelBiped getArmorModel(EntityLivingBase entityLiving, ItemStack itemStack, int armorSlot)
	{
		ModelCustomArmor model = ModelCustomArmor.INSTANCE;
		model.modelType = ArmorModel.SCUBATANK;
		return model;
	}

	public void useGas(ItemStack stack)
	{
		setGas(stack, new GasStack(getGas(stack).getGas(), getGas(stack).amount-1));
	}

	@Override
	public int getMaxGas(ItemStack itemstack)
	{
		return MAX_GAS;
	}

	@Override
	public int getRate(ItemStack itemstack)
	{
		return TRANSFER_RATE;
	}

	@Override
	public int addGas(ItemStack itemstack, GasStack stack)
	{
		if(getGas(itemstack) != null && getGas(itemstack).getGas() != stack.getGas())
		{
			return 0;
		}

		if(stack.getGas() != GasRegistry.getGas("oxygen"))
		{
			return 0;
		}

		int toUse = Math.min(getMaxGas(itemstack)-getStored(itemstack), Math.min(getRate(itemstack), stack.amount));
		setGas(itemstack, new GasStack(stack.getGas(), getStored(itemstack)+toUse));

		return toUse;
	}

	@Override
	public GasStack removeGas(ItemStack itemstack, int amount)
	{
		if(getGas(itemstack) == null)
		{
			return null;
		}

		Gas type = getGas(itemstack).getGas();

		int gasToUse = Math.min(getStored(itemstack), Math.min(getRate(itemstack), amount));
		setGas(itemstack, new GasStack(type, getStored(itemstack)-gasToUse));

		return new GasStack(type, gasToUse);
	}

	public int getStored(ItemStack itemstack)
	{
		return getGas(itemstack) != null ? getGas(itemstack).amount : 0;
	}

	public void toggleFlowing(ItemStack stack)
	{
		setFlowing(stack, !getFlowing(stack));
	}

	public boolean getFlowing(ItemStack stack)
	{
		if(stack.stackTagCompound == null)
		{
			return false;
		}

		return stack.stackTagCompound.getBoolean("flowing");
	}

	public void setFlowing(ItemStack stack, boolean flowing)
	{
		if(stack.stackTagCompound == null)
		{
			stack.setTagCompound(new NBTTagCompound());
		}

		stack.stackTagCompound.setBoolean("flowing", flowing);
	}

	@Override
	public boolean canReceiveGas(ItemStack itemstack, Gas type)
	{
		return type == GasRegistry.getGas("oxygen");
	}

	@Override
	public boolean canProvideGas(ItemStack itemstack, Gas type)
	{
		return false;
	}

	@Override
	public GasStack getGas(ItemStack itemstack)
	{
		if(itemstack.stackTagCompound == null)
		{
			return null;
		}

		GasStack stored = GasStack.readFromNBT(itemstack.stackTagCompound.getCompoundTag("stored"));

		if(stored == null)
		{
			itemstack.setItemDamage(100);
		}
		else {
			itemstack.setItemDamage((int)Math.max(1, (Math.abs((((float)stored.amount/getMaxGas(itemstack))*100)-100))));
		}

		return stored;
	}

	@Override
	public void setGas(ItemStack itemstack, GasStack stack)
	{
		if(itemstack.stackTagCompound == null)
		{
			itemstack.setTagCompound(new NBTTagCompound());
		}

		if(stack == null || stack.amount == 0)
		{
			itemstack.setItemDamage(100);
			itemstack.stackTagCompound.removeTag("stored");
		}
		else {
			int amount = Math.max(0, Math.min(stack.amount, getMaxGas(itemstack)));
			GasStack gasStack = new GasStack(stack.getGas(), amount);

			itemstack.setItemDamage((int)Math.max(1, (Math.abs((((float)amount/getMaxGas(itemstack))*100)-100))));
			itemstack.stackTagCompound.setTag("stored", gasStack.write(new NBTTagCompound()));
		}
	}

	public ItemStack getEmptyItem()
	{
		ItemStack empty = new ItemStack(this);
		setGas(empty, null);
		empty.setItemDamage(100);
		return empty;
	}

	@Override
	public void getSubItems(int i, CreativeTabs tabs, List list)
	{
		ItemStack empty = new ItemStack(this);
		setGas(empty, null);
		empty.setItemDamage(100);
		list.add(empty);

		ItemStack filled = new ItemStack(this);
		setGas(filled, new GasStack(GasRegistry.getGas("oxygen"), ((IGasItem)filled.getItem()).getMaxGas(filled)));
		list.add(filled);
	}

	@Override
	@SideOnly(Side.CLIENT)
	public void registerIcons(IIconRegister register) {}
}