import machine
import time
from utime import sleep
time.sleep(0.1)

button_pin = machine.Pin(16,machine.Pin.IN,machine.Pin.PULL_DOWN)
button2_pin = machine.Pin(17,machine.Pin.IN,machine.Pin.PULL_DOWN)
button3_pin = machine.Pin(18,machine.Pin.IN,machine.Pin.PULL_DOWN)

button_pressed = False

last_button_time_stamp = 0
button_pressed = False
pressed_button_id = -1

object_pin_dict = {button_pin: 2  , button2_pin: 1 ,button3_pin: 0 }

s0 = machine.Pin(27,machine.Pin.OUT)
s1 = machine.Pin(28,machine.Pin.OUT)
mux_in = machine.Pin(26,machine.Pin.IN)


led_start_Pin= 7
num_leds = 9

def PinId(pin):
    return int (str(pin)[8:11].rstrip(","))

def interrupt_callback(pin):
    global last_button_time_stamp
    global button_pressed
    global pressed_button_id
    cur_button_ts = time.ticks_ms()
    button_press_delta = cur_button_ts - last_button_time_stamp
    if button_press_delta > 200:
        last_button_time_stamp = cur_button_ts
        button_pressed = True
        pressed_button_id = object_pin_dict[pin]
def read_switches():
    binary_value = 0
    selectors = [(0,0),(0,1),(1,0),(1,1)]
    for selector_value in range(4):
        s0.value(selectors[selector_value][0])
        s1.value(selectors[selector_value][1])
        binary_value += 2**selector_value*mux_in.value()
    print (binary_value)
    return binary_value
input_list = []
def timer_callback(t):
    global input_list
    if len(input_list)>0:
        print('timer Triggered ,wrong password')
    input_list.clear()
password =[2,0,1]  

def main():
    led_objects = []
    for i in range(num_leds):
        led = machine.Pin(led_start_Pin + i,machine.Pin.OUT)
        led_objects.append(led)
    input_list =[]
    global button_pressed
    global pressed_button_id

    button_pin.irq(trigger = machine.Pin.IRQ_RISING,handler =interrupt_callback)
    button2_pin.irq(trigger = machine.Pin.IRQ_RISING,handler =interrupt_callback)
    button3_pin.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
        if len(input_list) == 3:
            if input_list == password:
                print ('Enetred correct password ')
                switch_val =read_switches()
                if switch_val < num_leds:
                    led_objects[switch_val].toggle()
            else:
                print ('wrong password')
            input_list.clear()
       
if __name__ == '__main__':
    main()
    # adpted from classroom(udacity)