#!/usr/bin/python3
import asyncio
import signal
from contextlib import suppress
import pulsectl_asyncio
import time
import subprocess

#import pulsectl
#print('Event types:', pulsectl.PulseEventTypeEnum)
#print('Event facilities:', pulsectl.PulseEventFacilityEnum)
#print('Event masks:', pulsectl.PulseEventMaskEnum)

last_reload = 0

async def listen():
    async with pulsectl_asyncio.PulseAsync('event-printer') as pulse:
        async for event in pulse.subscribe_events('all'):
            global last_reload
            if (event.facility == "sink_input" and event.index == 20 or event.facility == "server" and event.index == -1) and event.t == "change" and time.time() - last_reload >= 2:
                last_reload = time.time()
                subprocess.call(["pacmd", ".include", "/etc/pulse/default.pa.d/10-noise-cancellation.pa"])

async def main():
    # Run listen() coroutine in task to allow cancelling it
    listen_task = asyncio.create_task(listen())

    # register signal handlers to cancel listener when program is asked to terminate
    for sig in (signal.SIGTERM, signal.SIGHUP, signal.SIGINT):
        loop.add_signal_handler(sig, listen_task.cancel)
    # Alternatively, the PulseAudio event subscription can be ended by breaking/returning from the `async for` loop

    with suppress(asyncio.CancelledError):
        await listen_task

# Run event loop until main_task finishes
loop = asyncio.get_event_loop()
loop.run_until_complete(main())