import '../utils/app_time.dart';

/// A cross-device face verification session.
///
/// Created on web when no camera is detected. The web client generates a QR
/// code containing the session ID. The mobile client scans the QR, performs
/// liveness detection, uploads the photo, and marks the session completed.
class VerificationSession {
  VerificationSession({
    required this.id,
    required this.userId,
    required this.type,
    this.contextId,
    this.status = 'pending',
    this.imageUrl,
    required this.createdAt,
    required this.expiresAt,
  });

  final String id;
  final String userId;
  final String type; // 'enrollment' or 'verification'
  final String? contextId; // e.g. attendance_log_id
  final String status; // 'pending', 'completed', 'expired'
  final String? imageUrl;
  final DateTime createdAt;
  final DateTime expiresAt;

  bool get isPending => status == 'pending';
  bool get isCompleted => status == 'completed';
  bool get isExpired =>
      status == 'expired' || DateTime.now().toUtc().isAfter(expiresAt);

  factory VerificationSession.fromMap(Map<String, dynamic> map) {
    return VerificationSession(
      id: map['id'] as String,
      userId: map['user_id'] as String,
      type: map['type'] as String,
      contextId: map['context_id'] as String?,
      status: (map['status'] as String?) ?? 'pending',
      imageUrl: map['image_url'] as String?,
      createdAt: AppTime.parse(map['created_at'] as String),
      expiresAt: AppTime.parse(map['expires_at'] as String),
    );
  }

  Map<String, dynamic> toJson() {
    return {
      'user_id': userId,
      'type': type,
      if (contextId != null) 'context_id': contextId,
    };
  }
}