import 'dart:async';
import 'dart:convert';
import 'dart:io';

Map<String, List<String>?> envArguments(List<String> arguments) {
  var dic = <String, List<String>?>{};
  var list = <String>[];
  var length = arguments.length;
  for (var i = 0; i < length; ++i) {
    var value = arguments[i];
    var key = _getKey(value);
    if (key != null) {
      var index = i + 1;
      list.clear();
      while (index < length) {
        var arg = arguments[index];
        if (_getKey(arg) == null) {
          list.add(arg);
          index++;
        } else {
          i = index - 1;
          break;
        }
      }
      List<String>? arr = List<String>.from(list);
      if (arr.isEmpty) arr = null;
      dic[key] = arr;
    }
  }
  return dic;
}

String? _getKey(String value) {
  String? key;
  if (value.indexOf('-') == 0) {
    key = value.substring(1, value.length);
  }
  return key;
}

Map<String, dynamic>? getMapFromJson(String jsonStr) {
  Map<String, dynamic>? map;
  if (jsonStr.length > 5) {
    JsonCodec codec = JsonCodec();
    try {
      map = codec.decode(jsonStr);
    } catch (e) {
      print("Error: $e");
    }
  }
  return map;
}

Future<String> getIPAddress(String domain) async {
  var c = Completer<String>();
  var ipAddress;
  var regEx = RegExp(r'(://)([a-zA-Z0-9-.]+)(/|:)');
  var match = regEx.firstMatch(domain);
  if (match != null && match.groupCount > 2) {
    domain = match.group(2)!;
    var list = await InternetAddress.lookup(domain);
    for (var address in list) {
      ipAddress = address.address;
      break;
    }
  }
  c.complete(ipAddress);
  return c.future;
}