Arrays.stream(player.getInventory().getContents())
                    .filter(itemStack -> itemStack.getType() != Material.AIR)
                    .forEach(0, (sum, itemStack) -> {
                        if (itemStack.isSimilar(key) || key.getType() == Material.AIR)
                        {
                            if (itemStack.getAmount() >= key.getAmount())
                            {
                                if (itemStack.getAmount() == key.getAmount())
                                {
                                    player.getInventory().removeItem(itemStack);
                                }
                                else
                                {
                                    itemStack.setAmount(itemStack.getAmount() - key.getAmount());
                                }
                            }
                            else
                            {
                                amount += itemStack.getAmount();
                                itemStacks.add(itemStack);

                                if (amount >= key.getAmount())
                                {
                                    if (amount == key.getAmount())
                                    {
                                        for (ItemStack item : itemStacks)
                                        {
                                            player.getInventory().removeItem(item);
                                        }
                                    }
                                    else
                                    {
                                        for (ItemStack item : itemStacks)
                                        {
                                            if (key.getAmount() > item.getAmount())
                                            {
                                                key.setAmount(key.getAmount() - item.getAmount());
                                                player.getInventory().removeItem(item);
                                            }
                                            if (key.getAmount() == item.getAmount())
                                            {
                                                key.setAmount(0);
                                                player.getInventory().removeItem(item);
                                            }
                                            if (key.getAmount() < item.getAmount())
                                            {
                                                key.setAmount(0);
                                                item.setAmount(item.getAmount() - key.getAmount());
                                            }
                                        }
                                    }
                                }
                            }
                        }
                    });