from machine import Pin
import time

# Define LED GPIO pins
led_pins = [2, 4, 5, 13, 14, 16, 17, 18]
leds = [Pin(pin, Pin.OUT) for pin in led_pins]

# Define entrance and exit buttons
entrance_button = Pin(34, Pin.IN, Pin.PULL_UP)
exit_button = Pin(35, Pin.IN, Pin.PULL_UP)

# Variables
car_count = 0  # Number of cars currently inside (0 to 8)
max_cars = 8

# Track previous button states for edge detection
prev_entrance_state = 1
prev_exit_state = 1

def update_leds():
    """Update LEDs based on current car count."""
    for i in range(len(leds)):
        leds[i].value(1 if i < car_count else 0)

def turn_off_all_leds():
    """Ensure all LEDs are off initially."""
    for led in leds:
        led.value(0)

# Initialization
print("Smart Car Monitoring System Started")
turn_off_all_leds()

# Main loop
while True:
    # Read current button states
    curr_entrance_state = entrance_button.value()
    curr_exit_state = exit_button.value()

    # Detect rising edge for entrance button (button press)
    if prev_entrance_state == 1 and curr_entrance_state == 0:
        if car_count < max_cars:
            car_count += 1
            print(f"Car entered. Current count: {car_count}")
            update_leds()
        else:
            print("Max capacity reached. No more cars allowed.")
        time.sleep(0.2)  # Debounce delay

    # Detect rising edge for exit button (button press)
    if prev_exit_state == 1 and curr_exit_state == 0:
        if car_count > 0:
            car_count -= 1
            print(f"Car exited. Current count: {car_count}")
            update_leds()
        else:
            print("No cars to exit.")
        time.sleep(0.2)  # Debounce delay

    # Update previous states
    prev_entrance_state = curr_entrance_state
    prev_exit_state = curr_exit_state

    time.sleep(0.01)  # Loop delay