from gamelib import research


# Kinds of product.
HAND_WEAPON = 'hand weapon'
VEHICLE = 'vehicle'
DOOMSDAY_DEVICE = 'doomsday device'
PATHOGEN = 'pathogen'


class Product(object):
    NAME = None
    PREREQUISITES = ()
    ACQUISITION_CHANCE = 0.8
    COST = None
    UPGRADE_REQUIREMENT = 1
    STARTING_PRODUCT = False
    SCIENCE_TYPE = 'product'
    CATEGORIES = ()

    def __init__(self, points=0):
        self.points = points

    def spend_point(self):
        self.points += 1

    def can_spend(self, lab):
        extra = self.UPGRADE_REQUIREMENT * self.points + 1
        return lab.meet_requirements(self, extra)


class MachineGun(Product):
    NAME = "Machine gun"
    COST = 100
    CATEGORIES = (HAND_WEAPON,)
    STARTING_PRODUCT = True

    def __init__(self, points=0):
        self.points = 1

    def spend_point(self):
        raise NotImplementedError()

    def can_spend(self, lab):
        return False


class LightningGun(Product):
    NAME = "Lightning gun"
    COST = 300
    CATEGORIES = (HAND_WEAPON,)
    PREREQUISITES = (
        (research.Tesla, 1),
        )


class TeslaTank(Product):
    NAME = "Tesla tank"
    COST = 1000
    CATEGORIES = (VEHICLE,)
    PREREQUISITES = (
        (research.Tesla, 3),
        )


class DoomsdayVirus(Product):
    NAME = "Doomsday virus"
    COST = 100000
    CATEGORIES = (DOOMSDAY_DEVICE, PATHOGEN)
    PREREQUISITES = (
        (research.Biogenetics, 5),
        )