npc.py

import items


class NonPlayableCharacter():
    def __init__(self):
        raise NotImplementedError("Do not create raw NPC objects.")

    def __str__(self):
        return self.name


class Trader(NonPlayableCharacter):
    def __init__(self):
        self.name = "Trader"
        self.gold = 100
        self.inventory = [items.CrustyBread(),
                          items.CrustyBread(),
                          items.CrustyBread(),
                          items.HealingPotion(),
                          items.HealingPotion()]

    def trader(self, buyer, seller):
        for i, item in enumerate(seller.inventory, 1):
            print("{}. {} - {} Gold".format(i, item.name, item.value))
        while True:
            user_input = input("Choose an item or press Q to Exit: ")
            if user_input in ['q', 'Q']:
                return
            else:
                try:
                    choice = int(user_input)
                    to_swap = seller.inventory[choice - 1]
                    self.swap(seller, buyer, to_swap)
                except ValueError:
                    print("Invalid choice!")

    def swap(self, seller, buyer, item):
        if item.value > buyer.gold:
            print("That's too expensive")
            return
        seller.inventory.remove(item)
        buyer.inventory.append(item)
        seller.gold = seller.gold + item.value
        buyer.gold = buyer.gold - item.value
    print("Trade complete!")

    def check_if_trade(self, player):
        while True:
            print("Would you like to (B)uy, (S)ell, or (Q)uit?")
            user_input = input()
            if user_input in ['Q', 'q']:
                return
            elif user_input in ['B', 'b']:
                print("Here's whats available to buy: ")
                self.trade(buyer=player, seller=self.trader)
            elif user_input in ['S', 's']:
                print("Here's whats available to sell: ")
                self.trade(buyer=self.trader, seller=player)
            else:
                print("Invalid choice!")

    def intro_text(self):
        return """
                A frail not-quite-human,
                 not-quite-creature squats in the corner
                 clinking his gold coins together. He looks willing to trade.
                 """