import pygame
import time
import random

# Initialize pygame
pygame.init()

# Define colors
WHITE = (255, 255, 255)
BLACK = (0, 0, 0)
RED = (213, 50, 80)
GREEN = (0, 255, 0)
BLUE = (50, 153, 213)

# Define screen size
SCREEN_WIDTH = 600
SCREEN_HEIGHT = 400

# Create the screen object
screen = pygame.display.set_mode((SCREEN_WIDTH, SCREEN_HEIGHT))
pygame.display.set_caption("Snake Game")

# Set up the clock
clock = pygame.time.Clock()

# Snake and food block size
BLOCK_SIZE = 10
SNAKE_SPEED = 15

# Font for displaying score
font_style = pygame.font.SysFont("bahnschrift", 25)
score_font = pygame.font.SysFont("comicsansms", 35)

# Function to display the current score
def display_score(score):
    value = score_font.render("Your Score: " + str(score), True, WHITE)
    screen.blit(value, [0, 0])

# Function to draw the snake
def draw_snake(block_size, snake_body):
    for segment in snake_body:
        pygame.draw.rect(screen, GREEN, [segment[0], segment[1], block_size, block_size])

# Function to display the message when the game ends
def message(msg, color):
    mesg = font_style.render(msg, True, color)
    screen.blit(mesg, [SCREEN_WIDTH / 6, SCREEN_HEIGHT / 3])

# Main game loop
def gameLoop():
    game_over = False
    game_close = False

    # Starting position of the snake
    x1 = SCREEN_WIDTH / 2
    y1 = SCREEN_HEIGHT / 2

    # Movement speed
    x1_change = 0
    y1_change = 0

    # Snake body
    snake_body = []
    snake_length = 1

    # Randomly place the food
    foodx = round(random.randrange(0, SCREEN_WIDTH - BLOCK_SIZE) / 10.0) * 10.0
    foody = round(random.randrange(0, SCREEN_HEIGHT - BLOCK_SIZE) / 10.0) * 10.0

    # Game loop
    while not game_over:

        while game_close:
            screen.fill(BLUE)
            message("You Lost! Press C-Continue or Q-Quit", RED)
            display_score(snake_length - 1)
            pygame.display.update()

            # Handle key events for restarting or quitting
            for event in pygame.event.get():
                if event.type == pygame.QUIT:
                    game_over = True
                    game_close = False
                if event.type == pygame.KEYDOWN:
                    if event.key == pygame.K_q:
                        game_over = True
                        game_close = False
                    if event.key == pygame.K_c:
                        gameLoop()

        # Handling key events
        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:
                    x1_change = -BLOCK_SIZE
                    y1_change = 0
                elif event.key == pygame.K_RIGHT:
                    x1_change = BLOCK_SIZE
                    y1_change = 0
                elif event.key == pygame.K_UP:
                    y1_change = -BLOCK_SIZE
                    x1_change = 0
                elif event.key == pygame.K_DOWN:
                    y1_change = BLOCK_SIZE
                    x1_change = 0

        # Check for boundary collisions
        if x1 >= SCREEN_WIDTH or x1 < 0 or y1 >= SCREEN_HEIGHT or y1 < 0:
            game_close = True
        x1 += x1_change
        y1 += y1_change
        screen.fill(BLUE)

        # Draw the food
        pygame.draw.rect(screen, RED, [foodx, foody, BLOCK_SIZE, BLOCK_SIZE])

        # Update snake body
        snake_head = []
        snake_head.append(x1)
        snake_head.append(y1)
        snake_body.append(snake_head)
        if len(snake_body) > snake_length:
            del snake_body[0]

        # Check if the snake collides with itself
        for segment in snake_body[:-1]:
            if segment == snake_head:
                game_close = True

        draw_snake(BLOCK_SIZE, snake_body)
        display_score(snake_length - 1)

        pygame.display.update()

        # Check if snake eats the food
        if x1 == foodx and y1 == foody:
            foodx = round(random.randrange(0, SCREEN_WIDTH - BLOCK_SIZE) / 10.0) * 10.0
            foody = round(random.randrange(0, SCREEN_HEIGHT - BLOCK_SIZE) / 10.0) * 10.0
            snake_length += 1

        clock.tick(SNAKE_SPEED)

    pygame.quit()
    quit()

# Start the game
gameLoop()