from machine import Pin, ADC
import time
from math import log
from utime import sleep

## Pin interrupt handler
#
# A function to handle pin interrupts
# Expects a Pin type parameter
button_pressed = False
def interrupt_callback(pin):
    global button_pressed
    stamp = 0.5
    pressed_time = time.ticks_ms() - stamp
    if pressed_time > 199.5:
        button_pressed = True
        stamp = pressed_time


def main():
  global button_pressed
  global stamp
  global counter
  # a tiny sleep to allow the first print to be displayed
  b0 = Pin(2, Pin.IN, Pin.PULL_DOWN)
  b1 = Pin(1, Pin.IN, Pin.PULL_DOWN)
  b2 = Pin(0, Pin.IN, Pin.PULL_DOWN)
  led1 = Pin(16, Pin.OUT)
  led2 = Pin(17, Pin.OUT)
  led3 = Pin(18, Pin.OUT)
  led4 = Pin(19, Pin.OUT)
  ntc = ADC(Pin(26))
  ldr = ADC(Pin(27))
  pir = Pin(15, Pin.IN)
  mq2 = ADC(Pin(28))

  input_passcode = []
  correct_passcode = [2, 2, 0]
  ntc_beta = 3950
  ldr_gamma = 0.7
  ldr_rl10 = 50

  print('Program starting')

  # code below here
  while True:
    # Pin Interrupt Handlers
    b0.irq(trigger=Pin.IRQ_RISING, handler=interrupt_callback)
    b1.irq(trigger=Pin.IRQ_RISING, handler=interrupt_callback)
    b2.irq(trigger=Pin.IRQ_RISING, handler=interrupt_callback)
    x = 0
    y = 1
    z = 2

    sleep(0.01)
    if button_pressed == True:
      if b0.value():
        print(f"Key {x} is pressed")
        sleep(1)
        input_passcode.append(x)
        button_pressed = False
      if b1.value():
        print(f"Key {y} is pressed")
        sleep(1)
        input_passcode.append(y)
        button_pressed = False
      if b2.value():
        print(f"Key {z} is pressed")
        sleep(1)
        input_passcode.append(z)
        button_pressed = False

    # Temperature from NTC {Degree Symbol "°"}
    celsius = 1 / (log(1 / (65535. / ntc.read_u16() - 1)) / ntc_beta + 1.0 / 298.15) - 273.15

    # Light from LDR
    voltage = ldr.read_u16() / 65535. * 5
    resistance = 2000 * voltage / (1 - voltage / 5)
    lux = pow(ldr_rl10 * 1e3 * pow(10, ldr_gamma) / resistance, (1 / ldr_gamma))

    # Motion from PIR
    motion = pir.value()

    # Gas from MQ2
    gas = mq2.read_u16()

    # If password is entered correctly then display accurate information of the sensors
    if len(input_passcode) == len(correct_passcode):
        if input_passcode == correct_passcode:
            print("Access Granted")
            print("")
            sleep(0.5)
            print(f"Temperature: {round(celsius, 1)}°C")
            print("State: Night" if lux < 400 else "State: Day")
            print("Door Motion: Detected!" if motion else "Door Motion: Ended")
            print("Smoke: Detected!" if gas > 58654 else "Smoke: 0")
            input_passcode = []
        else:
            print("Access Denied")
            sleep(0.2)
            print("Please enter the correct passcode")
            input_passcode = []
        if len(input_passcode) > len(correct_passcode):
            if len(input_passcode) == 4:
                subset = input_passcode[:3]
                subset2 = input_passcode[4]
                if subset != correct_passcode:
                    print("You entered the wrong passcode")
                    sleep(0.5)
                    print("However make sure to write 2 more digits")
                    input_passcode = []
                    input_passcode.append(subset2)
            elif len(input_passcode) == 5:
                subset = input_passcode[:3]
                subset2 = input_passcode[4]
                subset3 = input_passcode[5]
                if subset != correct_passcode:
                    print("You entered the wrong passcode")
                    sleep(0.5)
                    print("However make sure to write 1 more digit")
                    input_passcode = []
                    input_passcode.append(subset2)
                    input_passcode.append(subset3)
                if len(input_passcode) == len(correct_passcode):
                    if input_passcode == correct_passcode:
                        print("Access Granted")
                        print("")
                        sleep(0.5)
                        print(f"Temperature: {round(celsius, 1)}°C")
                        print("State: Night" if lux < 400 else "State: Day")
                        print("Door Motion: Detected!" if motion else "Door Motion: Ended")
                        print("Smoke: Detected!" if gas > 58654 else "Smoke: 0")
                        input_passcode = []
                    else:
                        print("Access Denied")
                        sleep(0.2)
                        print("Please enter the correct passcode")
                        input_passcode = []

    
    led1.value(1 if round(celsius, 1) > 30 else 0)
    led2.value(1 if lux < 400 else 0)
    led3.value(1 if motion else 0)
    led4.value(1 if gas > 58654 else 0)

if __name__ == "__main__":
    main()