import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:pluriwave/l10n/gen/app_localizations.dart';
import 'package:pluriwave/pantallas/pantalla_tutorial_ayuda.dart';

/// The 9-screen help/tutorial carousel (`PantallaTutorialAyuda`). Content
/// spec: mockup screens 5b..5h (reading order 1..9), each with an icon
/// badge, a headline, a body, a 9-dot progress indicator, a "Siguiente"
/// (Next) button, and -- on every page except the last -- a "Saltar"
/// (Skip) affordance. The last page's CTA reads "Empezar a escuchar" on a
/// first-launch entry, or "Cerrar" when reached manually from Ajustes
/// (`primerArranque` constructor param), and it drops "Saltar" entirely.
Widget _app({required bool primerArranque}) {
  return MaterialApp(
    locale: const Locale('es'),
    localizationsDelegates: AppLocalizations.localizationsDelegates,
    supportedLocales: AppLocalizations.supportedLocales,
    home: PantallaTutorialAyuda(primerArranque: primerArranque),
  );
}

/// The 9 expected headlines, in the mandated reading order (mockup ids
/// 5b, 5c, 5d, 5e, 5f, 5g, 5h1, 5h2, 5h).
List<String> _headlinesEsperados(AppLocalizations l10n) => [
  l10n.tutorialPage1Headline,
  l10n.tutorialPage2Headline,
  l10n.tutorialPage3Headline,
  l10n.tutorialPage4Headline,
  l10n.tutorialPage5Headline,
  l10n.tutorialPage6Headline,
  l10n.tutorialPage7Headline,
  l10n.tutorialPage8Headline,
  l10n.tutorialPage9Headline,
];

void main() {
  final l10n = lookupAppLocalizations(const Locale('es'));

  testWidgets('renders exactly 9 pages, one dot per page', (tester) async {
    await tester.pumpWidget(_app(primerArranque: true));
    await tester.pump();

    final pageView = tester.widget<PageView>(find.byType(PageView));
    expect(pageView.controller!.hasClients, isTrue);

    expect(
      find.byType(PuntoIndicadorTutorial),
      findsNWidgets(9),
      reason: 'exactly 9 dots, one per page',
    );
  });

  testWidgets(
    'the 9 pages carry the right headlines, in the mandated reading order',
    (tester) async {
      await tester.pumpWidget(_app(primerArranque: true));
      await tester.pump();

      final pageView = tester.widget<PageView>(find.byType(PageView));
      final controller = pageView.controller!;
      final esperados = _headlinesEsperados(l10n);

      for (var i = 0; i < esperados.length; i++) {
        controller.jumpToPage(i);
        await tester.pump();
        expect(
          find.text(esperados[i]),
          findsOneWidget,
          reason: 'page $i should show "${esperados[i]}"',
        );
      }
    },
  );

  testWidgets('Saltar pops immediately from the first page', (tester) async {
    final navigatorKey = GlobalKey<NavigatorState>();
    await tester.pumpWidget(
      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 PantallaTutorialAyuda(primerArranque: true),
        ),
      ),
    );
    await tester.pumpAndSettle();
    expect(find.byType(PantallaTutorialAyuda), findsOneWidget);

    await tester.tap(find.text(l10n.tutorialSkipAction));
    await tester.pumpAndSettle();

    expect(find.byType(PantallaTutorialAyuda), findsNothing);
    expect(find.text('home stand-in'), findsOneWidget);
  });

  testWidgets(
    'Saltar pops immediately from a middle page, not only the first',
    (tester) async {
      final navigatorKey = GlobalKey<NavigatorState>();
      await tester.pumpWidget(
        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 PantallaTutorialAyuda(primerArranque: true),
          ),
        ),
      );
      await tester.pumpAndSettle();

      final pageView = tester.widget<PageView>(find.byType(PageView));
      pageView.controller!.jumpToPage(3);
      await tester.pump();

      await tester.tap(find.text(l10n.tutorialSkipAction));
      await tester.pumpAndSettle();

      expect(find.byType(PantallaTutorialAyuda), findsNothing);
      expect(find.text('home stand-in'), findsOneWidget);
    },
  );

  testWidgets('Siguiente advances from the first page to the second', (
    tester,
  ) async {
    await tester.pumpWidget(_app(primerArranque: true));
    await tester.pump();

    expect(find.text(l10n.tutorialPage1Headline), findsOneWidget);

    await tester.tap(find.text(l10n.tutorialNextAction));
    await tester.pumpAndSettle();

    expect(find.text(l10n.tutorialPage2Headline), findsOneWidget);
  });

  testWidgets('Saltar is not offered on the last page', (tester) async {
    await tester.pumpWidget(_app(primerArranque: true));
    await tester.pump();

    final pageView = tester.widget<PageView>(find.byType(PageView));
    pageView.controller!.jumpToPage(8);
    await tester.pump();

    expect(find.text(l10n.tutorialSkipAction), findsNothing);
  });

  testWidgets(
    'last page CTA reads "Empezar a escuchar" when reached via first launch',
    (tester) async {
      await tester.pumpWidget(_app(primerArranque: true));
      await tester.pump();

      final pageView = tester.widget<PageView>(find.byType(PageView));
      pageView.controller!.jumpToPage(8);
      await tester.pump();

      expect(find.text(l10n.welcomeCtaLabel), findsOneWidget);
      expect(find.text(l10n.closeAction), findsNothing);
    },
  );

  testWidgets(
    'last page CTA reads "Cerrar" when reached manually from Ajustes',
    (tester) async {
      await tester.pumpWidget(_app(primerArranque: false));
      await tester.pump();

      final pageView = tester.widget<PageView>(find.byType(PageView));
      pageView.controller!.jumpToPage(8);
      await tester.pump();

      expect(find.text(l10n.closeAction), findsOneWidget);
      expect(find.text(l10n.welcomeCtaLabel), findsNothing);
    },
  );

  testWidgets('tapping the last page CTA pops the route', (tester) async {
    final navigatorKey = GlobalKey<NavigatorState>();
    await tester.pumpWidget(
      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 PantallaTutorialAyuda(primerArranque: false),
        ),
      ),
    );
    await tester.pumpAndSettle();

    final pageView = tester.widget<PageView>(find.byType(PageView));
    pageView.controller!.jumpToPage(8);
    await tester.pump();

    await tester.tap(find.text(l10n.closeAction));
    await tester.pumpAndSettle();

    expect(find.byType(PantallaTutorialAyuda), findsNothing);
    expect(find.text('home stand-in'), findsOneWidget);
  });

  testWidgets('the last page shows the "watch it again" reminder banner', (
    tester,
  ) async {
    await tester.pumpWidget(_app(primerArranque: true));
    await tester.pump();

    final pageView = tester.widget<PageView>(find.byType(PageView));
    pageView.controller!.jumpToPage(8);
    await tester.pump();

    expect(find.text(l10n.tutorialPage9BannerBody), findsOneWidget);
  });
}