import machine, time

time_last_pressed = 0
mux_input = machine.Pin(12, machine.Pin.IN, machine.Pin.PULL_DOWN)
selector_a = machine.Pin(13, machine.Pin.OUT)
selector_b = machine.Pin(14, machine.Pin.OUT)

buttons = [machine.Pin(2 + i, machine.Pin.OUT, machine.Pin.PULL_DOWN) for i in range(3)]
access_code = [buttons[0], buttons[2], buttons[1]]
input_sequence = []
status_indicators = [machine.Pin(16 + i, machine.Pin.OUT) for i in range(9)]

def button_interrupt_handler(pin):
    global time_last_pressed
    if time.ticks_diff(time.ticks_ms(), time_last_pressed) > 200:
        time_last_pressed = time.ticks_ms()
        input_sequence.append(pin)
        print(f'Button Pressed: {buttons.index(pin)}')

def system_control():
    global input_sequence, access_code
    event_watchers = [btn.irq(trigger=machine.Pin.IRQ_FALLING, handler=button_interrupt_handler) for btn in buttons]
    last_state = -1
    
    while True:
        signal_value = 0
        for selection in range(4):
            selector_a.value((selection >> 0) & 1)
            selector_b.value((selection >> 1) & 1)
            time.sleep_us(5)  # Allow signal stabilization
            signal_value |= (mux_input.value() << selection)
        
        if last_state != signal_value:
            print(f"Decoded Value: {signal_value}\n")
            last_state = signal_value
        
        time.sleep(0.1)
        
        if len(input_sequence) >= len(access_code):
            if input_sequence == access_code:
                if signal_value > 8:
                    print("Access Granted: Invalid Range (Valid: 0-8)")
                else:
                    print(f"\nLED {signal_value}")
                    status_indicators[signal_value].toggle()
                    print(f"✨ Success! You're In.\nSequence: {[buttons.index(x) for x in input_sequence]}")
            else:
                print(f"⛔ Nope! That's not the right code.\nSequence: {[buttons.index(x) for x in input_sequence]}")
            
            input_sequence = input_sequence[len(access_code):]

if __name__ == "__main__":
    system_control()