from machine import Pin
from time import sleep

# LEDs
Yellow = Pin(19, Pin.OUT)
Green = Pin(15, Pin.OUT)
Blue = Pin(13, Pin.OUT)
Red = Pin(12, Pin.OUT)

#Buttons
Enter_button = Pin(25, Pin.IN, Pin.PULL_DOWN)
Exit_button = Pin(26, Pin.IN, Pin.PULL_DOWN)

#Variables
Enter_last_state = 0
Exit_last_state = 0
Cars = 0
MAX_CARS = 15

def update_parking_leds():
    if Cars == MAX_CARS:
        Red.on()
        Green.off()
    else:
        Red.off()
        Green.on()


# Initial LED status
update_parking_leds()

while True:
    Enter_state = Enter_button.value()
    Exit_state = Exit_button.value()


    if Enter_state == 1 and Enter_last_state == 0 and Cars < MAX_CARS:
        sleep(0.8)
        Yellow.on()
        sleep(0.8)
        Yellow.off()
        sleep(0.8)
        Cars = Cars+1 

        update_parking_leds()

    if Exit_state == 1 and Exit_last_state == 0 and Cars > 0:
        sleep(0.8)
        Blue.on()
        sleep(0.8)
        Blue.off()
        sleep(0.8)
        Cars = Cars-1 

        update_parking_leds()

Enter_last_state = Enter_state 
sleep(0.5)    

Exit_last_state = Exit_state 
sleep(0.5)