class QueuedMessage {
  final String id;
  final String topic;
  final Map<String, dynamic> payload;
  final DateTime createdAt;
  final int retryCount;

  QueuedMessage({
    required this.id,
    required this.topic,
    required this.payload,
    required this.createdAt,
    this.retryCount = 0,
  });

  factory QueuedMessage.fromJson(Map<String, dynamic> json) {
    return QueuedMessage(
      id: json['id'],
      topic: json['topic'],
      payload: Map<String, dynamic>.from(json['payload']),
      createdAt: DateTime.parse(json['createdAt']),
      retryCount: json['retryCount'] ?? 0,
    );
  }

  Map<String, dynamic> toJson() {
    return {
      'id': id,
      'topic': topic,
      'payload': payload,
      'createdAt': createdAt.toIso8601String(),
      'retryCount': retryCount,
    };
  }

  QueuedMessage copyWith({
    String? id,
    String? topic,
    Map<String, dynamic>? payload,
    DateTime? createdAt,
    int? retryCount,
  }) {
    return QueuedMessage(
      id: id ?? this.id,
      topic: topic ?? this.topic,
      payload: payload ?? this.payload,
      createdAt: createdAt ?? this.createdAt,
      retryCount: retryCount ?? this.retryCount,
    );
  }
}