import 'dart:async';
import 'package:audioplayers/audioplayers.dart';
import 'package:pad_scanner/services/app_config_service.dart';

class SoundService {
  static const _keySuccess = 'sound_success';
  static const _keyFailure = 'sound_failure';
  static const _keyBeep = 'sound_beep';
  static const _keyError = 'sound_error';
  static const _keyAlert = 'sound_alert';

  final _player = AudioPlayer();
  final _alertPlayer = AudioPlayer();
  final _configService = AppConfigService();

  Timer? _alertTimer;

  // --- Path getters ---

  Future<String?> getSuccessPath() =>
      _configService.getString(_keySuccess);

  Future<String?> getFailurePath() =>
      _configService.getString(_keyFailure);

  Future<String?> getBeepPath() =>
      _configService.getString(_keyBeep);

  Future<String?> getErrorPath() =>
      _configService.getString(_keyError);

  Future<String?> getAlertPath() =>
      _configService.getString(_keyAlert);

  // --- Path setters ---

  Future<void> setSuccessPath(String? path) =>
      _setConfigPath(_keySuccess, path);

  Future<void> setFailurePath(String? path) =>
      _setConfigPath(_keyFailure, path);

  Future<void> setBeepPath(String? path) =>
      _setConfigPath(_keyBeep, path);

  Future<void> setErrorPath(String? path) =>
      _setConfigPath(_keyError, path);

  Future<void> setAlertPath(String? path) =>
      _setConfigPath(_keyAlert, path);

  Future<void> _setConfigPath(String key, String? path) async {
    if (path != null) {
      await _configService.setString(key, path);
    } else {
      final config = await _configService.loadConfig();
      config.remove(key);
    }
  }

  // --- Playback methods ---

  Future<void> playSuccess() async {
    final path = await getSuccessPath();
    if (path != null) {
      await _player.play(DeviceFileSource(path));
    }
  }

  Future<void> playFailure() async {
    final path = await getFailurePath();
    if (path != null) {
      await _player.play(DeviceFileSource(path));
    }
  }

  Future<void> playBeep() async {
    final path = await getBeepPath();
    if (path != null) {
      await _player.play(DeviceFileSource(path));
    }
  }

  Future<void> playError() async {
    final path = await getErrorPath();
    if (path != null) {
      await _player.play(DeviceFileSource(path));
    }
  }

  /// Play alert sound in a loop until [stopAlert] is called.
  /// Loops up to 10 times as a safety guard (~15 seconds max).
  Future<void> playAlertLoop() async {
    final path = await getAlertPath();
    if (path == null) return;

    _alertTimer?.cancel();
    var count = 0;
    _alertTimer = Timer.periodic(const Duration(milliseconds: 1500), (_) async {
      if (count >= 10) {
        _alertTimer?.cancel();
        return;
      }
      await _alertPlayer.play(DeviceFileSource(path));
      count++;
    });
    // Play immediately first time
    await _alertPlayer.play(DeviceFileSource(path));
    count++;
  }

  /// Stop the alert loop.
  void stopAlert() {
    _alertTimer?.cancel();
    _alertTimer = null;
    _alertPlayer.stop();
  }

  Future<void> play(String path) async {
    await _player.play(DeviceFileSource(path));
  }

  Future<void> dispose() async {
    _alertTimer?.cancel();
    await _player.dispose();
    await _alertPlayer.dispose();
  }
}