Event

package me.xxx.xxxx;

import org.bukkit.ChatColor;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.inventory.InventoryClickEvent;
import org.bukkit.potion.PotionEffect;
import org.bukkit.potion.PotionEffectType;

import net.milkbowl.vault.economy.Economy;
import net.milkbowl.vault.economy.EconomyResponse;

public class UpgradeGUIEvent implements Listener {

    @SuppressWarnings("deprecation")
    @EventHandler
    public void ClickEvent(InventoryClickEvent e) {
        if(e.getClick().isLeftClick()) {
        Economy eco = Main.getEconomy();
        Player player = (Player) e.getWhoClicked();


        e.setCancelled(true);


        if(e.getClickedInventory().getTitle().equalsIgnoreCase(ChatColor.DARK_PURPLE + "Upgrade GUI"));



            switch(e.getCurrentItem().getType()) {

            case DIAMOND:

                player.closeInventory();
                player.sendMessage(ChatColor.YELLOW + "You have succesfully purchased the speed upgrade for 100 shards!");
                player.addPotionEffect((new PotionEffect(PotionEffectType.SPEED, 999999999, 1)));
                EconomyResponse responseSpeed = eco.withdrawPlayer(player, 100);
                player.sendMessage("test");
             break;
            case GOLD_INGOT:
                player.closeInventory();
                player.sendMessage(ChatColor.YELLOW + "You have succesfully purchased the resistance upgrade for 100 shards!");
                player.addPotionEffect((new PotionEffect(PotionEffectType.INCREASE_DAMAGE, 999999999, 1)));
                EconomyResponse responseResistance = eco.withdrawPlayer(player, 100);
                player.sendMessage(ChatColor.RED + "test");

            }


    }

    }

}