from gamelib import research


class Product(object):
    NAME = None
    PREREQUISITES = ()

    def __init__(self):
        self.points = 0

    def spend_points(self, points):
        self.points += points


class MachineGun(Product):
    NAME = "Machine gun"


class TeslaGun(Product):
    NAME = "Tesla gun"
    PREREQUISITES = (
        (research.Tesla, 1),
        )


class DoomsdayVirus(Product):
    NAME = "Doomsday virus"
    PREREQUISITES = (
        (research.BioGenetics, 5),
        )