import pygame, sys, random
skier_images = ["skier_down.png", 'skier_right1.png', 'skier_right2.png', 'skier_left1.png', 'skier_left2.png']
class SkierClass(pygame.sprite.Sprite):
        def __init__(self):
                pygame.sprite.Sprite.__init__(self)
                self.image = pygame.image.load("skier_down.png")
                self.rect = self.image.get_rect()
                self.rect.center = [320,100]
                self.angle = 0
        def turn(self, direction):
                self.angle = self.angle + direction
                if self.angle < -2: self.angle = -2
                if self.angle > 2: self.angle = 2
                center = self.rect.center
                self.image = pygame.image.load(skier_images[self.angle])
                self.rect = self.image.get_rect()
                self.rect.center = center
                speed = [self.angle, 6- abs(self.angle)*2]
                return speed
        def move(self, speed):
                self.rect.centerx = self.rect.centerx + speed[0]
                if self.rect.centerx < 20: self.rect.centerx = 20
                if self.rect.centerx > 620: self.rect.centerx = 620
class ObstacleClass(pygame.sprite.Sprite):
        def __init__(self, image_file, location, type):
                pygame.sprite.Sprite.__init__(self)
                self.image_file = image_file
                self.image = pygame.image.load(image_file)
                self.rect = self.image.get_rect()
                self.rect.center = location
                self.type = type
                self.passed = False
        def update(self):
                global speed
                self.rect.centery -= speed[1]
                if self.rect.centery < -32:
                        self.kill

def create_map():
        global obstacles
        locations = []
        for i in range(10):
                row = random.randint(0, 9)
                col = random.randint(0, 9)
                if not (location in locations):
                        locations.append(location)
                        type = random.choice(["tree", "flag"])
                        if type == "tree": img = "skier_tree.png"
                        elif type == "flag": img = "skier_flag.png"
                        obstacle = ObstacleClass(img, location, type)
                        obstacles.add(obstacle)
def animate():
        screen.fill([255,255,255])
        obstacles.draw(screen)
        obstacles.draw(screen)
        screen.blit(skier.image, skier.rect)
        screen.blit(score_text, [10,10])
        pygame.display.flip()
pygame.init()
screen = pygame.display.set_mode([640,640])
clock = pygame.time.Clock()
skier = SkierClass()
speed = [0,6]
obstacles = pygame.sprite.Group()
map_position = 0
points = 0
create_map()
font = pygame.font.Font(None, 50)
running = True
while running:
        clock.tick(30)
        for event in pygame.event.get():
                if event.type == pygame.QUIT:
                        running = False
                if event.type == pygame.KEYDOWN:
                        if event.key == pygame.K_LEFT:
                                speed = skier.turn(-1)
                        elif event.key == pygame.K_RIGHT:
                                speed = skier.turn(1)
        skier.move(speed)
        map_position += speed[1]
        if map_position >=640:
                create_map()
                map_position = 0
        hit = pygame.sprite.spritecollide(skier, obstacles, False)
        if hit:
                if hit[0].type == 'tree' and not hit[0].passed:
                                points = points - 100
                skier.image = pygame.image.load('skier_crash.png')
                animate()
                pygame.time.delay(1000)
                skier.image = pygame.image.load('skier_down.png')
                skier.angle = 0
                speed = [0, 6]          
                hit[0].passed = True
                if hit[0].type == "flag" and not hit[0].passed:
                            points += 10
                hit[0].kill()
        obstacles.update()
        score_text = font.render("Score: " +str(points), 1, (0,0,0))
        animate()
pygame.quit()