第二天：创建型模式--抽象工厂模式

# 青蛙类
class Frog:
    def __init__(self, name):
        self.name = name

    def __str__(self):
        return self.name

    def interact_with(self, obstacle):
        print('{} the Forg encounters {} and {}!'.format(self, obstacle, obstacle.action()))


# 虫子类
class Bug:
    def __str__(self):
        return 'a bug'

    def action(self):
        return 'eats it'


# 青蛙虫子游戏类
class FrogWorld:
    def __init__(self, name):
        print(self)
        self.player_name = name

    def __str__(self):
        return '\n\n\t----- Forg World ------'

    def make_character(self):
        return Frog(self.player_name)

    def make_obstacle(self):
        return Bug()


# 巫师类
class Wizard:
    def __init__(self, name):
        self.name = name

    def __str__(self):
        return self.name

    def interact_with(self, obstacle):
        print(self)
        print('{} the Wizard battles against {} and {}!'.format(self, obstacle, obstacle.action()))


# 怪兽类
class Ork:
    def __str__(self):
        return 'an evil ork'

    def action(self):
        return 'kills it'


# 巫师世界游戏类
class WizardWorld:
    def __init__(self, name):
        print(self)
        self.player_name = name

    def __str__(self):
        return '\n\n\t------ Wizard World ------'

    def make_character(self):
        return Wizard(self.player_name)

    def make_obstacle(self):
        return Ork()


# 游戏入口类
class GameEnvironment:
    def __init__(self, factory):
        # 创建角色
        self.hero = factory.make_character()
        # 创建障碍物
        self.obstacle = factory.make_obstacle()

    def play(self):
        self.hero.interact_with(self.obstacle)


# 验证输入的年龄
def validate_age(name):
    try:
        age = input('Welcome {}.How old are you ?'.format(name))
        age = int(age)
    except ValueError as err:
        print("Age {} is invalid, please try again...".format(age))
        return (False, age)
    return (True, age)


def main():
    name = input("Hello. What's tour name? ")
    valid_input = False
    while not valid_input:
        valid_input, age = validate_age(name)
    game = FrogWorld if age < 18 else WizardWorld
    environment = GameEnvironment(game(name))
    environment.play()


if __name__ == '__main__':
    main()