/// Represents a push notification received from the backend.
class AppNotification {
  final String id;
  final String type; // alert, approval, task_complete, message
  final String title;
  final String body;
  final String? actionRoute; // deep link path, e.g. '/alerts'
  final DateTime receivedAt;
  final bool isRead;

  const AppNotification({
    required this.id,
    required this.type,
    required this.title,
    required this.body,
    this.actionRoute,
    required this.receivedAt,
    this.isRead = false,
  });

  AppNotification copyWith({bool? isRead}) {
    return AppNotification(
      id: id,
      type: type,
      title: title,
      body: body,
      actionRoute: actionRoute,
      receivedAt: receivedAt,
      isRead: isRead ?? this.isRead,
    );
  }

  factory AppNotification.fromJson(Map<String, dynamic> json) {
    return AppNotification(
      id: json['id'] as String? ?? DateTime.now().millisecondsSinceEpoch.toString(),
      type: json['type'] as String? ?? 'message',
      title: json['title'] as String? ?? json['content'] as String? ?? '',
      body: json['body'] as String? ?? json['content'] as String? ?? '',
      actionRoute: json['actionRoute'] as String?,
      receivedAt: json['receivedAt'] != null
          ? DateTime.parse(json['receivedAt'] as String)
          : (json['sentAt'] != null
              ? DateTime.parse(json['sentAt'] as String)
              : DateTime.now()),
      isRead: json['isRead'] as bool? ?? false,
    );
  }
}