from machine import Pin
import time

# Inputs
btn_entry = Pin(33, Pin.IN, Pin.PULL_DOWN)
btn_exit = Pin(13, Pin.IN, Pin.PULL_DOWN)

# Outputs
led_green = Pin(21, Pin.OUT)
led_red = Pin(2, Pin.OUT)
led_yellow = Pin(16, Pin.OUT)
led_blue = Pin(0, Pin.OUT)

cars = 0

# Led Status
led_green.value(1)
led_red.value(0)
led_yellow.value(0)
led_blue.value(0)

print("System Loaded! Cars Count:", cars)

while True:
    # Entry Button (Top Button)
    if btn_entry.value() == 1:
        if cars < 15:
            cars = cars + 1
            print("Car Entered. Count:", cars)

            # Update State LEDs Status First
            if cars == 15:
                led_green.value(0)
                led_red.value(1)
            else:
                led_green.value(1)
                led_red.value(0)

            # Blink Yellow Event LED
            led_yellow.value(1)
            time.sleep(0.2)
            led_yellow.value(0)

            time.sleep(0.3)
        else:
            print("Garage Is Already Full! Entry Is ignored.")
            time.sleep(0.3)
            
            # Exit Button (Bottom Button)
    if btn_exit.value() == 1:
        if cars > 0:
            cars = cars - 1
            print("Car Exited. Count:", cars)

            # Update State LEDs Status First
            if cars == 15:
                led_green.value(0)
                led_red.value(1)
            else:
                led_green.value(1)
                led_red.value(0)

            # Blink Blue Event LED
            led_blue.value(1)
            time.sleep(0.2)
            led_blue.value(0)

            time.sleep(0.3)
        else:
            print("Garage Is Already Empty! Exit Is ignored.")
            time.sleep(0.3)

    time.sleep(0.05)