from sys import exit
from random import randrange
import scene_list


class Engine(object):
    scenes = {
        "Scene1": Scene1(),
        "Scene2": Scene2(),
        "Scene3": Scene3(),
        "GameOver": GameOver(),
        }

    def __init__(self, scene):
        self.scene = scene


    def first(self):
        return self.next_scene(self.scene)


    def following(self, next_scene):
        value = Engine.scenes.get(next_scene)
        return value


    def play(self):
        current = self.scene.first()
        final = self.scene.following("GameOver")

        while current is not final:
            scene = current.start()
            current = self.scene.following(scene)