print("Hello, ESP32!")
from machine import Pin
import time

entry_btn = Pin(14, Pin.IN, Pin.PULL_UP)
exit_btn = Pin(27, Pin.IN, Pin.PULL_UP)

green_led = Pin(25, Pin.OUT)
red_led = Pin(26, Pin.OUT)
yellow_led = Pin(32, Pin.OUT)
blue_led = Pin(33, Pin.OUT)

car_count = 0
MAX_CARS = 15
MIN_CARS = 0

def update_leds():
    if car_count < MAX_CARS:
        green_led.value(1)
        red_led.value(0)
    else:
        green_led.value(0)
        red_led.value(1)

update_leds()
yellow_led.value(0)
blue_led.value(0)

prev_entry = entry_btn.value()
prev_exit = exit_btn.value()

while True:
    curr_entry = entry_btn.value()
    curr_exit = exit_btn.value()

    if prev_entry == 1 and curr_entry == 0:
        if car_count < MAX_CARS:
            car_count += 1
            update_leds()
            yellow_led.value(1)
            time.sleep(0.3)
            yellow_led.value(0)
        time.sleep(0.1)

    if prev_exit == 1 and curr_exit == 0:
        if car_count > MIN_CARS:
            car_count -= 1
            update_leds()
            blue_led.value(1)
            time.sleep(0.3)
            blue_led.value(0)
        time.sleep(0.1)

    prev_entry = curr_entry
    prev_exit = curr_exit
    time.sleep(0.01)