import 'dart:async';

import 'package:comunic/models/comment.dart';
import 'package:event_bus/event_bus.dart';

/// Events helper
///
/// @author Pierre Hubert

/// Main WebSocket closed
class WSClosedEvent {}

/// New number of notifications
class NewNumberNotifsEvent {
  final int newNum;

  NewNumberNotifsEvent(this.newNum);
}

/// New number of unread conversations
class NewNumberUnreadConversations {
  final int newNum;

  NewNumberUnreadConversations(this.newNum);
}

/// New comment
class NewCommentEvent {
  final Comment comment;

  NewCommentEvent(this.comment);
}

/// Updated comment
class UpdatedCommentEvent {
  final Comment comment;

  UpdatedCommentEvent(this.comment);
}

class EventsHelper {
  static EventBus _mgr = EventBus();

  /// Listen to event
  ///
  /// Do not use this method directly. You should instead prefer to use
  /// [SafeState.listen] to handle safely widgets lifecycle...
  ///
  /// You can not register to global events
  static StreamSubscription<T> on<T>(void onData(T event)) {
    if (T == dynamic) throw Exception("Do not register to all events!");

    final stream = _mgr.on<T>();
    return stream.listen(onData);
  }

  /// Propagate an event
  static void emit<T>(T event) {
    _mgr.fire(event);
  }
}