import machine
from utime import sleep, ticks_ms

s0 = machine.Pin(27, machine.Pin.OUT)
s1 = machine.Pin(28, machine.Pin.OUT)

mux_out = machine.Pin(26, machine.Pin.IN, machine.Pin.PULL_DOWN)

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

led_pins = [machine.Pin(i, machine.Pin.OUT) for i in range(13, 22)]

PASSCODE = [2, 1, 0]
pressed_buttons = []
debounce_time = 200
last_press_time = [0, 0, 0]

def read_mux():
    binary_value = 0
    for selector_val in range(4):
        s0.value(selector_val & 1)
        s1.value((selector_val >> 1) & 1)
        sleep(0.001)
        binary_value |= (mux_out.value() << selector_val)
    return binary_value

def button_pressed(pin):
    global pressed_buttons
    button_index = button_pins.index(pin)
    current_time = ticks_ms()

    if current_time - last_press_time[button_index] < debounce_time:
        return

    last_press_time[button_index] = current_time
    pressed_buttons.append(button_index)

    if len(pressed_buttons) > 3:
        pressed_buttons.pop(0)

    print(f"Button {button_index} pressed. Current sequence: {pressed_buttons}")

    if len(pressed_buttons) == 3:
        validate_passcode()

def validate_passcode():
    global pressed_buttons
    decimal_value = read_mux()

    if pressed_buttons == PASSCODE:
        if 0 <= decimal_value <= 8:
            led_pins[decimal_value].value(not led_pins[decimal_value].value())
            print(f"✅ Correct passcode entered! Toggling LED {decimal_value}")
        else:
            print(f"❌ Decimal number {decimal_value} is out of range! Expected [0-8].")
    else:
        print(f"❌ Incorrect passcode! Entered: [1, 0, 2]. Expected: {PASSCODE}")

    pressed_buttons = []

for btn in button_pins:
    btn.irq(trigger=machine.Pin.IRQ_RISING, handler=button_pressed)

def main():
    print(" Waiting for input...")
    
    prev_value = -1
    while True:
        decimal_value = read_mux()
        if decimal_value != prev_value:
            print(f"Decimal representation: {decimal_value}")
            prev_value = decimal_value
        sleep(0.1)

if __name__ == "__main__":
    main()