# -*- coding: utf-8 -*-
# Autor: Thomas Lechner


from turtle import *
from datetime import datetime

screen = Screen()
screen.setup(800, 400)
screen.clear()
screen.register_shape("car_1.gif")

global cars, traffic
cars = []
traffic = True

def street(length, width):
    global t
    tracer(False)
    a=8
    s = Turtle()
    s.ht()
    s.pensize(8)
    s.pu();s.goto(-length/2,-width/2);s.pd()
    s.fd(length)
    s.pu();s.goto(s.xcor(),s.ycor()+width/2);s.pd()
    for i in range(a):
        s.bk(length/(2*a)-4)
        s.pu()
        s.bk(length/(2*a)+4)
        s.pd()
    s.pu();s.goto(s.xcor(),s.ycor()+width/2);s.pd()
    s.fd(length)
    t = Turtle(shape="circle")
    t.pu()
    t.goto(-250,120)
    tracer(True)

def car_start():
    tracer(False)
    car_start = Turtle(shape="car_1.gif")
    car_start.pu()
    car_start.goto(500,50)
    tracer(True)
    return car_start

def car(x,y):
    c = car_start().clone()
    cars.append(c)
    print(cars)
    
def space_check(car):
    global space
    dis = []
    a = 0
    for i in cars:
        if car != i and car.xcor() > i.xcor():
            dis.append(car.distance(i.xcor(),i.ycor()))
            print(dis)
            
    for i in dis:
        if i < 200:
            a = a+1
    if a != 0:
        space=False
        print(space)
    else:
        space=True
    return space

def trafficlight(x,y):
    global traffic
    if traffic != True:
        traffic=True
        t.color("green")
    else:
        traffic=False
        t.color("red")
    
def move(i):
    space_check(i)
    print(space)
    if cars.index(i) == 0:
        i.bk(2)
    elif space == True:
        i.bk(2)

def tick():
    screen.tracer(False)
    for i in cars:
        if traffic == True:
            move(i)
        elif i.xcor() < -200 or i.xcor() > -180:
            move(i)                    
        
        if i.xcor() < -500:
            i.ht()
            cars.remove(i)        

    screen.tracer(True)
    screen.ontimer(tick, 2)

street(800,200)
if __name__ == "__main__":
    listen()
    onscreenclick(car, 1)
    onscreenclick(trafficlight,3)
    tick()
mainloop()