# main.py for Wokwi ESP32 Simulation - SIMPLIFIED VERSION

from machine import Pin
import time

#GPIO Pin Definitions
# Define pins for the 8 LEDs
# Using a contiguous range for simplicity in this basic example
# Make sure these pins are correctly wired in your Wokwi diagram!
led_pins = [2, 4, 5, 13, 14, 16, 17, 18] # Example: Using 8 pins from the recommended list

# Define pins for the Entrance and Exit buttons
entrance_button_pin = 34
exit_button_pin = 35

# Initialize Hardware Components 
# Initialize LED pins as output
leds = []
for pin_num in led_pins:
    led = Pin(pin_num, Pin.OUT)
    leds.append(led)

# Initialize button pins as input with a pull-up resistor
# Pin.PULL_UP means the pin reads HIGH when idle and LOW when pressed (connected to GND)
entrance_button = Pin(entrance_button_pin, Pin.IN, Pin.PULL_UP)
exit_button = Pin(exit_button_pin, Pin.IN, Pin.PULL_UP)

# Global Variables
car_count = 0  # Current number of cars inside the office
MAX_CARS = 8   # Maximum allowed cars
MIN_CARS = 0   # Minimum allowed cars

# Function to update LEDs
def update_leds():
    """
    Updates the state of the LEDs based on the current car_count.
    """
    for i in range(MAX_CARS):
        if i < car_count:
            leds[i].value(1)  # Turn LED ON
        else:
            leds[i].value(0)  # Turn LED OFF

# Main Loop
print("Simplified Monitoring System Started. Ready for button presses.")
update_leds() # Ensure all LEDs are off initially

# Keep track of the last button state to detect presses (simple debounce)
last_entrance_state = entrance_button.value()
last_exit_state = exit_button.value()

while True:
    current_entrance_state = entrance_button.value()
    current_exit_state = exit_button.value()

    # Check for Entrance Button Press (button goes from HIGH to LOW)
    if current_entrance_state == 0 and last_entrance_state == 1:
        if car_count < MAX_CARS:
            car_count += 1
            print(f"Car entered. Current cars: {car_count}")
            update_leds()
        else:
            print("Office is full. Cannot enter.")

    # Check for Exit Button Press (button goes from HIGH to LOW)
    if current_exit_state == 0 and last_exit_state == 1:
        if car_count > MIN_CARS:
            car_count -= 1
            print(f"Car exited. Current cars: {car_count}")
            update_leds()
        else:
            print("Office is empty. Cannot exit.")

    # Update last states for next iteration
    last_entrance_state = current_entrance_state
    last_exit_state = current_exit_state

    time.sleep(0.05) # A small delay to save CPU cycles and for basic debounce