import 'package:web_socket_channel/web_socket_channel.dart';

class Channel {
  static Channel? _instance;
  WebSocketChannel? _channel;

  Channel._();

  factory Channel() {
    _instance ??= Channel._();
    return _instance!;
  }

  Future<WebSocketChannel> connect() async {
    if (_channel != null && _channel!.closeReason == null) {
      return _channel!;
    }
    _channel = WebSocketChannel.connect(
      Uri.parse('ws://localhost:8080/'),
    );

    await _channel!.ready;

    _channel!.stream.listen((event) {
      print(event);
    });

    _channel!.sink.add({
      "init": "INIT",
    });

    return _channel!;
  }

  static Future<Channel> send(dynamic data) async {
    final channel = Channel();

    await channel.connect();
    channel._channel!.sink.add(data);

    return channel;
  }

  static Future<Channel> init() async {
    final channel = Channel();
    await channel.connect();
    return channel;
  }
}