import 'dart:async';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter_webrtc/flutter_webrtc.dart' as rtc;
import 'package:matrix/matrix.dart';
import 'package:webrtc_interface/webrtc_interface.dart';
import 'package:pyramid/core/call_foreground.dart';
import 'package:pyramid/core/ice_servers.dart';
import 'package:pyramid/core/settings_prefs.dart';
import 'package:pyramid/features/call_signaling/call_signaling_service.dart';
import 'package:pyramid/widgets/screen_share_picker.dart';

/// Implementierung von [CallSignalingService] (Modul `call_signaling`).
/// Wird ausschließlich vom Kompositions-Punkt (`matrix_client.dart`)
/// konstruiert; alle anderen gehen über `callSignalingProvider`.
class PyramidVoipManager extends CallSignalingService
    implements WebRTCDelegate {
  static PyramidVoipManager? _instance;
  static PyramidVoipManager get instance => _instance!;

  final Client client;
  late final VoIP voip;
  late final Zone _sdkZone;
  @override
  CallSession? currentCall;

  @override
  final rtc.RTCVideoRenderer localRenderer = rtc.RTCVideoRenderer();
  @override
  final rtc.RTCVideoRenderer remoteRenderer = rtc.RTCVideoRenderer();
  bool _renderersInitialized = false;

  bool _isMicMuted = false;
  bool _isCameraMuted = true;
  bool _isScreensharing = false;
  bool _isRemoteScreensharing = false;
  bool _isDeafened = false;
  bool _isUpdating = false;
  String? _selectedSourceId;

  // Handy: Lautsprecher statt Hörmuschel (wie Discord). Das SDK schaltet bei
  // Sprachanrufen auf die Hörmuschel – hält man das Handy vor sich, hört man
  // dann praktisch nichts (Bernds Test 2026-10-07).
  bool _speakerOn = true;
  bool get _isMobile =>
      !kIsWeb &&
      (defaultTargetPlatform == TargetPlatform.android ||
          defaultTargetPlatform == TargetPlatform.iOS);

  @override
  bool get isSpeakerOn => _speakerOn;

  @override
  Future<void> toggleSpeaker() async {
    _speakerOn = !_speakerOn;
    notifyListeners();
    await _applySpeaker();
  }

  Future<void> _applySpeaker() async {
    if (!_isMobile) return;
    try {
      await rtc.Helper.setSpeakerphoneOn(_speakerOn);
    } catch (e) {
      debugPrint('[VOIP] Lautsprecher: $e');
    }
  }
  String _currentQualityKey = 'hd';

  @override
  bool get isMicMuted => _isMicMuted;
  @override
  bool get isCameraMuted => _isCameraMuted;
  @override
  bool get isScreensharing => _isScreensharing;
  @override
  bool get isRemoteScreensharing => _isRemoteScreensharing;
  @override
  bool get isDeafened => _isDeafened;
  @override
  String get currentQualityKey => _currentQualityKey;

  PyramidVoipManager(this.client) {
    _instance = this;
    // VOR dem SDK anmelden: Kandidaten der Gegenseite puffern (siehe
    // _bufferRemoteCandidates).
    _callEventSub = client.onCallEvents.stream.listen(_bufferRemoteCandidates);
    // Alles, was das Anruf-SDK anstößt, läuft in einer eigenen Zone: Fehler,
    // die SDK/WebRTC-Plugin ins Leere werfen (z. B. Lautsprecher-Umschalten
    // unter Windows, getRemoteDescription wirft statt null), werden
    // protokolliert statt als „unbehandelt“ durchzuschlagen.
    _sdkZone = Zone.current.fork(
      specification: ZoneSpecification(
        handleUncaughtError: (self, parent, zone, error, stack) {
          debugPrint('[VOIP] SDK-Fehler (abgefangen): $error');
        },
      ),
    );
    voip = _sdkZone.run(() => VoIP(client, this));
    // Suppress speakerphone call — not supported on Windows/Desktop
    try {
      (voip as dynamic).onConfigSpeakerphone = (bool _) async {};
    } catch (_) {}
    _ensureRenderers();
  }

  /// Führt [f] in der SDK-Zone aus. Ergebnis UND Fehler kommen über einen
  /// Completer von außen zurück – Fehler können Zonengrenzen sonst nicht
  /// überqueren, und der Aufrufer würde ewig warten.
  Future<T> _inSdkZone<T>(Future<T> Function() f) {
    final done = Completer<T>();
    _sdkZone.run(() async {
      try {
        done.complete(await f());
      } catch (e, s) {
        done.completeError(e, s);
      }
    });
    return done.future;
  }

  @override
  void dispose() {
    _callEventSub?.cancel();
    _levelTimer?.cancel();
    _renderRefreshTimer?.cancel();
    super.dispose();
  }

  Future<void> _ensureRenderers() async {
    if (_renderersInitialized) return;
    try {
      await localRenderer.initialize();
      await remoteRenderer.initialize();
      _renderersInitialized = true;
    } catch (e) {
      debugPrint('[VOIP] Renderer init error: $e');
    }
  }

  @override
  MediaDevices get mediaDevices => MediaDevicesWrapper(rtc.navigator.mediaDevices, this);

  @override
  bool get isWeb => kIsWeb;

  @override
  Future<RTCPeerConnection> createPeerConnection(
    Map<String, dynamic> configuration, [
    Map<String, dynamic> constraints = const {},
  ]) async {
    // Zusätzliche ICE-Server (STUN/TURN aus ice.json) zu den vom Homeserver
    // gelieferten mergen — ohne STUN scheitern Calls außerhalb des LANs,
    // weil der Server hinter CGNAT hängt.
    try {
      final extra = await IceServers.get();
      final merged = Map<String, dynamic>.from(configuration);
      final existing =
          (merged['iceServers'] as List?)?.cast<Map<String, dynamic>>() ?? [];
      merged['iceServers'] = [...existing, ...extra];
      configuration = merged;
    } catch (e) {
      debugPrint('[VOIP] ICE server merge error: $e');
    }
    return rtc.createPeerConnection(configuration, constraints);
  }

  @override
  Future<void> handleNewCall(CallSession call) async {
    debugPrint('[VOIP] Incoming call ${call.callId} (type: ${call.type})');
    await _ensureRenderers();
    currentCall = call;
    _isCameraMuted = call.type == CallType.kVoice;
    _speakerOn = true;
    _isDeafened = false;
    _isMicMuted = false;
    _setupCallListeners(call);
    _updateInternalStates();
    notifyListeners();
    unawaited(_applyBufferedCandidates(call));
  }

  // ── Netzwerk-Kandidaten der Gegenseite puffern ───────────────────────────
  // Lücke im matrix-SDK (6.2): Kommen die Kandidaten des Anrufers an, bevor
  // die Einladung fertig verarbeitet ist, verwirft das SDK sie endgültig
  // („we do not have the call“); Kandidaten, die WÄHREND des Annehmens
  // eintreffen, landen in einer Warteschlange, die nie mehr abgearbeitet
  // wird. Dann kennt man keinen Weg zur Gegenseite – im Heimnetz rettet das
  // oft noch ein direkter Prüfversuch der anderen Seite, über Mobilfunk/NAT
  // dauert der Aufbau ewig oder scheitert (Bernd 2026-10-08, im Anruftest
  // nachgestellt). Deshalb: alle Kandidaten mitschreiben und direkt an die
  // Verbindung geben, sobald sie die Gegenseite kennt. Doppelte ignoriert
  // WebRTC.
  StreamSubscription<List<BasicEventWithSender>>? _callEventSub;
  final _candidateBuffer = <String, List<Map<String, dynamic>>>{};
  final _appliedCandidates = <String>{};

  void _bufferRemoteCandidates(List<BasicEventWithSender> events) {
    for (final e in events) {
      if (e.type != EventTypes.CallCandidates || e.senderId == client.userID) {
        continue;
      }
      final callId = e.content.tryGet<String>('call_id');
      final list = e.content.tryGetList<Map<String, dynamic>>('candidates');
      if (callId == null || list == null) continue;
      final party = e.content.tryGet<String>('party_id');
      (_candidateBuffer[callId] ??= []).addAll(
        list.map((c) => {...c, '_party': party}),
      );
      // Nur die letzten Anrufe behalten.
      while (_candidateBuffer.length > 8) {
        _candidateBuffer.remove(_candidateBuffer.keys.first);
      }
      final call = currentCall;
      if (call != null && call.callId == callId) {
        unawaited(_applyBufferedCandidates(call));
      }
    }
  }

  Future<void> _applyBufferedCandidates(CallSession call) async {
    final pc = call.pc;
    final list = _candidateBuffer[call.callId];
    if (pc == null || list == null || list.isEmpty) return;
    try {
      if (await pc.getRemoteDescription() == null) return;
    } catch (_) {
      return;
    }
    for (final c in List.of(list)) {
      final cand = c['candidate'];
      if (cand is! String || cand.isEmpty) continue;
      final party = c['_party'];
      final remoteParty = call.remotePartyId;
      if (remoteParty != null && party != null && party != remoteParty) continue;
      if (!_appliedCandidates.add('${call.callId}|$cand')) continue;
      try {
        await pc.addCandidate(rtc.RTCIceCandidate(
          cand,
          c['sdpMid']?.toString() ?? '',
          (c['sdpMLineIndex'] as num?)?.round() ?? 0,
        ));
      } catch (e) {
        debugPrint('[VOIP] Kandidat nachreichen: $e');
      }
    }
  }

  Timer? _renderRefreshTimer;
  String? _listenedCallId;
  void _setupCallListeners(CallSession call) {
    // Ausgehende Anrufe meldet das SDK zusätzlich über handleNewCall –
    // Listener nur einmal je Anruf anhängen.
    if (_listenedCallId == call.callId) return;
    _listenedCallId = call.callId;
    call.onCallStateChanged.stream.listen((state) {
      debugPrint('[VOIP] State: $state');
      _updateInternalStates();

      if (state == CallState.kConnected) {
        if (!_isCameraMuted) {
          debugPrint('[VOIP] Ensuring camera is unmuted on connect');
          call.setLocalVideoMuted(false);
        }
        _applySpeaker();
        _startLevelPolling();
        // Android: Mikrofon im Hintergrund + „Anruf läuft“-Benachrichtigung.
        CallForeground.callStarted('voip',
            title: call.room.getLocalizedDisplayname());
      }
      if (state == CallState.kEnded) {
        _stopLevelPolling();
        CallForeground.callEnded('voip');
      }
      _updateRenderers();
    });
    // Das SDK setzt bei jedem neuen eigenen Medienstrom die Hörmuschel –
    // danach unsere Wahl erneut anwenden.
    call.onCallEventChanged.stream.listen((event) {
      if (event == CallStateChange.kFeedsChanged) _applySpeaker();
    });

    _renderRefreshTimer?.cancel();
    _renderRefreshTimer = Timer.periodic(
      const Duration(milliseconds: 1000), // Faster polling to catch feeds
      (_) {
        _updateRenderers();
        // Gepufferte Kandidaten nachreichen, sobald die Verbindung die
        // Gegenseite kennt (nach Annehmen bzw. Antwort).
        final c = currentCall;
        if (c != null && c.state != CallState.kConnected) {
          _applyBufferedCandidates(c);
        }
      },
    );

    _updateRenderers();
  }

  void _updateInternalStates() {
    if (currentCall == null) return;
    final dynamic c = currentCall;
    try {
      _isMicMuted = c.isMicrophoneMuted == true;
      _isCameraMuted = c.isLocalVideoMuted == true;
    } catch (_) {}
    notifyListeners();
  }

  Future<void> _updateRenderers() async {
    final call = currentCall;
    if (call == null || _isUpdating) return;
    _isUpdating = true;

    try {
      await _ensureRenderers();
      // Typisierte SDK-Zugriffe. Früher lief das über ein dynamisches
      // `getFeeds()` – das gibt es im SDK gar nicht; der Fehler wurde
      // geschluckt, und Bildschirmübertragungen wurden weder beim Empfänger
      // angezeigt noch beim Sender als aktiv erkannt (Bernd 2026-10-08).
      rtc.MediaStream? video(WrappedMediaStream? w, {bool respectMute = false}) {
        final s = w?.stream;
        // stopped: Gegenseite hat die Übertragung beendet (das SDK lässt den
        // Strom stehen und markiert ihn nur).
        if (w == null || w.stopped || s == null || s.getVideoTracks().isEmpty) {
          return null;
        }
        if (respectMute && w.videoMuted) return null;
        return s;
      }

      final remoteScreen = video(call.remoteScreenSharingStream);
      final localScreen = video(call.localScreenSharingStream);
      final remoteUser = call.remoteUserMediaStream?.stream;

      var changed = false;
      final remoteSharing = remoteScreen != null;
      final localSharing = call.localScreenSharingStream != null;
      if (remoteSharing != _isRemoteScreensharing ||
          localSharing != _isScreensharing) {
        changed = true;
      }
      _isRemoteScreensharing = remoteSharing;
      _isScreensharing = localSharing;

      if (_isDeafened) _applyDeafen(call);

      // Ausgabelautstärke (Settings-Slider) auf den Ton der Gegenseite –
      // nur einmal pro Stream, _updateRenderers läuft auch per Timer.
      if (remoteUser != null && remoteUser.id != _volumeAppliedStreamId) {
        _volumeAppliedStreamId = remoteUser.id;
        _remoteAudioStream = remoteUser;
        applyOutputVolume();
      }

      // Bildschirm hat Vorrang vor der Kamera.
      final remoteVideo =
          remoteScreen ?? video(call.remoteUserMediaStream, respectMute: true);
      final localVideo =
          localScreen ?? video(call.localUserMediaStream, respectMute: true);

      if (remoteRenderer.srcObject?.id != remoteVideo?.id) {
        debugPrint('[VOIP] Remote-Video: ${remoteVideo?.id} (Bildschirm: $remoteSharing)');
        remoteRenderer.srcObject = remoteVideo;
        changed = true;
      }
      if (localRenderer.srcObject?.id != localVideo?.id) {
        debugPrint('[VOIP] Lokales Video: ${localVideo?.id} (Bildschirm: $localSharing)');
        localRenderer.srcObject = localVideo;
        changed = true;
      }

      if (changed) notifyListeners();
    } catch (e) {
      debugPrint('[VOIP] Error in _updateRenderers: $e');
    } finally {
      _isUpdating = false;
    }
  }

  // ── Wer spricht gerade? (Pegel aus den WebRTC-Statistiken) ───────────────
  // Zeigt den grünen Sprech-Ring wie bei Discord – und macht sichtbar, wo
  // Ton verloren geht: leuchtet „Du“ beim Sprechen nicht, kommt vom eigenen
  // Mikrofon nichts an; leuchtet die Gegenseite nicht, kommt nichts an.
  Timer? _levelTimer;
  bool _localSpeaking = false;
  bool _remoteSpeaking = false;

  @override
  bool get isLocalSpeaking => _localSpeaking;
  @override
  bool get isRemoteSpeaking => _remoteSpeaking;

  void _startLevelPolling() {
    _levelTimer?.cancel();
    _levelTimer = Timer.periodic(
      const Duration(milliseconds: 300),
      (_) => _pollLevels(),
    );
  }

  void _stopLevelPolling() {
    _levelTimer?.cancel();
    _levelTimer = null;
    _localSpeaking = false;
    _remoteSpeaking = false;
  }

  Future<void> _pollLevels() async {
    final pc = currentCall?.pc;
    if (pc == null) return;
    try {
      double local = 0;
      double remote = 0;
      for (final r in await pc.getStats()) {
        if (r.values['kind'] != 'audio') continue;
        final level = (r.values['audioLevel'] as num?)?.toDouble() ?? 0;
        if (r.type == 'media-source' && level > local) local = level;
        if (r.type == 'inbound-rtp' && level > remote) remote = level;
      }
      // Hysterese: an ab 0,03, aus unter 0,01 – kein Flackern.
      bool speaking(bool was, double level) => was ? level > 0.01 : level > 0.03;
      final ls = speaking(_localSpeaking, _isMicMuted ? 0 : local);
      final rs = speaking(_remoteSpeaking, remote);
      if (ls != _localSpeaking || rs != _remoteSpeaking) {
        _localSpeaking = ls;
        _remoteSpeaking = rs;
        notifyListeners();
      }
    } catch (_) {}
  }

  @override
  Future<void> handleCallEnded(CallSession session) async {
    if (currentCall?.callId == session.callId) {
      _renderRefreshTimer?.cancel();
      _renderRefreshTimer = null;
      _stopLevelPolling();
      localRenderer.srcObject = null;
      remoteRenderer.srcObject = null;
      _remoteAudioStream = null;
      _volumeAppliedStreamId = null;
      currentCall = null;
      _isScreensharing = false;
      _isRemoteScreensharing = false;
      notifyListeners();
    }
    CallForeground.callEnded('voip');
  }

  // ── Ausgabelautstärke (Settings-Slider "voice_output_volume") ─────────────
  rtc.MediaStream? _remoteAudioStream;
  String? _volumeAppliedStreamId;

  /// Wendet die in den Einstellungen gewählte Ausgabelautstärke auf den
  /// Remote-Audio-Stream an. Ohne [value] wird der Pref-Wert gelesen.
  @override
  Future<void> applyOutputVolume([double? value]) async {
    var v = value;
    if (v == null) {
      try {
        v = await VoicePrefs.loadOutputVolume();
      } catch (_) {
        v = 1.0;
      }
    }
    final stream = _remoteAudioStream;
    if (stream == null) return;
    for (final track in stream.getAudioTracks()) {
      try {
        await rtc.Helper.setVolume(v.clamp(0.0, 2.0), track);
      } catch (_) {}
    }
  }

  @override
  Future<void> handleMissedCall(CallSession session) async {
    if (currentCall?.callId == session.callId) {
      currentCall = null;
      notifyListeners();
    }
    CallForeground.callEnded('voip');
  }

  @override
  Future<void> handleNewGroupCall(GroupCallSession groupCall) async {}
  @override
  Future<void> handleGroupCallEnded(GroupCallSession groupCall) async {}
  @override
  bool get canHandleNewCall => currentCall == null;
  @override
  Future<void> playRingtone() async {}
  @override
  Future<void> stopRingtone() async {}
  @override
  EncryptionKeyProvider? get keyProvider => null;
  @override
  Future<void> registerListeners(CallSession session) async {}

  @override
  Future<void> safeAction(Future<dynamic> Function() action) async {
    try {
      await _inSdkZone(action);
      await Future.delayed(const Duration(milliseconds: 1000));
    } catch (e) {
      debugPrint('[VOIP] Action error: $e');
    }
    _updateInternalStates();
    _updateRenderers();
  }

  @override
  Future<void> toggleMic() => _setMicMuted(!_isMicMuted);

  Future<void> _setMicMuted(bool muted) async {
    final c = currentCall;
    if (c == null) return;
    _isMicMuted = muted;
    notifyListeners();
    try {
      await _inSdkZone(() => c.setMicrophoneMuted(muted));
    } catch (e) {
      // Das SDK schaltet die Spur VOR dem Senden der Status-Info um. Schlägt
      // nur das Senden fehl, ist das Mikro trotzdem (ent)stummt – früher
      // wurde hier blind zurückgeschaltet, und der Knopf zeigte danach das
      // Gegenteil des echten Zustands (Bernd 2026-10-08).
      debugPrint('[VOIP] Stummschalten: $e');
    }
    _isMicMuted = c.isMicrophoneMuted;
    notifyListeners();
  }

  @override
  Future<void> toggleCamera() async {
    if (currentCall == null) return;
    _isCameraMuted = !_isCameraMuted;
    notifyListeners();
    try {
      final c = currentCall!;
      await _inSdkZone(() => c.setLocalVideoMuted(_isCameraMuted));
      for (var i = 0; i < 5; i++) {
        await Future.delayed(Duration(milliseconds: 300 + (i * 200)));
        await _updateRenderers();
      }
    } catch (e) {
      debugPrint('[VOIP] toggleCamera error: $e');
      _isCameraMuted = !_isCameraMuted;
      notifyListeners();
    }
    _updateInternalStates();
    await _updateRenderers();
  }

  @override
  Future<void> toggleScreenSharing([BuildContext? context]) async {
    if (currentCall == null) return;
    final call = currentCall!;
    
    if (_isScreensharing) {
      await safeAction(() => call.setScreensharingEnabled(false));
      await CallForeground.screenCaptureStopped('voip');
      return;
    }

    if (!kIsWeb && defaultTargetPlatform == TargetPlatform.windows && context != null) {
      final selectedSource = await ScreenSharePicker.show(context);
      if (selectedSource == null) return;
      _selectedSourceId = selectedSource.id;
    } else {
      _selectedSourceId = null;
    }

    await safeAction(() async {
      await call.setScreensharingEnabled(true);
    });
  }

  @override
  Future<void> toggleDeafen() async {
    // Wie Discord: taub = Gegenseite nicht mehr hören UND selbst stumm;
    // beim Aufheben den Mikro-Zustand von vorher wiederherstellen. (Früher
    // setzte der Knopf nur ein Häkchen ohne Wirkung.)
    _isDeafened = !_isDeafened;
    notifyListeners();
    final c = currentCall;
    if (c == null) return;
    _applyDeafen(c);
    if (_isDeafened) {
      _micMutedBeforeDeafen = _isMicMuted;
      if (!_isMicMuted) await _setMicMuted(true);
    } else if (!_micMutedBeforeDeafen && _isMicMuted) {
      await _setMicMuted(false);
    }
  }

  bool _micMutedBeforeDeafen = false;

  /// Ton der Gegenseite an/aus (deaktivierte Empfangsspur = stumm).
  void _applyDeafen(CallSession call) {
    for (final w in call.getRemoteStreams) {
      for (final t in w.stream?.getAudioTracks() ?? const <MediaStreamTrack>[]) {
        if (t.enabled == _isDeafened) t.enabled = !_isDeafened;
      }
    }
  }

  @override
  Future<void> hangup() async {
    if (currentCall == null) return;
    await safeAction(() async {
      await currentCall!.hangup(reason: CallErrorCode.userHangup);
      currentCall = null;
    });
    await CallForeground.callEnded('voip');
  }

  @override
  Future<void> startCall(String roomId, {bool video = false}) async {
    final room = client.getRoomById(roomId);
    if (room == null) return;
    await _ensureRenderers();
    _isCameraMuted = !video; 
    
    _speakerOn = true;
    debugPrint('[VOIP] Starting call in room $roomId (video=$video)');
    final call = await _inSdkZone(
        () => voip.inviteToCall(room, video ? CallType.kVideo : CallType.kVoice));
    currentCall = call;
    
    _setupCallListeners(call);
    
    if (video) {
      await Future.delayed(const Duration(milliseconds: 800));
      await _inSdkZone(() => call.setLocalVideoMuted(false));
      await _updateRenderers();
    }
    
    _updateInternalStates();
    notifyListeners();
  }

  @override
  Future<void> changeQuality(String key) async {
    _currentQualityKey = key;
    if (currentCall == null) {
      notifyListeners();
      return;
    }

    if (!_isCameraMuted) {
      await toggleCamera();
      await Future.delayed(const Duration(milliseconds: 300));
      await toggleCamera();
    }
    
    if (_isScreensharing) {
      final String? oldSource = _selectedSourceId;
      await safeAction(() => currentCall!.setScreensharingEnabled(false));
      await Future.delayed(const Duration(milliseconds: 300));
      _selectedSourceId = oldSource;
      await safeAction(() => currentCall!.setScreensharingEnabled(true));
    }
    
    notifyListeners();
  }
}

class MediaDevicesWrapper extends MediaDevices {
  final MediaDevices _delegate;
  final PyramidVoipManager _manager;
  MediaDevicesWrapper(this._delegate, this._manager);

  @override
  Future<rtc.MediaStream> getUserMedia(Map<String, dynamic> constraints) async {
    final Map<String, dynamic> improvedConstraints = Map.from(constraints);
    
    final String? sourceId = _manager._selectedSourceId;
    if (sourceId != null) {
      if (improvedConstraints['video'] is! Map) {
        improvedConstraints['video'] = {};
      }
      
      final v = Map<String, dynamic>.from(improvedConstraints['video']);
      v['mandatory'] ??= {};
      v['mandatory']['chromeMediaSource'] = 'desktop';
      v['mandatory']['chromeMediaSourceId'] = sourceId;
      improvedConstraints['video'] = v;
    }

    // In den Einstellungen gewählte Geräte (voice_*_device Prefs) anwenden —
    // nur wenn kein Screenshare-Source gesetzt ist (sonst nicht anfassen).
    try {
      final devicePrefs = await VoicePrefs.loadDevices();
      final mic = devicePrefs.mic;
      final cam = devicePrefs.camera;
      final speaker = devicePrefs.speaker;
      if (mic != null &&
          improvedConstraints['audio'] != null &&
          improvedConstraints['audio'] != false) {
        final a = improvedConstraints['audio'] is Map
            ? Map<String, dynamic>.from(improvedConstraints['audio'])
            : <String, dynamic>{};
        a['deviceId'] = mic;
        a['optional'] = [
          ...?(a['optional'] as List?),
          {'sourceId': mic},
        ];
        improvedConstraints['audio'] = a;
      }
      if (cam != null &&
          sourceId == null &&
          improvedConstraints['video'] != null &&
          improvedConstraints['video'] != false) {
        final v = improvedConstraints['video'] is Map
            ? Map<String, dynamic>.from(improvedConstraints['video'])
            : <String, dynamic>{};
        v['deviceId'] = cam;
        improvedConstraints['video'] = v;
      }
      if (speaker != null) {
        rtc.Helper.selectAudioOutput(speaker).catchError((_) {});
      }
    } catch (_) {}

    if (improvedConstraints['video'] != null && improvedConstraints['video'] != false) {
      final String q = _manager.currentQualityKey;
      int width = 1280;
      int height = 720;
      
      if (q == 'sd') { width = 640; height = 360; }
      else if (q == 'fhd') { width = 1920; height = 1080; }
      else if (q == '4k') { width = 3840; height = 2160; }

      if (improvedConstraints['video'] is bool) {
        improvedConstraints['video'] = {
          'width': {'ideal': width},
          'height': {'ideal': height},
          'frameRate': {'ideal': 30},
        };
      } else if (improvedConstraints['video'] is Map) {
        final v = Map<String, dynamic>.from(improvedConstraints['video']);
        v['width'] = {'ideal': width};
        v['height'] = {'ideal': height};
        improvedConstraints['video'] = v;
      }
    }
    return _delegate.getUserMedia(improvedConstraints);
  }

  @override
  Future<rtc.MediaStream> getDisplayMedia(Map<String, dynamic> constraints) async {
    // Android 14+: ohne laufenden mediaProjection-Dienst stürzt die App beim
    // Mitschnitt ab – erst Zustimmung, dann Dienst, dann Mitschnitt.
    if (!kIsWeb && defaultTargetPlatform == TargetPlatform.android) {
      if (!await CallForeground.prepareScreenCapture('voip')) {
        throw Exception('Bildschirmübertragung wurde nicht erlaubt');
      }
    }
    final String? sourceId = _manager._selectedSourceId;
    if (!kIsWeb && defaultTargetPlatform == TargetPlatform.windows && sourceId != null) {
      final desktopConstraints = {
        'video': {
          'mandatory': {
            'chromeMediaSource': 'desktop',
            'chromeMediaSourceId': sourceId,
          },
          'optional': [],
        },
        'audio': false,
      };
      return _delegate.getDisplayMedia(desktopConstraints);
    }
    return _delegate.getDisplayMedia(constraints);
  }

  @override
  Future<List<MediaDeviceInfo>> enumerateDevices() => _delegate.enumerateDevices();
  @override
  MediaTrackSupportedConstraints getSupportedConstraints() => _delegate.getSupportedConstraints();
  @override
  set ondevicechange(Function(dynamic event)? callback) => _delegate.ondevicechange = callback;
  @override
  Function(dynamic event)? get ondevicechange => _delegate.ondevicechange;
  // Erzwungener Override der abstrakten MediaDevices-Klasse, die getSources()
  // selbst als deprecated markiert (Ersatz: enumerateDevices()) aber weiterhin verlangt.
  @override
  // ignore: deprecated_member_use
  Future<List<dynamic>> getSources() => _delegate.getSources();
  @override
  Future<MediaDeviceInfo> selectAudioOutput([AudioOutputOptions? options]) => _delegate.selectAudioOutput(options);
}