import '../models/question.dart';

/// A single attempt/quiz session.
class Attempt {
  /// Unique identifier for this attempt.
  final String id;

  /// List of questions included in this attempt.
  final List<Question> questions;

  /// Timestamp when the attempt was started (milliseconds since epoch).
  final int startTime;

  const Attempt({
    required this.id,
    required this.questions,
    required this.startTime,
  });

  /// Creates a copy of this attempt with the given fields replaced.
  Attempt copyWith({
    String? id,
    List<Question>? questions,
    int? startTime,
  }) {
    return Attempt(
      id: id ?? this.id,
      questions: questions ?? this.questions,
      startTime: startTime ?? this.startTime,
    );
  }

  /// Number of questions in this attempt.
  int get questionCount => questions.length;
}