#!./venv/bin/python3

# This script clears expired sessions in a regular interval

import os

from argparse import ArgumentParser
from atexit import register as register_exithandler
from pathlib import Path
from subprocess import Popen
from time import sleep
from datetime import datetime


current_proc = None


def exithandler():
    if current_proc is not None:
        seconds_waited = 0
        while current_proc.poll() is None:
            # wait for 10 seconds to quit session cleaner
            if seconds_waited >= 10:
                current_proc.terminate()
                break
            # is still running
            sleep(1)
            seconds_waited += 1
    print("Stopped session-autocleaner.")


if __name__ == "__main__":
    try:
        argp = ArgumentParser()
        argp.add_argument("interval", help="The interval in minutes", type=int)
        args = argp.parse_args()
        os.chdir(str(Path(__file__).parent.parent))
        print(f"Started session-autocleaner with an interval of {args.interval} minute(s)")
        interval = args.interval * 60
        # register exithandler that cleans up stuff
        register_exithandler(exithandler)
        # main loop
        while True:
            if current_proc is not None:
                # wait for last iteration
                while current_proc.poll() is None:
                    # is still running
                    print("Last cleanup is still running, waiting before clearing sessions...")
                    sleep(1)
            print(f"Clearing expired sessions at {datetime.now()}...")
            current_proc = Popen(
                ["./manage.py", "clearsessions"])
            sleep(interval)
    except KeyboardInterrupt:
        exit()