import serial
import requests
import os
from dotenv import load_dotenv
import logging
import signal

load_dotenv()

##########################################
#Logging
if os.environ['logging_level'] == "DEBUG":
    loglevel = logging.DEBUG
elif os.environ['logging_level'] == "INFO":
    loglevel = logging.INFO
logger = logging.getLogger('Power Monitor')
logger.setLevel(loglevel)
#Console Handler
ch = logging.StreamHandler()
ch.setLevel(loglevel)
#Formatter
formatter = logging.Formatter('[%(asctime)s] [%(levelname)s] %(message)s')
formatter.default_msec_format = None
ch.setFormatter(formatter)
if not logger.handlers:
    logger.addHandler(ch)
##########################################

ntfy_token = os.environ['NTFY_Token']
device_name = os.environ['device_name']
shutdown_timer = int(os.environ['shutdown_timer'])

running = True

def handle_shutdown(signum, frame):
    global running
    logger.info("Received shutdown signal, exiting...")
    running = False

signal.signal(signal.SIGTERM, handle_shutdown)
signal.signal(signal.SIGINT, handle_shutdown)


def main():
    with serial.Serial(device_name, 115200, timeout=1) as ser:
        inverter_offline_counter = 0
        shutdown_triggered = False
        while running:
            line = ser.readline().decode(errors="ignore").strip()

            if line == "0":
                logger.debug("Inverter Online")
                inverter_offline_counter = 0
            elif inverter_offline_counter >= shutdown_timer:
                shutdown_triggered = True
                break
            else:
                inverter_offline_counter += 1
                logger.info(f"Running on UPS reserve, offline for {inverter_offline_counter}s")

        if shutdown_triggered:
            logger.info(f"Inverter offline for {shutdown_timer} seconds")
            try:
                requests.post(
                    "https://ntfy.fieryeagle.org/Internet-Alerts",
                    data="Inverter offline, shutting down".encode("utf-8"),
                    headers={
                        "Title": "Hydrogen running on reserve power",
                        "Authorization": f"Bearer {ntfy_token}"
                    },
                    timeout=5
                )
            except Exception as e:
                logger.error(f"Failed to send notification: {e}")
            os.system("shutdown now")
        else:
            logger.info("Exited cleanly (service stop)")

if __name__ == "__main__":
    main()