#!/usr/bin/env python3
import asyncio
import json
import logging
import signal
from typing import Callable, Coroutine

import aiofiles

from alerting import alerts
from alerting.common import CONFIG_FILE
from misc import checks, cvars

logging.basicConfig(level=logging.INFO)

stopping = False


def stop_gracefully(signum, frame):
    global stopping
    stopping = True


async def checker(check: Callable | Coroutine, interval_secs: int, *args, **kwargs):
    while True:
        logging.info(f"Calling {check.__name__}")
        if isinstance(check, Callable):
            result = check(*args, **kwargs)
            if isinstance(result, Coroutine):
                result = await result
        elif isinstance(check, Coroutine):
            result = await check
        else:
            raise TypeError(f"check is {type(check)}, neither function nor coroutine")
        logging.info(f"Got {len(result)} alerts")
        for alert in result:
            await alerts.send_alert(alert)
        await asyncio.sleep(interval_secs)


async def main():
    MINUTE = 60
    HOUR = 60 * MINUTE
    DAY = 24 * HOUR
    WEEK = 7 * DAY

    signal.signal(signal.SIGTERM, stop_gracefully)

    async with aiofiles.open(CONFIG_FILE) as f:
        contents = await f.read()
    cvars.config.set(json.loads(contents))

    client = await alerts.get_client()
    cvars.matrix_client.set(client)
    checkers = (
        checker(checks.temp_check, 5 * MINUTE),
        checker(checks.cpu_check, 5 * MINUTE),
        checker(checks.ups_check, 5 * MINUTE),
        checker(checks.ram_check, 1 * MINUTE),
        checker(checks.vuln_check, 1 * DAY),
    )
    async with asyncio.TaskGroup() as tg:
        checker_tasks: set[asyncio.Task] = set()
        for c in checkers:
            task = tg.create_task(c)
            checker_tasks.add(task)
        while True:
            if stopping:
                await client.close()
                raise SystemExit
            else:
                await asyncio.sleep(3)


if __name__ == "__main__":
    asyncio.run(main())