import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:wakelock_plus/wakelock_plus.dart';
import 'package:just_audio/just_audio.dart';

final timerProvider = StateNotifierProvider<TimerNotifier, TimerState>((ref) {
  return TimerNotifier();
});

class TimerState {
  final Duration remaining;
  final bool isRunning;
  final int selectedMinutes;

  TimerState({
    this.remaining = Duration.zero,
    this.isRunning = false,
    this.selectedMinutes = 15, // Default
  });

  TimerState copyWith({
    Duration? remaining,
    bool? isRunning,
    int? selectedMinutes,
  }) {
    return TimerState(
      remaining: remaining ?? this.remaining,
      isRunning: isRunning ?? this.isRunning,
      selectedMinutes: selectedMinutes ?? this.selectedMinutes,
    );
  }
}

class TimerNotifier extends StateNotifier<TimerState> {
  TimerNotifier() : super(TimerState());

  DateTime? _endTime;
  final AudioPlayer _audioPlayer = AudioPlayer();

  void setMinutes(int minutes) {
    state = state.copyWith(selectedMinutes: minutes);
  }

  void start() {
    final duration = Duration(minutes: state.selectedMinutes);
    _endTime = DateTime.now().add(duration);
    state = state.copyWith(remaining: duration, isRunning: true);
    WakelockPlus.enable();

    // Sound vorbereiten (später Asset hinzufügen)
    _audioPlayer.setAsset('assets/sounds/alarm.mp3').catchError((_) {});
  }

  void pause() {
    state = state.copyWith(isRunning: false);
  }

  void stop() {
    state = TimerState(selectedMinutes: state.selectedMinutes); // Reset remaining + running
    _endTime = null;
    WakelockPlus.disable();
    _audioPlayer.stop();
  }

  void tick() {
    if (!state.isRunning || _endTime == null) return;

    final now = DateTime.now();
    if (now.isAfter(_endTime!)) {
      state = state.copyWith(remaining: Duration.zero, isRunning: false);
      WakelockPlus.disable();
      _playAlarm();
      return;
    }

    state = state.copyWith(remaining: _endTime!.difference(now));
  }

  Future<void> _playAlarm() async {
    await _audioPlayer.seek(Duration.zero);
    await _audioPlayer.play();
  }

  @override
  void dispose() {
    WakelockPlus.disable();
    _audioPlayer.dispose();
    super.dispose();
  }
}