import pygame.py

import pygame
import time
import random

pygame.init()

black = pygame.Color(0, 0, 0)
white = pygame.Color(255, 255, 255)
red = pygame.Color(255, 0, 0)
green = pygame.Color(0, 255, 0)
yellow = pygame.Color(255, 255, 0)

window_x = 720
window_y = 480
game_window = pygame.display.set_mode((window_x, window_y))
pygame.display.set_caption('Snake Game by Muhammad Daud')

snake_speed = 15
snake_position = [100, 50]
snake_body = [[100, 50], [90, 50], [80, 50], [70, 50]]
fruit_position = [random.randrange(1, (window_x // 10)) * 10,
                  random.randrange(1, (window_y // 10)) * 10]
fruit_spawn = True
direction = 'RIGHT'
change_to = direction
score = 0

fps = pygame.time.Clock()

def show_score(color, font, size):
    score_font = pygame.font.SysFont(font, size)
    score_surface = score_font.render('Score: ' + str(score), True, color)
    score_rect = score_surface.get_rect()
    score_rect.midtop = (window_x / 2, 10)
    game_window.blit(score_surface, score_rect)

def game_over():
    my_font = pygame.font.SysFont('times new roman', 50)
    game_over_surface = my_font.render('Your Score is: ' + str(score), True, red)
    game_over_rect = game_over_surface.get_rect()
    game_over_rect.midtop = (window_x / 2, window_y / 3)
    game_window.blit(game_over_surface, game_over_rect)
    
    developed_by_surface = my_font.render('Developed by Muhammad Daud', True, yellow)
    developed_by_rect = developed_by_surface.get_rect()
    developed_by_rect.midtop = (window_x / 2, window_y / 2)
    game_window.blit(developed_by_surface, developed_by_rect)
    
    pygame.display.flip()
    time.sleep(3)
    pygame.quit()
    quit()

while True:
    for event in pygame.event.get():
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_UP:
                change_to = 'UP'
            if event.key == pygame.K_DOWN:
                change_to = 'DOWN'
            if event.key == pygame.K_LEFT:
                change_to = 'LEFT'
            if event.key == pygame.K_RIGHT:
                change_to = 'RIGHT'

    if change_to == 'UP' and direction != 'DOWN':
        direction = 'UP'
    if change_to == 'DOWN' and direction != 'UP':
        direction = 'DOWN'
    if change_to == 'LEFT' and direction != 'RIGHT':
        direction = 'LEFT'
    if change_to == 'RIGHT' and direction != 'LEFT':
        direction = 'RIGHT'

    if direction == 'UP':
        snake_position[1] -= 10
    if direction == 'DOWN':
        snake_position[1] += 10
    if direction == 'LEFT':
        snake_position[0] -= 10
    if direction == 'RIGHT':
        snake_position[0] += 10

    snake_body.insert(0, list(snake_position))
    if snake_position[0] == fruit_position[0] and snake_position[1] == fruit_position[1]:
        score += 10
        fruit_spawn = False
    else:
        snake_body.pop()
        
    if not fruit_spawn:
        fruit_position = [random.randrange(1, (window_x // 10)) * 10,
                          random.randrange(1, (window_y // 10)) * 10]
        
    fruit_spawn = True
    game_window.fill(black)
    
    for pos in snake_body:
        pygame.draw.rect(game_window, green, pygame.Rect(pos[0], pos[1], 10, 10))
    
    pygame.draw.rect(game_window, white, pygame.Rect(fruit_position[0], fruit_position[1], 10, 10))

    if snake_position[0] < 0 or snake_position[0] > window_x - 10:
        game_over()
    if snake_position[1] < 0 or snake_position[1] > window_y - 10:
        game_over()
    for block in snake_body[1:]:
        if snake_position[0] == block[0] and snake_position[1] == block[1]:
            game_over()

    show_score(white, 'times new roman', 20)
    pygame.display.update()
    fps.tick(snake_speed)