if head.direction == "down":
    y = head.ycor()
    head.sety(y - 20)

if head.direction == "left":
    x = head.xcor()
    head.setx(x - 20)

if head.direction == "right":
    x = head.xcor()
    head.setx(x + 20)

# Check for a collision with the border
if head.xcor()>290 or head.xcor()<-290 or head.ycor()>290 or head.ycor()<-290:
    time.sleep(1)
    head.goto(0,0)
    head.direction = "stop"

    # Hide the segments
    for segment in segments:
        segment.goto(1000, 1000)
    
    # Clear the segments list
    segments.clear()

    # Reset the score
    score = 0

    # Reset the delay
    delay = 0.1

    pen.clear()
    pen.write("Score: {}  High Score: {}".format(score, high_score), align="center", font=("Courier", 24, "normal")) 


# Check for a collision with the food
if head.distance(food) < 20:
    # Move the food to a random spot
    x = random.randint(-290, 290)
    y = random.randint(-290, 290)
    food.goto(x,y)

    # Add a segment
    new_segment = turtle.Turtle()
    new_segment.speed(0)
    new_segment.shape("square")
    new_segment.color("grey")
    new_segment.penup()
    segments.append(new_segment)

    # Shorten the delay
    delay -= 0.001

    # Increase the score
    score += 10

    if score > high_score:
        high_score = score
    
    pen.clear()
    pen.write("Score: {}  High Score: {}".format(score, high_score), align="center", font=("Courier", 24, "normal")) 

# Move the end segments first in reverse order
for index in range(len(segments)-1, 0, -1):
    x = segments[index-1].xcor()
    y = segments[index-1].ycor()
    segments[index].goto(x, y)

# Move segment 0 to where the head is
if len(segments) > 0:
    x = head.xcor()
    y = head.ycor()
    segments[0].goto(x,y)

move()    

# Check for head collision with the body segments
for segment in segments:
    if segment.distance(head) < 20:
        time.sleep(1)
        head.goto(0,0)
        head.direction = "stop"
    
        # Hide the segments
        for segment in segments:
            segment.goto(1000, 1000)
    
        # Clear the segments list
        segments.clear()

        # Reset the score
        score = 0

        # Reset the delay
        delay = 0.1
    
        # Update the score display
        pen.clear()
        pen.write("Score: {}  High Score: {}".format(score, high_score), align="center", font=("Courier", 24, "normal"))

time.sleep(delay)