from machine import Pin
from time import sleep


green = Pin(25, Pin.OUT)
yellow = Pin(26, Pin.OUT)
red = Pin(27, Pin.OUT)


enter = Pin(19, Pin.IN, Pin.PULL_UP)
exit = Pin(18, Pin.IN, Pin.PULL_UP)

cars = 0
MAX_CARS = 15

def update_leds():
    if cars <= 10:
        green.on()
        yellow.off()
        red.off()

    elif cars <= 14:
        green.off()
        yellow.on()
        red.off()

    else:
        green.off()
        yellow.off()
        red.on()

update_leds()

while True:

    
    if enter.value() == 0:
        if cars < MAX_CARS:
            cars += 1
            print("Car Entered")
            print("Cars =", cars)
        else:
            print("Parking Full!")

        update_leds()

        while enter.value() == 0:
            sleep(.01)

        sleep(0.3)

    
    if exit.value() == 0:
        if cars > 0:
            cars -= 1
            print("Car Exited")
            print("Cars =", cars)
        else:
            print("Parking Empty!")

        update_leds()

        while exit.value() == 0:
            sleep(.01)

        sleep(0.3)