import 'dart:async';
import 'dart:math';

import 'package:flutter/foundation.dart';

import '../../mpv/mpv.dart';
import '../../services/settings_service.dart';
import '../../utils/app_logger.dart';
import '../models/sync_message.dart';
import '../models/watch_session.dart';
import '../services/watch_together_peer_service.dart';
import '../services/watch_together_sync_manager.dart';

/// Callback type for when media switches (for guest navigation)
typedef MediaSwitchCallback = void Function(String ratingKey, String serverId, String mediaTitle);

/// Provider for Watch Together functionality
///
/// This provider manages:
/// - Session creation/joining
/// - Peer connections
/// - Playback synchronization
/// - Participant list
/// - Media switching across the session
class WatchTogetherProvider with ChangeNotifier {
  WatchSession? _session;
  WatchTogetherPeerService? _peerService;
  WatchTogetherSyncManager? _syncManager;
  final List<Participant> _participants = [];
  bool _isSyncing = false;
  bool _isDeferredPlay = false;
  String _displayName = 'User';
  String? _lastHandledCurrentPlaybackKey;

  // Coalesce rapid-fire notifyListeners() calls into a single rebuild per frame.
  // During Watch Together join, 4-5 notifications fire within milliseconds;
  // this batches them into one rebuild to avoid overwhelming low-end devices.
  bool _notifyScheduled = false;
  bool _disposed = false;

  @override
  void notifyListeners() {
    if (_disposed || _notifyScheduled) return;
    _notifyScheduled = true;
    scheduleMicrotask(() {
      _notifyScheduled = false;
      if (!_disposed) super.notifyListeners();
    });
  }

  // Host reconnect grace period
  Timer? _hostReconnectTimer;
  bool _isWaitingForHostReconnect = false;
  bool _hostIntentionallyLeft = false;

  // Debounce map for action events (peerId+type → last emission timestamp)
  final Map<String, int> _lastActionEventMs = {};

  /// Generate a random display name for this session
  static String _generateDisplayName() {
    const adjectives = ['Happy', 'Sleepy', 'Sunny', 'Cozy', 'Chill', 'Swift', 'Brave', 'Calm', 'Jolly', 'Lucky'];
    const nouns = ['Panda', 'Koala', 'Fox', 'Owl', 'Cat', 'Dog', 'Bear', 'Bunny', 'Duck', 'Penguin'];
    final random = Random();
    return '${adjectives[random.nextInt(adjectives.length)]} ${nouns[random.nextInt(nouns.length)]}';
  }

  /// Callback for when host switches media (guests should navigate)
  /// Used by MainScreen when VideoPlayerScreen is not active
  MediaSwitchCallback? onMediaSwitched;

  /// Callback for VideoPlayerScreen to handle media switch internally (guest only)
  /// When set, takes priority over onMediaSwitched for proper navigation context
  MediaSwitchCallback? onPlayerMediaSwitched;

  /// Callback for when host exits the video player (guests should exit too)
  VoidCallback? onHostExitedPlayer;

  // Stream subscriptions
  StreamSubscription<String>? _peerConnectedSubscription;
  StreamSubscription<String>? _peerDisconnectedSubscription;
  StreamSubscription<SyncMessage>? _messageSubscription;
  StreamSubscription<PeerError>? _errorSubscription;

  // Getters
  bool get isInSession => _session != null && _session!.state != SessionState.disconnected;
  bool get isHost => _session?.isHost ?? false;
  bool get isConnected => _session?.isConnected ?? false;
  bool get isSyncing => _isSyncing;
  bool get isDeferredPlay => _isDeferredPlay;
  WatchSession? get session => _session;
  List<Participant> get participants => List.unmodifiable(_participants);
  int get participantCount => _participants.length;
  ControlMode get controlMode => _session?.controlMode ?? ControlMode.hostOnly;
  String? get sessionId => _session?.sessionId;
  WatchTogetherSyncManager? get syncManager => _syncManager;
  bool get isWaitingForHostReconnect => _isWaitingForHostReconnect;

  // Participant join/leave event stream
  final StreamController<ParticipantEvent> _participantEventController = StreamController<ParticipantEvent>.broadcast();
  Stream<ParticipantEvent> get participantEvents => _participantEventController.stream;

  // Current media getters
  String? get currentMediaRatingKey => _session?.mediaRatingKey;
  String? get currentMediaServerId => _session?.mediaServerId;
  String? get currentMediaTitle => _session?.mediaTitle;
  bool get hasCurrentPlayback =>
      currentMediaRatingKey != null && currentMediaServerId != null && currentMediaTitle != null;

  /// Set the display name for this user
  void setDisplayName(String name) {
    _displayName = name;
  }

  String? _buildPlaybackKey(String? ratingKey, String? serverId) {
    if (ratingKey == null || serverId == null) return null;
    return '$serverId:$ratingKey';
  }

  void _updateCurrentPlaybackSnapshot({
    required String ratingKey,
    required String serverId,
    required String mediaTitle,
  }) {
    _session = _session?.copyWith(mediaRatingKey: ratingKey, mediaServerId: serverId, mediaTitle: mediaTitle);
  }

  void _clearCurrentPlaybackSnapshot() {
    final session = _session;
    if (session == null) return;

    _session = WatchSession(
      sessionId: session.sessionId,
      role: session.role,
      controlMode: session.controlMode,
      state: session.state,
      errorMessage: session.errorMessage,
      hostPeerId: session.hostPeerId,
    );
    _lastHandledCurrentPlaybackKey = null;
  }

  void _dispatchCurrentPlayback({
    required String ratingKey,
    required String serverId,
    required String mediaTitle,
    required String source,
  }) {
    final callback = onPlayerMediaSwitched ?? onMediaSwitched;
    if (callback == null) {
      appLogger.d('WatchTogether: No media switch callback set, keeping snapshot from $source only');
      return;
    }

    _lastHandledCurrentPlaybackKey = _buildPlaybackKey(ratingKey, serverId);
    appLogger.d('WatchTogether: Dispatching current playback from $source: $mediaTitle');
    callback(ratingKey, serverId, mediaTitle);
  }

  void markCurrentPlaybackHandled({required String ratingKey, required String serverId}) {
    _lastHandledCurrentPlaybackKey = _buildPlaybackKey(ratingKey, serverId);
  }

  void requestCurrentPlaybackSnapshot() {
    if (isHost || _peerService == null || _session == null || _peerService!.myPeerId == null) {
      return;
    }

    final request = SyncMessage.requestSessionConfig(peerId: _peerService!.myPeerId);
    if (_session!.hostPeerId != null) {
      appLogger.d('WatchTogether: Requesting current playback snapshot from host');
      _peerService!.sendTo(_session!.hostPeerId!, request);
    } else {
      appLogger.d('WatchTogether: Host peer unknown, broadcasting current playback snapshot request');
      _peerService!.broadcast(request);
    }
  }

  /// Wire up reconnection handler to re-announce join and readiness after reconnect
  void _wireReconnectHandler() {
    _peerService!.onReconnected = () {
      _syncManager?.announceJoin(_displayName);
      _syncManager?.reannounceReadyIfNeeded();
    };
  }

  /// Wire up sync manager's state change callback to update provider state
  void _wireSyncStateChanges() {
    _syncManager!.onSyncStateChanged = (isSyncing) {
      _isSyncing = isSyncing;
      notifyListeners();
    };
    _syncManager!.onDeferredPlayChanged = (isDeferredPlay) {
      _isDeferredPlay = isDeferredPlay;
      notifyListeners();
    };
  }

  /// Create a new watch together session as host
  Future<String> createSession({
    required ControlMode controlMode,
    String? displayName,
    String? sessionId,
    String? mediaRatingKey,
    String? mediaServerId,
    String? mediaTitle,
  }) async {
    // Clean up any existing session
    await leaveSession();
    _lastHandledCurrentPlaybackKey = null;

    appLogger.d('WatchTogether: Creating session with control mode: $controlMode');

    final customRelayUrl = SettingsService.instanceOrNull?.read(SettingsService.customRelayUrl);
    _peerService = WatchTogetherPeerService(customBaseUrl: customRelayUrl);
    _setupPeerServiceListeners();

    try {
      final createdSessionId = await _peerService!.createSession(sessionId: sessionId);

      _session = WatchSession.createAsHost(
        sessionId: createdSessionId,
        hostPeerId: _peerService!.myPeerId!,
        controlMode: controlMode,
        mediaRatingKey: mediaRatingKey,
        mediaServerId: mediaServerId,
        mediaTitle: mediaTitle,
      ).copyWith(state: SessionState.connected);

      _displayName = displayName ?? _generateDisplayName();
      _participants.add(Participant(peerId: _peerService!.myPeerId!, displayName: _displayName, isHost: true));

      _syncManager = WatchTogetherSyncManager(
        peerService: _peerService!,
        session: _session!,
        displayName: _displayName,
      );

      _wireSyncStateChanges();
      _wireReconnectHandler();

      notifyListeners();
      appLogger.d('WatchTogether: Session created: $createdSessionId');

      return createdSessionId;
    } catch (e) {
      appLogger.e('WatchTogether: Failed to create session', error: e);
      _session = _session?.copyWith(state: SessionState.error, errorMessage: e.toString());
      notifyListeners();
      rethrow;
    }
  }

  /// Join an existing session as guest
  Future<void> joinSession(String sessionId, {String? displayName}) async {
    // Clean up any existing session
    await leaveSession();
    _lastHandledCurrentPlaybackKey = null;

    appLogger.d('WatchTogether: Joining session: $sessionId');

    final customRelayUrl = SettingsService.instanceOrNull?.read(SettingsService.customRelayUrl);
    _peerService = WatchTogetherPeerService(customBaseUrl: customRelayUrl);
    _setupPeerServiceListeners();

    _session = WatchSession.joinAsGuest(sessionId: sessionId);
    notifyListeners();

    try {
      await _peerService!.joinSession(sessionId);

      // Session will be fully configured when we receive sessionConfig from host
      _session = _session!.copyWith(state: SessionState.connected, hostPeerId: 'wt-${sessionId.toUpperCase()}');

      _displayName = displayName ?? _generateDisplayName();

      _syncManager = WatchTogetherSyncManager(
        peerService: _peerService!,
        session: _session!,
        displayName: _displayName,
      );

      _syncManager!.onSessionConfigReceived = (controlMode) {
        _session = _session!.copyWith(controlMode: controlMode);
        _syncManager!.updateSession(_session!);
        notifyListeners();
      };

      _wireSyncStateChanges();
      _wireReconnectHandler();

      // Add self to participants
      _participants.add(Participant(peerId: _peerService!.myPeerId!, displayName: _displayName, isHost: false));

      // Announce join to other participants
      _syncManager!.announceJoin(_displayName);
      requestCurrentPlaybackSnapshot();

      notifyListeners();
      appLogger.d('WatchTogether: Joined session successfully');
    } catch (e) {
      appLogger.e('WatchTogether: Failed to join session', error: e);
      _session = _session?.copyWith(state: SessionState.error, errorMessage: e.toString());
      notifyListeners();
      rethrow;
    }
  }

  /// Enter a room by code — joins if it exists, creates if empty.
  ///
  /// Returns `true` if the user became the host.
  Future<bool> enterRoom(String sessionId, {ControlMode controlMode = ControlMode.anyone, String? displayName}) async {
    // Probe the relay with a lightweight peer service to check room occupancy,
    // then do a single createSession or joinSession. This avoids the crash-prone
    // join→teardown→create cycle on the provider.
    final customRelayUrl = SettingsService.instanceOrNull?.read(SettingsService.customRelayUrl);
    final probe = WatchTogetherPeerService(customBaseUrl: customRelayUrl);
    bool shouldBeHost;
    try {
      await probe.joinSession(sessionId);
      shouldBeHost = probe.connectedPeers.isEmpty;
    } on PeerError catch (e) {
      if (e.serverCode == 'room_not_found') {
        shouldBeHost = true;
      } else {
        await probe.disconnect();
        probe.dispose();
        rethrow;
      }
    }
    await probe.disconnect();
    probe.dispose();

    if (shouldBeHost) {
      await createSession(controlMode: controlMode, displayName: displayName, sessionId: sessionId);
    } else {
      await joinSession(sessionId, displayName: displayName);
    }
    return shouldBeHost;
  }

  /// Leave the current session
  Future<void> leaveSession() async {
    if (_session == null) return;

    appLogger.d('WatchTogether: Leaving session');

    // Announce leave if connected
    _syncManager?.announceLeave();

    // Clean up subscriptions
    unawaited(_peerConnectedSubscription?.cancel());
    unawaited(_peerDisconnectedSubscription?.cancel());
    unawaited(_messageSubscription?.cancel());
    unawaited(_errorSubscription?.cancel());

    _peerConnectedSubscription = null;
    _peerDisconnectedSubscription = null;
    _messageSubscription = null;
    _errorSubscription = null;

    // Cancel host reconnect grace period
    _cancelHostReconnectGracePeriod();

    // Clean up services
    _syncManager?.dispose();
    _syncManager = null;

    await _peerService?.disconnect();
    _peerService?.dispose();
    _peerService = null;

    _session = null;
    _participants.clear();
    _isSyncing = false;
    _isDeferredPlay = false;
    _lastHandledCurrentPlaybackKey = null;
    _lastActionEventMs.clear();
    _hostIntentionallyLeft = false;

    notifyListeners();
    appLogger.d('WatchTogether: Session left');
  }

  /// Attach a player to the sync manager
  void attachPlayer(Player player) {
    if (_syncManager == null) {
      appLogger.w('WatchTogether: Cannot attach player - no sync manager');
      return;
    }

    // Initialize sync manager with existing participants (may have joined before player attached)
    final peerIds = _participants.map((p) => p.peerId).toList();
    _syncManager!.initializeParticipants(peerIds);

    _syncManager!.attachPlayer(player);
    appLogger.d('WatchTogether: Player attached to sync manager');
  }

  /// Detach the player from the sync manager
  void detachPlayer() {
    _syncManager?.detachPlayer();
    appLogger.d('WatchTogether: Player detached from sync manager');
  }

  /// Suppress position sync while the app is backgrounded.
  void setBackgrounded(bool value) {
    _syncManager?.setBackgrounded(value);
  }

  /// Set up listeners for peer service events
  void _setupPeerServiceListeners() {
    _peerConnectedSubscription = _peerService!.onPeerConnected.listen((peerId) {
      appLogger.d('WatchTogether: Peer connected: $peerId');

      // If host reconnected during grace period, cancel the timer
      if (!isHost && peerId == _session?.hostPeerId && _isWaitingForHostReconnect) {
        _cancelHostReconnectGracePeriod();
      }

      if (!isHost && peerId == _session?.hostPeerId) {
        requestCurrentPlaybackSnapshot();
      }

      // Peer will announce themselves with a join message
      notifyListeners();
    });

    _peerDisconnectedSubscription = _peerService!.onPeerDisconnected.listen((peerId) {
      appLogger.d('WatchTogether: Peer disconnected: $peerId');

      // Capture display name before removal for notification
      final disconnectedName = _participants.where((p) => p.peerId == peerId).map((p) => p.displayName).firstOrNull;

      _participants.removeWhere((p) => p.peerId == peerId);
      unawaited(_syncManager?.handlePeerDisconnected(peerId));

      // If host disconnected unexpectedly, start grace period for reconnection.
      // Skip if the host already sent a deliberate leave message.
      if (!isHost && peerId == _session?.hostPeerId && !_hostIntentionallyLeft) {
        _startHostReconnectGracePeriod();
      } else if (disconnectedName != null) {
        _participantEventController.add(
          ParticipantEvent(displayName: disconnectedName, type: ParticipantEventType.left),
        );
      }

      notifyListeners();
    });

    _messageSubscription = _peerService!.onMessageReceived.listen((message) {
      _handleSyncMessage(message);
    });

    _errorSubscription = _peerService!.onError.listen((error) {
      appLogger.e('WatchTogether: Peer error: ${error.message}');

      // Update session state on error
      if (_session != null && _session!.state == SessionState.connected) {
        _session = _session!.copyWith(state: SessionState.error, errorMessage: error.message);
        notifyListeners();
      }
    });
  }

  /// Handle incoming sync messages for participant management
  void _handleSyncMessage(SyncMessage message) {
    switch (message.type) {
      case SyncMessageType.join:
        if (message.peerId != null && message.displayName != null) {
          // Check if participant already exists
          final existingIndex = _participants.indexWhere((p) => p.peerId == message.peerId);
          if (existingIndex >= 0) {
            // Update existing participant
            _participants[existingIndex] = Participant(
              peerId: message.peerId!,
              displayName: message.displayName!,
              isHost: message.isHost ?? false,
            );
          } else {
            // Add new participant
            _participants.add(
              Participant(peerId: message.peerId!, displayName: message.displayName!, isHost: message.isHost ?? false),
            );
            _participantEventController.add(
              ParticipantEvent(displayName: message.displayName!, type: ParticipantEventType.joined),
            );

            // Send our join info back so the new peer adds us to their
            // participant list. Only reply to NEW peers to avoid an
            // infinite join ping-pong (A→join→B→join→A→...).
            if (_peerService != null) {
              _peerService!.sendTo(
                message.peerId!,
                SyncMessage.join(peerId: _peerService!.myPeerId!, displayName: _displayName, isHost: isHost),
              );
            }
          }

          notifyListeners();
        }
        break;

      case SyncMessageType.leave:
        if (message.peerId != null) {
          final leavingName = _participants
              .where((p) => p.peerId == message.peerId)
              .map((p) => p.displayName)
              .firstOrNull;
          _participants.removeWhere((p) => p.peerId == message.peerId);
          if (leavingName != null) {
            _participantEventController.add(
              ParticipantEvent(displayName: leavingName, type: ParticipantEventType.left),
            );
          }

          // If the host deliberately left, end the session for everyone.
          if (!isHost && message.peerId == _session?.hostPeerId) {
            _hostIntentionallyLeft = true;
            _handleHostExitedPlayer(message);
            leaveSession();
          }

          notifyListeners();
        }
        break;

      case SyncMessageType.buffering:
        if (message.peerId != null) {
          final index = _participants.indexWhere((p) => p.peerId == message.peerId);
          if (index >= 0) {
            final newState = message.bufferingState ?? false;
            if (_participants[index].isBuffering != newState) {
              _participants[index] = _participants[index].copyWith(isBuffering: newState);
              if (newState) {
                _emitActionEvent(message.peerId, ParticipantEventType.buffering);
              }
              notifyListeners();
            }
          }
        }
        break;

      case SyncMessageType.positionSync:
        if (message.peerId != null && message.position != null) {
          final index = _participants.indexWhere((p) => p.peerId == message.peerId);
          if (index >= 0) {
            _participants[index] = _participants[index].copyWith(lastKnownPosition: message.position!);
            // Don't notify for position updates - too frequent
          }
        }
        break;

      case SyncMessageType.mediaSwitch:
        _handleMediaSwitch(message);
        break;

      case SyncMessageType.hostExitedPlayer:
        _handleHostExitedPlayer(message);
        break;

      case SyncMessageType.sessionConfig:
        _handleSessionConfig(message);
        break;

      case SyncMessageType.requestSessionConfig:
        // Handled at sync manager level (host responds with config)
        break;

      case SyncMessageType.play:
        _emitActionEvent(message.peerId, ParticipantEventType.resumed);
        break;

      case SyncMessageType.pause:
        _emitActionEvent(message.peerId, ParticipantEventType.paused);
        break;

      case SyncMessageType.seek:
        _emitActionEvent(message.peerId, ParticipantEventType.seeked);
        break;

      default:
        break;
    }
  }

  /// Emit an action event for a remote peer (with 1s debounce per peer+type)
  void _emitActionEvent(String? peerId, ParticipantEventType type) {
    if (peerId == null || peerId == _peerService?.myPeerId) return;

    final key = '$peerId:${type.name}';
    final now = DateTime.now().millisecondsSinceEpoch;
    final last = _lastActionEventMs[key] ?? 0;
    if (now - last < 1000) return;
    _lastActionEventMs[key] = now;

    final name = _participants.where((p) => p.peerId == peerId).map((p) => p.displayName).firstOrNull;
    if (name != null) {
      _participantEventController.add(ParticipantEvent(displayName: name, type: type));
    }
  }

  /// Handle session config from host (guest only)
  /// This is handled at provider level so it's processed even before player is attached
  void _handleSessionConfig(SyncMessage message) {
    if (isHost) return; // Host doesn't need to process config

    if (message.controlMode != null) {
      appLogger.d('WatchTogether: Received session config, controlMode: ${message.controlMode}');
      _session = _session!.copyWith(controlMode: message.controlMode!);
      _syncManager?.updateSession(_session!); // Update sync manager if it exists
      notifyListeners();
    }

    if (message.ratingKey != null && message.serverId != null && message.mediaTitle != null) {
      final playbackKey = _buildPlaybackKey(message.ratingKey, message.serverId);
      final shouldDispatch = playbackKey != _lastHandledCurrentPlaybackKey;

      _updateCurrentPlaybackSnapshot(
        ratingKey: message.ratingKey!,
        serverId: message.serverId!,
        mediaTitle: message.mediaTitle!,
      );
      notifyListeners();

      if (shouldDispatch) {
        _dispatchCurrentPlayback(
          ratingKey: message.ratingKey!,
          serverId: message.serverId!,
          mediaTitle: message.mediaTitle!,
          source: 'session config',
        );
      }
    }
  }

  /// Called when user seeks locally (to broadcast to peers)
  void onLocalSeek(Duration position) {
    _syncManager?.onLocalSeek(position);
  }

  /// Whether the current user can control playback
  bool canControl() {
    if (_session == null) return true; // Not in session, can control
    if (_session!.controlMode == ControlMode.anyone) return true;
    return isHost;
  }

  /// Set the current media (host only) and broadcast to guests
  ///
  /// Call this when the host starts playing new content.
  /// Guests will receive a media switch notification and should navigate.
  void setCurrentMedia({required String ratingKey, required String serverId, required String mediaTitle}) {
    if (!isHost || _session == null || _peerService == null) {
      appLogger.w('WatchTogether: Cannot set media - not host or not in session');
      return;
    }

    appLogger.d('WatchTogether: Host setting current media: $mediaTitle (ratingKey: $ratingKey)');

    // Update session with new media info
    _session = _session!.copyWith(mediaRatingKey: ratingKey, mediaServerId: serverId, mediaTitle: mediaTitle);

    // Broadcast media switch to all guests
    _peerService!.broadcast(
      SyncMessage.mediaSwitch(
        ratingKey: ratingKey,
        serverId: serverId,
        mediaTitle: mediaTitle,
        peerId: _peerService!.myPeerId,
      ),
    );

    notifyListeners();
  }

  /// Handle media switch message from host (guest only)
  void _handleMediaSwitch(SyncMessage message) {
    if (isHost) return; // Host doesn't need to handle their own switch

    if (message.ratingKey == null || message.serverId == null || message.mediaTitle == null) {
      appLogger.w('WatchTogether: Received incomplete media switch message');
      return;
    }

    final playbackKey = _buildPlaybackKey(message.ratingKey, message.serverId);
    final shouldDispatch = playbackKey != _lastHandledCurrentPlaybackKey;

    _updateCurrentPlaybackSnapshot(
      ratingKey: message.ratingKey!,
      serverId: message.serverId!,
      mediaTitle: message.mediaTitle!,
    );
    notifyListeners();

    if (!shouldDispatch) {
      appLogger.d('WatchTogether: Ignoring duplicate media switch for ${message.ratingKey}');
      return;
    }

    appLogger.d('WatchTogether: Received media switch: ${message.mediaTitle}');
    _dispatchCurrentPlayback(
      ratingKey: message.ratingKey!,
      serverId: message.serverId!,
      mediaTitle: message.mediaTitle!,
      source: 'media switch',
    );
  }

  /// Notify guests that host is exiting the video player
  ///
  /// Call this from video player dispose when host exits.
  void notifyHostExitedPlayer() {
    if (!isHost || _session == null || _peerService == null) {
      return;
    }

    appLogger.d('WatchTogether: Host exiting player, notifying guests');

    _peerService!.broadcast(SyncMessage.hostExitedPlayer(peerId: _peerService!.myPeerId));
  }

  /// Handle host exited player message (guest only)
  void _handleHostExitedPlayer(SyncMessage _) {
    if (isHost) return; // Host doesn't need to handle their own exit

    appLogger.d('WatchTogether: Host exited player, callback set: ${onHostExitedPlayer != null}');

    _clearCurrentPlaybackSnapshot();

    // Clear the player callback BEFORE popping so that any mediaSwitch message
    // arriving during the pop animation routes to MainScreen's handler instead
    // of the dying VideoPlayerScreen.
    onPlayerMediaSwitched = null;
    notifyListeners();

    // Trigger callback for the app to navigate guest out of player
    if (onHostExitedPlayer != null) {
      onHostExitedPlayer!.call();
    } else {
      appLogger.w('WatchTogether: onHostExitedPlayer callback not set!');
    }
  }

  /// Start a grace period for host reconnection (guest only)
  void _startHostReconnectGracePeriod() {
    _cancelHostReconnectGracePeriod();
    _isWaitingForHostReconnect = true;
    appLogger.d('WatchTogether: Host disconnected, waiting 15s for reconnection');
    notifyListeners();

    _hostReconnectTimer = Timer(const Duration(seconds: 15), () {
      if (_isWaitingForHostReconnect) {
        appLogger.d('WatchTogether: Host reconnect grace period expired');
        _isWaitingForHostReconnect = false;
        _session = _session?.copyWith(state: SessionState.error, errorMessage: 'Host left the session');
        onHostExitedPlayer?.call();
        notifyListeners();
      }
    });
  }

  /// Cancel host reconnect grace period
  void _cancelHostReconnectGracePeriod() {
    _hostReconnectTimer?.cancel();
    _hostReconnectTimer = null;
    if (_isWaitingForHostReconnect) {
      _isWaitingForHostReconnect = false;
      appLogger.d('WatchTogether: Host reconnected, grace period cancelled');
      notifyListeners();
    }
  }

  @override
  void dispose() {
    _disposed = true;
    _cancelHostReconnectGracePeriod();
    _participantEventController.close();
    leaveSession();
    super.dispose();
  }
}

/// Type of participant event
enum ParticipantEventType { joined, left, paused, resumed, seeked, buffering }

/// Event emitted when a participant joins or leaves
class ParticipantEvent {
  final String displayName;
  final ParticipantEventType type;

  const ParticipantEvent({required this.displayName, required this.type});
}
