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_bienvenida.dart';
import 'package:shared_preferences/shared_preferences.dart';

/// WU17b: `PantallaBienvenida.mostrarSiProcede` wires the welcome screen
/// into the genuine first-launch flow. WU17 built and tested the screen
/// fully in isolation, but nothing in `lib/app.dart` or `lib/main.dart`
/// ever referenced it — it was unreachable. These tests pin the actual
/// gap: the screen must show on a genuine first launch and never again
/// once `ServicioBienvenida` has recorded it as seen.
Widget _appConDisparador(GlobalKey<NavigatorState> navigatorKey) {
  return MaterialApp(
    navigatorKey: navigatorKey,
    locale: const Locale('es'),
    localizationsDelegates: AppLocalizations.localizationsDelegates,
    supportedLocales: AppLocalizations.supportedLocales,
    home: Builder(
      builder:
          (context) => Scaffold(
            body: Center(
              child: ElevatedButton(
                onPressed: () => PantallaBienvenida.mostrarSiProcede(context),
                child: const Text('disparar'),
              ),
            ),
          ),
    ),
  );
}

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();

  testWidgets(
    'first launch (no seen flag persisted) shows the welcome screen',
    (tester) async {
      SharedPreferences.setMockInitialValues({});
      final navigatorKey = GlobalKey<NavigatorState>();

      await tester.pumpWidget(_appConDisparador(navigatorKey));
      await tester.tap(find.text('disparar'));
      await tester.pumpAndSettle();

      expect(find.byType(PantallaBienvenida), findsOneWidget);
    },
  );

  testWidgets(
    'second launch (seen flag already persisted) does not show it again',
    (tester) async {
      SharedPreferences.setMockInitialValues({
        'pluri_bienvenida_vista_v1': true,
      });
      final navigatorKey = GlobalKey<NavigatorState>();

      await tester.pumpWidget(_appConDisparador(navigatorKey));
      await tester.tap(find.text('disparar'));
      await tester.pumpAndSettle();

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

  testWidgets('showing it once persists the flag so a later check in the same '
      'session skips it', (tester) async {
    SharedPreferences.setMockInitialValues({});
    final navigatorKey = GlobalKey<NavigatorState>();

    await tester.pumpWidget(_appConDisparador(navigatorKey));
    await tester.tap(find.text('disparar'));
    await tester.pumpAndSettle();
    expect(find.byType(PantallaBienvenida), findsOneWidget);

    // Dismiss it the same way the CTA does (a plain pop), simulating the
    // welcome screen being resolved before the next check ever happens.
    navigatorKey.currentState!.pop();
    await tester.pumpAndSettle();

    await tester.tap(find.text('disparar'));
    await tester.pumpAndSettle();
    expect(find.byType(PantallaBienvenida), findsNothing);
  });
}