#!/usr/bin/env python3
import logging
import subprocess
import sys
import time
from pathlib import Path


def find_file_arg(argv: list[str]) -> Path:
    for it in argv:
        if it.startswith('-'):
            continue
        if Path(it).is_file():
            return Path(it)


def main():
    argv = sys.argv[1:]
    file_path = find_file_arg(argv)
    if not file_path:
        logging.error('file argument not passed')
        return

    size = file_path.stat().st_size
    while True:
        args = ['rsync', '--recursive', '--human-readable', '--progress', '--partial', *argv]
        logging.debug(f'running rsync with {args=}')
        p = subprocess.run(args)
        p.check_returncode()

        logging.debug('will check the file size in 20s')
        time.sleep(20)
        subprocess.run(['touch', str(file_path)])

        new_size = file_path.stat().st_size

        if new_size == size:
            logging.info('file size has not changed, stopping')
            break
        logging.info(f'file size has changed {new_size - size} bytes, re-syncing')
        size = new_size


if __name__ == '__main__':
    logging.basicConfig(level=logging.INFO)
    main()