Crafting twice as many planks for players with rank

Hello,

I'm currently trying to use the PrepareItemCraftEvent and ItemCraftEvent to make it so if players have a certain permissions rank. Currently I've ruled out using the ItemCraftEvent and I think I still need to use the PrepareItemCraftEvent.

This is what I currently have.

Code (Text):

    @EventHandler
    public void craftItem(PrepareItemCraftEvent event) {

        Material itemType = event.getRecipe().getResult().getType();

        if(!(itemType == Material.DIAMOND_PICKAXE || itemType == Material.DIAMOND_AXE || itemType == Material.DIAMOND_HOE || itemType == Material.DIAMOND_SPADE || itemType == Material.DIAMOND_SWORD ||
                itemType == Material.DIAMOND_HELMET || itemType == Material.DIAMOND_CHESTPLATE || itemType == Material.DIAMOND_LEGGINGS || itemType == Material.DIAMOND_BOOTS || itemType == Material.WOOD))
            return;

        for(HumanEntity he : event.getViewers()) {
            if(he instanceof Player) {
                if((itemType == Material.DIAMOND_PICKAXE || itemType == Material.DIAMOND_AXE) && !(PyxisCore.perms.playerInGroup((Player) he, "Craftsman"))) {
                    event.getInventory().setResult(new ItemStack(Material.AIR));
                    he.sendMessage(ChatColor.RED + "You must unlock the Craftsman path before crafting this item.");
                    return;
                } else if((itemType == Material.DIAMOND_HOE || itemType == Material.DIAMOND_SPADE) && !(PyxisCore.perms.playerInGroup((Player) he, "Harvester"))) {
                    event.getInventory().setResult(new ItemStack(Material.AIR));
                    he.sendMessage(ChatColor.RED + "You must unlock the Harvester path before crafting this item.");
                    return;
                } else if(itemType == Material.DIAMOND_SWORD && !(PyxisCore.perms.playerInGroup((Player) he, "Ninja"))) {
                    event.getInventory().setResult(new ItemStack(Material.AIR));
                    he.sendMessage(ChatColor.RED + "You must unlock the Ninja path before crafting this item.");
                    return;
                } else if(itemType == Material.WOOD && PyxisCore.perms.playerInGroup((Player) he, "Craftsman")) {
                    event.getInventory().getResult().setAmount(6);
                }
            }
        }
    }

Any idea on how I could change this to make it work?

Thanks.

 

Wouldn't that add a recipe for everyone instead of just for people with a certain permission though? I'm trying to make it so if you're in a certain group you can craft more planks.