import pygame
import time
import random

pygame.init()

# Screen dimensions
screen_width = 800
screen_height = 600

# Colors
white = (255, 255, 255)
red = (213, 50, 80)
green = (0, 255, 0)
black = (0, 0, 0)

# Snake block size and speed
block_size = 20
snake_speed = 15

# Create the display
dis = pygame.display.set_mode((screen_width, screen_height))
pygame.display.set_caption("Snake Game")


# Snake function to draw the snake
def our_snake(block_size, snake_list):
    for x in snake_list:
        pygame.draw.rect(dis, green, [x[0], x[1], block_size, block_size])


# Game loop
def game_loop():
    game_over = False
    game_close = False

    # Initial position of the snake
    snake_x = screen_width / 2
    snake_y = screen_height / 2

    # Initial speed of the snake
    snake_x_change = 0
    snake_y_change = 0

    # Snake body (a list of coordinates)
    snake_list = []
    length_of_snake = 1

    # Initial position of the food
    food_x = (
        round(random.randrange(0, screen_width - block_size) / block_size) * block_size
    )
    food_y = (
        round(random.randrange(0, screen_height - block_size) / block_size) * block_size
    )

    while not game_over:
        while game_close == True:
            dis.fill(white)
            font_style = pygame.font.SysFont(None, 50)
            message = font_style.render(
                "You Lost! Press Q-Quit or C-Play Again", True, black
            )
            dis.blit(message, [screen_width / 6, screen_height / 3])

            pygame.display.update()

            for event in pygame.event.get():
                if event.type == pygame.KEYDOWN:
                    if event.key == pygame.K_q:
                        game_over = True
                        game_close = False
                    if event.key == pygame.K_c:
                        game_loop()

        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                game_over = True
            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_LEFT:
                    snake_x_change = -block_size
                    snake_y_change = 0
                elif event.key == pygame.K_RIGHT:
                    snake_x_change = block_size
                    snake_y_change = 0
                elif event.key == pygame.K_UP:
                    snake_y_change = -block_size
                    snake_x_change = 0
                elif event.key == pygame.K_DOWN:
                    snake_y_change = block_size
                    snake_x_change = 0

        if (
            snake_x >= screen_width
            or snake_x < 0
            or snake_y >= screen_height
            or snake_y < 0
        ):
            game_close = True

        snake_x += snake_x_change
        snake_y += snake_y_change
        dis.fill(white)

        pygame.draw.rect(dis, red, [food_x, food_y, block_size, block_size])
        snake_head = []
        snake_head.append(snake_x)
        snake_head.append(snake_y)
        snake_list.append(snake_head)
        if len(snake_list) > length_of_snake:
            del snake_list[0]

        for x in snake_list[:-1]:
            if x == snake_head:
                game_close = True

        our_snake(block_size, snake_list)
        pygame.display.update()

        if snake_x == food_x and snake_y == food_y:
            food_x = (
                round(random.randrange(0, screen_width - block_size) / block_size)
                * block_size
            )
            food_y = (
                round(random.randrange(0, screen_height - block_size) / block_size)
                * block_size
            )
            length_of_snake += 1

        pygame.display.update()

        pygame.time.Clock().tick(snake_speed)

    pygame.quit()
    quit()


game_loop()