flutter_appfx/lib/network/websocketServerWrap.dart

import 'dart:async';
import 'dart:io';
// import '../util/logger.dart';


enum WebsocketServerStatus {
  starting,
  started,
  stopping,
  stopped,
}

typedef WebSocketMessageHandler = void Function(dynamic message);
typedef WebSocketStatusHandler = void Function(WebsocketServerStatus status);


class WebsocketServerWrap {

  HttpServer? _server;

  WebsocketServerStatus _status = WebsocketServerStatus.stopped;
  WebsocketServerStatus get status => _status;

  String? _serverAddress;
  String? get serverAddress => _serverAddress;

  // 用于向 UI 推送事件
  final StreamController<String> _eventController = StreamController.broadcast();
  Stream<String> get events => _eventController.stream;

  // 保存所有活跃的客户端连接（可选）
  final List<WebSocket> _activeSockets = [];

  WebsocketServerWrap();


  // 启动服务器
  Future<void> start({int port = 8080}) async {
    if (_status == WebsocketServerStatus.starting ||
        _status == WebsocketServerStatus.started ||
        _status == WebsocketServerStatus.stopping) {
      return;
    }
    _updateStatus(WebsocketServerStatus.starting);

    try {
      _server = await HttpServer.bind(InternetAddress.anyIPv4, port);
      _serverAddress = 'ws://${_server?.address.host}:$port';
      _updateStatus(WebsocketServerStatus.started);
      // Log.d('🚀 WebSocket 服务器已启动: ws://${_server?.address.host}:$port');

      await for (HttpRequest request in _server!) {
        if (WebSocketTransformer.isUpgradeRequest(request)) {
          final socket = await WebSocketTransformer.upgrade(request);
          _handleNewConnection(socket, request);
        }
      }
    } catch (error) {
      // Log.e('$error');
    }
  }


  void _handleNewConnection(WebSocket socket, HttpRequest request) {
    final clientInfo = '🔌 客户端连接: ${request.connectionInfo?.remoteAddress}';
    _eventController.add(clientInfo);
    _activeSockets.add(socket); // 记录活跃连接

    socket.listen((message) {
      final msgLog = '📩 ${request.connectionInfo?.remoteAddress}: $message';
      _eventController.add(msgLog);
    },
      onDone: () {
        _eventController.add('❌ 客户端断开: ${request.connectionInfo?.remoteAddress}');
        _activeSockets.remove(socket); // 移除断开连接
      },
    );
  }


  // 停止服务器
  Future<void> stop() async {
    _updateStatus(WebsocketServerStatus.stopping);
    await _server?.close();
    // _eventController.add('🛑 服务器已停止');
    _activeSockets.clear(); // 清空所有连接
    _updateStatus(WebsocketServerStatus.stopped);
    _server = null;
    _serverAddress = null;
    // Log.d('🛑 WebSocket 服务器已停止');
  }

  void _updateStatus(WebsocketServerStatus status) {
    _status = status;
    String statusStr = '';
    switch (status) {
      case WebsocketServerStatus.starting:
        statusStr = '正在启动...';
        break;
      case WebsocketServerStatus.started:
        statusStr = '🚀 服务器已启动，监听端口: $_serverAddress';
        break;
      case WebsocketServerStatus.stopping:
        statusStr = '正在关闭...';
        break;
      case WebsocketServerStatus.stopped:
        statusStr = '🛑 服务器已关闭';
        break;
    }
    _eventController.add(statusStr);
  }


}