import 'dart:async';

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

import '../estado/estado_grabacion.dart';
import '../l10n/gen/app_localizations.dart';
import '../modelos/archivo_grabacion.dart';
import '../tema/pluriwave_tokens.dart';
import '../widgets/pluri_glass_surface.dart';
import '../widgets/pluri_icon.dart';
import '../widgets/pluri_layout.dart';
import '../widgets/pluri_premium_widgets.dart';
import '../widgets/pluri_push_scaffold.dart';
import 'ajustes/pantalla_ajustes_grabaciones.dart';

/// Inline-preview playback + duration lookup for a single recording file at
/// a time (WU15, recordings-library spec — "Row playback starts and
/// stops"). Kept separate from `ServicioAudio` (never touched — that class
/// is coupled to live radio-stream transport/reconnect, unrelated to
/// previewing an already-finished local recording).
///
/// The real implementation ([_ReproductorGrabacionesJustAudio]) wraps
/// `just_audio.AudioPlayer`, which needs platform `MethodChannel`s this
/// suite does not mock — the same constraint `cola_local_test.dart`
/// documents for `PluriWaveAudioHandler` — so it is static-review-only.
/// Every test in `pantalla_grabaciones_test.dart` injects a fake instead.
abstract class ReproductorGrabaciones {
  /// Path currently loaded/playing, or null.
  String? get rutaActual;

  /// True while [rutaActual] is actively playing (not just loaded/paused).
  bool get reproduciendo;

  /// Loads [ruta]'s metadata and returns its duration, without playing it.
  Future<Duration?> duracionDe(String ruta);

  /// Starts playback of [ruta]. If [ruta] is already the one playing, this
  /// pauses it instead — the row's play/pause affordance is a toggle.
  Future<void> alternar(String ruta);

  Future<void> detener();
  Future<void> dispose();
}

class _ReproductorGrabacionesJustAudio implements ReproductorGrabaciones {
  final AudioPlayer _player = AudioPlayer();
  String? _rutaActual;

  @override
  String? get rutaActual => _rutaActual;

  @override
  bool get reproduciendo => _player.playing;

  @override
  Future<Duration?> duracionDe(String ruta) async {
    final sonda = AudioPlayer();
    try {
      return await sonda.setFilePath(ruta);
    } finally {
      await sonda.dispose();
    }
  }

  @override
  Future<void> alternar(String ruta) async {
    if (_rutaActual == ruta && _player.playing) {
      await _player.pause();
      return;
    }
    if (_rutaActual != ruta) {
      await _player.setFilePath(ruta);
      _rutaActual = ruta;
    }
    await _player.play();
  }

  @override
  Future<void> detener() async {
    await _player.stop();
    _rutaActual = null;
  }

  @override
  Future<void> dispose() => _player.dispose();
}

/// WU15: the recordings library — storage usage, browsable rows with
/// inline playback, and a "⋮" menu constrained to exactly
/// Rename/Open-in-another-app/Delete (`recordings-library` spec). Distinct
/// from `PantallaAjustesGrabaciones` (WU3b), which is the folder/size-limit
/// SETTINGS screen, not this browsable file list.
class PantallaGrabaciones extends StatefulWidget {
  const PantallaGrabaciones({
    super.key,
    ReproductorGrabaciones? reproductor,
    Future<bool> Function(String ruta)? abrirEnOtraApp,
  }) : _reproductorInyectado = reproductor,
       _abrirEnOtraAppInyectada = abrirEnOtraApp;

  final ReproductorGrabaciones? _reproductorInyectado;

  /// Seam for the local-open action. Was `compartir`, which handed the audio
  /// file to the system share sheet — redistribution of someone else's
  /// broadcast. It now opens the file in a player already installed on THIS
  /// device, and returns whether any app accepted it.
  final Future<bool> Function(String ruta)? _abrirEnOtraAppInyectada;

  @override
  State<PantallaGrabaciones> createState() => _PantallaGrabacionesState();
}

class _PantallaGrabacionesState extends State<PantallaGrabaciones> {
  late final ReproductorGrabaciones _reproductor =
      widget._reproductorInyectado ?? _ReproductorGrabacionesJustAudio();
  late final Future<bool> Function(String ruta) _abrirEnOtraApp =
      widget._abrirEnOtraAppInyectada ??
      (ruta) => context.read<EstadoGrabacion>().abrirGrabacion(ruta);

  late Future<List<ArchivoGrabacion>> _grabaciones;
  final Map<String, Future<Duration?>> _duracionCache = {};

  @override
  void initState() {
    super.initState();
    _recargar();
  }

  void _recargar() {
    _duracionCache.clear();
    _grabaciones = context.read<EstadoGrabacion>().listarGrabaciones();
  }

  @override
  void dispose() {
    unawaited(_reproductor.dispose());
    super.dispose();
  }

  Future<Duration?> _duracionPara(String ruta) =>
      _duracionCache.putIfAbsent(ruta, () => _reproductor.duracionDe(ruta));

  Future<void> _alternarReproduccion(String ruta) async {
    await _reproductor.alternar(ruta);
    if (!mounted) return;
    setState(() {});
  }

  Future<void> _manejarAccion(String accion, ArchivoGrabacion archivo) async {
    // Yield one microtask before opening any dialog: `PopupMenuButton`'s own
    // route is still popping off the Navigator at the moment `onSelected`
    // fires, and pushing a new route (showDialog) synchronously against
    // that in-flight pop can race its close transition.
    await Future<void>.delayed(Duration.zero);
    if (accion == 'rename') {
      await _renombrar(archivo);
      return;
    }
    if (accion == 'open') {
      await _abrirLocalmente(archivo);
      return;
    }
    if (accion == 'delete') {
      await _eliminar(archivo);
    }
  }

  /// Plays the user's own recording in another app on the same device. A
  /// device with no audio viewer installed (and the native side's own
  /// fallback to the containing folder failing too) returns `false` — the
  /// action then says so instead of looking like a dead menu entry.
  Future<void> _abrirLocalmente(ArchivoGrabacion archivo) async {
    final messenger = ScaffoldMessenger.of(context);
    final l10n = AppLocalizations.of(context);
    final abierto = await _abrirEnOtraApp(archivo.ruta);
    if (!mounted || abierto) return;
    messenger.showSnackBar(
      SnackBar(content: Text(l10n.recordingOpenNoAppError)),
    );
  }

  Future<void> _renombrar(ArchivoGrabacion archivo) async {
    final nuevoNombre = await showDialog<String>(
      context: context,
      builder: (_) => _DialogoRenombrarGrabacion(nombreActual: archivo.nombre),
    );
    if (nuevoNombre == null || nuevoNombre.trim().isEmpty) return;
    if (!mounted) return;
    await context.read<EstadoGrabacion>().renombrarGrabacion(
      archivo.ruta,
      nuevoNombre.trim(),
    );
    if (!mounted) return;
    setState(_recargar);
  }

  Future<void> _eliminar(ArchivoGrabacion archivo) async {
    final l10n = AppLocalizations.of(context);
    final confirmar = await showDialog<bool>(
      context: context,
      builder:
          (ctx) => AlertDialog(
            title: Text(l10n.recordingDeleteConfirmTitle),
            content: Text(l10n.recordingDeleteConfirmMessage),
            actions: [
              TextButton(
                onPressed: () => Navigator.pop(ctx, false),
                child: Text(l10n.cancelAction),
              ),
              FilledButton(
                onPressed: () => Navigator.pop(ctx, true),
                child: Text(l10n.recordingActionDelete),
              ),
            ],
          ),
    );
    if (confirmar != true) return;
    if (!mounted) return;
    await context.read<EstadoGrabacion>().eliminarGrabacion(archivo.ruta);
    if (!mounted) return;
    setState(_recargar);
  }

  String _formatearDuracion(Duration? d) {
    if (d == null) return '--:--';
    final m = d.inMinutes.remainder(60).toString().padLeft(2, '0');
    final s = d.inSeconds.remainder(60).toString().padLeft(2, '0');
    final h = d.inHours;
    return h > 0 ? '$h:$m:$s' : '$m:$s';
  }

  String _formatearFecha(DateTime fecha) {
    final dia = fecha.day.toString().padLeft(2, '0');
    final mes = fecha.month.toString().padLeft(2, '0');
    return '$dia/$mes/${fecha.year}';
  }

  String _formatearBytes(int bytes) {
    if (bytes < 1024) return '$bytes B';
    if (bytes < 1024 * 1024) return '${(bytes / 1024).toStringAsFixed(1)} KB';
    return '${(bytes / (1024 * 1024)).toStringAsFixed(1)} MB';
  }

  @override
  Widget build(BuildContext context) {
    final l10n = AppLocalizations.of(context);

    return PluriPushScaffold(
      title: l10n.recordingsLibraryTitle,
      actions: [
        IconButton(
          // Audit 12.1 (t4:610): the header action is `folder_open` at
          // 22px, not a generic gear.
          icon: const Icon(Icons.folder_open_rounded, size: 22),
          tooltip: l10n.recordingsLibrarySettingsTooltip,
          onPressed:
              () => PluriPushScaffold.push(
                context,
                (_) => const PantallaAjustesGrabaciones(),
              ),
        ),
      ],
      body: FutureBuilder<List<ArchivoGrabacion>>(
        future: _grabaciones,
        builder: (context, snap) {
          final archivos = snap.data ?? const <ArchivoGrabacion>[];
          return ListView(
            padding: PluriLayout.pageContentPadding,
            children: [
              _BarraDeAlmacenamiento(archivos: archivos),
              // Issue 3 (feedback-pruebas): t4:617 draws a 16px gap between
              // the storage card and the rows below it, not 12.
              const SizedBox(
                height: 16,
                key: ValueKey('grabaciones-storage-gap'),
              ),
              if (snap.connectionState == ConnectionState.done &&
                  archivos.isEmpty)
                PluriEmptyState(
                  glyph: PluriIconGlyph.player,
                  title: l10n.recordingsLibraryEmptyTitle,
                  subtitle: l10n.recordingsLibraryEmptySubtitle,
                )
              else
                // t4:618: `gap:2px` between rows.
                PluriPanelColumn(
                  gap: 2,
                  children: [
                    for (final archivo in archivos)
                      _FilaGrabacion(
                        archivo: archivo,
                        reproduciendo:
                            _reproductor.rutaActual == archivo.ruta &&
                            _reproductor.reproduciendo,
                        duracion: _duracionPara(archivo.ruta),
                        formatearDuracion: _formatearDuracion,
                        formatearFecha: _formatearFecha,
                        formatearBytes: _formatearBytes,
                        onAlternarReproduccion:
                            () => _alternarReproduccion(archivo.ruta),
                        onAccionMenu:
                            (accion) => _manejarAccion(accion, archivo),
                      ),
                  ],
                ),
              // Production-readiness pass: recording a broadcast holds up as
              // a private copy, and stops holding up the moment the product
              // reads as a redistribution tool. The library had no such
              // statement at all, while the manifest already publishes the
              // recordings folder to the system file manager
              // (RecordingsDocumentsProvider). Deliberately factual and
              // low-key — a footnote, not a warning banner — and always
              // visible, empty library included.
              const SizedBox(height: 16),
              Padding(
                key: const ValueKey('grabaciones-aviso-uso-privado'),
                padding: const EdgeInsets.symmetric(horizontal: 4),
                child: Text(
                  l10n.recordingsPrivateUseNotice,
                  style: Theme.of(context).textTheme.bodySmall?.copyWith(
                    color: Theme.of(
                      context,
                    ).textTheme.bodySmall?.color?.withValues(alpha: 0.7),
                  ),
                ),
              ),
            ],
          );
        },
      ),
    );
  }
}

class _BarraDeAlmacenamiento extends StatelessWidget {
  const _BarraDeAlmacenamiento({required this.archivos});

  final List<ArchivoGrabacion> archivos;

  @override
  Widget build(BuildContext context) {
    final l10n = AppLocalizations.of(context);
    final estado = context.watch<EstadoGrabacion>();
    final usadoBytes = archivos.fold<int>(0, (s, a) => s + a.tamanoBytes);
    final totalBytes = estado.maxBytes <= 0 ? 1 : estado.maxBytes;
    final fraccion = (usadoBytes / totalBytes).clamp(0.0, 1.0);
    final usadoMb = (usadoBytes / (1024 * 1024)).round();
    final totalMb = (totalBytes / (1024 * 1024)).round();

    return PluriGlassSurface(
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          // Audit 12.2 (t4 line 613): the bold "used of total" headline
          // sits ABOVE the bar -- was the bar first, then this same string
          // rendered small below it as the only caption.
          Text(
            l10n.recordingsLibraryStorageCaption(usadoMb, totalMb),
            style: Theme.of(
              context,
            ).textTheme.bodySmall?.copyWith(fontWeight: FontWeight.w800),
          ),
          const SizedBox(height: 8),
          // Audit 12.2: 6px bar, radius 3 (was minHeight 8, radius 8).
          ClipRRect(
            borderRadius: BorderRadius.circular(3),
            child: LinearProgressIndicator(value: fraccion, minHeight: 6),
          ),
          const SizedBox(height: 7),
          // Audit 12.3 (t4 line 613): the real caption names the folder
          // and the purge policy -- the generic "X of Y used" line moved
          // up to become the headline above, it never described either of
          // those.
          Text(
            l10n.recordingsLibraryStorageFolderCaption,
            style: Theme.of(context).textTheme.bodySmall,
          ),
        ],
      ),
    );
  }
}

class _FilaGrabacion extends StatelessWidget {
  const _FilaGrabacion({
    required this.archivo,
    required this.reproduciendo,
    required this.duracion,
    required this.formatearDuracion,
    required this.formatearFecha,
    required this.formatearBytes,
    required this.onAlternarReproduccion,
    required this.onAccionMenu,
  });

  final ArchivoGrabacion archivo;
  final bool reproduciendo;
  final Future<Duration?> duracion;
  final String Function(Duration?) formatearDuracion;
  final String Function(DateTime) formatearFecha;
  final String Function(int) formatearBytes;
  final VoidCallback onAlternarReproduccion;
  final ValueChanged<String> onAccionMenu;

  @override
  Widget build(BuildContext context) {
    final l10n = AppLocalizations.of(context);
    final theme = Theme.of(context);

    // Item 23 / audit 12.4 (t4:616-619): a flat, background-less row --
    // 44x44/radius-12 art placeholder (recordings carry no per-station
    // favicon, so this is a themed fallback square, not invented artwork),
    // name, meta line, a 24px play/pause affordance, and the SAME "-"
    // menu (Rename/Open in another app/Delete) as before, just restyled.
    return Padding(
      padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 10),
      child: Row(
        children: [
          ClipRRect(
            key: const ValueKey('fila-grabacion-arte'),
            borderRadius: BorderRadius.circular(12),
            child: Container(
              width: 44,
              height: 44,
              color: theme.colorScheme.primaryContainer,
              child: Icon(
                Icons.radio_rounded,
                size: 22,
                color: theme.colorScheme.onPrimaryContainer,
              ),
            ),
          ),
          const SizedBox(width: 12),
          Expanded(
            child: Column(
              mainAxisSize: MainAxisSize.min,
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                // t4:619: 14.5px/w700.
                Text(
                  archivo.nombre,
                  style: const TextStyle(
                    fontSize: 14.5,
                    fontWeight: FontWeight.w700,
                  ),
                  maxLines: 1,
                  overflow: TextOverflow.ellipsis,
                ),
                // t4:619: 12px/rgba(242,247,250,.55).
                FutureBuilder<Duration?>(
                  future: duracion,
                  builder: (context, snap) {
                    return Text(
                      '${formatearFecha(archivo.fecha)} · '
                      '${formatearDuracion(snap.data)} · '
                      '${formatearBytes(archivo.tamanoBytes)}',
                      style: TextStyle(
                        fontSize: 12,
                        color: theme.colorScheme.onSurface.withValues(
                          alpha: 0.55,
                        ),
                      ),
                      maxLines: 1,
                      overflow: TextOverflow.ellipsis,
                    );
                  },
                ),
              ],
            ),
          ),
          // t4:619: play_circle 24px brand teal in a 42x42 target.
          SizedBox(
            width: 42,
            height: 42,
            child: IconButton(
              padding: EdgeInsets.zero,
              tooltip: reproduciendo ? l10n.pauseAction : l10n.playAction,
              icon: Icon(
                reproduciendo
                    ? Icons.pause_circle_filled_rounded
                    : Icons.play_circle_fill_rounded,
                size: 24,
                color: PluriWaveTokens.brand,
              ),
              onPressed: onAlternarReproduccion,
            ),
          ),
          // t4:619: more_vert 20px/45% in a 38x42 target.
          SizedBox(
            width: 38,
            height: 42,
            child: PopupMenuButton<String>(
              padding: EdgeInsets.zero,
              icon: Icon(
                Icons.more_vert_rounded,
                size: 20,
                color: theme.colorScheme.onSurface.withValues(alpha: 0.45),
              ),
              onSelected: onAccionMenu,
              itemBuilder:
                  (context) => [
                    PopupMenuItem(
                      value: 'rename',
                      child: Text(l10n.recordingActionRename),
                    ),
                    PopupMenuItem(
                      value: 'open',
                      child: Text(l10n.recordingActionOpenIn),
                    ),
                    PopupMenuItem(
                      value: 'delete',
                      child: Text(l10n.recordingActionDelete),
                    ),
                  ],
            ),
          ),
        ],
      ),
    );
  }
}

/// Owns its own [TextEditingController] and disposes it in its own
/// [State.dispose] — the SAFE pattern documented for this codebase (see
/// `_DialogoEdicionDispositivo` in `pantalla_ajustes_salida_audio.dart`),
/// deliberately NOT the pre-existing anti-pattern (dispose right after the
/// sheet/dialog Future resolves, racing the close animation) already
/// tracked elsewhere in this codebase as a separate, un-fixed defect.
class _DialogoRenombrarGrabacion extends StatefulWidget {
  const _DialogoRenombrarGrabacion({required this.nombreActual});

  final String nombreActual;

  @override
  State<_DialogoRenombrarGrabacion> createState() =>
      _DialogoRenombrarGrabacionState();
}

class _DialogoRenombrarGrabacionState
    extends State<_DialogoRenombrarGrabacion> {
  late final _controller = TextEditingController(text: widget.nombreActual);
  String? _error;

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

  void _confirmar(AppLocalizations l10n) {
    final valor = _controller.text.trim();
    if (valor.isEmpty) {
      setState(() => _error = l10n.recordingRenameEmptyError);
      return;
    }
    Navigator.pop(context, valor);
  }

  @override
  Widget build(BuildContext context) {
    final l10n = AppLocalizations.of(context);
    return AlertDialog(
      title: Text(l10n.recordingRenameDialogTitle),
      content: TextField(
        controller: _controller,
        autofocus: true,
        decoration: InputDecoration(
          labelText: l10n.recordingRenameLabel,
          errorText: _error,
          border: const OutlineInputBorder(),
        ),
      ),
      actions: [
        TextButton(
          onPressed: () => Navigator.pop(context),
          child: Text(l10n.cancelAction),
        ),
        FilledButton(
          onPressed: () => _confirmar(l10n),
          child: Text(l10n.recordingActionRename),
        ),
      ],
    );
  }
}