from machine import Pin
import time

LED_PINS = [2, 4, 5, 13, 14, 16, 17, 18] 
NUM_LEDS = len(LED_PINS) 
GREEN_BUTTON_PIN = 35 # Entrance Button
RED_BUTTON_PIN = 34   # Exit Button

current_car_count = 0

DEBOUNCE_DELAY_MS = 30 
DEBOUNCE_DELAY_TICKS = DEBOUNCE_DELAY_MS

entrance_button_state = 1 
last_entrance_button_state = 1
last_entrance_debounce_time = 0

exit_button_state = 1 
last_exit_button_state = 1
last_exit_debounce_time = 0

led_objects = []
for pin_num in LED_PINS:
    led = Pin(pin_num, Pin.OUT) 
    led.value(0) 
    led_objects.append(led)

entrance_button = Pin(GREEN_BUTTON_PIN, Pin.IN, Pin.PULL_UP)
exit_button = Pin(RED_BUTTON_PIN, Pin.IN, Pin.PULL_UP)


def update_leds(count):
    for i in range(NUM_LEDS): 
        if i < count:
            led_objects[i].value(1) 
        else:
            led_objects[i].value(0) 


print("ESP32 LED Control for Car Parking (MicroPython)...")
print(f"Initial Car Count: {current_car_count}")
update_leds(current_car_count) 

while True:
      reading_entrance = entrance_button.value()
    
    if reading_entrance != last_entrance_button_state:
        last_entrance_debounce_time = time.ticks_ms()

      if time.ticks_diff(time.ticks_ms(), last_entrance_debounce_time) > DEBOUNCE_DELAY_TICKS:
        if reading_entrance != entrance_button_state:
            entrance_button_state = reading_entrance

            if entrance_button_state == 0: 
                if current_car_count < NUM_LEDS: 
                    current_car_count += 1 
                    update_leds(current_car_count) 
                    print(f"Car entered. Current Car Count: {current_car_count}")
                else:
                    print(f"Parking full! Current Car Count: {current_car_count}")
    last_entrance_button_state = reading_entrance 


    reading_exit = exit_button.value()

    if reading_exit != last_exit_button_state:
        last_exit_debounce_time = time.ticks_ms()

    if time.ticks_diff(time.ticks_ms(), last_exit_debounce_time) > DEBOUNCE_DELAY_TICKS:
        if reading_exit != exit_button_state:
            exit_button_state = reading_exit

            if exit_button_state == 0: 
                
                if current_car_count > 0:
                    current_car_count -= 1 
                    update_leds(current_car_count) 
                    print(f"Car exited. Current Car Count: {current_car_count}")
                else:
                    print(f"Parking empty! Current Car Count: {current_car_count}")
    last_exit_button_state = reading_exit 
    time.sleep_ms(10)