#!/usr/bin/python3

import os
import sys
import configparser
import http.client

CONF_FNAME = '.dyndns.conf'
HOSTNAME = 'edge'
DOMAIN = 'lyra.org'


def update_response(cfg):
    conn = http.client.HTTPSConnection(cfg.get('namecheap', 'host'))
    pwd = cfg.get('namecheap', 'password')
    path = (cfg.get('namecheap', 'path')
            + f'?host={HOSTNAME}&domain={DOMAIN}&password={pwd}')
    conn.request('GET', path)
    return conn.getresponse()


def main():
    if '-?' in sys.argv or '-h' in sys.argv or '--help' in sys.argv:
        print('USAGE: %s [-d] [-v]' % os.path.basename(__file__))
        print('  -d: additional debug output')
        print('  -q: quiet mode (do not print results)')
        sys.exit(0)

    cfg = configparser.ConfigParser()
    cfg.read(os.path.expanduser(f'~/{CONF_FNAME}'))

    r = update_response(cfg)
    if r.status != 200:
        print('ERROR:', r.status, r.reason)
        sys.exit(1)
    content = r.read().strip()
    print(content)
    return

    ### FROM update-freedns.py

    debug = '-d' in sys.argv
    quiet = '-q' in sys.argv

    if debug:
        print('DEBUG:', r.status, r.reason)
        print('DEBUG:', content)

    if content.startswith('Updated'):
        # Response is known. IP was updated.
        if not quiet:
            ### need to extract the IP
            print('IP updated; now:', content)
        sys.exit(0)

    if content.startswith('ERROR: Address ') \
        and content.endswith(' has not changed.'):
        # Response is known. IP was not updated.
        if not quiet:
            print('IP unchanged; still:', content[15:-17])
        sys.exit(0)

    # Unknown response.
    print('WARNING: unknown response:   (IP may have been updated)')
    print('----')
    print(content)
    print('----')
    sys.exit(1)


if __name__ == '__main__':
    main()