import pygame

class Animation:

    def __init__(self, frame_duration):
        self.reset_ticks()
        self.updates_this_cycle = 1
        self.overflow = 0
        self.update_count = 1
        self.actual_frame_duration = 0
        self.target_frame_duration = frame_duration
        self.stopping = False

    def reset_ticks(self):
        self.last_ticks = self.get_ticks()

    def play(self):
        while not self.stopping:
            self.advance_frame()
            self.update_frame_duration()
            self.update_overflow()
        self.stopping = False

    def advance_frame(self):
        while self.update_count > 0:
            self.sequence()
            self.update_count -= 1

    def update_frame_duration(self):
        last_ticks = self.last_ticks
        actual_frame_duration = self.get_ticks() - last_ticks
        last_ticks = self.get_ticks()
        wait_duration = self.get_configuration()["display-wait-duration"]
        while actual_frame_duration < self.target_frame_duration:
            pygame.time.wait(wait_duration)
            actual_frame_duration += self.get_ticks() - last_ticks
            last_ticks = self.get_ticks()
        self.actual_frame_duration = actual_frame_duration
        self.last_ticks = last_ticks

    def get_ticks(self):
        return pygame.time.get_ticks()

    def update_overflow(self):
        self.update_count = 1
        target_frame_duration = self.target_frame_duration
        overflow = self.overflow
        overflow += self.actual_frame_duration - target_frame_duration
        while overflow > target_frame_duration:
            self.update_count += 1
            overflow -= target_frame_duration
        overflow = self.overflow

    def stop(self):
        self.stopping = True

    def clear_queue(self):
        self.update_count = 1

from pygame import event
from pygame.locals import *

from GameChild import *

class EventDelegate(GameChild):

    command_event = USEREVENT
    state_change_event = USEREVENT + 1

    def __init__(self, game):
        GameChild.__init__(self, game)
        self.subscribers = dict()
        self.disable()

    def enable(self):
        self.enabled = True

    def disable(self):
        self.enabled = False

    def dispatch_events(self):
        if self.enabled:
            subscribers = self.subscribers
            for evt in event.get():
                kind = evt.type
                if kind in subscribers:
                    for subscriber in subscribers[kind]:
                        subscriber(evt)
        else:
            event.pump()

    def add_subscriber(self, kind, callback):
        subscribers = self.subscribers
        if kind not in subscribers:
            subscribers[kind] = list()
        subscribers[kind].append(callback)

    @classmethod
    def post_event(self, id, **kw):
        event.post(event.Event(id, **kw))

import sys

import pygame
from pygame.locals import *

from GameChild import *
from Animation import *
from Audio import *
from Display import *
from configuration.Configuration import *
from EventDelegate import *
from Input import *
from ScreenGrabber import *
from introduction.Introduction import *
from world.World import *

class Game(GameChild, Animation):
    
    def __init__(self):
        GameChild.__init__(self)
        self.configuration = Configuration()
        Animation.__init__(self, self.configuration["display-frame-duration"])
        pygame.init()
        self.add_children()
        self.subscribe_to_events()
        self.clear_queue()
        self.delegate.enable()
        self.introduction.activate()

    def add_children(self):
        self.audio = Audio(self)
        self.display = Display(self)
        self.delegate = EventDelegate(self)
        self.input = Input(self)
        self.screen_grabber = ScreenGrabber(self)
        self.introduction = Introduction(self)
        self.world = World(self)

    def subscribe_to_events(self):
        self.subscribe_to(QUIT, self.end)
        self.subscribe_to(Input.command_event, self.end)

    def get_configuration(self):
        return self.configuration

    def get_input(self):
        return self.input

    def sequence(self):
        self.delegate.dispatch_events()
        self.world.update()
        pygame.display.update()

    def end(self, evt):
        if evt.type == QUIT or evt.command == "quit":
            sys.exit()

from pygame.mixer import Channel, Sound, music

from GameChild import *

class Audio(GameChild):

    def __init__(self, game):
        GameChild.__init__(self, game)
        self.set_channels()

    def set_channels(self):
        config = self.get_configuration()
        self.bg_channel = Channel(config["audio-bg-channel"])

    def play_bgm(self, path, stream=False):
        if stream:
            self.bg_channel.stop()
            music.load(path)
            music.play(-1)
        else:
            music.stop()
            self.bg_channel.play(Sound(path), -1)

from transistors.GameChild import *
from slides.Slides import *

from transistors.EventDelegate import *

class Introduction(GameChild):

    def __init__(self, parent):
        GameChild.__init__(self, parent)
        self.slides = Slides(self)
        self.subscribe_to_events()

    def subscribe_to_events(self):
        self.subscribe_to(EventDelegate.command_event, self.advance)

    def reset(self):
        self.slides.reset()

    def activate(self):
        self.active = True
        self.set_music()
        self.draw()

    def deactivate(self):
        self.active = False

    def set_music(self):
        self.get_audio().play_bgm(self.get_resource("introduction-music-path"))

    def advance(self, evt):
        if self.active and evt.command == "release":
            if self.slides.advance():
                self.draw()
            else:
                self.deactivate()
                EventDelegate.post_event(EventDelegate.state_change_event,
                                         state="introduction-finished")

    def draw(self):
        self.slides.draw()