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

class RtkBase {
  // String host = "192.168.1.6";
  // String host = "120.253.239.161"; //ip地址
  // int port = 8001; //端口号
  // String account = "csar6309"; //用户名
  // String password = "9kd6kmd3"; //密码
  // String mountPoint = "RTCM33_GRCE"; //挂载点
  String host = "vrs.sixents.com";
  int port = 8005; //端口号
  String account = "uhjns21929"; //用户名
  String password = "UpqbKp4Q"; //密码
  String mountPoint = "RTCM32_GRECJ2"; //挂载点
  String lastGGA = ""; //最后一次发送的GGA
  Socket? _client;
  bool isConnected = false;
  int lastSendGGATime = 0;
  var rtcmStreamController = StreamController<Uint8List>.broadcast();
  Stream<Uint8List> get rtcmStream => rtcmStreamController.stream;
  var updateCount = 0; //
  dispose() {
    close();
  }

  connect() {
    var headers = [
      "GET /$mountPoint HTTP/1.0",
      "Host: $host",
      "Ntrip-Version: Ntrip/2.0",
      "User-Agent: NTRIP u-blox",
      "Accept: */*",
      "Authorization: Basic ${base64Encode(('$account:$password').codeUnits)}",
      "Connection: close",
      "\r\n"
    ];
    Socket.connect(host, port).then((Socket client) {
      _client = client;
      log('Connected to: ${client.remoteAddress.address}:${client.remotePort}');
      var reqStr = headers.join("\r\n");
      client.write(reqStr);
      log(reqStr);

      client.listen(
        (Uint8List data) {
          if (data[0] == 211) {
            rtcmStreamController.add(data);
          } else {
            String response = String.fromCharCodes(data);
            log("Connected to NTRIP caster: $response");
            if (response.contains("ICY 200 OK")) {
              if (lastGGA.isNotEmpty) {
                _client!.write(lastGGA);
                lastSendGGATime = DateTime.now().millisecondsSinceEpoch;
              }
            } else {
              log("Failed to connect to NTRIP caster", error: response);
              client.close();
              _client = null;
            }
          }
        },
        onError: (error) {
          log("Error reading from response body: $error");
          // client.close();
        },
      );
      client.done.then((_) {
        log('Connection to NTRIP caster closed');
        _client = null;
      });
    }).catchError((error) {
      log("Error connecting to server: $error");
      _client = null;
    });
  }

  close() {
    if (_client != null) {
      _client!.close();
      _client = null;
    }
  }

  sendGGA(String gga) {
    var now = DateTime.now().millisecondsSinceEpoch;
    if (now - lastSendGGATime > 10000 && _client != null) {
      lastGGA = "$gga\r\n";
      _client!.write(lastGGA);
      lastSendGGATime = now;
    }
  }
}