public void purchaseUpgrade(string gunName)
{
WeaponType weapon = weapons.equippedWeapons.Find(w => w.name == gunName);
if (weapon == null)
{
Debug.LogError("Gun is not equipped");
return;
}
if (rm.getEnergy() >= weapon.upgradeCost)
{
rm.useEnergy(weapon.upgradeCost);
weapon.upgrade();
}
}