import 'dart:convert';
import 'dart:math';
import 'dart:ui';

import 'package:flutter/cupertino.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter_webrtc/flutter_webrtc.dart';
import 'package:signalr_netcore/http_connection_options.dart';
import 'package:signalr_netcore/hub_connection.dart';
import 'package:signalr_netcore/hub_connection_builder.dart';
import 'package:signalr_netcore/itransport.dart';
import 'package:test_sa/controllers/api_routes/urls.dart';
import 'package:test_sa/modules/cx_module/chat/api_client.dart';
import 'package:http/http.dart' as http;

import '../chat_provider.dart';
import '../model/chat_login_response_model.dart';

HubConnection? callHubConnection;

class CallProvider with ChangeNotifier, DiagnosticableTreeMixin {
  ///////////////////// Web RTC Video Calling //////////////////////
  // Video Call
  late RTCPeerConnection _peerConnection;
  RTCVideoRenderer _localVideoRenderer = RTCVideoRenderer();
  final RTCVideoRenderer _remoteRenderer = RTCVideoRenderer();

  MediaStream? _localStream;
  MediaStream? _remoteStream;

  bool isMuted = false;
  bool isSpeakerOn = false;
  bool isCameraOn = true;
  bool isPeerMuted = false;
  bool isPeerCameraOn = true;

  bool isLoading = false;

  String currentStatus = "Connecting...";

  bool _ownsConnection = false;

  void _setStatus(String status) {
    if (currentStatus == status) return;
    currentStatus = status;
    notifyListeners();
  }

  Future<void> _disposeConnection() async {
    final HubConnection? connection = callHubConnection;
    final bool owns = _ownsConnection;
    callHubConnection = null;
    _ownsConnection = false;
    if (connection == null || !owns) return;
    try {
      await connection.stop();
    } catch (e) {
      if (kDebugMode) {
        print('⚠️ Error closing call SignalR connection: $e');
      }
    }
  }

  Future<void> endSession() async {
    stopListeners();
    onFailed = null;
    onSuccess = null;
    isMuted = false;
    isPeerMuted = false;
    currentStatus = "Connecting...";
    await _disposeConnection();
  }

  @override
  void dispose() {
    _disposeConnection().then((_) {}).catchError((error) {});
    super.dispose();
  }

  /// See [ChatProvider.buildHubConnection] for why a `:0` port can show up in
  /// SignalR websocket errors - it is a `dart:io` artifact (Uri.port == 0 for
  /// the `wss` scheme), not a real port. Read the trailing HTTP status instead.
  Future<HubConnection> getHubConnection(String token) async {
    // Encode the JWT properly and also pass it as an Authorization header:
    // on mobile signalr_netcore ignores the query token for the websocket
    // handshake and relies on `accessTokenFactory`.
    final String hubUrl = _urlWithExplicitPort(
      Uri.parse(URLs.chatHubUrlChat).replace(queryParameters: <String, String>{
        "access_token": token,
      }),
    );

    final HttpConnectionOptions httpOp = HttpConnectionOptions(
      transport: HttpTransportType.LongPolling,
      skipNegotiation: false,
      logMessageContent: false,
      accessTokenFactory: () async => token,
      requestTimeout: 30000,
    );

    return HubConnectionBuilder()
        .withUrl(hubUrl, options: httpOp)
        .withAutomaticReconnect(retryDelays: <int>[2000, 5000, 10000, 20000])
        .build();
  }

  /// Writes the port into the url *textually*.
  ///
  /// Why this is not just `uri.replace(port: 443)`: `Uri` normalises a port away
  /// when it equals the scheme default, so `.replace(port: 443)` on an https uri
  /// serialises back to `https://host/...` with no port at all. signalr_netcore
  /// only does string surgery on this url (`url.replaceFirst('http', 'ws')`), so
  /// the port has to be present in the string to survive into the `wss://` form.
  /// Without it `Uri.port` is `0` for `ws`/`wss` (dart:io only knows defaults for
  /// http/https), which is exactly what gets echoed back as `https://host:0/...`
  /// in WebSocketException messages.
  static String _urlWithExplicitPort(Uri uri) {
    final int port = uri.hasPort ? uri.port : (uri.scheme == 'https' || uri.scheme == 'wss' ? 443 : 80);
    final String query = uri.query.isEmpty ? '' : '?${uri.query}';
    return '${uri.scheme}://${uri.host}:$port${uri.path}$query';
  }

  Future<bool> buildHubConnection(String employeeNumber, {HubConnection? hubC}) async {
    _setStatus("Connecting...");
    try {
      if (hubC != null) {
        final bool reused = await _adoptExistingConnection(hubC);
        if (reused) return true;
        if (kDebugMode) {
          print('ℹ️ Shared chat hub not usable (state: ${hubC.state}), opening a dedicated call connection.');
        }
      }
      await _disposeConnection();

      final http.Response response = await ApiClient().postJsonForResponse(
        URLs.chatSdkToken,
        {"apiKey": URLs.chatApiKey, "employeeNumber": employeeNumber, "voIPToken": null},
      );
      if (response.statusCode != 200) {
        if (kDebugMode) {
          print('⚠️ Call token request failed: HTTP ${response.statusCode}');
        }
        return false;
      }

      final ChatLoginResponse chatResponse = ChatLoginResponse.fromJson(jsonDecode(response.body));
      if (chatResponse.token == null || chatResponse.token!.isEmpty) {
        if (kDebugMode) {
          print('⚠️ Call token request returned an empty token.');
        }
        return false;
      }

      callHubConnection = await getHubConnection(chatResponse.token!);
      _ownsConnection = true;
      await callHubConnection!.start();
      return callHubConnection?.state == HubConnectionState.Connected;
    } catch (e) {
      if (kDebugMode) {
        print('⚠️ Error building call SignalR connection: $e');
      }
      await _disposeConnection();
      return false;
    }
  }

  Future<bool> _adoptExistingConnection(HubConnection hubC) async {
    switch (hubC.state) {
      case HubConnectionState.Connected:
        callHubConnection = hubC;
        _ownsConnection = false;
        return true;
      case HubConnectionState.Connecting:
      case HubConnectionState.Reconnecting:
        final bool connected = await _waitUntilConnected(hubC);
        if (connected) {
          callHubConnection = hubC;
          _ownsConnection = false;
        }
        return connected;
      case HubConnectionState.Disconnected:
        // Chat side dropped it - we can legally restart it, but we do not own it
        // so we must not stop it when the call ends.
        try {
          await hubC.start();
          if (hubC.state == HubConnectionState.Connected) {
            callHubConnection = hubC;
            _ownsConnection = false;
            return true;
          }
        } catch (e) {
          if (kDebugMode) {
            print('⚠️ Could not restart shared chat hub for call: $e');
          }
        }
        return false;
      default:
        // Disconnecting (or unknown) - do not touch it, build our own instead.
        return false;
    }
  }

  Future<bool> _waitUntilConnected(HubConnection hub, {Duration timeout = const Duration(seconds: 15)}) async {
    final DateTime deadline = DateTime.now().add(timeout);
    while (DateTime.now().isBefore(deadline)) {
      final HubConnectionState? state = hub.state;
      if (state == HubConnectionState.Connected) return true;
      if (state == HubConnectionState.Disconnected || state == HubConnectionState.Disconnecting) return false;
      await Future<void>.delayed(const Duration(milliseconds: 200));
    }
    return hub.state == HubConnectionState.Connected;
  }

  bool get isHubConnected => callHubConnection?.state == HubConnectionState.Connected;

  void initAudioCallListeners() {
    final HubConnection? hub = callHubConnection;
    if (hub == null) return;
    hub.on("OnCallAcceptedAsync", onCallAcceptedAsync);
    hub.on("OnIceCandidateAsync", onIceCandidateAsync);
    hub.on("OnOfferAsync", onOfferAsync);
    hub.on("OnAnswerOffer", onAnswerOffer);
    hub.on("OnHangUpAsync", onHangUpAsync);
    hub.on("OnCallDeclinedAsync", onCallDeclinedAsync);
    hub.on('OnAudioToggle', onAudioToggle);
  }

  void initCallListeners() {
    final HubConnection? hub = callHubConnection;
    if (hub == null) return;
    initAudioCallListeners();
    hub.on('OnCameraToggle', onCameraToggle);
  }

  //Video Constraints
  var videoConstraints = {
    "video": {
      "mandatory": {
        "width": {"min": 320},
        "height": {"min": 180}
      },
      "optional": [
        {
          "width": {"max": 1280}
        },
        {"frameRate": 25},
        {"facingMode": "user"}
      ]
    },
    "frameRate": 25,
    "width": 420, //420,//640,//1280,
    "height": 240 //240//480//720
  };

  // Audio Constraints
  var audioConstraints = {
    "sampleRate": 8000,
    "sampleSize": 16,
    "channelCount": 2,
    "echoCancellation": true,
    "audio": true,
  };

  Future<RTCPeerConnection> _createPeerConnection() async {

    Map<String, dynamic> configuration = {
      "iceServers": [
        {"urls": 'stun:15.185.116.59:3478'},
        {
          "urls": "turn:15.185.116.59:3479",
          "username": "admin",
          "credential": "admin",
        },
        {"urls": "stun:stun.l.google.com:19302"},
        {"urls": "stun:stun1.l.google.com:19302"},
      ]
    };

    Map<String, dynamic> offerSdpConstraints = {
      "mandatory": {
        "OfferToReceiveAudio": true,
        "OfferToReceiveVideo": true,
      },
      "optional": [],
    };

    RTCPeerConnection pc = await createPeerConnection(configuration, offerSdpConstraints);
    // if (pc != null) print(pc);
    //pc.addStream(widget.localStream);

    pc.onIceCandidate = (e) {
      if (e.candidate != null) {
        print(json.encode({
          'candidate': e.candidate.toString(),
          'sdpMid': e.sdpMid.toString(),
          'sdpMlineIndex': e.sdpMLineIndex,
        }));
      }
    };
    pc.onIceConnectionState = (e) {
      print(e);
    };
    pc.onAddStream = (stream) {
      print('addStream: ' + stream.id);
      _remoteRenderer.srcObject = stream;
    };
    return pc;
  }

  void init() {
    initRenderers();
    _createPeerConnection().then((pc) {
      _peerConnection = pc;
      // _setRemoteDescription(widget.info);
    });
  }

  void initRenderers() {
    _localVideoRenderer.initialize();
    _remoteRenderer.initialize();
    initLocalCamera();
  }

  void initLocalCamera() async {
    _localStream = await navigator.mediaDevices.getUserMedia({'video': true, 'audio': true});
    _localVideoRenderer.srcObject = _localStream;
    // _localVideoRenderer.srcObject = await navigator.mediaDevices
    //     .getUserMedia({'video': true, 'audio': true});
    print('this source Object');
    print('this suarce  ${_localVideoRenderer.srcObject != null}');
    notifyListeners();
  }

  String? senderN;
  String? recipientN;
  bool? isVideo;
  int moduleId = 1004;
  int? referenceID;

  Function(String message)? onFailed;
  Function(String message)? onSuccess;

  void startCall(String? senderN, String? recipientN, bool? isVideo, int? moduleId, int? referenceID, {Function(String message)? onFailed, Function(String message)? onSuccess}) async {
    this.senderN = senderN;
    this.recipientN = recipientN;
    this.isVideo = isVideo;
    // this.moduleId = moduleId;
    this.referenceID = referenceID;
    this.onFailed = onFailed;
    this.onSuccess = onSuccess;
    if (senderN == null || senderN.isEmpty || recipientN == null || recipientN.isEmpty) {
      onFailed?.call("Call participants could not be resolved. Please reopen the chat and try again.");
      return;
    }
    try {
      await invoke(invokeMethod: "CallUserAsync", currentUserID: senderN, targetUserID: recipientN, isVideoCall: isVideo ?? false, data: [this.moduleId, referenceID]);
      _setStatus("Ringing...");
    } catch (e) {
      if (kDebugMode) {
        print('⚠️ CallUserAsync failed: $e');
      }
      _setStatus("Call failed");
      onFailed?.call("Could not reach the call service. Please check your connection and try again.");
    }
  }

  void acceptCall(String senderN, String recipientN, bool isVideo, {required int moduleId}) async {
    this.senderN = senderN;
    this.recipientN = recipientN;
    try {
      await invoke(invokeMethod: "AnswerCallAsync", currentUserID: senderN, targetUserID: recipientN, isVideoCall: isVideo, data: [this.moduleId]);
    } catch (e) {
      if (kDebugMode) {
        print('⚠️ AnswerCallAsync failed: $e');
      }
      _setStatus("Call failed");
      onFailed?.call("Could not join the call. Please try again.");
    }
  }

  Future declineCall(String senderN, String recipientN, {required int moduleId}) async {
    try {
      await invoke(invokeMethod: "CallDeclinedAsync", currentUserID: senderN, targetUserID: recipientN, isVideoCall: false, data: [this.moduleId]);
    } catch (e) {
      if (kDebugMode) {
        print('⚠️ CallDeclinedAsync failed: $e');
      }
    }
  }

  void endCall(String senderN, String recipientN, {required int moduleId}) async {
    try {
      await invoke(invokeMethod: "HangUpAsync", currentUserID: senderN, targetUserID: recipientN, data: [moduleId]);
    } catch (e) {
      if (kDebugMode) {
        print('⚠️ HangUpAsync failed: $e');
      }
    }
  }

  void toggleMute() async {
    if (senderN == null || recipientN == null) return;
    try {
      await invoke(invokeMethod: "AudioToggle", currentUserID: senderN!, targetUserID: recipientN!);
      isMuted = !isMuted;
      notifyListeners();
    } catch (e) {
      if (kDebugMode) {
        print('⚠️ AudioToggle failed: $e');
      }
    }
  }

  void checkCall(Map<String, dynamic> message) {
    switch (message["callStatus"]) {
      case 'connected':
        {}
        break;
      case 'offer':
        {}
        break;
      case 'accept':
        {}
        break;
      case 'candidate':
        {}
        break;
      case 'bye':
        {}
        break;
      case 'leave':
        {}
        break;
    }
  }

  //// Listeners Methods ////

  void onCallAcceptedAsync(List<Object?>? params) {
    print("onCallAcceptedAsync: $params");
    _setStatus("Connected");
  }

  void onIceCandidateAsync(List<Object?>? params) {
    print("onCallAcceptedAsync: $params");
  }

  void onOfferAsync(List<Object?>? params) {
    print("onCallAcceptedAsync: $params");
    print("onCallAcceptedAsync: $params");
  }

  void onAnswerOffer(List<Object?>? params) {
    print("onAnswerOffer: $params");
  }

  void onHangUpAsync(List<Object?>? params) {
    print("onHangUpAsync: $params");
    handleResponse(params);
  }

  void onCallDeclinedAsync(List<Object?>? params) {
    print("onCallDeclinedAsync: $params");
    handleResponse(params);
    // try {
    //   if (params?.isNotEmpty ?? false) {
    //     print("onCallDeclinedAsync:${params?.length}:${params}");
    //     if (params!.length > 2) {
    //       print("runTimeData:${params[1].runtimeType}");
    //       var data = jsonDecode(jsonEncode(params[1].toString()));
    //       print("runTimeData:${data.runtimeType}");
    //       onFailed?.call("Call Declined, ${data["targetUserId"]} has declined your call.");
    //       return;
    //     } else {  print("runTimeData:${params[0].runtimeType}");
    //       var data = jsonDecode(params[0].toString());
    //       print("runTimeData:${data.runtimeType}");
    //       onFailed?.call("Call Declined, ${data["targetUserId"]} has declined your call.");
    //       return;
    //     }
    //   }
    // } catch (ex) {
    //   print("Ex:$ex");
    //   onFailed?.call("Call Declined, User has declined your call.");
    // }
  }

  void onAudioToggle(List<Object?>? params) {
    print("onAudioToggle: $params");
    isPeerMuted = !isPeerMuted;
    notifyListeners();
  }

  void onCameraToggle(List<Object?>? params) {
    print("onCameraToggle: $params");
  }

  //// Invoke Methods

  Future<void> invoke({required String invokeMethod, required String currentUserID, required String targetUserID, bool isVideoCall = false, var data}) async {
    List<Object> args = [];
    if (data != null) {
      data = data.toString().replaceFirst("[", "").replaceFirst("]", "");
    }
    if (invokeMethod == "AnswerCallAsync") {
      args = [currentUserID, targetUserID, data];
    } else if (invokeMethod == 'CallDeclinedAsync') {
      args = [currentUserID, targetUserID, data];
    } else if (invokeMethod == "CallUserAsync") {
      args = [currentUserID, targetUserID, isVideoCall];
    } else if (invokeMethod == "HangUpAsync") {
      args = [currentUserID, targetUserID, data];
    } else if (invokeMethod == "AudioToggle") {
      args = [currentUserID, targetUserID];
    } else if (invokeMethod == "IceCandidateAsync") {
      args = [targetUserID, data];
    } else if (invokeMethod == "OfferAsync") {
      args = [targetUserID, data];
    } else if (invokeMethod == "AnswerOfferAsync") {
      args = [targetUserID, data];
    }
    print("Invoking:$invokeMethod:$args");
    final HubConnection? hub = callHubConnection;
    if (hub == null || hub.state != HubConnectionState.Connected) {
      throw StateError("Call hub is not connected (state: ${hub?.state}). Cannot invoke $invokeMethod.");
    }
    await hub.invoke(invokeMethod, args: args);
  }

  void stopListeners() async {
    callHubConnection?.off('OnCallDeclinedAsync');
    callHubConnection?.off('OnCallAcceptedAsync');
    callHubConnection?.off('OnIceCandidateAsync');
    callHubConnection?.off('OnAnswerOffer');
    callHubConnection?.off('OnOfferAsync');
    callHubConnection?.off('OnHangUpAsync');
    callHubConnection?.off('OnAudioToggle');
    callHubConnection?.off('OnCameraToggle');
  }

  handleResponse(List<Object?>? params) {
    if (params?.isNotEmpty ?? false) {
      if (params![0] == "NO_ANSWER") {
        onFailed?.call("No Answer, User did not answer your call.");
        return;
      } else if (params[0] == "NO_ANSWER") {
        onFailed?.call("Call Declined, User has declined your call.");
        return;
      } else if (params[0] == 'USER_BUSY') {
        onFailed?.call("The user is currently busy on another call");
      } else if (params[0] == 'USER_DECLINE') {
        onFailed?.call("Call Declined, User has declined your call.");
      } else if (params[0] == 'USER_OFFLINE') {
        onFailed?.call("The user is currently offline");
      } else {
        onSuccess?.call("");
      }
    }
  }
}