import 'dart:io';

import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:pluriwave/estado/estado_busqueda.dart';
import 'package:pluriwave/estado/estado_ecualizador.dart';
import 'package:pluriwave/estado/estado_grabacion.dart';
import 'package:pluriwave/estado/estado_navegacion.dart';
import 'package:pluriwave/estado/estado_radio.dart';
import 'package:pluriwave/l10n/gen/app_localizations.dart';
import 'package:pluriwave/pantallas/pantalla_inicio.dart';
import 'package:provider/provider.dart';
import 'package:shared_preferences/shared_preferences.dart';

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

void main() {
  setUp(() {
    SharedPreferences.setMockInitialValues({});
  });

  // WU6 correction: the 3 scenarios that used to live here ("muestra custom
  // ... favorito usa flujo existente", "permite reintentar manualmente",
  // "PantallaFavoritos muestra custom favorito tras recarga") all depended
  // on `_gridEmisoras`/`_errorBanner`, which task 6.5 relocates to
  // `PantallaBuscar` and DELETES from here (WU5's task 5.9 deferred this
  // cleanup explicitly). Their coverage moved, adapted, to
  // `pantalla_buscar_test.dart` — PantallaInicio no longer renders any
  // station list of its own (only the hero + the "Tus emisoras" favorites
  // preview), so there is nothing left on this screen for those scenarios
  // to exercise.
  testWidgets(
    'WU5 ADR-7 anti-cache: the Escuchar hero reflects a station changed '
    'from OUTSIDE the widget tree (e.g. Android Auto / a notification '
    'action), proving it caches nothing of its own',
    (tester) async {
      _setLargeSurfaceSize(tester);
      final audio = FakeServicioAudio();
      final estado = EstadoRadio(
        audio: audio,
        favoritos: FakeServicioFavoritos(),
        radio: FakeServicioRadio(),
        servicioEcualizador: FakeServicioEcualizador(),
        servicioGrabacion: FakeServicioGrabacionRadio(),
        resolverArchivoCustom: _archivoCustomVacio,
        iniciarAutomaticamente: false,
      );
      addTearDown(estado.dispose);
      await tester.runAsync(estado.inicializar);

      final estacionA = emisoraDemo(uuid: 'a', nombre: 'Estacion A');
      final estacionB = emisoraDemo(uuid: 'b', nombre: 'Estacion B');
      await estado.reproducir(estacionA);

      await tester.pumpWidget(
        _conProviders(estado, _testApp(const PantallaInicio())),
      );
      // Bounded pump, not _pumpStableFrame/pumpAndSettle: a "reproduciendo"
      // station makes VisualizadorAudio start an indeterminately-repeating
      // AnimationController (visualizador_audio.dart:77, `_controller.repeat()`)
      // for its animated-fallback waveform — the same class of hazard as an
      // indeterminate spinner, just via animation. pumpAndSettle() would
      // never return while it keeps scheduling frames.
      await _pumpBounded(tester);

      expect(find.text('Estacion A'), findsOneWidget);

      // Mutates the underlying ServicioAudio DIRECTLY, bypassing
      // EstadoRadio.reproducir() entirely — this is exactly the shape of
      // navegacion_auto.dart's out-of-band mutation (Android Auto's
      // playFromMediaId). EstadoRadio's own audio.estadoStream listener
      // (not this test) is what is expected to pick this up and update
      // emisoraActual.
      await audio.reproducir(estacionB);
      await _pumpBounded(tester);

      expect(find.text('Estacion B'), findsOneWidget);
      expect(find.text('Estacion A'), findsNothing);
    },
  );

  testWidgets('WU5: "Ver todas" switches to the Favoritos root via '
      'EstadoNavegacionRaiz.irA, without pushing a route', (tester) async {
    _setLargeSurfaceSize(tester);
    final favoritos = FakeServicioFavoritos();
    final estado = EstadoRadio(
      audio: FakeServicioAudio(),
      favoritos: favoritos,
      radio: FakeServicioRadio(),
      servicioEcualizador: FakeServicioEcualizador(),
      servicioGrabacion: FakeServicioGrabacionRadio(),
      resolverArchivoCustom: _archivoCustomVacio,
      iniciarAutomaticamente: false,
    );
    addTearDown(estado.dispose);
    await tester.runAsync(estado.inicializar);
    await favoritos.agregar(emisoraDemo(uuid: 'f1', nombre: 'Favorita Uno'));
    await estado.cargarFavoritos();

    final navegacion = EstadoNavegacionRaiz();
    final observer = _RecordingNavigatorObserver();

    await tester.pumpWidget(
      _conProviders(
        estado,
        _testApp(const PantallaInicio(), observers: [observer]),
        navegacion: navegacion,
      ),
    );
    await _pumpStableFrame(tester);
    final pushesAntesDeTocar = observer.pushCount;

    await tester.ensureVisible(find.text('Ver todas'));
    await _pumpStableFrame(tester);
    await tester.tap(find.text('Ver todas'));
    await _pumpStableFrame(tester);

    expect(navegacion.actual, RaizPluriWave.favoritos);
    expect(
      observer.pushCount,
      pushesAntesDeTocar,
      reason: 'switches tabs — must NOT push a new route',
    );
  });
}

/// Mirrors the app.dart wiring: EstadoRadio owns the domain notifiers and
/// the providers only expose the instances (no dispose callbacks).
/// [navegacion] defaults to a fresh [EstadoNavegacionRaiz] — harmless to
/// include for every test, only exercised by the "Ver todas" scenarios.
Widget _conProviders(
  EstadoRadio estado,
  Widget child, {
  EstadoNavegacionRaiz? navegacion,
}) {
  return MultiProvider(
    providers: [
      ChangeNotifierProvider<EstadoRadio>.value(value: estado),
      ListenableProvider<EstadoEcualizador>.value(value: estado.ecualizador),
      ListenableProvider<EstadoGrabacion>.value(value: estado.grabacion),
      ListenableProvider<EstadoBusqueda>.value(value: estado.busqueda),
      ChangeNotifierProvider<EstadoNavegacionRaiz>.value(
        value: navegacion ?? EstadoNavegacionRaiz(),
      ),
    ],
    child: child,
  );
}

Widget _testApp(Widget body, {List<NavigatorObserver> observers = const []}) {
  return MaterialApp(
    locale: const Locale('es'),
    localizationsDelegates: AppLocalizations.localizationsDelegates,
    supportedLocales: AppLocalizations.supportedLocales,
    navigatorObservers: observers,
    home: Scaffold(body: body),
  );
}

/// Counts route pushes so a test can assert "switched tabs, did not push".
class _RecordingNavigatorObserver extends NavigatorObserver {
  int pushCount = 0;

  @override
  void didPush(Route<dynamic> route, Route<dynamic>? previousRoute) {
    pushCount++;
  }
}

Future<void> _pumpStableFrame(WidgetTester tester) async {
  await tester.pump();
  await tester.pumpAndSettle(const Duration(milliseconds: 100));
}

/// WU5: bounded pump, safe when a "reproduciendo" station is rendered —
/// `VisualizadorAudio` starts a repeating `AnimationController` for its
/// animated-fallback waveform in that case, which `pumpAndSettle` (used by
/// `_pumpStableFrame`) would wait on forever.
Future<void> _pumpBounded(WidgetTester tester) async {
  await tester.pump();
  await tester.pump(const Duration(milliseconds: 100));
}

void _setLargeSurfaceSize(WidgetTester tester) {
  tester.view.physicalSize = const Size(1440, 3200);
  tester.view.devicePixelRatio = 1.0;
  addTearDown(tester.view.resetPhysicalSize);
  addTearDown(tester.view.resetDevicePixelRatio);
}

Future<File> _archivoCustomVacio() async =>
    File('${Directory.current.path}/test/fixtures/emisoras_custom_vacio.json');