import 'package:cached_network_image/cached_network_image.dart';
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:shimmer/shimmer.dart' as shimmer;

import '../estado/estado_ecualizador.dart';
import '../estado/estado_navegacion.dart';
import '../estado/estado_radio.dart';
import '../l10n/display_names.dart';
import '../l10n/gen/app_localizations.dart';
import '../modelos/emisora.dart';
import '../servicios/servicio_audio.dart';
import '../tema/pluriwave_theme.dart';
import '../widgets/pluri_glass_surface.dart';
import '../widgets/pluri_layout.dart';
import '../widgets/pluri_premium_widgets.dart';
import '../widgets/visualizador_audio.dart';
import 'package:pluriwave/widgets/tarjeta_emisora.dart';

import 'pantalla_reproductor.dart';
import 'reproducir_minimizado.dart';

/// Pantalla principal: emisoras populares y por género.
class PantallaInicio extends StatefulWidget {
  const PantallaInicio({super.key});

  @override
  State<PantallaInicio> createState() => _PantallaInicioState();
}

class _PantallaInicioState extends State<PantallaInicio> {
  @override
  Widget build(BuildContext context) {
    // S4-R5: no root watch on EstadoRadio. Every field is consumed through
    // context.select over identity-memoized getters, so audio buffer events
    // (which notify EstadoRadio) no longer rebuild this screen.
    final theme = Theme.of(context);
    final l10n = AppLocalizations.of(context);

    return CustomScrollView(
      slivers: [
        // WU5 built the hero; WU6 relocated the discovery sections that
        // used to follow it (_seccionCercanas, _seccionTendencias,
        // _chipGeneros, _errorBanner, the browse grid) into
        // PantallaBuscar's landing state and DELETED them here (this WU's
        // own task 6.5 — completing WU5's task 5.9 deferral). Escuchar's
        // content is now just the hero and the favorites preview below;
        // pull-to-refresh was dropped along with the grid it refreshed —
        // the retry button that used to live in the (now relocated) error
        // banner already covers manual recovery on Buscar.
        const SliverToBoxAdapter(child: _EscucharHero()),
        SliverToBoxAdapter(child: _seccionTusEmisoras(context, theme, l10n)),
        // ADR-7(b): the mini player is hidden on this whole screen
        // (app.dart), so its content needs less bottom padding than every
        // other root — escucharBottomChromeInset, not the plain
        // bottomChromeInset every other root/scrollable uses.
        const SliverToBoxAdapter(
          child: SizedBox(height: PluriLayout.escucharBottomChromeInset),
        ),
      ],
    );
  }

  /// WU5 task 5.8: a preview of `listaFavoritos` (capped — full browsing,
  /// filtering, and reordering live on Favoritos itself, WU4), with "Ver
  /// todas" switching the root tab via `EstadoNavegacionRaiz.irA` rather
  /// than pushing a route (`app-navigation-shell` — Root-to-Root Switching
  /// Without Push).
  static const _capTusEmisoras = 6;

  Widget _seccionTusEmisoras(
    BuildContext context,
    ThemeData theme,
    AppLocalizations l10n,
  ) {
    final favoritos = context.select<EstadoRadio, List<Emisora>>(
      (e) => e.listaFavoritos,
    );
    final mostrados = favoritos.take(_capTusEmisoras).toList();

    return Padding(
      padding: const EdgeInsets.fromLTRB(
        PluriLayout.horizontal,
        8,
        PluriLayout.horizontal,
        0,
      ),
      child: PluriGlassSurface(
        padding: const EdgeInsets.all(12),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Row(
              children: [
                Expanded(
                  child: Text(
                    l10n.yourStationsTitle,
                    style: theme.textTheme.titleMedium?.copyWith(
                      fontWeight: FontWeight.w900,
                    ),
                  ),
                ),
                TextButton(
                  onPressed:
                      () => context.read<EstadoNavegacionRaiz>().irA(
                        RaizPluriWave.favoritos,
                      ),
                  child: Text(l10n.seeAllAction),
                ),
              ],
            ),
            if (mostrados.isEmpty)
              Padding(
                padding: const EdgeInsets.only(bottom: 4),
                child: Text(
                  l10n.favoritesEmptySubtitle,
                  style: theme.textTheme.bodySmall,
                ),
              )
            else
              SizedBox(
                height: 76,
                child: ListView.separated(
                  scrollDirection: Axis.horizontal,
                  itemCount: mostrados.length,
                  separatorBuilder: (_, __) => const SizedBox(width: 8),
                  itemBuilder: (context, i) {
                    final emisora = mostrados[i];
                    return SizedBox(
                      width: 260,
                      child: TarjetaEmisora(
                        emisora: emisora,
                        esCompacta: true,
                        onTap: () => reproducirMinimizado(context, emisora),
                      ),
                    );
                  },
                ),
              ),
          ],
        ),
      ),
    );
  }

}

/// WU5, design ADR-7: the Escuchar embedded player. `EstadoRadio` is the
/// single source of truth (`emisoraActual` already feeds `MiniReproductor`
/// and `PantallaReproductor`) — this hero is a third VIEW, never a third
/// STATE.
///
/// Binding rules this class exists to enforce:
/// 1. StatelessWidget — no cached `Emisora`, no local playback flag.
/// 2. Reads use `context.select` per scalar (here, `emisoraActual` itself —
///    `Emisora`'s own `==`/`hashCode` are uuid-based, so this only rebuilds
///    the hero when the STATION actually changes, not on every audio buffer
///    event `EstadoRadio` also notifies on). Fast-changing playback status
///    (`EstadoReproduccion`) is read via `StreamBuilder` instead, the same
///    pattern `_Controles`/`MiniReproductor` already use, so status ticks
///    don't even reach this widget's own rebuild path.
/// 3. Transport calls the SAME `EstadoRadio`/`EstadoEcualizador` methods the
///    full player calls — no new playback methods.
/// 4. `VisualizadorAudio` is reused UNCHANGED, just re-parameterised
///    (`barras: 30`, `altura: 26`, `color: liveGreen`).
class _EscucharHero extends StatelessWidget {
  const _EscucharHero();

  @override
  Widget build(BuildContext context) {
    final l10n = AppLocalizations.of(context);
    final theme = Theme.of(context);
    final emisora = context.select<EstadoRadio, Emisora?>(
      (e) => e.emisoraActual,
    );

    if (emisora == null) {
      return Padding(
        padding: const EdgeInsets.fromLTRB(
          PluriLayout.horizontal,
          8,
          PluriLayout.horizontal,
          0,
        ),
        child: PluriGlassSurface(
          padding: const EdgeInsets.all(20),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Text(
                l10n.nothingPlayingTitle,
                style: theme.textTheme.titleMedium?.copyWith(
                  fontWeight: FontWeight.w900,
                ),
              ),
              const SizedBox(height: 4),
              Text(
                l10n.nothingPlayingSubtitle,
                style: theme.textTheme.bodySmall,
              ),
            ],
          ),
        ),
      );
    }

    final estado = context.read<EstadoRadio>();
    final stationName = localizedStationName(l10n, emisora.nombre);

    return Padding(
      padding: const EdgeInsets.fromLTRB(
        PluriLayout.horizontal,
        8,
        PluriLayout.horizontal,
        0,
      ),
      child: PluriGlassSurface(
        padding: const EdgeInsets.all(16),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            Row(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                _ArteEscuchar(emisora: emisora),
                const SizedBox(width: 12),
                Expanded(
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      StreamBuilder<EstadoReproduccion>(
                        stream: estado.estadoStream,
                        builder: (context, snap) {
                          final s = snap.data ?? EstadoReproduccion.detenido;
                          final enVivo = s == EstadoReproduccion.reproduciendo;
                          return PluriStatusPill(
                            icon:
                                enVivo
                                    ? Icons.podcasts_rounded
                                    : Icons.pause_circle_outline_rounded,
                            label: enVivo ? l10n.liveNow : l10n.notPlaying,
                            accent:
                                enVivo ? context.pluriTokens.liveGreen : null,
                          );
                        },
                      ),
                      const SizedBox(height: 6),
                      Text(
                        stationName,
                        style: theme.textTheme.titleLarge?.copyWith(
                          fontWeight: FontWeight.w800,
                        ),
                        maxLines: 2,
                        overflow: TextOverflow.ellipsis,
                      ),
                      const SizedBox(height: 8),
                      VisualizadorAudio(
                        estadoStream: estado.estadoStream,
                        androidAudioSessionIdStream:
                            estado.audio.androidAudioSessionIdStream,
                        barras: 30,
                        altura: 26,
                        color: context.pluriTokens.liveGreen,
                      ),
                    ],
                  ),
                ),
              ],
            ),
            const SizedBox(height: 14),
            _FilaTransporteEscuchar(emisora: emisora),
            const SizedBox(height: 10),
            Align(
              alignment: Alignment.centerLeft,
              child: OutlinedButton.icon(
                icon: const Icon(Icons.tune_rounded, size: 18),
                label: Text(l10n.openFullPlayerTooltip),
                onPressed: () => PantallaReproductor.abrir(context, emisora),
              ),
            ),
          ],
        ),
      ),
    );
  }
}

/// Square art (the design's requested shape for the Escuchar hero — the
/// full player's own `_WaveHero`, `pantalla_reproductor.dart`, stays
/// circular and unchanged).
class _ArteEscuchar extends StatelessWidget {
  const _ArteEscuchar({required this.emisora});

  final Emisora emisora;

  static const _lado = 84.0;

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final radius = BorderRadius.circular(context.pluriTokens.radiusMd);
    return PluriGlassSurface(
      padding: EdgeInsets.zero,
      borderRadius: radius,
      child: SizedBox(
        width: _lado,
        height: _lado,
        child: ClipRRect(
          borderRadius: radius,
          child:
              (emisora.favicon != null && emisora.favicon!.isNotEmpty)
                  ? CachedNetworkImage(
                    imageUrl: emisora.favicon!,
                    fit: BoxFit.cover,
                    placeholder: (_, __) => _shimmerCuadrado(theme),
                    errorWidget: (_, __, ___) => _iconoFallback(theme),
                  )
                  : _iconoFallback(theme),
        ),
      ),
    );
  }

  Widget _shimmerCuadrado(ThemeData theme) => shimmer.Shimmer.fromColors(
    baseColor: theme.colorScheme.surfaceContainerHighest,
    highlightColor: theme.colorScheme.surface,
    child: Container(color: theme.colorScheme.surfaceContainerHighest),
  );

  Widget _iconoFallback(ThemeData theme) => Container(
    color: theme.colorScheme.primaryContainer,
    child: Icon(
      Icons.radio_rounded,
      size: 36,
      color: theme.colorScheme.onPrimaryContainer,
    ),
  );
}

/// The hero's transport row — favorite / EQ toggle / stop / play-pause
/// (primary) / sleep, in that order, with sleep as the documented 5th
/// action. Every action calls an EXISTING `EstadoRadio`/`EstadoEcualizador`
/// method — no new playback surface (ADR-7 rule 3).
class _FilaTransporteEscuchar extends StatelessWidget {
  const _FilaTransporteEscuchar({required this.emisora});

  final Emisora emisora;

  @override
  Widget build(BuildContext context) {
    final l10n = AppLocalizations.of(context);
    final t = context.pluriTokens;
    final estado = context.read<EstadoRadio>();
    final esFavorito = context.select<EstadoRadio, bool>(
      (e) => e.listaFavoritos.any((x) => x.uuid == emisora.uuid),
    );
    final eqActivo = context.select<EstadoEcualizador, bool>((e) => e.activo);
    final timerActivo = context.select<EstadoRadio, bool>(
      (e) => e.timer.activo,
    );

    return Row(
      mainAxisAlignment: MainAxisAlignment.spaceBetween,
      children: [
        IconButton(
          tooltip:
              esFavorito
                  ? l10n.favoritesRemoveTooltip
                  : l10n.favoritesAddTooltip,
          icon: Icon(
            esFavorito
                ? Icons.favorite_rounded
                : Icons.favorite_outline_rounded,
            color: esFavorito ? Theme.of(context).colorScheme.error : null,
          ),
          onPressed: () => estado.toggleFavorito(emisora),
        ),
        IconButton(
          tooltip: eqActivo ? l10n.equalizerDisable : l10n.equalizerEnable,
          icon: Icon(
            eqActivo ? Icons.equalizer_rounded : Icons.equalizer_outlined,
            color: eqActivo ? t.warmCoral : null,
          ),
          onPressed:
              () => context.read<EstadoEcualizador>().cambiarActivo(!eqActivo),
        ),
        StreamBuilder<EstadoReproduccion>(
          stream: estado.estadoStream,
          builder: (context, snap) {
            final s = snap.data ?? EstadoReproduccion.detenido;
            final cargando =
                s == EstadoReproduccion.cargando ||
                s == EstadoReproduccion.reconectando;
            return IconButton(
              tooltip: l10n.stopAction,
              icon: const Icon(Icons.stop_circle_outlined),
              onPressed: cargando ? null : estado.detenerReproduccion,
            );
          },
        ),
        StreamBuilder<EstadoReproduccion>(
          stream: estado.estadoStream,
          builder: (context, snap) {
            final s = snap.data ?? EstadoReproduccion.detenido;
            final reproduciendo = s == EstadoReproduccion.reproduciendo;
            final cargando =
                s == EstadoReproduccion.cargando ||
                s == EstadoReproduccion.reconectando;
            return SizedBox(
              width: 56,
              height: 56,
              child: FilledButton(
                style: FilledButton.styleFrom(
                  shape: const CircleBorder(),
                  padding: EdgeInsets.zero,
                ),
                onPressed:
                    cargando
                        ? null
                        : () {
                          if (reproduciendo ||
                              s == EstadoReproduccion.pausado) {
                            estado.togglePlay();
                          } else {
                            estado.reproducir(emisora);
                          }
                        },
                child:
                    cargando
                        ? const SizedBox(
                          width: 22,
                          height: 22,
                          child: CircularProgressIndicator(strokeWidth: 2),
                        )
                        : Icon(
                          reproduciendo
                              ? Icons.pause_rounded
                              : Icons.play_arrow_rounded,
                          size: 28,
                        ),
              ),
            );
          },
        ),
        IconButton(
          tooltip: l10n.sleepTimer,
          icon: Icon(
            Icons.bedtime_rounded,
            color: timerActivo ? t.warmCoral : null,
          ),
          onPressed: () => _mostrarTimerSheet(context, estado, l10n),
        ),
      ],
    );
  }

  Future<void> _mostrarTimerSheet(
    BuildContext context,
    EstadoRadio estado,
    AppLocalizations l10n,
  ) {
    return showModalBottomSheet(
      context: context,
      showDragHandle: true,
      builder:
          (ctx) => SafeArea(
            child: Padding(
              padding: const EdgeInsets.all(24),
              child: Column(
                mainAxisSize: MainAxisSize.min,
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text(
                    l10n.sleepTimer,
                    style: Theme.of(ctx).textTheme.titleLarge,
                  ),
                  const SizedBox(height: 16),
                  if (estado.timer.activo)
                    FilledButton.tonal(
                      onPressed: () {
                        estado.cancelarTimer();
                        Navigator.pop(ctx);
                      },
                      child: Text(l10n.cancelTimer),
                    )
                  else
                    Wrap(
                      spacing: 8,
                      runSpacing: 8,
                      children: [
                        for (final segundos in estado.timerSuenoPresetsSegundos)
                          ActionChip(
                            label: Text(_formatearMinutos(l10n, segundos)),
                            onPressed: () {
                              estado.iniciarTimerDuracion(
                                Duration(seconds: segundos),
                              );
                              Navigator.pop(ctx);
                            },
                          ),
                      ],
                    ),
                ],
              ),
            ),
          ),
    );
  }

  String _formatearMinutos(AppLocalizations l10n, int segundos) {
    final d = Duration(seconds: segundos);
    final m = d.inMinutes.remainder(60).toString().padLeft(2, '0');
    final s = d.inSeconds.remainder(60).toString().padLeft(2, '0');
    if (d.inHours > 0) {
      return l10n.durationHoursMinutesSeconds(d.inHours, m, s);
    }
    return d.inSeconds.remainder(60) == 0
        ? l10n.durationMinutesOnly(d.inMinutes)
        : l10n.durationMinutesSeconds(d.inMinutes, s);
  }
}