import turtle
import time
import random

delay = 0.1

#score
score=0
high_score=0

#set up the screen
wn= turtle.Screen()
wn.title("Snake Game by @bilal")
wn.bgcolor("green")
wn.setup(width=600, height=600)
wn.tracer(0)#turn of the screen update

#Snake head
head = turtle.Turtle()
head.speed(0)#
head.shape("square")
head.color("black")
head.penup()
head.goto(0,0)
head.direction ="stop"

#snake food

food = turtle.Turtle()
food.speed(0)
food.shape('circle')
food.color("red")
food.penup()
food.goto(0,100)

segments=[]

#pen
pen=turtle.Turtle()
pen.speed(0)
pen.shape("square")
pen.color("white")
pen.penup()
pen.hideturtle()
pen.goto(0,260)
pen.write("score: 0 high score: 0:",align="center",font=("courier",24,"normal"))
#Function of Directions
def go_up():
    if head.direction !="down":
        head.direction = "up"
    
def go_down():
    if head.direction !="up":
        head.direction = "down"
    
def go_left():
     if head.direction !="right":
        head.direction = "left"
    
def go_right():
     if head.direction !="left":
         head.direction = "right"


#Directions
def move():
    if head.direction == "up":
        y = head.ycor()
        head.sety(y + 20)
    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)

#Keyboard functions
wn.listen()
wn.onkeypress(go_up, "w")
wn.onkeypress(go_down, "s")
wn.onkeypress(go_left, "a")
wn.onkeypress(go_right, "d")

    
#Main loop
while True:
    wn.update()
    #check for collition 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"
        
    #check for a collition with the food
    if head.distance(food)<20:
        #move the food to the random spot
        x=random.randint(-290,290)
        y=random.randint(-290,290)
        food.goto(x,y)
        # add a asgment
        new_segment=turtle.Turtle()
        new_segment.speed(0)
        new_segment.shape("square")
        new_segment.color("black")
        new_segment.penup()
        segments.append(new_segment)

        # increase the score
        delay -=0.001
        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()
            
            #REST the score
            score=0
            #update the score display
            pen.clear()
        pen.write("score:{} high score:{}".format(score,high_score),align="center",font=("courier",24,"normal"))


    
    time.sleep(delay)

window.mainloop()