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()
        self.gunshot = pygame.mixer.Sound("gunshot.wav")
    def shoot(self):
        self.gunshot.play()
        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]


class GameState():
    def __init__(self):
        self.state = 'intro'

    def intro(self):
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                pygame.quit()
                sys.exit()
            if event.type == pygame.MOUSEBUTTONDOWN:
                self.state ='main_game'

        #draw background
        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()))

        screen.blit(ready_text, (screen_width/2 -115,screen_height/2 -33))
        crosshair_group.draw(screen)
        crosshair_group.update()
        pygame.display.flip()


    def main_game (self):
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                pygame.quit()
                sys.exit()
            if event.type == pygame.MOUSEBUTTONDOWN:
                crosshair.shoot()
        
            #draw background
        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()))

        crosshair_group.draw(screen)
        target_group.draw (screen)
        crosshair_group.update()
        pygame.display.flip()
        

    def stage_manager(self):
        if self.state == 'intro':
            self.intro()
        if self.state == 'main_game':
            self.main_game()

    

#setup
pygame.init()
clock = pygame.time.Clock()
game_state= GameState ()


# Screen Of Game
screen_width = 1400
screen_height = 740
screen = pygame.display.set_mode((screen_width,screen_height))
pygame.display.set_caption("Sprites")
background = pygame.image.load("bg_blue.png")
ready_text = pygame.image.load ("ready_text.png")
pygame.mouse.set_visible(False)

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

# Calculate Number of Tiles
num_tiles_x=(screen_width//background.get_width()) +1
num_tiles_y=(screen_height//background.get_height()) +1

#target
target_group = pygame.sprite.Group()
for target in range(20):
    new_target = Target("icon_target.png",random.randrange(0,screen_width),random.randrange(0,screen_height))
    target_group.add(new_target)

while True:
    game_state.stage_manager()
    clock.tick(60)