Minecraft/Forge 1.7.2 Infused Metals Repair Helper Function

package izzyaxel.InfusedMetals;

import net.minecraft.inventory.InventoryCrafting;

public class CraftingHelper
{
    public static int repairHelper(InventoryCrafting crafting)
    {
        int firstItem = -1;
        int secondItem = -1;
        int firstMaxDamage = 0;
        int secondMaxDamage = 0;
        int numItems = 0;
        int combinedDurability = 0;

        for (int i = 1; i < crafting.getSizeInventory(); i++)
        {
            if (crafting.getStackInSlot(i) != null)
            {
                numItems = numItems + 1;
                if (numItems == 2)
                {
                    i = 10;
                }
                if (firstItem == secondItem)
                {
                    firstItem = crafting.getStackInSlot(i).getItemDamage();
                    firstMaxDamage = crafting.getStackInSlot(i).getMaxDamage();
                }
                else
                    secondItem = crafting.getStackInSlot(i).getItemDamage();
                    secondMaxDamage = crafting.getStackInSlot(i).getMaxDamage();
            }
        }

        combinedDurability = (firstMaxDamage - firstItem) + (secondMaxDamage - secondItem);
        combinedDurability = firstMaxDamage - combinedDurability - 1;
        if (combinedDurability < 0)
        {
            combinedDurability = 0;
        }
        return combinedDurability;
    }
}