import 'dart:async';

import 'package:flutter_test/flutter_test.dart';
import 'package:pluriwave/modelos/dispositivo_audio.dart';
import 'package:pluriwave/servicios/servicio_dispositivo_audio.dart';

import '../helpers/fakes.dart';

/// Null (toggle-off) implementation that returns empty data without errors.
/// Represents the behavior when `eqMultiDeviceEnabled` is false.
class NullServicioDispositivoAudio extends ServicioDispositivoAudio {
  @override
  DispositivoAudio? get dispositivoActual => null;

  @override
  Stream<DispositivoAudio> get onDispositivoCambiado => const Stream.empty();

  @override
  Future<DispositivoAudio> obtenerDispositivoActual() async {
    return const DispositivoAudio(
      id: 'builtin_speaker',
      tipo: TipoDispositivo.altavozInterno,
      nombre: 'Speaker',
    );
  }

  @override
  Future<void> dispose() async {}
}

void main() {
  group('Toggle-off path: NullServicioDispositivoAudio', () {
    late NullServicioDispositivoAudio servicio;

    setUp(() {
      servicio = NullServicioDispositivoAudio();
    });

    test('dispositivoActual is always null', () {
      expect(servicio.dispositivoActual, isNull);
    });

    test('onDispositivoCambiado emits no events', () async {
      final received = <DispositivoAudio>[];
      final sub = servicio.onDispositivoCambiado.listen(received.add);
      await Future<void>.delayed(const Duration(milliseconds: 10));
      await sub.cancel();
      expect(received, isEmpty);
    });

    test('obtenerDispositivoActual returns fallback builtin_speaker', () async {
      final device = await servicio.obtenerDispositivoActual();
      expect(device.id, 'builtin_speaker');
      expect(device.tipo, TipoDispositivo.altavozInterno);
    });

    test('dispose completes without error', () async {
      await expectLater(servicio.dispose(), completes);
    });

    test('no platform channel code is invoked (fake, not real)', () async {
      // Verify that FakeServicioDispositivoAudio also produces no events
      // when no emitirDispositivo is called — simulating toggle-off behavior.
      final fake = FakeServicioDispositivoAudio();
      final received = <DispositivoAudio>[];
      final sub = fake.onDispositivoCambiado.listen(received.add);
      await Future<void>.delayed(const Duration(milliseconds: 10));
      await sub.cancel();
      expect(received, isEmpty);
      await fake.dispose();
    });
  });
}