public string Purchase(PlayerPerk playerPerk = null, bool usePerkCurrency = true)
{
if (purchased > 0 && !repeatable)
{
return("Error trying to re-purchase non-repeatable perk");
}
if (repeatable && purchased >= limit)
{
return("Limit reached");
}
if (usePerkCurrency && playerPerk != null)
{
if (playerPerk.GetPerkCurrency() < cost)
{
return("Insufficient perk currency");
}
playerPerk.SpendCurrency(cost);
}
purchased += 1;
return("");
}