import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:pluriwave/estado/estado_navegacion.dart';
import 'package:pluriwave/l10n/gen/app_localizations.dart';
import 'package:pluriwave/pantallas/pantalla_bienvenida.dart';
import 'package:provider/provider.dart';

/// WU17: `onboarding-welcome` spec — full-screen route (not a modal),
/// content only (logo/headline/body/3 bullets/1 CTA), binding
/// no-monetization guard, and CTA dismisses to Escuchar with the route
/// popped.
Widget _app({required EstadoNavegacionRaiz navegacion}) {
  return ChangeNotifierProvider<EstadoNavegacionRaiz>.value(
    value: navegacion,
    child: const MaterialApp(
      locale: Locale('es'),
      localizationsDelegates: AppLocalizations.localizationsDelegates,
      supportedLocales: AppLocalizations.supportedLocales,
      home: PantallaBienvenida(),
    ),
  );
}

void main() {
  testWidgets(
    'renders as a full-screen route with a logo, headline, body copy, '
    'exactly 3 feature bullets, and exactly one primary CTA',
    (tester) async {
      final navegacion = EstadoNavegacionRaiz();
      addTearDown(navegacion.dispose);

      await tester.pumpWidget(_app(navegacion: navegacion));
      await tester.pumpAndSettle();

      // A full-screen route, never a modal dialog.
      expect(find.byType(Dialog), findsNothing);
      expect(find.byType(AlertDialog), findsNothing);
      expect(find.byType(Scaffold), findsOneWidget);

      // Audit 14.1 adds a second Image (the blurred backdrop), so "the
      // logo mark" is now asserted by key rather than "the only Image".
      expect(
        find.byKey(const ValueKey('welcome-logo')),
        findsOneWidget,
        reason: 'the logo mark',
      );
      expect(find.text('Tu mundo, en directo'), findsOneWidget);
      expect(
        find.textContaining('53.412 emisoras de 238 países'),
        findsOneWidget,
      );
      expect(
        find.byType(FilaCaracteristicaBienvenida),
        findsNWidgets(3),
        reason: 'exactly 3 feature bullets',
      );
      expect(
        find.byType(FilledButton),
        findsOneWidget,
        reason: 'exactly 1 primary CTA',
      );
      expect(find.text('Empezar a escuchar'), findsOneWidget);
    },
  );

  testWidgets(
    'visual fidelity (audit 14.4/14.5): body copy is 14.5px, bullet titles '
    'are 13.5px/w800, bullet subtitles are 11.5px (t4 lines 697/700-702)',
    (tester) async {
      final navegacion = EstadoNavegacionRaiz();
      addTearDown(navegacion.dispose);

      await tester.pumpWidget(_app(navegacion: navegacion));
      await tester.pumpAndSettle();

      final l10n = lookupAppLocalizations(const Locale('es'));

      final body = tester.widget<Text>(
        find.textContaining('53.412 emisoras de 238 países'),
      );
      expect(body.style?.fontSize, 14.5);

      final tituloBullet = tester.widget<Text>(
        find.text(l10n.welcomeBullet1Title),
      );
      expect(tituloBullet.style?.fontSize, 13.5);
      expect(tituloBullet.style?.fontWeight, FontWeight.w800);

      final subtituloBullet = tester.widget<Text>(
        find.text(l10n.welcomeBullet1Subtitle),
      );
      expect(subtituloBullet.style?.fontSize, 11.5);
    },
  );

  testWidgets(
    'visual fidelity (audit 14.6): the 3 feature bullets are spaced 12px '
    'apart, not 16 (t4 line 701)',
    (tester) async {
      final navegacion = EstadoNavegacionRaiz();
      addTearDown(navegacion.dispose);

      await tester.pumpWidget(_app(navegacion: navegacion));
      await tester.pumpAndSettle();

      final bullets = find.byType(FilaCaracteristicaBienvenida);
      final gap =
          tester.getTopLeft(bullets.at(1)).dy -
          tester.getBottomLeft(bullets.at(0)).dy;
      expect(gap, 12);
    },
  );

  testWidgets(
    'visual fidelity (audit 14.8): the logo mark is clipped to a 20px '
    'rounded rect, not painted square (t4 line 693)',
    (tester) async {
      final navegacion = EstadoNavegacionRaiz();
      addTearDown(navegacion.dispose);

      await tester.pumpWidget(_app(navegacion: navegacion));
      await tester.pumpAndSettle();

      final clip = tester.widget<ClipRRect>(
        find.ancestor(
          of: find.byKey(const ValueKey('welcome-logo')),
          matching: find.byType(ClipRRect),
        ),
      );
      expect(clip.borderRadius, BorderRadius.circular(20));
    },
  );

  testWidgets('visual fidelity (audit 14.3): the headline is 34px/w800/ls-1.2 '
      '(t4 line 696), not headlineMedium\'s 28', (tester) async {
    final navegacion = EstadoNavegacionRaiz();
    addTearDown(navegacion.dispose);

    await tester.pumpWidget(_app(navegacion: navegacion));
    await tester.pumpAndSettle();

    final headline = tester.widget<Text>(find.text('Tu mundo, en directo'));
    expect(headline.style?.fontSize, 34);
    expect(headline.style?.fontWeight, FontWeight.w800);
    expect(headline.style?.letterSpacing, -1.2);
  });

  testWidgets('visual fidelity (audit 14.7): the CTA is a radius-18 rounded '
      'rectangle (t4 line 715), not the default fully-round StadiumBorder', (
    tester,
  ) async {
    final navegacion = EstadoNavegacionRaiz();
    addTearDown(navegacion.dispose);

    await tester.pumpWidget(_app(navegacion: navegacion));
    await tester.pumpAndSettle();

    final boton = tester.widget<FilledButton>(find.byType(FilledButton));
    final forma = boton.style?.shape?.resolve(<WidgetState>{});
    expect(
      forma,
      isA<RoundedRectangleBorder>().having(
        (s) => (s.borderRadius as BorderRadius).topLeft,
        'topLeft radius',
        const Radius.circular(18),
      ),
    );
  });

  testWidgets('rendered content contains no monetization strings', (
    tester,
  ) async {
    final navegacion = EstadoNavegacionRaiz();
    addTearDown(navegacion.dispose);

    await tester.pumpWidget(_app(navegacion: navegacion));
    await tester.pumpAndSettle();

    final textoCompleto = tester
        .widgetList<Text>(find.byType(Text))
        .map((widget) => widget.data ?? '')
        .join('\n');

    expect(textoCompleto.contains('PRO'), isFalse);
    expect(textoCompleto.contains('€'), isFalse);
    expect(textoCompleto.contains(r'$'), isFalse);
    expect(
      RegExp(r'\d+\s*d[ií]as?\b', caseSensitive: false).hasMatch(textoCompleto),
      isFalse,
      reason: 'no day-count trial phrase (e.g. "14 días")',
    );
    expect(
      find.textContaining('gratuita', findRichText: true),
      findsNothing,
      reason: 'no secondary "free version" link',
    );
    expect(
      find.textContaining('gratis', findRichText: true),
      findsNothing,
      reason: 'no secondary "free version" link',
    );
    // Only one tappable action on the whole screen: the primary CTA.
    expect(find.byType(TextButton), findsNothing);
    expect(find.byType(FilledButton), findsOneWidget);
  });

  testWidgets(
    'tapping the primary CTA switches to Escuchar and pops the welcome route',
    (tester) async {
      // Start on a DIFFERENT tab so a pass actually proves irA() ran,
      // rather than coasting on EstadoNavegacionRaiz's own escuchar default.
      final navegacion = EstadoNavegacionRaiz()..irA(RaizPluriWave.ajustes);
      addTearDown(navegacion.dispose);
      final navigatorKey = GlobalKey<NavigatorState>();

      await tester.pumpWidget(
        ChangeNotifierProvider<EstadoNavegacionRaiz>.value(
          value: navegacion,
          child: MaterialApp(
            navigatorKey: navigatorKey,
            locale: const Locale('es'),
            localizationsDelegates: AppLocalizations.localizationsDelegates,
            supportedLocales: AppLocalizations.supportedLocales,
            home: const Scaffold(body: Center(child: Text('home stand-in'))),
          ),
        ),
      );

      unawaited(
        navigatorKey.currentState!.push(
          MaterialPageRoute<void>(builder: (_) => const PantallaBienvenida()),
        ),
      );
      await tester.pumpAndSettle();
      expect(find.byType(PantallaBienvenida), findsOneWidget);

      await tester.tap(find.text('Empezar a escuchar'));
      await tester.pumpAndSettle();

      expect(navegacion.actual, RaizPluriWave.escuchar);
      expect(
        find.byType(PantallaBienvenida),
        findsNothing,
        reason: 'the welcome route was removed from the back stack',
      );
      expect(find.text('home stand-in'), findsOneWidget);
    },
  );

  testWidgets('visual fidelity (audit 14.1, proto t4 lines 687-689): a blurred '
      'banner backdrop is present behind the content', (tester) async {
    final navegacion = EstadoNavegacionRaiz();
    addTearDown(navegacion.dispose);

    await tester.pumpWidget(_app(navegacion: navegacion));
    await tester.pumpAndSettle();

    expect(
      find.byKey(const ValueKey('welcome-background-art')),
      findsOneWidget,
      reason:
          'the prototype draws a blurred, 40%-opacity banner image '
          'full-bleed behind the content — this screen used to be a '
          'plain Scaffold with no backdrop at all',
    );
  });

  testWidgets(
    'visual fidelity (audit 14.2, proto t4 lines 693/706): the primary CTA '
    'is anchored to the bottom edge, not immediately after the bullets',
    (tester) async {
      final navegacion = EstadoNavegacionRaiz();
      addTearDown(navegacion.dispose);
      tester.view.physicalSize = const Size(1440, 3200);
      tester.view.devicePixelRatio = 1.0;
      addTearDown(tester.view.resetPhysicalSize);
      addTearDown(tester.view.resetDevicePixelRatio);

      await tester.pumpWidget(_app(navegacion: navegacion));
      await tester.pumpAndSettle();

      final alturaPantalla = tester.view.physicalSize.height;
      final ctaAbajo = tester.getBottomLeft(find.byType(FilledButton)).dy;

      expect(
        ctaAbajo,
        greaterThan(alturaPantalla - 100),
        reason:
            'the prototype anchors content to the bottom with two '
            'flexible spacers (lines 693, 706) so the CTA sits at the '
            'screen edge — it used to render immediately after the top '
            'padding instead',
      );
    },
  );
}