Alchemy Class

public class AlchemyListener implements Listener {
    GRPG plugin = GRPG.getPlugin(GRPG.class);

    ArrayList<Material> lvl1Pots = new ArrayList<Material>(Arrays.asList(Material.NETHER_WARTS, Material.SPECKLED_MELON, Material.SUGAR));
    ArrayList<Material> lvl5Pots = new ArrayList<Material>(Arrays.asList(Material.RABBIT_FOOT, Material.SPIDER_EYE));
    ArrayList<Material> lvl10Pots = new ArrayList<Material>(Arrays.asList(Material.GOLDEN_CARROT, Material.BLAZE_POWDER));
    ArrayList<Material> lvl15Pots = new ArrayList<Material>(Arrays.asList(Material.RAW_FISH, Material.GHAST_TEAR));
    ArrayList<Material> lvl20Pots = new ArrayList<Material>(Arrays.asList(Material.MAGMA_CREAM, Material.FERMENTED_SPIDER_EYE));


    @EventHandler
    public void brewEvent(BrewEvent e) {
        Player p = Bukkit.getPlayer(BlockLockerAPI.getOwner(e.getBlock()).get().getUniqueId());
        if(p != null) {
            Material ingredient = e.getContents().getIngredient().getType();

            if(ingredient != null && !ingredient.equals(Material.AIR)) {
                int alchLvl = GRPG.levelManagerHashMap.get(p.getUniqueId()).getSkillLevelWithBonus(SKILLS.ALCHEMY);
                if(alchLvl < 1) alchLvl = 1;
                if(canBrew(ingredient, alchLvl)) {
                    int potions = countPotions(e.getContents());
                    int[] minMax = new int[2];
                    minMax[0] = plugin.getExpConfig().getExp(ExpConfig.alchemyPath + "min");
                    minMax[1] = plugin.getExpConfig().getExp(ExpConfig.alchemyPath + "max");
                    int rXp = GRPG.randomXp(minMax[0], minMax[1]) * potions;
                    p.sendMessage(GRPG.gaiaPrefix + "You recieved " + rXp + " xp in alchemy for crafting " + ChatColor.BLUE + potions + ChatColor.WHITE + " potions.");
                    Utilities.giveExperience(SKILLS.ALCHEMY, p, rXp);
                } else {
                    e.setCancelled(true);
                    p.sendMessage(GRPG.gaiaPrefix + ChatColor.RED + "You do not have the alchemy level to brew this potion.");
                }
            }
        }
    }

    private boolean canBrew(Material ingr, int lvl) {
        if(lvl1Pots.contains(ingr) && lvl >= 1) return true;
        if(lvl5Pots.contains(ingr) && lvl >= 5) return true;
        if(lvl10Pots.contains(ingr) && lvl >= 10) return true;
        if(lvl15Pots.contains(ingr) && lvl >= 15) return true;
        if(lvl20Pots.contains(ingr) && lvl >= 20) return true;
        return false;
    }

    private int countPotions(BrewerInventory i) {
        int count = 0;
        if(i.getItem(0).getType() == Material.POTION) count++;
        if(i.getItem(1).getType() == Material.POTION) count++;
        if(i.getItem(2).getType() == Material.POTION) count++;
        return count;
    }


}