---

import pygame
import random
import os

pygame.init()

# окно
WIDTH, HEIGHT = 600, 400
screen = pygame.display.set_mode((WIDTH, HEIGHT))
pygame.display.set_caption("Snake Game")

clock = pygame.time.Clock()

# цвета
WHITE = (255, 255, 255)
GREEN = (0, 200, 0)
RED = (200, 0, 0)
BLACK = (0, 0, 0)

BLOCK = 20
SPEED = 10

font = pygame.font.SysFont("Arial", 24)

# рекорд
HIGHSCORE_FILE = "highscore.txt"

def load_score():
    if os.path.exists(HIGHSCORE_FILE):
        return int(open(HIGHSCORE_FILE).read())
    return 0

def save_score(score):
    with open(HIGHSCORE_FILE, "w") as f:
        f.write(str(score))

def draw_snake(snake):
    for i, s in enumerate(snake):
        color = (0, 255, 0) if i == 0 else GREEN
        pygame.draw.rect(screen, color, (s[0], s[1], BLOCK, BLOCK))

def message(text, x, y):
    screen.blit(font.render(text, True, WHITE), (x, y))

def game():
    snake = [[100, 100]]
    direction = "RIGHT"

    food = [random.randrange(0, WIDTH, BLOCK), random.randrange(0, HEIGHT, BLOCK)]

    score = 0
    highscore = load_score()

    running = True
    while running:
        screen.fill(BLACK)

        # события
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                return

            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_UP and direction != "DOWN":
                    direction = "UP"
                if event.key == pygame.K_DOWN and direction != "UP":
                    direction = "DOWN"
                if event.key == pygame.K_LEFT and direction != "RIGHT":
                    direction = "LEFT"
                if event.key == pygame.K_RIGHT and direction != "LEFT":
                    direction = "RIGHT"

        # движение
        head = snake[0].copy()

        if direction == "UP":
            head[1] -= BLOCK
        if direction == "DOWN":
            head[1] += BLOCK
        if direction == "LEFT":
            head[0] -= BLOCK
        if direction == "RIGHT":
            head[0] += BLOCK

        snake.insert(0, head)

        # еда
        if head == food:
            score += 1
            food = [random.randrange(0, WIDTH, BLOCK), random.randrange(0, HEIGHT, BLOCK)]
        else:
            snake.pop()

        # стены
        if head[0] < 0 or head[0] >= WIDTH or head[1] < 0 or head[1] >= HEIGHT:
            running = False

        # сам себя
        if head in snake[1:]:
            running = False

        # рисуем
        draw_snake(snake)
        pygame.draw.rect(screen, RED, (food[0], food[1], BLOCK, BLOCK))

        message(f"Score: {score}", 10, 10)
        message(f"Best: {max(score, highscore)}", 10, 35)

        pygame.display.update()
        clock.tick(SPEED)

    # конец игры
    if score > highscore:
        save_score(score)

game()
pygame.quit()