import machine
import time
from utime import sleep

## Pin interrupt handler
######################## The password is 201
# A function to handle pin interrupts
# Expects a machine.Pin type parameter
def interrupt_callback(pin):
    global last_button_time_stamp, button_pressed, pressed_button_id
    cur_button_ts = time.ticks_ms()
    if cur_button_ts - last_button_time_stamp > DEBOUNCE_TIME:
        last_button_time_stamp = cur_button_ts
        button_pressed = True
        pressed_button_id = buttons[pin]

def main():
    sleep(0.01)
    print('Program starting')
    print('Hello try turning any one of the switches and then write the password on the toggle buttons the right one then the left one then the middle one [the pw order]')



PASSWORD = [2, 0, 1]
BUTTON_PINS = [16, 17, 18]
MUX_SELECT_PINS = [27, 28]
MUX_INPUT_PIN = 26
LED_START_PIN = 7
NUM_LEDS = 9
DEBOUNCE_TIME = 200  

button_pressed = False
pressed_button_id = -1
last_button_time_stamp = 0
input_list = []


buttons = {machine.Pin(pin, machine.Pin.IN, machine.Pin.PULL_DOWN): idx for idx, pin in enumerate(BUTTON_PINS)}


s0, s1 = [machine.Pin(pin, machine.Pin.OUT) for pin in MUX_SELECT_PINS]
mux_in = machine.Pin(MUX_INPUT_PIN, machine.Pin.IN)


leds = [machine.Pin(LED_START_PIN + i, machine.Pin.OUT) for i in range(NUM_LEDS)]


def read_switches():
    binary_value = 0
    
    for selector_value in range(4):
        s0.value(selector_value % 2)
        s1.value(selector_value // 2)
        
        binary_value += (2 ** selector_value) * mux_in.value()
    return binary_value


def reset_timer(t):
    global input_list
    if input_list:
        print("Timer Triggered: Wrong password")
    input_list.clear()


def password201():
    global button_pressed, pressed_button_id

    last_binary_value = -1  
    for button in buttons:
        button.irq(trigger=machine.Pin.IRQ_RISING, handler=interrupt_callback)
    
    while True:
       
        if button_pressed:
            print("Key Pressed:", pressed_button_id)
            input_list.append(pressed_button_id)
            button_pressed = False
            pressed_button_id = -1

        
        switch_val = read_switches()
        if switch_val != last_binary_value:
            print("Switch Value:", switch_val)
            last_binary_value = switch_val

        
        if len(input_list) == len(PASSWORD):
            if input_list == PASSWORD:
                print("Entered Correct Password")
                if 0 <= switch_val < NUM_LEDS:
                    leds[switch_val].toggle()
                    print("Switch Value:", switch_val)
                else:
                    print("Invalid Input: ", switch_val, ", valid range: 0-8, doing nothing")
            else:
                print("Wrong Password")
                
            input_list.clear()

        
        time.sleep(0.05)


if __name__ == '__main__':
    main()

if __name__ == "__main__":
    password201()