from machine import Pin
import time

PASSCODE = "021"

buttons = [Pin(16, Pin.IN, Pin.PULL_DOWN),
           Pin(17, Pin.IN, Pin.PULL_DOWN), 
           Pin(18, Pin.IN, Pin.PULL_DOWN)]

switches = [Pin(28, Pin.IN, Pin.PULL_UP),
            Pin(26, Pin.IN, Pin.PULL_UP),
            Pin(27, Pin.IN, Pin.PULL_UP),
            Pin(22, Pin.IN, Pin.PULL_UP)]

leds = [Pin(7, Pin.OUT), Pin(8, Pin.OUT), Pin(9, Pin.OUT), Pin(10, Pin.OUT),
        Pin(11, Pin.OUT), Pin(12, Pin.OUT), Pin(13, Pin.OUT), Pin(14, Pin.OUT),
        Pin(15, Pin.OUT)]

pressed_buttons = []
last_click= [0, 0, 0]
interrupt = 200

def get_decimal():
    decimal_value = 0
    for i, switch in enumerate(switches):
        if switch.value() == 0:
            decimal_value += 1 << i
    return decimal_value

def button_pressed(pin):
    button_index = buttons.index(pin)
    current = time.ticks_ms()
    
    if time.ticks_diff(current, last_click[button_index]) >= interrupt:
        last_click[button_index] = current
        pressed_buttons.append(str(button_index))
        print("Button", button_index, "pressed.")  

        if len(pressed_buttons) == 3:
            if ''.join(pressed_buttons) == PASSCODE:
                decimal_value = get_decimal()
                print("Passcode correct! Switch value:", decimal_value)

                if 0 <= decimal_value <= 8:
                    leds[decimal_value].toggle()
                    print("Toggled LED at position:", decimal_value)
                else:
                    print("Passcode correct, but", decimal_value, "is out of range [0-8].")
            else:
                print("Incorrect passcode.")
            pressed_buttons.clear()

for button in buttons:
    button.irq(trigger=Pin.IRQ_RISING, handler=button_pressed)

previous_decimal = get_decimal()
print("Initial switch value:", previous_decimal)

while True:
    current_decimal = get_decimal()
    
    if current_decimal != previous_decimal:
        print("Switch changed, new decimal value:", current_decimal)
        previous_decimal = current_decimal
    
    time.sleep(0.1)