#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Copyright (c) 2018 Håvard Pettersson <mail@haavard.me>.
#
# This file is part of Tox-WeeChat.
#
# Tox-WeeChat is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Tox-WeeChat is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Tox-WeeChat.  If not, see <http://www.gnu.org/licenses/>.
#

import re
import sys
import os
import json
import datetime
import textwrap
import urllib.request

def iMain(surl):
    if os.path.exists(surl):
        with open(surl, 'rt') as response:
            data = json.load(response)
    else:
        with urllib.request.urlopen(surl) as response:
            data = json.load(response)

    # get online nodes that are defined by IP address
    nodes = [node for node in data['nodes']
                  if (node['status_tcp'] or node['status_udp'])
                    and re.match(r'^\d+\.\d+\.\d+\.\d+$', node['ipv4'])]

    # extract relevant values from node dictionaries
    addresses = [node['ipv4'] for node in nodes]
    ports = [node['port'] for node in nodes]
    keys = [node['public_key'] for node in nodes]
    comments = ['Maintainer: {}, location: {}'.format(
        node['maintainer'], node['location']) for node in nodes]

    # emit C code
    print('/* bootstrap nodes generated by', __file__)
    print(' * last generated', datetime.datetime.now().isoformat(), '*/')

    print('static struct t_twc_bootstrap_node const twc_bootstrap_nodes[] = {')
    for key, address, port, comment in zip(keys, addresses, ports, comments):
        print('    /* {} */'.format(comment))
        print('    {{"{}",'.format(key))
        print('     "{}", {}}},'.format(address, port))
    print('};')

    # get online nodes that are defined by IP address
    nodes = [node for node in data['nodes']
                  if (node['status_tcp'] and node['tcp_ports'])
                    and re.match(r'^\d+\.\d+\.\d+\.\d+$', node['ipv4'])]

    print('static struct t_twc_bootstrap_node const twc_bootstrap_relays[] = {')
    for node in nodes:
        for port in node['tcp_ports']:
            # extract relevant values from node dictionaries
            address = node['ipv4']
            key = node['public_key']
            comment = 'Maintainer: {}, location: {}'.format(
                node['maintainer'], node['location'])

            print('    /* {} */'.format(comment))
            print('    {{"{}",'.format(key))
            print('     "{}", {}}},'.format(address, port))
    print('};')
    return 0

if __name__ == '__main__':
    if len(sys.argv) > 1:
        surl = sys.argv[1]
    else:
        surl = 'https://nodes.tox.chat/json'
    sys.exit(iMain(surl))