import 'package:flutter_riverpod/flutter_riverpod.dart';

/// Models an active reading session for Tilawah
class TilawahSession {
  final int startSurahId;
  final String startSurahName;
  final int startVerseId;

  const TilawahSession({
    required this.startSurahId,
    required this.startSurahName,
    required this.startVerseId,
  });

  TilawahSession copyWith({
    int? startSurahId,
    String? startSurahName,
    int? startVerseId,
  }) {
    return TilawahSession(
      startSurahId: startSurahId ?? this.startSurahId,
      startSurahName: startSurahName ?? this.startSurahName,
      startVerseId: startVerseId ?? this.startVerseId,
    );
  }
}

/// A state notifier to manage the global start state of a reading session.
/// If state is null, no active tracking is occurring.
class TilawahTrackingNotifier extends StateNotifier<TilawahSession?> {
  TilawahTrackingNotifier() : super(null);

  /// Start a new tracking session
  void startTracking({
    required int surahId, 
    required String surahName, 
    required int verseId
  }) {
    state = TilawahSession(
      startSurahId: surahId,
      startSurahName: surahName,
      startVerseId: verseId,
    );
  }

  /// Stop tracking (after recording)
  void stopTracking() {
    state = null;
  }
}

final tilawahTrackingProvider = StateNotifierProvider<TilawahTrackingNotifier, TilawahSession?>((ref) {
  return TilawahTrackingNotifier();
});