import 'dart:convert';

import 'dart:io';

class HostAndPort {
  String host;
  int port;

  HostAndPort({this.host, this.port});
}

class ManageConfig {
  String listen;
}

class ProxyItemConfig {
  String listen;
  String backend;
  List<String> allowIps;
}

class ProxyConfig {
  ManageConfig managementConfig;
  List<ProxyItemConfig> tcpListens;
}

ProxyConfig parseProxyConfig(String config) {
  final jsonConfig = json.decode(config);

  final managementConfig = jsonConfig['managementConfig'];
  if (managementConfig != null) {
    final managementListen = managementConfig['listen'];
  }
  print(managementConfig);

  // print(jsonConfig);
  return null;
}

HostAndPort parseHostAndPort(String hnp) {
  final indexOfC = hnp.indexOf(":");
  if (indexOfC < 0) {
    throw 'Missing port: ' + hnp;
  }
  var host = hnp.substring(0, indexOfC);
  final port = int.parse(hnp.substring(indexOfC + 1));
  if (host.isEmpty) {
    host = '0.0.0.0';
  }
  return HostAndPort(host: host, port: port);
}

Future<ProxyConfig> loadProxyConfig(String configFile
    /*, {List<String> files} ?? */) async {
  final configFn = File(configFile);
  if (!await configFn.exists()) {
    throw 'Config file not found: ' + configFile;
  }
  return parseProxyConfig(await configFn.readAsString());
}