#!/usr/bin/python3
# -*- mode: python -*-
# SPDX-License-Identifier: AGPL-3.0-or-later
"""
GnuDIP client for updating Dynamic DNS records.
"""

import argparse
import logging
import pathlib
import sys

from plinth.modules.dynamicdns import gnudip

logger = logging.getLogger(__name__)

CONFIG_FILE = pathlib.Path('/etc/ez-ipupdate/ez-ipupdate.conf')


def parse_arguments():
    """Return parsed command line arguments as dictionary."""
    parser = argparse.ArgumentParser()
    subparsers = parser.add_subparsers(dest='subcommand', help='Sub command')

    subparsers.add_parser('update', help='Update Dynamic DNS record')

    subparsers.required = True
    return parser.parse_args()


def subcommand_update(_):
    """Update Dynamic DNS record.

    Uses settings from ez-ipupdate config file.
    """
    if not CONFIG_FILE.is_file():
        logger.info('GnuDIP configuration not found.')
        return

    config = {}
    with CONFIG_FILE.open() as cf:
        lines = cf.readlines()
        for line in lines:
            if '=' in line:
                items = line.split('=')
                key = items[0].strip()
                value = items[1].strip()
            else:
                key = line.strip()
                value = True

            config[key] = value

    if not all(['host' in config, 'server' in config, 'user' in config]):
        logger.warn('GnuDIP configuration is not complete.')
        return

    username, password = config['user'].split(':')
    result, new_ip = gnudip.update(config['server'], config['host'], username,
                                   password)
    if result == 0 and new_ip:
        print(new_ip)

    return result


def main():
    """Parse arguments and perform all duties."""
    arguments = parse_arguments()

    subcommand = arguments.subcommand.replace('-', '_')
    subcommand_method = globals()['subcommand_' + subcommand]
    sys.exit(subcommand_method(arguments))


if __name__ == '__main__':
    main()