Remove one of one items kind from inventory

I want kind of an ammo system where a custom Material.GOLD_NUGGET is the ammo.
At the moment im checking if event.getPlayer.getInventory.containsAtLeast(CustomItems.SNIPER_AMMO, 1) before fireing... The problem is the removal of the item.
At the moment im using: (to lazy to convert my scala to 100% java code, if something is unclear ask)

Code:

ItemStack isRemoveAmmo = CustomItems.SNIPER_AMMO.clone()
isRemoveAmmo.setAmount(-1)
event.getPlayer.getInventory.addItem(isRemoveAmmo)

which is a bit buggy when a player has a whole stack. Then it adds a new stack with amount set to -1.
Is there a elegant way to do this?

 

https://hub.spigotmc.org/javadocs/bukkit/org/bukkit/inventory/Inventory.html

 

Wouldn't you just use this ?

Code:

player.getInventory().removeItem(isRemoveAmmo);
player.updateInventory();

 

because Player#updateInventory() "should not be relied on"

 

That method doesn't exist.

Of course it is adding a new ItemStack with -1, you never removed the old ItemStack, and since the player have a full stack (64) the method .addItem() can't add it to that ItemStack, that's why it will be added as a different ItemStack, and since you set it's amount to -1 it will be displayed like that.

I would make it like, a method with the amount of items to remove, then loop through player's inventory, checking if the item is the one that you want, if itemStack.getSize() - itemsToRemove > 0, then set the amount of the ItemStack to it, if not then remove to ItemToRemove the size of that itemStack and remove that ItemStack from the Inventory, and continue...

I hope you understand me, my english is not very good.