import pygame
from pygame.sprite import Group                 #导入pygame模块下sprite子模块中的Group类
from settings import Settings               #导入自定义的Settings类
from ship import Ship               #导入自定义的Ship类
import game_functions as gf                 #导入自定义的game_functions类，并起别名为gf
from game_stats import GameStats                #导入自定义的GameStats类
from button import Button               #导入自定义的Button类
from scoreboard import Scoreboard               #导入自定义的Scoreboard类


def run_game():
    # 初始化pygame、设置和屏幕对象
    pygame.init()
    ai_settings = Settings()            #实例化Settings类
    screen = pygame.display.set_mode((ai_settings.screen_width, ai_settings.screen_height))             #调用display模块的set_mode()方法设置屏幕大小
    pygame.display.set_caption("Alien Invasion")            #调用display模块的set_caption()方法设置标题

    # 创建Play按钮
    play_button = Button(ai_settings, screen, "Play")           #实例化Button类

    # 创建存储游戏统计信息的实例，并创建记分牌
    stats = GameStats(ai_settings)              #实例化GameStats类
    sb = Scoreboard(ai_settings, screen, stats)             #实例化Scoreboard类

    # 创建一艘飞船、一个子弹编组和一个外星人编组
    ship = Ship(ai_settings, screen)                #实例化Ship类
    bullets = Group()               #实例化Group类
    aliens = Group()                #实例化Group类

    # 创建外星人群
    gf.create_fleet(ai_settings, screen, ship, aliens)              #调用gf模块的create_fleet()函数

    # 开始游戏的主循环
    while True:
        # 监视键盘和鼠标事件
        gf.check_events(ai_settings, screen, stats, sb, play_button, ship, aliens, bullets)             #调用gf模块的check_events()函数，监测键盘和鼠标的事件

        if stats.game_active:
            ship.update()               #调用Ship类的update()方法
            gf.update_bullets(ai_settings, screen, stats, sb, ship, aliens, bullets)                #调用gf模块的update_bullets函数，更新子弹的状态
            gf.update_aliens(ai_settings, screen, stats, sb, ship, aliens, bullets)             #调用gf模块的update_aliens函数，更新外星人的状态

        gf.update_screen(ai_settings, screen, stats, sb, ship, aliens, bullets, play_button)                #调用gf模块的update_screen函数，更新屏幕的状态


run_game()                  #运行游戏