import argparse
import logging
from time import sleep

import requests as r


logger = logging.getLogger(__name__)

arg_parser = argparse.ArgumentParser()
arg_parser.add_argument("-a", "--auth", default="", help="Path to auth file.")
arg_parser.add_argument("-l", "--log", default="", help="Log to file instead of stdout")
args = arg_parser.parse_args()

MINUTE_SEC: int = 60
HOUR_SEC: int = MINUTE_SEC * 60
DAY_SEC: int = HOUR_SEC * 24
SLEEP_TIME_SEC: int = DAY_SEC * 5 + HOUR_SEC * 3 + MINUTE_SEC * 14


def dyfi_update(email: str, password: str, hostnames: str) -> None:
    res: r.Response = r.get("https://www.dy.fi/nic/update", params={"hostname": hostnames}, auth=(email, password))
    if res.status_code != 200:
        logger.error("dy.fi responded with code {res.status_code}. Response content:\n{res.text}\n")
    else:
        logger.info(f"dy.fi responded with 200. Response content: \n{res.text}\n")


def parse_auth() -> tuple[str, str, str]:
    with open(args.auth, "r") as f:
        lines: list[str] = f.readlines()
        email_start: int = lines[0].find("EMAIL=")
        if email_start == -1:
            logger.error("Invalid auth file. Email not found. Must be in the format:\nEMAIL=<email>\nPASSWORD=<password>\nHOSTNAMES=<hostnames>")

        email_start += len("EMAIL=")
        email = lines[0][email_start:-1]

        password_start: int = lines[1].find("PASSWORD=")
        if password_start == -1:
            logger.error("Invalid auth file. Password not found. Must be in the format:\nEMAIL=<password>\nPASSWORD=<password>\nHOSTNAMES=<hostnames>")

        password_start += len("PASSWORD=")
        password = lines[1][password_start:-1]

        hostnames_start: int = lines[2].find("HOSTNAMES=")
        if hostnames_start == -1:
            logger.error("Invalid auth file. Hostnames not found. Must be in the format:\nEMAIL=<hostnames>\nPASSWORD=<hostnames>\nHOSTNAMES=<hostnames>")

        hostnames_start += len("HOSTNAMES=")
        hostnames = lines[2][hostnames_start:-1]

        return (email, password, hostnames)
    

if __name__ == "__main__":
    logging.basicConfig(filename=args.log, level=logging.INFO, format="(%(asctime)s) %(levelname)s: %(message)s")

    if args.auth == "":
        logger.error("Must provide a path to an auth file.")
        exit(1)

    email, password, hostnames = parse_auth()

    while True:
        dyfi_update(email, password, hostnames)
        logger.info(f"Sleeping for {SLEEP_TIME_SEC} seconds")
        sleep(SLEEP_TIME_SEC)