import 'dart:convert';
import 'dart:io';
import 'config.dart';

int createdConnectionCount = 0;
int runningConnectionCount = 0;
int upstreamBytes = 0;
int downstreamBytes = 0;
Map<int, bool> createdConnectionMap = <int, bool>{};

void main(List<String> arguments) {
  final listenAddress = "127.0.0.1";
  final listenPort = 8801;
  final targetHost = "";
  final targetPort = 443;

  parseProxyConfig('''{
  "managementConfig": { "listen": "127.0.0.1:8888" },
  "tcpListens": [
      {
      "listen": ":8443",
      "backend": "101.132.122.240:443",
      "allowIps": ["127.0.0.1"]
      }
      ]
  }''');
  parseProxyConfig('''{
  "tcpListens": [
      {
      "listen": ":8443",
      "backend": "101.132.122.240:443",
      "allowIps": ["127.0.0.1"]
      }
      ]
  }''');

  // TODO ...
  print('Hello world!');
}

void startListen(HostAndPort listen, HostAndPort target) {
  ServerSocket.bind(listen.host, listen.port).then((serverSocket) {
    serverSocket.listen((Socket socket) {
      Socket.connect(target.host, target.port).then((clientSocket) {
        final createdConnectionIndex = createdConnectionCount;
        createdConnectionCount++;
        runningConnectionCount++;
        createdConnectionMap[createdConnectionIndex] = true;
        socket.listen(
          (event) {
            upstreamBytes += event.lengthInBytes;
            clientSocket.write(event);
          },
          onError: (error, StackTrace stackTrace) {
            if (createdConnectionMap.remove(createdConnectionIndex) != null) {
              runningConnectionCount--;
            }
            print(
                'Error in connection: ' + error + " " + stackTrace.toString());
          },
          onDone: () {
            if (createdConnectionMap.remove(createdConnectionIndex) != null) {
              runningConnectionCount--;
            }
            clientSocket.destroy();
          },
          cancelOnError: true,
        );

        clientSocket.listen(
          (event) {
            downstreamBytes += event.lengthInBytes;
            socket.write(event);
          },
          onError: (error, StackTrace stackTrace) {
            if (createdConnectionMap.remove(createdConnectionIndex) != null) {
              runningConnectionCount--;
            }
            print(
                'Error in connection: ' + error + " " + stackTrace.toString());
          },
          onDone: () {
            if (createdConnectionMap.remove(createdConnectionIndex) != null) {
              runningConnectionCount--;
            }
            socket.destroy();
          },
          cancelOnError: true,
        );
      });
    });
  });
}