#!/usr/bin/env python3

import time

import automationhat

import sys

import queue

import threading

def main():

    command_queue = queue.LifoQueue()

    read_thread = threading.Thread(target=read_loop, args=[command_queue])

    read_thread.start()

    run_loop(command_queue)

def read_loop(command_queue):

    while True:

        command_queue.put_nowait(sys.stdin.readline().rstrip('\n'))

def run_loop(command_queue):

    thread_local = threading.local()

    thread_local.doorbell_on_state = False

    while True:

        run_command(command_queue)

        read_doorbell(thread_local)

def run_command(command_queue):

    try:

        command = command_queue.get(timeout=0.5)

    except queue.Empty:

        pass

    else:

        automationhat.relay.on() if command == "unlock" else automationhat.relay.off()

def read_doorbell(thread_local):

    analog_value = automationhat.analog.one.read()

    if doorbell_on_state != thread_local.doorbell_on_state:

        thread_local.doorbell_on_state = doorbell_on_state

        print("doorbell on") if doorbell_on_state else print("doorbell off")

if __name__ == "__main__":

    main()