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

# =========================
# Buttons
# =========================
enter_button = Pin(18, Pin.IN, Pin.PULL_UP)
exit_button = Pin(19, Pin.IN, Pin.PULL_UP)

# =========================
# LEDs
# =========================
green = Pin(13, Pin.OUT)
red = Pin(26, Pin.OUT)
yellow = Pin(25, Pin.OUT)
blue = Pin(33, Pin.OUT)

# =========================
# Parking data
# =========================
cars = 0
MAX_CARS = 15

# =========================
# Initial LED state
# =========================
green.on()
red.off()
yellow.off()
blue.off()


# =========================
# Update state LEDs
# =========================
def update_state_leds():
    if cars < MAX_CARS:
        green.on()
        red.off()
    else:
        green.off()
        red.on()


# =========================
# Main program
# =========================
while True:

    # Update garage state
    update_state_leds()

    # -------------------------
    # Car Entry
    # -------------------------
    if enter_button.value() == 0:

        if cars < MAX_CARS:
            cars += 1

            # Accepted entry event
            yellow.on()
            sleep(0.2)
            yellow.off()

            print("Car entered.")
            print("Cars:", cars)

            # Update state after entry
            update_state_leds()

        # Ignore entry when garage is full
        while enter_button.value() == 0:
            sleep(0.05)

    # -------------------------
    # Car Exit
    # -------------------------
    if exit_button.value() == 0:

        if cars > 0:
            cars -= 1

            # Accepted exit event
            blue.on()
            sleep(0.2)
            blue.off()

            print("Car exited.")
            print("Cars:", cars)

            # Update state after exit
            update_state_leds()

        # Ignore exit when garage is empty
        while exit_button.value() == 0:
            sleep(0.05)

    sleep(0.05)