import 'dart:async';

import 'package:halkyon_learn_flutter/src/core/asset/data/sound_player.dart';

/// A [SoundPlayer] that plays nothing and notes what it was asked to; a sound
/// plays until stopped or [finish]ed.
class FakeSoundPlayer() implements SoundPlayer {
  final _playing = StreamController<String?>.broadcast();

  /// The paths it was asked to play, in order.
  final played = <String>[];

  /// The file "playing" now.
  String? current;

  /// What playing throws, as for a file the platform can't decode; plays
  /// while null.
  Exception? failPlay;

  @override
  Stream<String?> get playing => _playing.stream;

  @override
  Future<void> play(String path, {required String mimeType}) async {
    if (failPlay case final error?) {
      throw error;
    }
    played.add(path);
    _set(path);
  }

  @override
  Future<void> stop() async => _set(null);

  /// Ends the sound playing, as when it reached its end.
  void finish() => _set(null);

  void _set(String? path) {
    current = path;
    _playing.add(path);
  }

  @override
  Future<void> dispose() => _playing.close();
}