import 'dart:async';
import 'dart:io';

import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:pluriwave/estado/estado_ecualizador.dart';
import 'package:pluriwave/estado/estado_grabacion.dart';
import 'package:pluriwave/estado/estado_idioma.dart';
import 'package:pluriwave/estado/estado_radio.dart';
import 'package:pluriwave/l10n/gen/app_localizations.dart';
import 'package:pluriwave/modelos/archivo_grabacion.dart';
import 'package:pluriwave/pantallas/pantalla_ajustes.dart';
import 'package:pluriwave/servicios/servicio_grabacion_radio.dart';
import 'package:provider/provider.dart';
import 'package:shared_preferences/shared_preferences.dart';

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

/// S8 (Tier 1 visual fidelity): the prototype puts a trailing "current
/// value" on nearly every settings row (t4 lines 512-539, 625 — e.g.
/// "3 guardados", "Alfabético", "Español", "7 · 84 MB"). Wires 8 of the 12
/// built rows to real, already-available state. The other 4 (Salida de
/// audio, Música local, Backup, Info's version) are deliberately left
/// without a value — see the apply-progress note for why each lacks a
/// low-risk, deterministically-testable data source.
///
/// Pre-existing project constraint (see `pantalla_ajustes_test.dart`):
/// PluriGlassSurface paints a background over ListTile's ink layer, which
/// Flutter flags as a warning-level assertion, not a correctness bug.
void _suppressListTileInkAssertion() {
  final original = FlutterError.onError;
  FlutterError.onError = (details) {
    if (details.exceptionAsString().contains(
      'ListTile background color or ink splashes may be invisible',
    )) {
      return;
    }
    original?.call(details);
  };
  addTearDown(() => FlutterError.onError = original);
}

/// Returns a fixed, in-memory recordings list — `listarGrabaciones()`'s real
/// implementation touches the filesystem directly (`Directory.listSync`),
/// which the project's own convention forbids exercising bare in a widget
/// test.
class _FakeServicioGrabacionConArchivos extends ServicioGrabacionRadio {
  final _controller = StreamController<EstadoGrabacionRadio>.broadcast();

  @override
  EstadoGrabacionRadio get estado => const EstadoGrabacionRadio.inactiva();

  @override
  Stream<EstadoGrabacionRadio> get estadoStream => _controller.stream;

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

  @override
  Future<List<ArchivoGrabacion>> listarGrabaciones() async => [
    ArchivoGrabacion(
      ruta: '/a.m4a',
      nombre: 'a',
      fecha: DateTime(2026, 1, 1),
      tamanoBytes: 2 * 1024 * 1024,
    ),
    ArchivoGrabacion(
      ruta: '/b.m4a',
      nombre: 'b',
      fecha: DateTime(2026, 1, 2),
      tamanoBytes: 5 * 1024 * 1024,
    ),
  ];

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

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

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

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

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

  Widget buildAjustes(EstadoRadio estado, EstadoIdioma idioma) {
    return MultiProvider(
      providers: [
        ChangeNotifierProvider<EstadoRadio>.value(value: estado),
        ListenableProvider<EstadoEcualizador>.value(value: estado.ecualizador),
        ListenableProvider<EstadoGrabacion>.value(value: estado.grabacion),
        ChangeNotifierProvider<EstadoIdioma>.value(value: idioma),
      ],
      child: MaterialApp(
        locale: const Locale('en'),
        localizationsDelegates: AppLocalizations.localizationsDelegates,
        supportedLocales: AppLocalizations.supportedLocales,
        home: const Scaffold(body: PantallaAjustes()),
      ),
    );
  }

  testWidgets('settings rows show their current value: EQ on, favourite groups '
      'count, preferred station name, custom stations count, sort order, '
      'recordings count · size, and the current language', (tester) async {
    setLargeSurface(tester);
    _suppressListTileInkAssertion();

    final estado = EstadoRadio(
      audio: FakeServicioAudio(),
      favoritos: FakeServicioFavoritos(),
      radio: FakeServicioRadio(),
      servicioEcualizador: FakeServicioEcualizador(),
      servicioGrabacion: _FakeServicioGrabacionConArchivos(),
      resolverArchivoCustom: archivoCustomVacio,
      iniciarAutomaticamente: false,
    );
    addTearDown(estado.dispose);
    await estado.ecualizador.cargarPersistido();
    await estado.ecualizador.cambiarActivo(true);

    final favoritos = estado.favoritos as FakeServicioFavoritos;
    await favoritos.crearGrupo('Rock');
    await favoritos.crearGrupo('Jazz');
    await estado.cargarGruposFavoritos();

    final preferida = emisoraDemo(uuid: 'pref-1', nombre: 'Radio Horizonte');
    await favoritos.agregar(preferida);
    await estado.cargarFavoritos();
    await estado.cambiarEmisoraPreferida(preferida);
    await estado.ordenarFavoritos(OrdenEmisoras.calidad);

    final idioma = EstadoIdioma();
    // EstadoIdioma's constructor kicks off its own async `_cargar()` read
    // from SharedPreferences; without waiting for it to settle first, it
    // can resolve AFTER `seleccionarLocale` below and clobber the
    // selection back to null (a real race, not a test flake). `tester.
    // pump()`, NOT a bare `Future.delayed` — a real Timer/delay never
    // fires inside `testWidgets`' fake-async zone without something
    // driving fake time forward, and hangs the whole test.
    await tester.pump();
    await idioma.seleccionarLocale(const Locale('en'));

    await tester.pumpWidget(buildAjustes(estado, idioma));
    await pumpStable(tester);
    // Lets the recordings FutureBuilder resolve.
    await tester.pump();

    final l10n = await AppLocalizations.delegate.load(const Locale('en'));

    expect(find.text(l10n.equalizerActive), findsOneWidget);
    // 3, not 2 — FakeServicioFavoritos seeds a protected "unassigned"
    // group by default, on top of the 2 this test creates.
    expect(find.text('3'), findsOneWidget); // favourite groups
    expect(find.text('Radio Horizonte'), findsOneWidget);
    expect(find.text(l10n.stationOrderByQuality), findsOneWidget);
    expect(find.text('2 · 7 MB'), findsOneWidget);
    expect(find.text('English'), findsOneWidget);
  });
}