import pygame
from pygame.sprite import Group
from alien import Alien
import game_functions as gf
from settings import Settings
from ship import Ship

def run_game():
    pygame .init()
    ai_settings = Settings()
    screen = pygame.display.set_mode((ai_settings.screen_width,ai_settings.screen_height))
    pygame.display.set_caption(" Alien Invasion")
    ship = Ship(ai_settings, screen)
    alien = Alien(ai_settings,screen)
    bullets = Group()
    aliens = Group()
    gf.create_fleet(ai_settings,screen,aliens)

    while True:
        gf.check_events(ai_settings,screen,ship,bullets)
        ship.update()
        gf.update_bullets(bullets)
        gf.update_screen(ai_settings,screen,ship,aliens,bullets)

run_game()