pluriwave/lib/pantallas/pantalla_buscar.dart

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';

import '../estado/estado_busqueda.dart';
import '../tema/pluri_animate.dart';
import '../l10n/gen/app_localizations.dart';
import '../widgets/pluri_glass_surface.dart';
import '../widgets/pluri_icon.dart';
import '../widgets/pluri_layout.dart';
import '../widgets/pluri_premium_widgets.dart';
import 'package:pluriwave/widgets/tarjeta_emisora.dart';

import 'reproducir_minimizado.dart';

const _paises = [
  ('countrySpain', 'ES'),
  ('countryUsa', 'US'),
  ('countryMexico', 'MX'),
  ('countryArgentina', 'AR'),
  ('countryUk', 'GB'),
  ('countryFrance', 'FR'),
  ('countryGermany', 'DE'),
  ('countryItaly', 'IT'),
  ('countryBrazil', 'BR'),
  ('countryJapan', 'JP'),
];

const _idiomas = [
  ('spanish', 'languageNameSpanish'),
  ('english', 'languageNameEnglish'),
  ('french', 'languageNameFrench'),
  ('german', 'languageNameGerman'),
  ('portuguese', 'languageNamePortuguese'),
  ('italian', 'languageNameItalian'),
  ('japanese', 'languageNameJapanese'),
  ('arabic', 'languageNameArabic'),
  ('russian', 'languageNameRussian'),
];

class PantallaBuscar extends StatefulWidget {
  const PantallaBuscar({super.key});

  @override
  State<PantallaBuscar> createState() => _PantallaBuscarState();
}

class _PantallaBuscarState extends State<PantallaBuscar> {
  final _controller = TextEditingController();
  String? _paisSeleccionado;
  String? _idiomaSeleccionado;
  int? _calidadMinima;

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  void _buscar() {
    final q = _controller.text.trim();
    context.read<EstadoBusqueda>().buscar(
      nombre: q.isNotEmpty ? q : null,
      pais: _paisSeleccionado,
      idioma: _idiomaSeleccionado,
      minBitrate: _calidadMinima,
    );
  }

  @override
  Widget build(BuildContext context) {
    // S4-R3/S4-R5: this screen depends only on search state, so it watches
    // the dedicated notifier — playback events no longer rebuild it.
    final estado = context.watch<EstadoBusqueda>();
    final theme = Theme.of(context);
    final l10n = AppLocalizations.of(context);

    return ListView(
      padding: PluriLayout.pageListPadding,
      children: [
        PluriScreenHeader(
          title: l10n.searchScreenTitle,
          subtitle: l10n.searchScreenSubtitle,
          glyph: PluriIconGlyph.search,
          trailing: PluriStatusPill(
            icon: Icons.tune_rounded,
            label: l10n.searchFiltersLabel,
          ),
        ),
        Padding(
          padding: const EdgeInsets.fromLTRB(
            PluriLayout.horizontal,
            10,
            PluriLayout.horizontal,
            0,
          ),
          child: PluriGlassSurface(
            padding: const EdgeInsets.all(10),
            borderRadius: BorderRadius.circular(999),
            child: SearchBar(
              controller: _controller,
              hintText: l10n.searchHint,
              leading: const PluriIcon(
                glyph: PluriIconGlyph.search,
                variant: PluriIconVariant.filled,
              ),
              trailing: [
                if (_controller.text.isNotEmpty)
                  IconButton(
                    icon: const Icon(Icons.clear),
                    onPressed: () {
                      _controller.clear();
                      setState(() {});
                      _buscar();
                    },
                  ),
              ],
              onSubmitted: (_) => _buscar(),
              onChanged: (_) => setState(() {}),
            ),
          ),
        ),
        _seccionFiltro(
          l10n.searchCountryFilterLabel,
          _paises.map((p) => (_countryLabel(l10n, p.$1), p.$2)).toList(),
          _paisSeleccionado,
          (v) {
            setState(() => _paisSeleccionado = v);
            _buscar();
          },
        ),
        _seccionFiltro(
          l10n.searchLanguageFilterLabel,
          _idiomas.map((i) => (_languageLabel(l10n, i.$2), i.$1)).toList(),
          _idiomaSeleccionado,
          (v) {
            setState(() => _idiomaSeleccionado = v);
            _buscar();
          },
        ),
        _seccionFiltroInt(
          l10n.searchMinQualityFilterLabel,
          const [
            ('64 kbps', 64),
            ('96 kbps', 96),
            ('128 kbps', 128),
            ('192 kbps', 192),
            ('320 kbps', 320),
          ],
          _calidadMinima,
          (v) {
            setState(() => _calidadMinima = v);
            _buscar();
          },
        ),
        _resultados(estado, theme),
      ],
    );
  }

  Widget _seccionFiltro(
    String titulo,
    List<(String, String)> opciones,
    String? seleccionado,
    void Function(String?) onChanged,
  ) {
    final theme = Theme.of(context);
    return Padding(
      padding: const EdgeInsets.fromLTRB(
        PluriLayout.horizontal,
        8,
        PluriLayout.horizontal,
        0,
      ),
      child: PluriGlassSurface(
        padding: const EdgeInsets.all(10),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text(
              titulo,
              style: theme.textTheme.labelLarge?.copyWith(
                fontWeight: FontWeight.w900,
              ),
            ),
            const SizedBox(height: 6),
            SizedBox(
              height: 40,
              child: ListView.separated(
                scrollDirection: Axis.horizontal,
                itemCount: opciones.length,
                separatorBuilder: (_, __) => const SizedBox(width: 8),
                itemBuilder: (_, i) {
                  final (label, value) = opciones[i];
                  final sel = seleccionado == value;
                  return FilterChip(
                    label: Text(label),
                    selected: sel,
                    visualDensity: VisualDensity.compact,
                    onSelected: (_) => onChanged(sel ? null : value),
                  );
                },
              ),
            ),
          ],
        ),
      ),
    );
  }

  Widget _seccionFiltroInt(
    String titulo,
    List<(String, int)> opciones,
    int? seleccionado,
    void Function(int?) onChanged,
  ) {
    final theme = Theme.of(context);
    return Padding(
      padding: const EdgeInsets.fromLTRB(
        PluriLayout.horizontal,
        8,
        PluriLayout.horizontal,
        0,
      ),
      child: PluriGlassSurface(
        padding: const EdgeInsets.all(10),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text(
              titulo,
              style: theme.textTheme.labelLarge?.copyWith(
                fontWeight: FontWeight.w900,
              ),
            ),
            const SizedBox(height: 6),
            SizedBox(
              height: 40,
              child: ListView.separated(
                scrollDirection: Axis.horizontal,
                itemCount: opciones.length,
                separatorBuilder: (_, __) => const SizedBox(width: 8),
                itemBuilder: (_, i) {
                  final (label, value) = opciones[i];
                  final sel = seleccionado == value;
                  return FilterChip(
                    label: Text(label),
                    selected: sel,
                    visualDensity: VisualDensity.compact,
                    onSelected: (_) => onChanged(sel ? null : value),
                  );
                },
              ),
            ),
          ],
        ),
      ),
    );
  }

  Widget _resultados(EstadoBusqueda estado, ThemeData theme) {
    final l10n = AppLocalizations.of(context);
    if (estado.cargando) {
      // S5-R6: shimmer placeholders instead of a bare spinner, consistent
      // with the loading pattern used by the home grid.
      return Padding(
        padding: const EdgeInsets.all(PluriLayout.horizontal),
        child: Column(
          children: [
            for (var i = 0; i < 4; i++) ...[
              const TarjetaEmisoraShimmer(esCompacta: true),
              if (i < 3) const SizedBox(height: 10),
            ],
          ],
        ),
      );
    }

    final resultados = estado.resultados;

    if (resultados.isEmpty) {
      final sinFiltros =
          _controller.text.isEmpty &&
          _paisSeleccionado == null &&
          _idiomaSeleccionado == null;
      return SizedBox(
        height: 260,
        child: PluriEmptyState(
          glyph: PluriIconGlyph.search,
          title: sinFiltros ? l10n.searchEmptyTitle : l10n.searchNoResultsTitle,
          subtitle:
              sinFiltros
                  ? l10n.searchEmptySubtitle
                  : l10n.searchNoResultsSubtitle,
        ),
      );
    }

    final total = resultados.length + (estado.hayMas ? 1 : 0);
    return ListView.separated(
      shrinkWrap: true,
      physics: const NeverScrollableScrollPhysics(),
      padding: const EdgeInsets.all(PluriLayout.horizontal),
      itemCount: total,
      separatorBuilder: (_, __) => const SizedBox(height: 10),
      itemBuilder: (context, i) {
        if (i >= resultados.length) {
          if (!estado.cargandoMas) {
            Future<void>.microtask(estado.cargarMas);
          }
          return const Padding(
            padding: EdgeInsets.all(18),
            child: Center(child: CircularProgressIndicator()),
          );
        }
        if (i >= resultados.length - 5 && estado.hayMas) {
          Future<void>.microtask(estado.cargarMas);
        }
        return TarjetaEmisora(
          emisora: resultados[i],
          esCompacta: true,
          onTap: () => reproducirMinimizado(context, resultados[i]),
        ).pluriFadeSlideIn(
          context,
          delay: Duration(milliseconds: i.clamp(0, 12) * 20),
          beginY: 0.08,
        );
      },
    );
  }

  String _countryLabel(AppLocalizations l10n, String key) => switch (key) {
    'countrySpain' => l10n.countrySpain,
    'countryUsa' => l10n.countryUsa,
    'countryMexico' => l10n.countryMexico,
    'countryArgentina' => l10n.countryArgentina,
    'countryUk' => l10n.countryUk,
    'countryFrance' => l10n.countryFrance,
    'countryGermany' => l10n.countryGermany,
    'countryItaly' => l10n.countryItaly,
    'countryBrazil' => l10n.countryBrazil,
    'countryJapan' => l10n.countryJapan,
    _ => key,
  };

  String _languageLabel(AppLocalizations l10n, String key) => switch (key) {
    'languageNameSpanish' => l10n.languageNameSpanish,
    'languageNameEnglish' => l10n.languageNameEnglish,
    'languageNameFrench' => l10n.languageNameFrench,
    'languageNameGerman' => l10n.languageNameGerman,
    'languageNamePortuguese' => l10n.languageNamePortuguese,
    'languageNameItalian' => l10n.languageNameItalian,
    'languageNameJapanese' => l10n.languageNameJapanese,
    'languageNameArabic' => l10n.languageNameArabic,
    'languageNameRussian' => l10n.languageNameRussian,
    _ => key,
  };
}