import pygame, sys, random

class Crosshair(pygame.sprite.Sprite):
    def __init__(self,picture_path):
        super().__init__()
        self.image = pygame.image.load(picture_path)
        self.rect = self.image.get_rect()
    def shoot(self):
        pygame.sprite.spritecollide(crosshair,target_group,True)
    def update(self):
        self.rect.center = pygame.mouse.get_pos()

class Target(pygame.sprite.Sprite):
    def __init__(self,picture_path,pos_x,pos_y):
        super().__init__()
        self.image = pygame.image.load(picture_path)
        self.rect = self.image.get_rect()
        self.rect.center = [pos_x,pos_y]

pygame.init()
clock = pygame.time.Clock()

screen_x = 1080
screen_y = 720
screen = pygame.display.set_mode((screen_x,screen_y))
background = pygame.image.load("BG.png")
pygame.mouse.set_visible(False)

crosshair = Crosshair("crosshair.png")
crosshair_group = pygame.sprite.Group()
crosshair_group.add(crosshair)

target_group = pygame.sprite.Group()
for target in range(20):
    new_target = Target("target.png",random.randrange(0,screen_x), random.randrange(0, screen_y))
    target_group.add(new_target)

num_tiles_x = (screen_x // background.get_width()) + 1
num_tiles_y = (screen_y // background.get_height()) + 1


while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit
            sys.exit()
        if event.type == pygame.MOUSEBUTTONDOWN:
            crosshair.shoot()

    for y in range(num_tiles_y):
        for x in range(num_tiles_x):
            screen.blit(background, (x * background.get_width(), y * background.get_height()))


    target_group.draw(screen)
    crosshair_group.draw(screen)
    crosshair_group.update()
    pygame.display.flip()
    clock.tick(60)