farolero/lib/pantallas/pantalla_lobby_host.dart

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:qr_flutter/qr_flutter.dart';
import 'package:farolero/l10n/generated/app_localizations.dart';
import '../modelos/usuario.dart';
import '../servicios/servicio_nearby.dart';
import '../tema/tema_app.dart';

/// Pantalla de lobby del host: muestra QR y lista de jugadores conectados
class PantallaLobbyHost extends StatefulWidget {
  final String nombreSala;
  final VoidCallback onIniciar;

  const PantallaLobbyHost({
    super.key,
    required this.nombreSala,
    required this.onIniciar,
  });

  @override
  State<PantallaLobbyHost> createState() => _PantallaLobbyHostState();
}

class _PantallaLobbyHostState extends State<PantallaLobbyHost> {
  bool _iniciando = false;
  String? _perfilSeleccionado;

  @override
  Widget build(BuildContext context) {
    final l10n = AppLocalizations.of(context)!;
    final nearby = context.watch<ServicioNearby>();
    final jugadores = nearby.jugadores;
    final totalJugadores = jugadores.length + 1; // +1 host

    return Scaffold(
      appBar: AppBar(
        title: Text(widget.nombreSala),
        leading: IconButton(
          icon: const Icon(Icons.close),
          onPressed: () async {
            await nearby.desconectar();
            if (context.mounted) Navigator.pop(context);
          },
        ),
      ),
      body: Padding(
        padding: const EdgeInsets.all(24),
        child: Column(
          children: [
            // QR Code
            Container(
              padding: const EdgeInsets.all(16),
              decoration: BoxDecoration(
                color: Colors.white,
                borderRadius: BorderRadius.circular(16),
              ),
              child: QrImageView(
                data: nearby.generarDatosQR(widget.nombreSala),
                version: QrVersions.auto,
                size: 180,
                backgroundColor: Colors.white,
              ),
            ),
            const SizedBox(height: 12),
            Text(
              l10n.scanToJoin,
              style: Theme.of(context).textTheme.bodyMedium,
            ),
            const SizedBox(height: 24),

            // Selección de perfil
            Card(
              child: Padding(
                padding: const EdgeInsets.all(16),
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Text(
                      l10n.selectYourProfile,
                      style: Theme.of(context).textTheme.titleMedium,
                    ),
                    const SizedBox(height: 12),
                    DropdownButtonFormField<String>(
                      value: _perfilSeleccionado,
                      decoration: InputDecoration(
                        prefixIcon: const Icon(Icons.person),
                        hintText: l10n.selectProfile,
                        border: const OutlineInputBorder(),
                      ),
                      items: [
                        // Opción para crear nuevo usuario
                        DropdownMenuItem<String>(
                          value: '_new_',
                          child: Row(
                            children: [
                              const Icon(Icons.add, size: 18),
                              const SizedBox(width: 8),
                              Text(l10n.createNewUser),
                            ],
                          ),
                        ),
                        // Usuarios existentes
                        ...nearby.usuarios.map((usuario) {
                          return DropdownMenuItem<String>(
                            value: usuario.nombre,
                            child: Row(
                              children: [
                                Text(usuario.avatar ?? '👤'),
                                const SizedBox(width: 8),
                                Text(usuario.nombre),
                              ],
                            ),
                          );
                        }),
                      ],
                      onChanged: (valor) {
                        if (valor == '_new_') {
                          _crearNuevoUsuario(context);
                        } else {
                          setState(() => _perfilSeleccionado = valor);
                        }
                      },
                    ),
                  ],
                ),
              ),
            ),
            const SizedBox(height: 16),

            // Lista de jugadores
            Expanded(
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Row(
                    children: [
                      Text(
                        l10n.connectedPlayers,
                        style: Theme.of(context).textTheme.titleLarge,
                      ),
                      const Spacer(),
                      Container(
                        padding: const EdgeInsets.symmetric(
                          horizontal: 12,
                          vertical: 4,
                        ),
                        decoration: BoxDecoration(
                          color: totalJugadores >= 3
                              ? TemaApp.colorVerde.withValues(alpha: 0.2)
                              : TemaApp.colorNaranja.withValues(alpha: 0.2),
                          borderRadius: BorderRadius.circular(12),
                        ),
                        child: Text(
                          '$totalJugadores',
                          style: TextStyle(
                            color: totalJugadores >= 3
                                ? TemaApp.colorVerde
                                : TemaApp.colorNaranja,
                            fontWeight: FontWeight.bold,
                          ),
                        ),
                      ),
                    ],
                  ),
                  const SizedBox(height: 12),

                  // Host (yo)
                  _buildJugadorTile(
                    nombre: nearby.miNombre ?? 'Host',
                    esHost: true,
                  ),

                  // Jugadores conectados
                  Expanded(
                    child: jugadores.isEmpty
                        ? Center(
                            child: Column(
                              mainAxisSize: MainAxisSize.min,
                              children: [
                                const Text(
                                  '📱',
                                  style: TextStyle(fontSize: 48),
                                ),
                                const SizedBox(height: 12),
                                Text(
                                  l10n.waitingForPlayers,
                                  style: Theme.of(context).textTheme.bodyLarge,
                                ),
                              ],
                            ),
                          )
                        : ListView.builder(
                            itemCount: jugadores.length,
                            itemBuilder: (context, index) {
                              final j = jugadores[index];
                              return _buildJugadorTile(nombre: j.nombre);
                            },
                          ),
                  ),
                ],
              ),
            ),

            // Botón iniciar
            if (totalJugadores < 3)
              Text(
                l10n.needMorePlayers(3 - totalJugadores),
                style: Theme.of(
                  context,
                ).textTheme.bodyMedium?.copyWith(color: TemaApp.colorNaranja),
              ),
            const SizedBox(height: 12),
            if (_perfilSeleccionado == null)
              Text(
                l10n.selectProfile,
                style: Theme.of(
                  context,
                ).textTheme.bodyMedium?.copyWith(color: TemaApp.colorNaranja),
              ),
            const SizedBox(height: 12),
            SizedBox(
              width: double.infinity,
              child: ElevatedButton.icon(
                onPressed:
                    totalJugadores >= 3 &&
                        _perfilSeleccionado != null &&
                        !_iniciando
                    ? () {
                        setState(() => _iniciando = true);
                        widget.onIniciar();
                      }
                    : null,
                icon: const Icon(Icons.play_arrow),
                label: Text(_iniciando ? l10n.starting : l10n.startGame),
              ),
            ),
          ],
        ),
      ),
    );
  }

  Widget _buildJugadorTile({required String nombre, bool esHost = false}) {
    return Container(
      margin: const EdgeInsets.only(bottom: 8),
      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
      decoration: BoxDecoration(
        color: TemaApp.colorTarjeta,
        borderRadius: BorderRadius.circular(12),
        border: esHost
            ? Border.all(color: TemaApp.colorAcento.withValues(alpha: 0.5))
            : null,
      ),
      child: Row(
        children: [
          Text(esHost ? '👑' : '🎭', style: const TextStyle(fontSize: 20)),
          const SizedBox(width: 12),
          Expanded(
            child: Text(nombre, style: Theme.of(context).textTheme.titleMedium),
          ),
          if (esHost)
            Container(
              padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 2),
              decoration: BoxDecoration(
                color: TemaApp.colorAcento.withValues(alpha: 0.2),
                borderRadius: BorderRadius.circular(8),
              ),
              child: const Text(
                'HOST',
                style: TextStyle(
                  color: TemaApp.colorAcento,
                  fontSize: 10,
                  fontWeight: FontWeight.bold,
                ),
              ),
            ),
        ],
      ),
    );
  }

  Future<void> _crearNuevoUsuario(BuildContext context) async {
    final l10n = AppLocalizations.of(context)!;
    final controller = TextEditingController();
    final nearby = context.read<ServicioNearby>();

    final nombre = await showDialog<String>(
      context: context,
      builder: (ctx) => AlertDialog(
        title: Text(l10n.createNewUser),
        content: TextField(
          controller: controller,
          autofocus: true,
          textCapitalization: TextCapitalization.words,
          decoration: InputDecoration(
            hintText: l10n.yourName,
            prefixIcon: const Icon(Icons.person),
          ),
          onSubmitted: (v) => Navigator.pop(ctx, v),
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(ctx),
            child: Text(l10n.cancel),
          ),
          TextButton(
            onPressed: () => Navigator.pop(ctx, controller.text),
            child: Text(l10n.accept),
          ),
        ],
      ),
    );

    if (nombre != null && nombre.trim().isNotEmpty) {
      final nuevoUsuario = Usuario(
        id: DateTime.now().millisecondsSinceEpoch.toString(),
        nombre: nombre.trim(),
      );
      nearby.agregarUsuario(nuevoUsuario);
      setState(() => _perfilSeleccionado = nombre.trim());
    }
  }
}