import machine
import time
from utime import sleep

# Define pins for selectors and buttons
selector_pins = [27, 28]
button_pins = [16, 17, 18]

# Initialize selector pins
selectors = [machine.Pin(pin, machine.Pin.OUT) for pin in selector_pins]
mux_in = machine.Pin(26, machine.Pin.IN)
# Initialize button pins
buttons = [machine.Pin(pin, machine.Pin.IN, machine.Pin.PULL_DOWN) for pin in button_pins]

# Dictionary to map button objects to their numeric IDs
btns_numeric_dict = {buttons[0]: 0, buttons[1]: 1, buttons[2]: 2}

# Pin interrupt handler function
def interrupt_callback(pin):
    global bounce_time
    global pressed_btns
    global last_btn_pressed_time
    current_time = time.ticks_ms()
    if current_time - last_btn_pressed_time > bounce_time:
        last_btn_pressed_time = current_time
        print(f"Pressed Button Numeric ID: Button {btns_numeric_dict[pin]}")
        pressed_btns.append(btns_numeric_dict[pin])

# Function to decode the binary value from selectors
def decoding():
    binary_code = 0
    for selector_val in range(4):
        selectors[0].value(selector_val % 2)
        selectors[1].value(selector_val // 2)
        sleep(0.020)
        binary_code += (pow(2, selector_val) * mux_in.value())
    return binary_code

# Main function
def main():
    global binary_num
    global pressed_btns
    global last_btn_pressed_time
    global bounce_time

    # Initialize variables
    bounce_time = 200
    last_btn_pressed_time = -1
    pressed_btns = []

    # Initial message
    print('Program starting')

    # Decode initial value
    binary_num = decoding()
    print(f"The Current Decimal Number From Switches is: {binary_num}")

    # Assign interrupt handlers to buttons
    for button in buttons:
        button.irq(trigger=machine.Pin.IRQ_RISING, handler=interrupt_callback)

    # Password for LED toggling
    password = [0, 2, 1]

    # Initialize LED pins
    led_count = 9
    led_start = 7
    led_pins = range(led_start, led_start + led_count)
    leds = [machine.Pin(pin, machine.Pin.OUT) for pin in led_pins]

    while True:
        if binary_num != decoding():
            binary_num = decoding()
            print(f"The Current Decimal Number From Switches is: {binary_num}")

        if len(pressed_btns) == len(password):
            if pressed_btns == password:
                led_id = decoding()
                if led_id < led_count:
                    leds[led_id].toggle()
                    print(f"Now the led {led_id } is toggled.")
                else:
                    print("Out Of Range, Please make sure that you are in range between [0, 8]")
            else:
                print("Incorrect Password, Please Try again")
            pressed_btns = []

if __name__ == "__main__":
    main()