from typing import Any

import pygame
from pygame.sprite import Sprite


class BackGround(Sprite):
    def __init__(self, ai_game):
        super().__init__()
        # 屏幕设置
        self.screen = ai_game.screen
        self.screen_rect = ai_game.screen.get_rect()
        self.settings = ai_game.settings

        # 获取背景
        self.image = pygame.image.load("resource/image/space-2.png").convert()
        self.image = pygame.transform.scale(self.image, (self.settings.screen_width, self.settings.screen_height))
        self.rect = self.image.get_rect()
        self.rect.bottom = self.screen_rect.bottom
        self.rect_height = self.rect.height
        # 背景移动设置
        self.ready_to_mov = 0

    def update(self, *args: Any, **kwargs: Any) -> None:
        if self.ready_to_mov == 0:
            self.rect.bottom += self.settings.bg_speed
            if self.rect.top >= self.screen_rect.bottom:
                self.rect.bottom = self.screen_rect.bottom - self.rect_height