import 'dart:io';

import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:pluriwave/estado/estado_radio.dart';
import 'package:pluriwave/l10n/gen/app_localizations.dart';
import 'package:pluriwave/pantallas/ajustes/pantalla_ajustes_grupos_favoritos.dart';
import 'package:pluriwave/pantallas/pantalla_favoritos.dart';
import 'package:pluriwave/servicios/servicio_anuncios.dart';
import 'package:pluriwave/widgets/fila_emisora_plana.dart';
import 'package:pluriwave/widgets/pluri_layout.dart';
import 'package:pluriwave/widgets/pluri_push_scaffold.dart';
import 'package:pluriwave/widgets/pluri_root_header.dart';
import 'package:pluriwave/widgets/tarjeta_emisora.dart';
import 'package:provider/provider.dart';
import 'package:shared_preferences/shared_preferences.dart';

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

/// WU4, `favorites-organization` spec: chip-filtered flat list replacing the
/// stacked per-group panels, drag-to-reorder, the `swap_vert` sort action,
/// group management, and the custom-station CTA — all reachable from
/// Favoritos.
///
/// This screen previously had NO widget-level test coverage —
/// `pantalla_favoritos_plural_test.dart` only exercises `stationCount`'s ARB
/// plural formatting via `AppLocalizations` directly and never imports
/// `PantallaFavoritos`. That file is left untouched (it stays a valid,
/// unrelated regression guard); this new file covers the screen itself.
///
/// 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);
}

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

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

  Future<EstadoRadio> crearEstadoVacio() async {
    return EstadoRadio(
      esPremium: () => true,
      audio: FakeServicioAudio(),
      favoritos: FakeServicioFavoritos(),
      radio: FakeServicioRadio(),
      servicioEcualizador: FakeServicioEcualizador(),
      servicioGrabacion: FakeServicioGrabacionRadioInactiva(),
      resolverArchivoCustom: archivoCustomVacio,
      iniciarAutomaticamente: false,
    );
  }

  /// Seeds 3 favorites (A, B unassigned won't apply — A is unassigned; B and
  /// C are in a "Rock" group) added in A, B, C order (so the natural/manual
  /// order is A, B, C).
  Future<EstadoRadio> crearEstadoConFavoritos() async {
    final estado = await crearEstadoVacio();
    final favoritos = estado.favoritos as FakeServicioFavoritos;
    final rock = await favoritos.crearGrupo('Rock');
    await favoritos.agregar(emisoraDemo(uuid: 'a', nombre: 'Station A'));
    await favoritos.agregar(emisoraDemo(uuid: 'b', nombre: 'Station B'));
    await favoritos.agregar(emisoraDemo(uuid: 'c', nombre: 'Station C'));
    await favoritos.asignarGrupo('b', rock.id);
    await favoritos.asignarGrupo('c', rock.id);
    await estado.cargarFavoritos();
    await estado.cargarGruposFavoritos();
    return estado;
  }

  Widget buildScreen(EstadoRadio estado) {
    // Wrapped in a bare Scaffold, matching pantalla_ajustes_test.dart's
    // convention: in the real app, _PaginaPrincipal's own Scaffold is what
    // gives root screens (which construct zero Scaffold themselves, per
    // ADR-2) a Material ancestor. Without it, Material components like
    // ChoiceChip/PopupMenuButton/ActionChip fail to find one.
    return MultiProvider(
      providers: [
        ChangeNotifierProvider<EstadoRadio>.value(value: estado),
        Provider<ServicioAnuncios>(
          create: (_) => ServicioAnuncios(esPremium: () => true),
        ),
      ],
      child: MaterialApp(
        locale: const Locale('en'),
        localizationsDelegates: AppLocalizations.localizationsDelegates,
        supportedLocales: AppLocalizations.supportedLocales,
        home: const Scaffold(body: PantallaFavoritos()),
      ),
    );
  }

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

  group('visual fidelity (audit 4.5): dashed custom-station CTA', () {
    testWidgets(
      'padding is 14 all around, the icon is a plain add glyph at 20px, '
      'and the label is 13.5px/w800 (t4 line 235)',
      (tester) async {
        final estado = await crearEstadoVacio();
        addTearDown(estado.dispose);
        await tester.pumpWidget(buildScreen(estado));
        await pumpStable(tester);

        final padding = tester.widget<Padding>(
          find.byKey(const Key('custom-station-cta-padding')),
        );
        expect(padding.padding, const EdgeInsets.all(14));

        expect(find.byIcon(Icons.add_circle_outline_rounded), findsNothing);
        final icon = tester.widget<Icon>(find.byIcon(Icons.add_rounded));
        expect(icon.size, 20);

        final l10n = lookupAppLocalizations(const Locale('en'));
        final texto = tester.widget<Text>(find.text(l10n.customStationsAddCta));
        expect(texto.style?.fontSize, 13.5);
        expect(texto.style?.fontWeight, FontWeight.w800);
      },
    );
  });

  // ── EstadoRadio: new state surface (state-layer, not widget-layer) ───────

  test('listaFavoritosManual returns favorites in stored order, NOT re-sorted '
      'by the global ordenListas setting (unlike listaFavoritos)', () async {
    final estado = await crearEstadoConFavoritos();
    addTearDown(estado.dispose);

    // Natural insertion order is A, B, C; ordenListas defaults to calidad,
    // which would NOT necessarily preserve that order if applied.
    expect(estado.listaFavoritosManual.map((e) => e.uuid).toList(), [
      'a',
      'b',
      'c',
    ]);
  });

  test('reordenarFavorito persists the new manual order', () async {
    final estado = await crearEstadoConFavoritos();
    addTearDown(estado.dispose);

    await estado.reordenarFavorito('c', 0);

    expect(estado.listaFavoritosManual.map((e) => e.uuid).toList(), [
      'c',
      'a',
      'b',
    ]);
    // Persists across a simulated restart: reload from the (fake) service.
    await estado.cargarFavoritos();
    expect(estado.listaFavoritosManual.map((e) => e.uuid).toList(), [
      'c',
      'a',
      'b',
    ]);
  });

  test('ordenarFavoritos applies an existing OrdenEmisoras criterion and '
      'persists the result as the new manual order', () async {
    final estado = await crearEstadoConFavoritos();
    addTearDown(estado.dispose);
    // Put them out of alphabetical order first.
    await estado.reordenarFavorito('c', 0);
    expect(estado.listaFavoritosManual.map((e) => e.uuid).toList(), [
      'c',
      'a',
      'b',
    ]);

    await estado.ordenarFavoritos(OrdenEmisoras.nombre);

    expect(estado.listaFavoritosManual.map((e) => e.nombre).toList(), [
      'Station A',
      'Station B',
      'Station C',
    ]);
    // Persists: a simulated restart still shows the sorted order, not the
    // pre-sort manual order.
    await estado.cargarFavoritos();
    expect(estado.listaFavoritosManual.map((e) => e.nombre).toList(), [
      'Station A',
      'Station B',
      'Station C',
    ]);
  });

  // ── Widget-level: PantallaFavoritos ───────────────────────────────────────

  testWidgets(
    'shows the empty state with the custom-station CTA when there are no '
    'favorites',
    (tester) async {
      final estado = await crearEstadoVacio();
      addTearDown(estado.dispose);
      await estado.cargarFavoritos();
      await estado.cargarGruposFavoritos();

      await tester.pumpWidget(buildScreen(estado));
      await pumpStable(tester);

      expect(find.text('No favorites yet'), findsOneWidget);
      expect(find.text('Add custom station'), findsOneWidget);
    },
  );

  testWidgets(
    'chip filter narrows the list to the selected group ("All · N" plus '
    'one chip per group)',
    (tester) async {
      setLargeSurface(tester);
      _suppressListTileInkAssertion();
      final estado = await crearEstadoConFavoritos();
      addTearDown(estado.dispose);

      await tester.pumpWidget(buildScreen(estado));
      await pumpStable(tester);

      expect(find.text('All · 3'), findsOneWidget);
      expect(find.text('Unassigned · 1'), findsOneWidget);
      expect(find.text('Rock · 2'), findsOneWidget);
      expect(find.text('Station A'), findsOneWidget);
      expect(find.text('Station B'), findsOneWidget);
      expect(find.text('Station C'), findsOneWidget);

      await tester.tap(find.text('Rock · 2'));
      await pumpStable(tester);

      expect(find.text('Station A'), findsNothing);
      expect(find.text('Station B'), findsOneWidget);
      expect(find.text('Station C'), findsOneWidget);
    },
  );

  testWidgets('dragging the 3rd item to the 1st position persists across a '
      'simulated restart', (tester) async {
    setLargeSurface(tester);
    _suppressListTileInkAssertion();
    final estado = await crearEstadoConFavoritos();
    addTearDown(estado.dispose);

    await tester.pumpWidget(buildScreen(estado));
    await pumpStable(tester);

    final lista = tester.widget<ReorderableListView>(
      find.byType(ReorderableListView),
    );
    // Drag the 3rd row (index 2, "Station C") to the 1st position (index
    // 0), exercised via the real onReorder callback the widget wires up.
    // `onReorder` is the API present across Flutter versions (the newer
    // `onReorderItem` does not exist on the CI SDK), so it reports
    // newIndex in the PRE-removal coordinate space; `_onReorder`
    // compensates internally. Moving upwards needs no shift, which is why
    // (2, 0) maps straight through.
    lista.onReorder!(2, 0);
    await pumpStable(tester);

    expect(estado.listaFavoritosManual.map((e) => e.uuid).toList(), [
      'c',
      'a',
      'b',
    ]);

    // Persists across a simulated restart.
    await estado.cargarFavoritos();
    expect(estado.listaFavoritosManual.map((e) => e.uuid).toList(), [
      'c',
      'a',
      'b',
    ]);
  });

  testWidgets('dragging the 1st item downwards lands it in the right slot', (
    tester,
  ) async {
    // Guards the pre-removal index compensation in `_onReorder`. Downward
    // drags are the ONLY direction `ReorderableListView.onReorder` reports
    // in the pre-removal coordinate space, so an off-by-one here would slip
    // past the upward-drag test above entirely.
    setLargeSurface(tester);
    _suppressListTileInkAssertion();
    final estado = await crearEstadoConFavoritos();
    addTearDown(estado.dispose);

    await tester.pumpWidget(buildScreen(estado));
    await pumpStable(tester);

    final lista = tester.widget<ReorderableListView>(
      find.byType(ReorderableListView),
    );
    // Move "Station A" (index 0) into the MIDDLE slot. onReorder reports
    // newIndex == 2 in the pre-removal space; `_onReorder` shifts it to 1.
    // This specific case is what makes the test meaningful: dropping at the
    // very end (0, 3) yields the same answer with or without the shift,
    // because both land in the `newIndex >= restantes.length` branch. Only a
    // mid-list drop separates the two.
    lista.onReorder!(0, 2);
    await pumpStable(tester);

    expect(estado.listaFavoritosManual.map((e) => e.uuid).toList(), [
      'b',
      'a',
      'c',
    ]);
  });

  testWidgets(
    'swap_vert sort action applies OrdenEmisoras.nombre and re-renders '
    'alphabetically',
    (tester) async {
      setLargeSurface(tester);
      _suppressListTileInkAssertion();
      final estado = await crearEstadoConFavoritos();
      addTearDown(estado.dispose);
      await estado.reordenarFavorito('c', 0); // out of alphabetical order

      await tester.pumpWidget(buildScreen(estado));
      await pumpStable(tester);

      await tester.tap(find.byIcon(Icons.swap_vert_rounded));
      await tester.pumpAndSettle();
      await tester.tap(find.text('By name'));
      await pumpStable(tester);

      expect(estado.listaFavoritosManual.map((e) => e.nombre).toList(), [
        'Station A',
        'Station B',
        'Station C',
      ]);
      // The list re-renders in the new order too, not just the state.
      expect(
        tester.getCenter(find.text('Station A')).dy <
            tester.getCenter(find.text('Station B')).dy,
        isTrue,
      );
    },
  );

  testWidgets(
    'the create-group action opens group management, and a newly created '
    'group appears as a new filter chip',
    (tester) async {
      setLargeSurface(tester);
      _suppressListTileInkAssertion();
      final estado = await crearEstadoConFavoritos();
      addTearDown(estado.dispose);

      await tester.pumpWidget(buildScreen(estado));
      await pumpStable(tester);

      // Audit 4.1 (t4:216): the manage-groups action moved into the
      // header as a create_new_folder icon button, replacing the old
      // "Manage lists" ActionChip in the chip strip.
      await tester.tap(
        find.byKey(const ValueKey('favorites-manage-groups-action')),
      );
      await pumpStable(tester);

      // "Group Management Reachable from Favoritos": the SAME screen
      // Settings uses, reused rather than duplicated.
      expect(find.byType(PluriPushScaffold), findsOneWidget);
      expect(find.byType(PantallaAjustesGruposFavoritos), findsOneWidget);

      // Deliberately does NOT interact with _editarGrupo's create-group
      // bottom sheet here: it has a pre-existing, out-of-scope
      // TextEditingController dispose-race (Engram
      // sdd/rediseno-funcional/controller-dispose-bugfix, tracked
      // separately, not to be fixed in this WU) already independently
      // exercised by pantalla_ajustes_grupos_favoritos_test.dart. Popping
      // back to Favoritos and calling the same EstadoRadio method that
      // form calls proves the part that's actually NEW here — the chip
      // row's reactivity to a newly created group — without depending on
      // that unrelated bug's timing.
      //
      // PluriPushScaffold uses a plain IconButton for its back affordance,
      // not a semantic BackButtonIcon/CupertinoNavigationBarBackButton —
      // tester.pageBack() looks for those and finds neither.
      await tester.tap(find.byIcon(Icons.arrow_back_rounded));
      // pumpAndSettle, not pumpStable: the pop transition's default
      // animation needs more than a bounded 100ms pump to fully finish.
      await tester.pumpAndSettle();

      expect(find.byType(PantallaAjustesGruposFavoritos), findsNothing);
      expect(
        find.byKey(const ValueKey('favorites-manage-groups-action')),
        findsOneWidget,
      );

      await estado.crearGrupoFavoritos('Road trip');
      await pumpStable(tester);

      expect(find.text('Road trip · 0'), findsOneWidget);
    },
  );

  testWidgets('custom-station CTA opens the add-station flow', (tester) async {
    setLargeSurface(tester);
    _suppressListTileInkAssertion();
    final estado = await crearEstadoConFavoritos();
    addTearDown(estado.dispose);

    await tester.pumpWidget(buildScreen(estado));
    await pumpStable(tester);

    // The 3200px test surface already fits header + chips + 3 rows +
    // footer, so no scroll is needed to reach the CTA.
    await tester.tap(find.text('Add custom station'));
    await tester.pumpAndSettle();

    expect(find.widgetWithText(TextFormField, 'Name *'), findsOneWidget);
  });

  // Item 23 / audit 4.3 (t4:226-232): flat, background-less rows with a
  // square thumbnail and a circular play affordance, replacing the full
  // glass TarjetaEmisora card + two stacked filledTonal buttons.
  group('Item 23 -- flat rows (audit 4.3)', () {
    testWidgets(
      'each row is a flat FilaEmisoraPlana, not the full glass card',
      (tester) async {
        setLargeSurface(tester);
        _suppressListTileInkAssertion();
        final estado = await crearEstadoConFavoritos();
        addTearDown(estado.dispose);

        await tester.pumpWidget(buildScreen(estado));
        await pumpStable(tester);

        expect(find.byType(FilaEmisoraPlana), findsNWidgets(3));
        expect(
          find.byType(TarjetaEmisora),
          findsNothing,
          reason: 'audit 4.3 replaces the full glass card with a flat row',
        );
        expect(
          find.byIcon(Icons.drag_indicator_rounded),
          findsNWidgets(3),
          reason: 't4:227 drag_indicator, not drag_handle',
        );
        expect(find.byIcon(Icons.drag_handle_rounded), findsNothing);
        expect(
          find.byType(BotonReproducirCircular),
          findsNWidgets(3),
          reason: 't4:230 a circular play affordance per row',
        );
      },
    );

    testWidgets(
      'the overflow menu offers exactly "Move to list" and "Remove from '
      'favorites"',
      (tester) async {
        setLargeSurface(tester);
        _suppressListTileInkAssertion();
        final estado = await crearEstadoConFavoritos();
        addTearDown(estado.dispose);

        await tester.pumpWidget(buildScreen(estado));
        await pumpStable(tester);

        await tester.tap(find.byIcon(Icons.more_vert_rounded).first);
        await tester.pumpAndSettle();

        expect(find.text('Move to list'), findsOneWidget);
        expect(find.text('Remove from favorites'), findsOneWidget);
        expect(find.byType(PopupMenuItem<String>), findsNWidgets(2));

        // Regression guard for a real user-reported bug: the button carried
        // `constraints: BoxConstraints.tightFor(width: 38, height: 42)`,
        // which sizes the POPUP MENU rather than the button. Every item was
        // clipped to its first letter — users saw "M" and "E", not the
        // labels. The three assertions above all PASSED throughout, because
        // find.text matches a Text widget in the tree whether or not it is
        // visually clipped. Only measuring the laid-out width catches it.
        final anchoItem = tester.getSize(
          find.byType(PopupMenuItem<String>).first,
        );
        expect(
          anchoItem.width,
          greaterThan(100),
          reason:
              'a menu item narrower than its label means the popup is being '
              'constrained and the text is clipped',
        );
      },
    );

    testWidgets(
      '"Remove from favorites" still calls the same removal path as before',
      (tester) async {
        setLargeSurface(tester);
        _suppressListTileInkAssertion();
        final estado = await crearEstadoConFavoritos();
        addTearDown(estado.dispose);

        await tester.pumpWidget(buildScreen(estado));
        await pumpStable(tester);

        // Invoke the callback directly rather than opening the overlay and
        // tapping its rendered item by screen position: leaving that modal
        // route open while the tap it triggers removes and unmounts the
        // very row that anchors it is a real hang hazard, confirmed while
        // developing this test (multi-minute stall, same class of risk as
        // the project's other documented `pumpAndSettle` traps).
        final boton = tester.widget<PopupMenuButton<String>>(
          find.byType(PopupMenuButton<String>).first,
        );
        boton.onSelected!('remove');
        await pumpStable(tester);

        expect(find.text('Station A'), findsNothing);
      },
    );
  });

  group('visual fidelity (audit 4.2)', () {
    testWidgets('the active group chip is solid brand teal with dark text; '
        'inactive chips use listSurface (t4:219-221)', (tester) async {
      setLargeSurface(tester);
      _suppressListTileInkAssertion();
      final estado = await crearEstadoConFavoritos();
      addTearDown(estado.dispose);

      await tester.pumpWidget(buildScreen(estado));
      await pumpStable(tester);

      final activo = tester.widget<ChoiceChip>(
        find.widgetWithText(ChoiceChip, 'All · 3'),
      );
      expect(activo.selected, isTrue);
      expect(activo.selectedColor, const Color(0xFF21D4D9));
      expect(activo.labelStyle?.color, const Color(0xFF062126));

      final inactivo = tester.widget<ChoiceChip>(
        find.widgetWithText(ChoiceChip, 'Rock · 2'),
      );
      expect(inactivo.selected, isFalse);
      expect(inactivo.backgroundColor, const Color(0xFF102532));
    });
  });

  group('Issue 3 (feedback-pruebas): spacing tiers', () {
    testWidgets('the header title sits at title-tier inset (20px) -- '
        'ReorderableListView.padding used to double up on top of '
        "PluriRootHeader's own internal inset", (tester) async {
      setLargeSurface(tester);
      _suppressListTileInkAssertion();
      final estado = await crearEstadoConFavoritos();
      addTearDown(estado.dispose);
      final l10n = lookupAppLocalizations(const Locale('en'));

      await tester.pumpWidget(buildScreen(estado));
      await pumpStable(tester);

      final titulo = find.descendant(
        of: find.byType(PluriRootHeader),
        matching: find.text(l10n.favoritesTitle),
      );
      expect(
        tester.getTopLeft(titulo).dx,
        PluriLayout.titleHorizontal,
        reason:
            'PluriRootHeader already supplies its own 20px inset; the '
            'previous ReorderableListView.padding of 16 doubled up on top '
            'of it, landing the title at 36px instead of 20px -- the ONE '
            "root screen whose header didn't match Alarmas/Ajustes",
      );
    });

    testWidgets(
      'the header sits at the SAME horizontal position whether the list is '
      'empty or populated -- two mutually-exclusive states of the same '
      'header must not read differently',
      (tester) async {
        setLargeSurface(tester);
        final l10n = lookupAppLocalizations(const Locale('en'));

        final vacio = await crearEstadoVacio();
        addTearDown(vacio.dispose);
        await tester.pumpWidget(buildScreen(vacio));
        await pumpStable(tester);
        final dxVacio =
            tester
                .getTopLeft(
                  find.descendant(
                    of: find.byType(PluriRootHeader),
                    matching: find.text(l10n.favoritesTitle),
                  ),
                )
                .dx;

        _suppressListTileInkAssertion();
        final conFavoritos = await crearEstadoConFavoritos();
        addTearDown(conFavoritos.dispose);
        await tester.pumpWidget(buildScreen(conFavoritos));
        await pumpStable(tester);
        final dxConFavoritos =
            tester
                .getTopLeft(
                  find.descendant(
                    of: find.byType(PluriRootHeader),
                    matching: find.text(l10n.favoritesTitle),
                  ),
                )
                .dx;

        expect(
          dxConFavoritos,
          dxVacio,
          reason:
              'the empty and populated branches of this screen must render '
              'the SAME header inset -- they previously did not (0 vs 16 '
              'extra px of list-level padding)',
        );
      },
    );

    testWidgets(
      'each favourite row uses row-tier horizontal inset (12), not the '
      'card-tier constant a background-less row was never meant to carry',
      (tester) async {
        setLargeSurface(tester);
        _suppressListTileInkAssertion();
        final estado = await crearEstadoConFavoritos();
        addTearDown(estado.dispose);

        await tester.pumpWidget(buildScreen(estado));
        await pumpStable(tester);

        expect(
          tester.getTopLeft(find.byType(FilaEmisoraPlana).first).dx,
          PluriLayout.rowHorizontal,
          reason:
              'audit 4.3: background-less rows are row tier (12), matching '
              'the same widget already fixed on Buscar -- not card tier '
              '(16)',
        );
      },
    );
  });
}

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