import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:in_app_purchase/in_app_purchase.dart';
import 'package:pluriwave/estado/estado_entitlement.dart';
import 'package:pluriwave/l10n/gen/app_localizations.dart';
import 'package:pluriwave/servicios/servicio_compras.dart';
import 'package:pluriwave/widgets/hoja_premium.dart';
import 'package:provider/provider.dart';
import 'package:shared_preferences/shared_preferences.dart';

/// fix/import-alarmas-y-paywall: a purchase sheet the user cannot escape is
/// a dark pattern and a Play policy risk. These cover the dismiss
/// affordance, the honest/concrete feature list, and the equalizer guard
/// (the phone equalizer is free for everyone and must never be presented as
/// a premium feature — this has regressed conceptually before).

/// Fake [PuertoCompras] (mirrors `app_test.dart`'s own fake): lets a test
/// drive [EstadoEntitlement]'s purchase-stream events without touching
/// `in_app_purchase`.
class _PuertoComprasFalso implements PuertoCompras {
  final _eventos = StreamController<EventoCompra>.broadcast();

  @override
  Stream<EventoCompra> get eventos => _eventos.stream;

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

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

  void emitir(EventoCompra evento) => _eventos.add(evento);

  Future<void> dispose() => _eventos.close();
}

/// Fake [InAppPurchase]: permite montar el paywall sobre el
/// `ServicioComprasPlayBilling` REAL (no un `PuertoCompras` falso) para cubrir
/// el bloqueo del paywall de extremo a extremo. `noSuchMethod` cubre el resto
/// de la API del plugin, que este test no ejercita.
class _InAppPurchaseFalso implements InAppPurchase {
  final _compras = StreamController<List<PurchaseDetails>>.broadcast();

  @override
  Stream<List<PurchaseDetails>> get purchaseStream => _compras.stream;

  @override
  Future<void> restorePurchases({String? applicationUserName}) async {
    // Play Billing publica un lote VACÍO cuando no hay nada que restaurar.
    _compras.add(const <PurchaseDetails>[]);
  }

  Future<void> dispose() => _compras.close();

  @override
  dynamic noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
}

/// FIX 3 / FIX 9 (code review): the paywall must show localized feedback for
/// a failed purchase/restore, a distinct non-error confirmation when a
/// restore finds nothing, and its own dedicated "premium active" string
/// instead of reusing the equalizer's `equalizerActive` translation.
void main() {
  setUp(() {
    SharedPreferences.setMockInitialValues({});
  });

  late AppLocalizations l10n;

  Future<EstadoEntitlement> bombear(
    WidgetTester tester, {
    required _PuertoComprasFalso compras,
  }) async {
    late EstadoEntitlement estado;
    await tester.pumpWidget(
      MultiProvider(
        providers: [
          ChangeNotifierProvider<EstadoEntitlement>(
            create: (_) {
              estado = EstadoEntitlement(prefs: null, compras: compras);
              return estado;
            },
          ),
        ],
        child: MaterialApp(
          locale: const Locale('es'),
          localizationsDelegates: AppLocalizations.localizationsDelegates,
          supportedLocales: AppLocalizations.supportedLocales,
          home: const Scaffold(body: HojaPremium()),
        ),
      ),
    );
    await tester.pump();
    l10n = AppLocalizations.of(tester.element(find.byType(HojaPremium)));
    return estado;
  }

  /// Presents `HojaPremium` through the REAL `mostrarHojaPremium` modal
  /// route (unlike [bombear], which embeds it directly with no route to
  /// pop) so the dismiss controls can be exercised end-to-end exactly as a
  /// user would encounter them.
  Future<void> bombearComoHoja(
    WidgetTester tester, {
    required _PuertoComprasFalso compras,
  }) async {
    await tester.pumpWidget(
      MultiProvider(
        providers: [
          ChangeNotifierProvider<EstadoEntitlement>(
            create: (_) => EstadoEntitlement(prefs: null, compras: compras),
          ),
        ],
        child: MaterialApp(
          locale: const Locale('es'),
          localizationsDelegates: AppLocalizations.localizationsDelegates,
          supportedLocales: AppLocalizations.supportedLocales,
          home: Builder(
            builder:
                (context) => Scaffold(
                  body: TextButton(
                    onPressed: () => mostrarHojaPremium(context),
                    child: const Text('abrir'),
                  ),
                ),
          ),
        ),
      ),
    );
    await tester.pump();
    await tester.tap(find.text('abrir'));
    await tester.pumpAndSettle();
    l10n = AppLocalizations.of(tester.element(find.byType(HojaPremium)));
  }

  group('fix/import-alarmas-y-paywall — dismissibility', () {
    testWidgets('the close (X) control closes the sheet without purchasing or '
        'restoring', (tester) async {
      final compras = _PuertoComprasFalso();
      addTearDown(compras.dispose);
      await bombearComoHoja(tester, compras: compras);

      expect(find.byType(HojaPremium), findsOneWidget);

      await tester.tap(find.byKey(const ValueKey('hoja-premium-cerrar')));
      await tester.pumpAndSettle();

      expect(find.byType(HojaPremium), findsNothing);
    });

    testWidgets(
      'the "not now" secondary action closes the sheet without purchasing '
      'or restoring',
      (tester) async {
        final compras = _PuertoComprasFalso();
        addTearDown(compras.dispose);
        await bombearComoHoja(tester, compras: compras);

        expect(find.byType(HojaPremium), findsOneWidget);

        await tester.tap(find.byKey(const ValueKey('hoja-premium-ahora-no')));
        await tester.pumpAndSettle();

        expect(find.byType(HojaPremium), findsNothing);
      },
    );

    testWidgets('the system back gesture also closes the sheet (default '
        'isDismissible/enableDrag, no PopScope blocking it)', (tester) async {
      final compras = _PuertoComprasFalso();
      addTearDown(compras.dispose);
      await bombearComoHoja(tester, compras: compras);

      expect(find.byType(HojaPremium), findsOneWidget);

      await tester.binding.handlePopRoute();
      await tester.pumpAndSettle();

      expect(find.byType(HojaPremium), findsNothing);
    });

    testWidgets(
      'an already-premium user still gets the close control (no decline '
      'needed) and no "not now" button',
      (tester) async {
        SharedPreferences.setMockInitialValues({'compra_premium_v1': true});
        final compras = _PuertoComprasFalso();
        addTearDown(compras.dispose);
        await bombearComoHoja(tester, compras: compras);

        expect(
          find.byKey(const ValueKey('hoja-premium-cerrar')),
          findsOneWidget,
        );
        expect(
          find.byKey(const ValueKey('hoja-premium-ahora-no')),
          findsNothing,
        );
      },
    );
  });

  group('fix/import-alarmas-y-paywall — honest, concrete copy', () {
    testWidgets('lists the 5 features premium actually unlocks', (
      tester,
    ) async {
      final compras = _PuertoComprasFalso();
      addTearDown(compras.dispose);
      await bombear(tester, compras: compras);

      expect(find.text(l10n.premiumBeneficioSinAnuncios), findsOneWidget);
      expect(find.text(l10n.premiumBeneficioAndroidAuto), findsOneWidget);
      expect(find.text(l10n.premiumBeneficioGrabacion), findsOneWidget);
      expect(find.text(l10n.premiumBeneficioVacaciones), findsOneWidget);
      expect(find.text(l10n.premiumBeneficioAlarmasIlimitadas), findsOneWidget);
    });

    testWidgets('states this is a one-time purchase, not a subscription', (
      tester,
    ) async {
      final compras = _PuertoComprasFalso();
      addTearDown(compras.dispose);
      await bombear(tester, compras: compras);

      expect(find.text(l10n.premiumPagoUnico), findsOneWidget);
    });

    testWidgets(
      'GUARD: the phone equalizer is never presented as a premium feature',
      (tester) async {
        final compras = _PuertoComprasFalso();
        addTearDown(compras.dispose);
        await bombear(tester, compras: compras);

        expect(find.text(l10n.equalizerTitle), findsNothing);
        expect(find.text(l10n.equalizerActive), findsNothing);
        expect(find.textContaining('cualizador'), findsNothing);
        expect(find.textContaining('qualizer'), findsNothing);
      },
    );
  });

  group(
    'FIX 9 — la etiqueta de premium activo es propia, no la del ecualizador',
    () {
      testWidgets(
        'usuario premium: muestra l10n.premiumActivo, nunca l10n.equalizerActive',
        (tester) async {
          SharedPreferences.setMockInitialValues({'compra_premium_v1': true});
          final compras = _PuertoComprasFalso();
          addTearDown(compras.dispose);
          await bombear(tester, compras: compras);
          await tester.pump();

          expect(find.text(l10n.premiumActivo), findsOneWidget);
          expect(find.text(l10n.equalizerActive), findsNothing);
        },
      );
    },
  );

  group('FIX 3 — feedback de error/restauración en el paywall', () {
    testWidgets('un error de compra muestra el mensaje localizado genérico '
        '(l10n.compraError), nunca el texto interno de EventoCompra.mensaje', (
      tester,
    ) async {
      final compras = _PuertoComprasFalso();
      addTearDown(compras.dispose);
      await bombear(tester, compras: compras);

      compras.emitir(
        const EventoCompra(
          TipoEventoCompra.error,
          mensaje: 'Producto no encontrado en Play Console',
        ),
      );
      await tester.pump();
      await tester.pump();

      expect(find.text(l10n.compraError), findsOneWidget);
      expect(find.text('Producto no encontrado en Play Console'), findsNothing);
    });

    testWidgets('una restauración sin compras muestra su propia confirmación '
        '(l10n.restauracionSinCompras), distinta del mensaje de error', (
      tester,
    ) async {
      final compras = _PuertoComprasFalso();
      addTearDown(compras.dispose);
      await bombear(tester, compras: compras);

      compras.emitir(const EventoCompra(TipoEventoCompra.noEncontrada));
      await tester.pump();
      await tester.pump();

      expect(find.text(l10n.restauracionSinCompras), findsOneWidget);
      expect(find.text(l10n.compraError), findsNothing);
    });

    testWidgets(
      'descartar el mensaje de error llama a consumirResultadoUsuario() y '
      'lo oculta de la UI',
      (tester) async {
        final compras = _PuertoComprasFalso();
        addTearDown(compras.dispose);
        final estado = await bombear(tester, compras: compras);

        compras.emitir(const EventoCompra(TipoEventoCompra.error));
        await tester.pump();
        await tester.pump();
        expect(find.text(l10n.compraError), findsOneWidget);

        await tester.tap(
          find.byKey(const ValueKey('hoja-premium-resultado-descartar')),
        );
        await tester.pump();

        expect(find.text(l10n.compraError), findsNothing);
        expect(estado.resultadoUsuario, isNull);
      },
    );
  });

  group('bloqueo del paywall — "Restaurar compras" sin compras previas', () {
    testWidgets('extremo a extremo (ServicioComprasPlayBilling real): un lote '
        'vacío reactiva AMBOS botones, comprar y restaurar', (tester) async {
      final iap = _InAppPurchaseFalso();
      addTearDown(iap.dispose);
      final servicio = ServicioComprasPlayBilling(inAppPurchase: iap);
      addTearDown(servicio.dispose);

      await tester.pumpWidget(
        MultiProvider(
          providers: [
            ChangeNotifierProvider<EstadoEntitlement>(
              create:
                  (_) => EstadoEntitlement(prefs: null, compras: servicio),
            ),
          ],
          child: MaterialApp(
            locale: const Locale('es'),
            localizationsDelegates: AppLocalizations.localizationsDelegates,
            supportedLocales: AppLocalizations.supportedLocales,
            home: const Scaffold(body: HojaPremium()),
          ),
        ),
      );
      await tester.pump();
      l10n = AppLocalizations.of(tester.element(find.byType(HojaPremium)));

      final restaurar = find.byKey(const ValueKey('hoja-premium-restaurar'));
      final comprar = find.byKey(const ValueKey('hoja-premium-comprar'));

      await tester.tap(restaurar);
      await tester.pump();
      await tester.pump();

      // El botón sigue vivo: si `noEncontrada` nunca llega, `compraEnCurso`
      // se queda en `true` y el usuario no puede pagar nunca más.
      expect(
        tester.widget<OutlinedButton>(restaurar).onPressed,
        isNotNull,
        reason: 'restaurar debe volver a estar habilitado',
      );
      expect(
        tester.widget<FilledButton>(comprar).onPressed,
        isNotNull,
        reason: 'comprar debe volver a estar habilitado',
      );
      expect(find.text(l10n.restauracionSinCompras), findsOneWidget);
    });
  });
}