import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';

import '../../core/services/auth_controller.dart';
import '../../core/theme/app_theme.dart';
import '../../core/widgets/app_widgets.dart';
import 'data/admin_service.dart';
import 'models/admin_driver.dart';
import 'models/admin_route.dart';
import 'models/admin_unit.dart';
import 'models/admin_user.dart';
import 'providers/admin_providers.dart';

class AdminScreen extends ConsumerStatefulWidget {
  const AdminScreen({super.key});

  @override
  ConsumerState<AdminScreen> createState() => _AdminScreenState();
}

class _AdminScreenState extends ConsumerState<AdminScreen>
    with SingleTickerProviderStateMixin {
  late final TabController _tabController;
  int _activeTab = 0;

  @override
  void initState() {
    super.initState();
    _tabController = TabController(length: 3, vsync: this)
      ..addListener(() {
        if (!_tabController.indexIsChanging) {
          setState(() => _activeTab = _tabController.index);
        }
      });
  }

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

  AdminService get _service => ref.read(adminServiceProvider);

  void _snack(String msg, {bool error = false}) {
    if (!mounted) return;
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(
        content: Text(msg),
        backgroundColor: error ? AppTheme.danger : AppTheme.primary,
      ),
    );
  }

  Future<void> _handleAdd() async {
    switch (_activeTab) {
      case 0:
        await _showUserForm();
        break;
      case 1:
        await _showRouteForm();
        break;
      case 2:
        await _showUnitForm();
        break;
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: AppTheme.background,
      appBar: AppBar(
        title: const Text('Panel de administración'),
        actions: [
          IconButton(
            tooltip: 'Refrescar',
            icon: const Icon(Icons.refresh),
            onPressed: () {
              ref.invalidate(adminUsersProvider);
              ref.invalidate(adminRoutesProvider);
              ref.invalidate(adminUnitsProvider);
              ref.invalidate(adminDriversProvider);
            },
          ),
          IconButton(
            tooltip: 'Cerrar sesión',
            icon: const Icon(Icons.logout),
            onPressed: () async {
              await ref.read(authControllerProvider.notifier).logout();
              if (mounted) context.go('/login');
            },
          ),
        ],
        bottom: TabBar(
          controller: _tabController,
          indicatorColor: Colors.white,
          labelColor: Colors.white,
          unselectedLabelColor: Colors.white70,
          tabs: const [
            Tab(text: 'Usuarios'),
            Tab(text: 'Rutas'),
            Tab(text: 'Camiones'),
          ],
        ),
      ),
      body: TabBarView(
        controller: _tabController,
        children: const [_UsersTab(), _RoutesTab(), _TrucksTab()],
      ),
      floatingActionButton: FloatingActionButton.extended(
        onPressed: _handleAdd,
        backgroundColor: AppTheme.primary,
        icon: const Icon(Icons.add),
        label: Text(
          _activeTab == 0
              ? 'Nuevo usuario'
              : _activeTab == 1
              ? 'Nueva ruta'
              : 'Nuevo camión',
        ),
      ),
    );
  }

  // ── Formulario usuario ──────────────────────────────────────────────────────
  Future<void> _showUserForm({AdminUserModel? user}) async {
    final isEdit = user != null;
    final nombre = TextEditingController(text: user?.name ?? '');
    final email = TextEditingController(text: user?.email ?? '');
    final telefono = TextEditingController(text: user?.phone ?? '');
    final password = TextEditingController();
    String role = user?.role ?? 'citizen';
    final formKey = GlobalKey<FormState>();

    final saved = await showDialog<bool>(
      context: context,
      builder: (ctx) {
        return StatefulBuilder(
          builder: (ctx, setStateDialog) {
            return AlertDialog(
              backgroundColor: AppTheme.surface,
              shape: RoundedRectangleBorder(
                borderRadius: BorderRadius.circular(AppTheme.radiusLg),
              ),
              title: Text(isEdit ? 'Editar usuario' : 'Nuevo usuario'),
              content: Form(
                key: formKey,
                child: SingleChildScrollView(
                  child: Column(
                    mainAxisSize: MainAxisSize.min,
                    children: [
                      _textField(nombre, 'Nombre', required: true),
                      const SizedBox(height: 10),
                      _textField(
                        email,
                        'Email',
                        keyboardType: TextInputType.emailAddress,
                      ),
                      const SizedBox(height: 10),
                      if (!isEdit) ...[
                        _textField(
                          telefono,
                          'Teléfono',
                          keyboardType: TextInputType.phone,
                        ),
                        const SizedBox(height: 10),
                        _textField(
                          password,
                          'Contraseña (mín. 6)',
                          obscure: true,
                          required: true,
                          validator: (v) => (v == null || v.length < 6)
                              ? 'Mínimo 6 caracteres'
                              : null,
                        ),
                        const SizedBox(height: 10),
                      ],
                      DropdownButtonFormField<String>(
                        initialValue: role,
                        decoration: InputDecoration(
                          labelText: 'Rol',
                          border: OutlineInputBorder(
                            borderRadius: BorderRadius.circular(
                              AppTheme.radiusMd,
                            ),
                          ),
                        ),
                        items: const [
                          DropdownMenuItem(
                            value: 'citizen',
                            child: Text('Ciudadano'),
                          ),
                          DropdownMenuItem(
                            value: 'driver',
                            child: Text('Conductor'),
                          ),
                          DropdownMenuItem(
                            value: 'admin',
                            child: Text('Administrador'),
                          ),
                        ],
                        onChanged: (v) {
                          if (v != null) setStateDialog(() => role = v);
                        },
                      ),
                    ],
                  ),
                ),
              ),
              actions: [
                TextButton(
                  onPressed: () => Navigator.pop(ctx, false),
                  child: const Text('Cancelar'),
                ),
                ElevatedButton(
                  onPressed: () async {
                    if (!formKey.currentState!.validate()) return;
                    try {
                      if (isEdit) {
                        await _service.updateUser(
                          user.id,
                          name: nombre.text.trim(),
                          email: email.text.trim().isEmpty
                              ? null
                              : email.text.trim(),
                          role: role,
                        );
                      } else {
                        if (email.text.trim().isEmpty &&
                            telefono.text.trim().isEmpty) {
                          _snack('Email o teléfono es requerido', error: true);
                          return;
                        }
                        await _service.createUser(
                          name: nombre.text.trim(),
                          password: password.text,
                          email: email.text.trim().isEmpty
                              ? null
                              : email.text.trim(),
                          phone: telefono.text.trim().isEmpty
                              ? null
                              : telefono.text.trim(),
                          role: role,
                        );
                      }
                      if (ctx.mounted) Navigator.pop(ctx, true);
                    } catch (e) {
                      _snack('Error: ${_errMsg(e)}', error: true);
                    }
                  },
                  child: const Text('Guardar'),
                ),
              ],
            );
          },
        );
      },
    );

    if (saved == true) {
      ref.invalidate(adminUsersProvider);
      ref.invalidate(adminDriversProvider);
      _snack(isEdit ? 'Usuario actualizado' : 'Usuario creado');
    }
  }

  // ── Formulario ruta ─────────────────────────────────────────────────────────
  Future<void> _showRouteForm({AdminRouteModel? route}) async {
    final isEdit = route != null;
    final id = TextEditingController(text: route?.id ?? '');
    final nombre = TextEditingController(text: route?.name ?? '');
    String? turno = route?.turno;
    String status = route?.status ?? 'pendiente';
    int? truckId = route?.truckId;
    final formKey = GlobalKey<FormState>();
    final units = ref
        .read(adminUnitsProvider)
        .maybeWhen(data: (u) => u, orElse: () => <AdminUnitModel>[]);

    final saved = await showDialog<bool>(
      context: context,
      builder: (ctx) {
        return StatefulBuilder(
          builder: (ctx, setStateDialog) {
            return AlertDialog(
              backgroundColor: AppTheme.surface,
              shape: RoundedRectangleBorder(
                borderRadius: BorderRadius.circular(AppTheme.radiusLg),
              ),
              title: Text(isEdit ? 'Editar ruta' : 'Nueva ruta'),
              content: Form(
                key: formKey,
                child: SingleChildScrollView(
                  child: Column(
                    mainAxisSize: MainAxisSize.min,
                    children: [
                      _textField(
                        id,
                        'ID (ej. RUTA-01)',
                        required: true,
                        enabled: !isEdit,
                      ),
                      const SizedBox(height: 10),
                      _textField(nombre, 'Nombre'),
                      const SizedBox(height: 10),
                      DropdownButtonFormField<String?>(
                        initialValue: turno,
                        decoration: InputDecoration(
                          labelText: 'Turno',
                          border: OutlineInputBorder(
                            borderRadius: BorderRadius.circular(
                              AppTheme.radiusMd,
                            ),
                          ),
                        ),
                        items: const [
                          DropdownMenuItem<String?>(
                            value: null,
                            child: Text('—'),
                          ),
                          DropdownMenuItem<String?>(
                            value: 'matutino',
                            child: Text('Matutino'),
                          ),
                          DropdownMenuItem<String?>(
                            value: 'vespertino',
                            child: Text('Vespertino'),
                          ),
                        ],
                        onChanged: (v) => setStateDialog(() => turno = v),
                      ),
                      const SizedBox(height: 10),
                      DropdownButtonFormField<String>(
                        initialValue: status,
                        decoration: InputDecoration(
                          labelText: 'Status',
                          border: OutlineInputBorder(
                            borderRadius: BorderRadius.circular(
                              AppTheme.radiusMd,
                            ),
                          ),
                        ),
                        items: const [
                          DropdownMenuItem(
                            value: 'pendiente',
                            child: Text('Pendiente'),
                          ),
                          DropdownMenuItem(
                            value: 'en_ruta',
                            child: Text('En ruta'),
                          ),
                          DropdownMenuItem(
                            value: 'completada',
                            child: Text('Completada'),
                          ),
                          DropdownMenuItem(
                            value: 'diferida',
                            child: Text('Diferida'),
                          ),
                          DropdownMenuItem(
                            value: 'reasignada',
                            child: Text('Reasignada'),
                          ),
                        ],
                        onChanged: (v) {
                          if (v != null) setStateDialog(() => status = v);
                        },
                      ),
                      const SizedBox(height: 10),
                      DropdownButtonFormField<int?>(
                        initialValue: truckId,
                        decoration: InputDecoration(
                          labelText: 'Camión asignado',
                          border: OutlineInputBorder(
                            borderRadius: BorderRadius.circular(
                              AppTheme.radiusMd,
                            ),
                          ),
                        ),
                        items: [
                          const DropdownMenuItem<int?>(
                            value: null,
                            child: Text('Sin asignar'),
                          ),
                          ...units.map(
                            (u) => DropdownMenuItem<int?>(
                              value: u.id,
                              child: Text('${u.displayPlate} (#${u.id})'),
                            ),
                          ),
                        ],
                        onChanged: (v) => setStateDialog(() => truckId = v),
                      ),
                    ],
                  ),
                ),
              ),
              actions: [
                TextButton(
                  onPressed: () => Navigator.pop(ctx, false),
                  child: const Text('Cancelar'),
                ),
                ElevatedButton(
                  onPressed: () async {
                    if (!formKey.currentState!.validate()) return;
                    try {
                      if (isEdit) {
                        await _service.updateRoute(
                          route.id,
                          name: nombre.text.trim(),
                          truckId: truckId,
                          turno: turno,
                          status: status,
                        );
                      } else {
                        await _service.createRoute(
                          id: id.text.trim(),
                          name: nombre.text.trim().isEmpty
                              ? null
                              : nombre.text.trim(),
                          truckId: truckId,
                          turno: turno,
                          status: status,
                        );
                      }
                      if (ctx.mounted) Navigator.pop(ctx, true);
                    } catch (e) {
                      _snack('Error: ${_errMsg(e)}', error: true);
                    }
                  },
                  child: const Text('Guardar'),
                ),
              ],
            );
          },
        );
      },
    );

    if (saved == true) {
      ref.invalidate(adminRoutesProvider);
      _snack(isEdit ? 'Ruta actualizada' : 'Ruta creada');
    }
  }

  // ── Formulario camión (unit) ────────────────────────────────────────────────
  Future<void> _showUnitForm({AdminUnitModel? unit}) async {
    final isEdit = unit != null;
    final idCtrl = TextEditingController(text: unit?.id.toString() ?? '');
    final plate = TextEditingController(text: unit?.plate ?? '');
    String status = unit?.status ?? 'active';
    final formKey = GlobalKey<FormState>();

    final saved = await showDialog<bool>(
      context: context,
      builder: (ctx) {
        return StatefulBuilder(
          builder: (ctx, setStateDialog) {
            return AlertDialog(
              backgroundColor: AppTheme.surface,
              shape: RoundedRectangleBorder(
                borderRadius: BorderRadius.circular(AppTheme.radiusLg),
              ),
              title: Text(isEdit ? 'Editar camión' : 'Nuevo camión'),
              content: Form(
                key: formKey,
                child: SingleChildScrollView(
                  child: Column(
                    mainAxisSize: MainAxisSize.min,
                    children: [
                      _textField(
                        idCtrl,
                        'ID numérico (ej. 101)',
                        keyboardType: TextInputType.number,
                        required: true,
                        enabled: !isEdit,
                        validator: (v) {
                          if (v == null || v.trim().isEmpty) return 'Requerido';
                          if (int.tryParse(v) == null)
                            return 'Debe ser numérico';
                          return null;
                        },
                      ),
                      const SizedBox(height: 10),
                      _textField(plate, 'Placa'),
                      const SizedBox(height: 10),
                      DropdownButtonFormField<String>(
                        initialValue: status,
                        decoration: InputDecoration(
                          labelText: 'Estado',
                          border: OutlineInputBorder(
                            borderRadius: BorderRadius.circular(
                              AppTheme.radiusMd,
                            ),
                          ),
                        ),
                        items: const [
                          DropdownMenuItem(
                            value: 'active',
                            child: Text('Activo'),
                          ),
                          DropdownMenuItem(
                            value: 'inactive',
                            child: Text('Inactivo'),
                          ),
                          DropdownMenuItem(
                            value: 'maintenance',
                            child: Text('Mantenimiento'),
                          ),
                        ],
                        onChanged: (v) {
                          if (v != null) setStateDialog(() => status = v);
                        },
                      ),
                    ],
                  ),
                ),
              ),
              actions: [
                TextButton(
                  onPressed: () => Navigator.pop(ctx, false),
                  child: const Text('Cancelar'),
                ),
                ElevatedButton(
                  onPressed: () async {
                    if (!formKey.currentState!.validate()) return;
                    try {
                      if (isEdit) {
                        await _service.updateUnit(
                          unit.id,
                          plate: plate.text.trim().isEmpty
                              ? null
                              : plate.text.trim(),
                          status: status,
                        );
                      } else {
                        await _service.createUnit(
                          id: int.parse(idCtrl.text.trim()),
                          plate: plate.text.trim().isEmpty
                              ? null
                              : plate.text.trim(),
                          status: status,
                        );
                      }
                      if (ctx.mounted) Navigator.pop(ctx, true);
                    } catch (e) {
                      _snack('Error: ${_errMsg(e)}', error: true);
                    }
                  },
                  child: const Text('Guardar'),
                ),
              ],
            );
          },
        );
      },
    );

    if (saved == true) {
      ref.invalidate(adminUnitsProvider);
      ref.invalidate(adminRoutesProvider);
      _snack(isEdit ? 'Camión actualizado' : 'Camión creado');
    }
  }

  // ── Helpers ─────────────────────────────────────────────────────────────────
  Widget _textField(
    TextEditingController controller,
    String label, {
    TextInputType keyboardType = TextInputType.text,
    bool obscure = false,
    bool required = false,
    bool enabled = true,
    String? Function(String?)? validator,
  }) {
    return TextFormField(
      controller: controller,
      keyboardType: keyboardType,
      obscureText: obscure,
      enabled: enabled,
      validator:
          validator ??
          (required
              ? (v) =>
                    (v == null || v.trim().isEmpty) ? 'Campo requerido' : null
              : null),
      decoration: InputDecoration(
        labelText: label,
        border: OutlineInputBorder(
          borderRadius: BorderRadius.circular(AppTheme.radiusMd),
        ),
      ),
    );
  }

  String _errMsg(Object e) {
    final s = e.toString();
    return s.length > 220 ? '${s.substring(0, 220)}…' : s;
  }
}

// ── Tabs ──────────────────────────────────────────────────────────────────────
class _UsersTab extends ConsumerWidget {
  const _UsersTab();

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final async = ref.watch(adminUsersProvider);
    return async.when(
      loading: () => const Center(child: CircularProgressIndicator()),
      error: (e, _) => _ErrorView(
        message: e.toString(),
        onRetry: () => ref.invalidate(adminUsersProvider),
      ),
      data: (users) {
        if (users.isEmpty) {
          return const _EmptyView('No hay usuarios registrados.');
        }
        return ListView.separated(
          padding: const EdgeInsets.fromLTRB(16, 16, 16, 96),
          itemCount: users.length,
          separatorBuilder: (_, __) => const SizedBox(height: 12),
          itemBuilder: (context, i) {
            final u = users[i];
            return AppCard(
              child: Row(
                children: [
                  CircleAvatar(
                    backgroundColor: AppTheme.primaryLight,
                    foregroundColor: AppTheme.primary,
                    child: Text(u.initials),
                  ),
                  const SizedBox(width: 14),
                  Expanded(
                    child: Column(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: [
                        Text(
                          u.displayName,
                          style: const TextStyle(
                            fontSize: 15,
                            fontWeight: FontWeight.w600,
                          ),
                        ),
                        const SizedBox(height: 4),
                        if (u.email != null && u.email!.isNotEmpty)
                          Text(
                            u.email!,
                            style: const TextStyle(
                              fontSize: 13,
                              color: AppTheme.textSecondary,
                            ),
                          ),
                        if (u.phone != null && u.phone!.isNotEmpty)
                          Text(u.phone!, style: const TextStyle(fontSize: 13)),
                        const SizedBox(height: 4),
                        _roleBadge(u.role),
                      ],
                    ),
                  ),
                  IconButton(
                    icon: const Icon(
                      Icons.edit_outlined,
                      color: AppTheme.primary,
                    ),
                    onPressed: () {
                      final state = context
                          .findAncestorStateOfType<_AdminScreenState>();
                      state?._showUserForm(user: u);
                    },
                  ),
                  IconButton(
                    icon: const Icon(
                      Icons.delete_outline,
                      color: AppTheme.danger,
                    ),
                    onPressed: () => _confirmAndDelete(
                      context,
                      tipo: 'usuario',
                      onConfirm: () async {
                        await ref.read(adminServiceProvider).deleteUser(u.id);
                        ref.invalidate(adminUsersProvider);
                        ref.invalidate(adminDriversProvider);
                      },
                    ),
                  ),
                ],
              ),
            );
          },
        );
      },
    );
  }

  Widget _roleBadge(String role) {
    switch (role) {
      case 'admin':
        return AppStatusBadge.amber('Administrador');
      case 'driver':
        return AppStatusBadge.green('Conductor');
      default:
        return AppStatusBadge.gray('Ciudadano');
    }
  }
}

class _RoutesTab extends ConsumerWidget {
  const _RoutesTab();

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final async = ref.watch(adminRoutesProvider);
    final units = ref
        .watch(adminUnitsProvider)
        .maybeWhen(data: (u) => u, orElse: () => <AdminUnitModel>[]);

    return async.when(
      loading: () => const Center(child: CircularProgressIndicator()),
      error: (e, _) => _ErrorView(
        message: e.toString(),
        onRetry: () => ref.invalidate(adminRoutesProvider),
      ),
      data: (routes) {
        if (routes.isEmpty) {
          return const _EmptyView('No hay rutas registradas.');
        }
        return ListView.separated(
          padding: const EdgeInsets.fromLTRB(16, 16, 16, 96),
          itemCount: routes.length,
          separatorBuilder: (_, __) => const SizedBox(height: 12),
          itemBuilder: (context, i) {
            final r = routes[i];
            AdminUnitModel? unit;
            if (r.truckId != null) {
              for (final u in units) {
                if (u.id == r.truckId) {
                  unit = u;
                  break;
                }
              }
            }
            return AppCard(
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Row(
                    children: [
                      Expanded(
                        child: Text(
                          r.displayName,
                          style: const TextStyle(
                            fontSize: 15,
                            fontWeight: FontWeight.w600,
                          ),
                        ),
                      ),
                      _routeStatusBadge(r.status),
                    ],
                  ),
                  const SizedBox(height: 6),
                  Text(
                    'ID: ${r.id}',
                    style: const TextStyle(
                      fontSize: 12,
                      color: AppTheme.textSecondary,
                    ),
                  ),
                  if (r.turno != null)
                    Text(
                      'Turno: ${r.turno}',
                      style: const TextStyle(fontSize: 13),
                    ),
                  Text(
                    'Camión: ${unit?.displayPlate ?? (r.truckId == null ? 'Sin asignar' : '#${r.truckId}')}',
                    style: const TextStyle(
                      fontSize: 13,
                      color: AppTheme.textSecondary,
                    ),
                  ),
                  Text(
                    'Posición actual: ${r.currentPositionId}/8',
                    style: const TextStyle(
                      fontSize: 12,
                      color: AppTheme.textSecondary,
                    ),
                  ),
                  const SizedBox(height: 12),
                  Row(
                    mainAxisAlignment: MainAxisAlignment.end,
                    children: [
                      TextButton.icon(
                        onPressed: () {
                          final state = context
                              .findAncestorStateOfType<_AdminScreenState>();
                          state?._showRouteForm(route: r);
                        },
                        icon: const Icon(Icons.edit_outlined, size: 18),
                        label: const Text('Editar'),
                      ),
                      const SizedBox(width: 8),
                      TextButton.icon(
                        onPressed: () => _confirmAndDelete(
                          context,
                          tipo: 'ruta',
                          onConfirm: () async {
                            await ref
                                .read(adminServiceProvider)
                                .deleteRoute(r.id);
                            ref.invalidate(adminRoutesProvider);
                          },
                        ),
                        icon: const Icon(Icons.delete_outline, size: 18),
                        label: const Text('Eliminar'),
                        style: TextButton.styleFrom(
                          foregroundColor: AppTheme.danger,
                        ),
                      ),
                    ],
                  ),
                ],
              ),
            );
          },
        );
      },
    );
  }

  Widget _routeStatusBadge(String status) {
    switch (status) {
      case 'en_ruta':
        return AppStatusBadge.amber('En ruta');
      case 'completada':
        return AppStatusBadge.green('Completada');
      case 'diferida':
        return AppStatusBadge.danger('Diferida');
      case 'reasignada':
        return AppStatusBadge.amber('Reasignada');
      default:
        return AppStatusBadge.gray('Pendiente');
    }
  }
}

class _TrucksTab extends ConsumerWidget {
  const _TrucksTab();

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final async = ref.watch(adminUnitsProvider);
    final routes = ref
        .watch(adminRoutesProvider)
        .maybeWhen(data: (r) => r, orElse: () => <AdminRouteModel>[]);
    final drivers = ref
        .watch(adminDriversProvider)
        .maybeWhen(data: (d) => d, orElse: () => <AdminDriverModel>[]);

    return async.when(
      loading: () => const Center(child: CircularProgressIndicator()),
      error: (e, _) => _ErrorView(
        message: e.toString(),
        onRetry: () => ref.invalidate(adminUnitsProvider),
      ),
      data: (units) {
        if (units.isEmpty) {
          return const _EmptyView('No hay camiones registrados.');
        }
        return ListView.separated(
          padding: const EdgeInsets.fromLTRB(16, 16, 16, 96),
          itemCount: units.length,
          separatorBuilder: (_, __) => const SizedBox(height: 12),
          itemBuilder: (context, i) {
            final t = units[i];
            AdminRouteModel? assignedRoute;
            for (final r in routes) {
              if (r.truckId == t.id) {
                assignedRoute = r;
                break;
              }
            }
            AdminDriverModel? assignedDriver;
            for (final d in drivers) {
              if (d.unitId == t.id) {
                assignedDriver = d;
                break;
              }
            }
            return AppCard(
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Row(
                    children: [
                      Expanded(
                        child: Text(
                          t.displayPlate,
                          style: const TextStyle(
                            fontSize: 15,
                            fontWeight: FontWeight.w600,
                          ),
                        ),
                      ),
                      _unitStatusBadge(t.status),
                    ],
                  ),
                  const SizedBox(height: 6),
                  Text(
                    'ID: #${t.id}',
                    style: const TextStyle(
                      fontSize: 12,
                      color: AppTheme.textSecondary,
                    ),
                  ),
                  Text(
                    'Conductor: ${assignedDriver?.displayName ?? 'Sin asignar'}',
                    style: const TextStyle(fontSize: 13),
                  ),
                  Text(
                    'Ruta: ${assignedRoute?.displayName ?? 'Sin asignar'}',
                    style: const TextStyle(
                      fontSize: 13,
                      color: AppTheme.textSecondary,
                    ),
                  ),
                  const SizedBox(height: 12),
                  Row(
                    mainAxisAlignment: MainAxisAlignment.end,
                    children: [
                      TextButton.icon(
                        onPressed: () {
                          final state = context
                              .findAncestorStateOfType<_AdminScreenState>();
                          state?._showUnitForm(unit: t);
                        },
                        icon: const Icon(Icons.edit_outlined, size: 18),
                        label: const Text('Editar'),
                      ),
                      const SizedBox(width: 8),
                      TextButton.icon(
                        onPressed: () => _confirmAndDelete(
                          context,
                          tipo: 'camión',
                          onConfirm: () async {
                            await ref
                                .read(adminServiceProvider)
                                .deleteUnit(t.id);
                            ref.invalidate(adminUnitsProvider);
                            ref.invalidate(adminRoutesProvider);
                          },
                        ),
                        icon: const Icon(Icons.delete_outline, size: 18),
                        label: const Text('Eliminar'),
                        style: TextButton.styleFrom(
                          foregroundColor: AppTheme.danger,
                        ),
                      ),
                    ],
                  ),
                ],
              ),
            );
          },
        );
      },
    );
  }

  Widget _unitStatusBadge(String status) {
    switch (status) {
      case 'inactive':
        return AppStatusBadge.gray('Inactivo');
      case 'maintenance':
        return AppStatusBadge.amber('Mantenimiento');
      default:
        return AppStatusBadge.green('Activo');
    }
  }
}

// ── Shared widgets ────────────────────────────────────────────────────────────
class _EmptyView extends StatelessWidget {
  const _EmptyView(this.message);
  final String message;

  @override
  Widget build(BuildContext context) => Center(
    child: Padding(
      padding: const EdgeInsets.all(24),
      child: Text(
        message,
        textAlign: TextAlign.center,
        style: const TextStyle(fontSize: 15, color: AppTheme.textSecondary),
      ),
    ),
  );
}

class _ErrorView extends StatelessWidget {
  const _ErrorView({required this.message, required this.onRetry});
  final String message;
  final VoidCallback onRetry;

  @override
  Widget build(BuildContext context) => Center(
    child: Padding(
      padding: const EdgeInsets.all(24),
      child: Column(
        mainAxisSize: MainAxisSize.min,
        children: [
          const Icon(Icons.error_outline, color: AppTheme.danger, size: 48),
          const SizedBox(height: 12),
          Text(
            message,
            textAlign: TextAlign.center,
            style: const TextStyle(fontSize: 13, color: AppTheme.textSecondary),
          ),
          const SizedBox(height: 16),
          ElevatedButton.icon(
            onPressed: onRetry,
            icon: const Icon(Icons.refresh),
            label: const Text('Reintentar'),
          ),
        ],
      ),
    ),
  );
}

void _confirmAndDelete(
  BuildContext context, {
  required String tipo,
  required Future<void> Function() onConfirm,
}) {
  showDialog(
    context: context,
    builder: (ctx) => AlertDialog(
      backgroundColor: AppTheme.surface,
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(AppTheme.radiusLg),
      ),
      title: Text('Eliminar $tipo'),
      content: Text('¿Deseas eliminar este $tipo?'),
      actions: [
        TextButton(
          onPressed: () => Navigator.pop(ctx),
          style: TextButton.styleFrom(foregroundColor: AppTheme.textSecondary),
          child: const Text('Cancelar'),
        ),
        TextButton(
          onPressed: () async {
            Navigator.pop(ctx);
            try {
              await onConfirm();
              if (context.mounted) {
                ScaffoldMessenger.of(
                  context,
                ).showSnackBar(SnackBar(content: Text('$tipo eliminado')));
              }
            } catch (e) {
              if (context.mounted) {
                ScaffoldMessenger.of(context).showSnackBar(
                  SnackBar(
                    content: Text('Error: $e'),
                    backgroundColor: AppTheme.danger,
                  ),
                );
              }
            }
          },
          style: TextButton.styleFrom(foregroundColor: AppTheme.danger),
          child: const Text('Eliminar'),
        ),
      ],
    ),
  );
}

// ── Legacy stubs (no longer used; kept enum to avoid breaking imports) ────────
enum _LegacyTruckStatus { disponible, enRuta, mantenimiento, detenido }

extension TruckStatusX on TruckStatus {
  String get label => switch (this) {
    TruckStatus.disponible => 'Disponible',
    TruckStatus.enRuta => 'En ruta',
    TruckStatus.mantenimiento => 'Mantenimiento',
    TruckStatus.detenido => 'Detenido',
  };

  AppStatusBadge get badge => switch (this) {
    TruckStatus.disponible => AppStatusBadge.green(label),
    TruckStatus.enRuta => AppStatusBadge.amber(label),
    TruckStatus.mantenimiento => AppStatusBadge.gray(label),
    TruckStatus.detenido => AppStatusBadge.gray(label),
  };
}

class _AdminUser {
  final String id, nombre, apellido, email, telefono;
  const _AdminUser({
    required this.id,
    required this.nombre,
    required this.apellido,
    required this.email,
    required this.telefono,
  });
  String get nombreCompleto => '$nombre $apellido';
  String get iniciales =>
      '${nombre.isNotEmpty ? nombre[0] : ''}${apellido.isNotEmpty ? apellido[0] : ''}'
          .toUpperCase();
  _AdminUser copyWith({
    String? nombre,
    String? apellido,
    String? email,
    String? telefono,
  }) => _AdminUser(
    id: id,
    nombre: nombre ?? this.nombre,
    apellido: apellido ?? this.apellido,
    email: email ?? this.email,
    telefono: telefono ?? this.telefono,
  );
}

class _AdminRoute {
  final String id, nombre, zona;
  final bool activa;
  const _AdminRoute({
    required this.id,
    required this.nombre,
    required this.zona,
    this.activa = true,
  });
  _AdminRoute copyWith({String? nombre, String? zona, bool? activa}) =>
      _AdminRoute(
        id: id,
        nombre: nombre ?? this.nombre,
        zona: zona ?? this.zona,
        activa: activa ?? this.activa,
      );
}

class _AdminTruck {
  final String id, placas, modelo, conductor, rutaId;
  final TruckStatus status;
  const _AdminTruck({
    required this.id,
    required this.placas,
    required this.modelo,
    required this.conductor,
    required this.status,
    required this.rutaId,
  });
  _AdminTruck copyWith({
    String? placas,
    String? modelo,
    String? conductor,
    TruckStatus? status,
    String? rutaId,
  }) => _AdminTruck(
    id: id,
    placas: placas ?? this.placas,
    modelo: modelo ?? this.modelo,
    conductor: conductor ?? this.conductor,
    status: status ?? this.status,
    rutaId: rutaId ?? this.rutaId,
  );
}

// ── Pantalla ──────────────────────────────────────────────────────────────────
class AdminScreen extends StatefulWidget {
  const AdminScreen({super.key});

  @override
  State<AdminScreen> createState() => _AdminScreenState();
}

class _AdminScreenState extends State<AdminScreen>
    with SingleTickerProviderStateMixin {
  late final TabController _tabController;
  int _activeTab = 0;

  final List<_AdminUser> _usuarios = [
    const _AdminUser(
      id: 'u-01',
      nombre: 'Laura',
      apellido: 'Gómez',
      email: 'laura@recolecta.com',
      telefono: '+52 461 987 1234',
    ),
    const _AdminUser(
      id: 'u-02',
      nombre: 'Miguel',
      apellido: 'Sánchez',
      email: 'miguel@recolecta.com',
      telefono: '+52 461 123 7890',
    ),
  ];

  final List<_AdminRoute> _rutas = [
    const _AdminRoute(id: 'RUTA-01', nombre: 'Ruta Norte', zona: 'Zona Norte'),
    const _AdminRoute(
      id: 'RUTA-02',
      nombre: 'Ruta Sur',
      zona: 'Zona Sur',
      activa: false,
    ),
  ];

  final List<_AdminTruck> _camiones = [
    const _AdminTruck(
      id: 't-01',
      placas: 'GTO-101',
      modelo: 'Volvo FH',
      conductor: 'Javier Pérez',
      status: TruckStatus.enRuta,
      rutaId: 'RUTA-01',
    ),
    const _AdminTruck(
      id: 't-02',
      placas: 'GTO-103',
      modelo: 'Mercedes 1830',
      conductor: 'Ana Díaz',
      status: TruckStatus.disponible,
      rutaId: 'RUTA-02',
    ),
  ];

  @override
  void initState() {
    super.initState();
    _tabController = TabController(length: 3, vsync: this)
      ..addListener(() {
        if (!_tabController.indexIsChanging) {
          setState(() => _activeTab = _tabController.index);
        }
      });
  }

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: AppTheme.background,
      appBar: AppBar(
        title: const Text('Panel de administración'),
        bottom: TabBar(
          controller: _tabController,
          indicatorColor: Colors.white,
          labelColor: Colors.white,
          unselectedLabelColor: Colors.white70,
          tabs: const [
            Tab(text: 'Usuarios'),
            Tab(text: 'Rutas'),
            Tab(text: 'Camiones'),
          ],
        ),
      ),
      body: TabBarView(
        controller: _tabController,
        children: [_buildUsersTab(), _buildRoutesTab(), _buildTrucksTab()],
      ),
      floatingActionButton: FloatingActionButton.extended(
        onPressed: () {
          if (_activeTab == 0)
            _showUserForm();
          else if (_activeTab == 1)
            _showRouteForm();
          else
            _showTruckForm();
        },
        backgroundColor: AppTheme.primary,
        label: Text(
          _activeTab == 0
              ? 'Nuevo usuario'
              : _activeTab == 1
              ? 'Nueva ruta'
              : 'Nuevo camión',
        ),
        icon: const Icon(Icons.add),
      ),
    );
  }

  // ── Tab usuarios ────────────────────────────────────────────────────────────
  Widget _buildUsersTab() {
    if (_usuarios.isEmpty) return _emptyState('No hay usuarios registrados.');
    return ListView.separated(
      padding: const EdgeInsets.all(16),
      itemCount: _usuarios.length,
      separatorBuilder: (_, i) => const SizedBox(height: 12),
      itemBuilder: (context, i) {
        final u = _usuarios[i];
        return AppCard(
          child: Row(
            children: [
              CircleAvatar(
                backgroundColor: AppTheme.primaryLight,
                foregroundColor: AppTheme.primary,
                child: Text(u.iniciales),
              ),
              const SizedBox(width: 14),
              Expanded(
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Text(
                      u.nombreCompleto,
                      style: const TextStyle(
                        fontSize: 15,
                        fontWeight: FontWeight.w600,
                      ),
                    ),
                    const SizedBox(height: 4),
                    Text(
                      u.email,
                      style: const TextStyle(
                        fontSize: 13,
                        color: AppTheme.textSecondary,
                      ),
                    ),
                    Text(u.telefono, style: const TextStyle(fontSize: 13)),
                  ],
                ),
              ),
              IconButton(
                icon: const Icon(Icons.edit_outlined, color: AppTheme.primary),
                onPressed: () => _showUserForm(user: u),
              ),
              IconButton(
                icon: const Icon(Icons.delete_outline, color: AppTheme.danger),
                onPressed: () => _confirmDelete(
                  'usuario',
                  () => setState(
                    () => _usuarios.removeWhere((x) => x.id == u.id),
                  ),
                ),
              ),
            ],
          ),
        );
      },
    );
  }

  // ── Tab rutas ───────────────────────────────────────────────────────────────
  Widget _buildRoutesTab() {
    if (_rutas.isEmpty) return _emptyState('No hay rutas registradas.');
    return ListView.separated(
      padding: const EdgeInsets.all(16),
      itemCount: _rutas.length,
      separatorBuilder: (_, i) => const SizedBox(height: 12),
      itemBuilder: (context, i) {
        final r = _rutas[i];
        return AppCard(
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Row(
                children: [
                  Expanded(
                    child: Text(
                      r.nombre,
                      style: const TextStyle(
                        fontSize: 15,
                        fontWeight: FontWeight.w600,
                      ),
                    ),
                  ),
                  r.activa
                      ? AppStatusBadge.green('Activa')
                      : AppStatusBadge.gray('Inactiva'),
                ],
              ),
              const SizedBox(height: 6),
              Text(
                r.zona,
                style: const TextStyle(
                  fontSize: 13,
                  color: AppTheme.textSecondary,
                ),
              ),
              const SizedBox(height: 12),
              Row(
                mainAxisAlignment: MainAxisAlignment.end,
                children: [
                  TextButton.icon(
                    onPressed: () => _showRouteForm(route: r),
                    icon: const Icon(Icons.edit_outlined, size: 18),
                    label: const Text('Editar'),
                  ),
                  const SizedBox(width: 8),
                  TextButton.icon(
                    onPressed: () => _confirmDelete(
                      'ruta',
                      () => setState(
                        () => _rutas.removeWhere((x) => x.id == r.id),
                      ),
                    ),
                    icon: const Icon(Icons.delete_outline, size: 18),
                    label: const Text('Eliminar'),
                    style: TextButton.styleFrom(
                      foregroundColor: AppTheme.danger,
                    ),
                  ),
                ],
              ),
            ],
          ),
        );
      },
    );
  }

  // ── Tab camiones ────────────────────────────────────────────────────────────
  Widget _buildTrucksTab() {
    if (_camiones.isEmpty) return _emptyState('No hay camiones registrados.');
    return ListView.separated(
      padding: const EdgeInsets.all(16),
      itemCount: _camiones.length,
      separatorBuilder: (_, i) => const SizedBox(height: 12),
      itemBuilder: (context, i) {
        final t = _camiones[i];
        final ruta = _rutas.firstWhere(
          (r) => r.id == t.rutaId,
          orElse: () => const _AdminRoute(id: '', nombre: 'Sin ruta', zona: ''),
        );
        return AppCard(
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Row(
                children: [
                  Expanded(
                    child: Text(
                      t.placas,
                      style: const TextStyle(
                        fontSize: 15,
                        fontWeight: FontWeight.w600,
                      ),
                    ),
                  ),
                  t.status.badge,
                ],
              ),
              const SizedBox(height: 6),
              Text(
                '${t.modelo} · ${t.conductor}',
                style: const TextStyle(fontSize: 13),
              ),
              Text(
                'Ruta: ${ruta.nombre}',
                style: const TextStyle(
                  fontSize: 13,
                  color: AppTheme.textSecondary,
                ),
              ),
              const SizedBox(height: 12),
              Row(
                mainAxisAlignment: MainAxisAlignment.end,
                children: [
                  TextButton.icon(
                    onPressed: () => _showTruckForm(truck: t),
                    icon: const Icon(Icons.edit_outlined, size: 18),
                    label: const Text('Editar'),
                  ),
                  const SizedBox(width: 8),
                  TextButton.icon(
                    onPressed: () => _confirmDelete(
                      'camión',
                      () => setState(
                        () => _camiones.removeWhere((x) => x.id == t.id),
                      ),
                    ),
                    icon: const Icon(Icons.delete_outline, size: 18),
                    label: const Text('Eliminar'),
                    style: TextButton.styleFrom(
                      foregroundColor: AppTheme.danger,
                    ),
                  ),
                ],
              ),
            ],
          ),
        );
      },
    );
  }

  Widget _emptyState(String msg) => Center(
    child: Padding(
      padding: const EdgeInsets.all(24),
      child: Text(
        msg,
        textAlign: TextAlign.center,
        style: const TextStyle(fontSize: 15, color: AppTheme.textSecondary),
      ),
    ),
  );

  // ── Confirmación de borrado ─────────────────────────────────────────────────
  void _confirmDelete(String tipo, VoidCallback onConfirm) {
    showDialog(
      context: context,
      builder: (ctx) => AlertDialog(
        backgroundColor: AppTheme.surface,
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(AppTheme.radiusLg),
        ),
        title: Text('Eliminar $tipo'),
        content: Text('¿Deseas eliminar este $tipo?'),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(ctx),
            style: TextButton.styleFrom(
              foregroundColor: AppTheme.textSecondary,
            ),
            child: const Text('Cancelar'),
          ),
          TextButton(
            onPressed: () {
              onConfirm();
              Navigator.pop(ctx);
            },
            style: TextButton.styleFrom(foregroundColor: AppTheme.danger),
            child: const Text('Eliminar'),
          ),
        ],
      ),
    );
  }

  // ── Formulario usuario ──────────────────────────────────────────────────────
  void _showUserForm({_AdminUser? user}) {
    final nombreCtrl = TextEditingController(text: user?.nombre);
    final apellidoCtrl = TextEditingController(text: user?.apellido);
    final emailCtrl = TextEditingController(text: user?.email);
    final telefonoCtrl = TextEditingController(text: user?.telefono);
    showDialog(
      context: context,
      builder: (ctx) => AlertDialog(
        backgroundColor: AppTheme.surface,
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(AppTheme.radiusLg),
        ),
        title: Text(user == null ? 'Nuevo usuario' : 'Editar usuario'),
        content: SingleChildScrollView(
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              TextField(
                controller: nombreCtrl,
                decoration: const InputDecoration(labelText: 'Nombre'),
              ),
              TextField(
                controller: apellidoCtrl,
                decoration: const InputDecoration(labelText: 'Apellido'),
              ),
              TextField(
                controller: emailCtrl,
                decoration: const InputDecoration(labelText: 'Correo'),
                keyboardType: TextInputType.emailAddress,
              ),
              TextField(
                controller: telefonoCtrl,
                decoration: const InputDecoration(labelText: 'Teléfono'),
                keyboardType: TextInputType.phone,
              ),
            ],
          ),
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(ctx),
            style: TextButton.styleFrom(
              foregroundColor: AppTheme.textSecondary,
            ),
            child: const Text('Cancelar'),
          ),
          TextButton(
            onPressed: () {
              final nuevo = _AdminUser(
                id: user?.id ?? 'u-${DateTime.now().millisecondsSinceEpoch}',
                nombre: nombreCtrl.text.trim(),
                apellido: apellidoCtrl.text.trim(),
                email: emailCtrl.text.trim(),
                telefono: telefonoCtrl.text.trim(),
              );
              setState(() {
                if (user == null) {
                  _usuarios.add(nuevo);
                } else {
                  final idx = _usuarios.indexWhere((x) => x.id == user.id);
                  if (idx >= 0) _usuarios[idx] = nuevo;
                }
              });
              Navigator.pop(ctx);
            },
            child: Text(user == null ? 'Crear' : 'Guardar'),
          ),
        ],
      ),
    );
  }

  // ── Formulario ruta ─────────────────────────────────────────────────────────
  void _showRouteForm({_AdminRoute? route}) {
    final nombreCtrl = TextEditingController(text: route?.nombre);
    final zonaCtrl = TextEditingController(text: route?.zona);
    bool activa = route?.activa ?? true;
    showDialog(
      context: context,
      builder: (ctx) => StatefulBuilder(
        builder: (ctx, setInner) => AlertDialog(
          backgroundColor: AppTheme.surface,
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(AppTheme.radiusLg),
          ),
          title: Text(route == null ? 'Nueva ruta' : 'Editar ruta'),
          content: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              TextField(
                controller: nombreCtrl,
                decoration: const InputDecoration(labelText: 'Nombre de ruta'),
              ),
              TextField(
                controller: zonaCtrl,
                decoration: const InputDecoration(labelText: 'Zona'),
              ),
              Row(
                children: [
                  const Expanded(child: Text('Ruta activa')),
                  Switch.adaptive(
                    value: activa,
                    onChanged: (v) => setInner(() => activa = v),
                  ),
                ],
              ),
            ],
          ),
          actions: [
            TextButton(
              onPressed: () => Navigator.pop(ctx),
              style: TextButton.styleFrom(
                foregroundColor: AppTheme.textSecondary,
              ),
              child: const Text('Cancelar'),
            ),
            TextButton(
              onPressed: () {
                final nueva = _AdminRoute(
                  id: route?.id ?? 'r-${DateTime.now().millisecondsSinceEpoch}',
                  nombre: nombreCtrl.text.trim(),
                  zona: zonaCtrl.text.trim(),
                  activa: activa,
                );
                setState(() {
                  if (route == null) {
                    _rutas.add(nueva);
                  } else {
                    final idx = _rutas.indexWhere((x) => x.id == route.id);
                    if (idx >= 0) _rutas[idx] = nueva;
                  }
                });
                Navigator.pop(ctx);
              },
              child: Text(route == null ? 'Crear' : 'Guardar'),
            ),
          ],
        ),
      ),
    );
  }

  // ── Formulario camión ───────────────────────────────────────────────────────
  void _showTruckForm({_AdminTruck? truck}) {
    final placasCtrl = TextEditingController(text: truck?.placas);
    final modeloCtrl = TextEditingController(text: truck?.modelo);
    final conductorCtrl = TextEditingController(text: truck?.conductor);
    TruckStatus status = truck?.status ?? TruckStatus.disponible;
    String selectedRuta =
        truck?.rutaId ?? (_rutas.isNotEmpty ? _rutas.first.id : '');
    showDialog(
      context: context,
      builder: (ctx) => StatefulBuilder(
        builder: (ctx, setInner) => AlertDialog(
          backgroundColor: AppTheme.surface,
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(AppTheme.radiusLg),
          ),
          title: Text(truck == null ? 'Nuevo camión' : 'Editar camión'),
          content: SingleChildScrollView(
            child: Column(
              mainAxisSize: MainAxisSize.min,
              children: [
                TextField(
                  controller: placasCtrl,
                  decoration: const InputDecoration(labelText: 'Placas'),
                ),
                TextField(
                  controller: modeloCtrl,
                  decoration: const InputDecoration(labelText: 'Modelo'),
                ),
                TextField(
                  controller: conductorCtrl,
                  decoration: const InputDecoration(labelText: 'Conductor'),
                ),
                const SizedBox(height: 12),
                DropdownButtonFormField<String>(
                  value: selectedRuta.isEmpty ? null : selectedRuta,
                  decoration: const InputDecoration(labelText: 'Ruta'),
                  items: _rutas
                      .map(
                        (r) => DropdownMenuItem(
                          value: r.id,
                          child: Text(r.nombre),
                        ),
                      )
                      .toList(),
                  onChanged: (v) {
                    if (v != null) setInner(() => selectedRuta = v);
                  },
                ),
                const SizedBox(height: 12),
                DropdownButtonFormField<TruckStatus>(
                  value: status,
                  decoration: const InputDecoration(labelText: 'Estatus'),
                  items: TruckStatus.values
                      .map(
                        (s) => DropdownMenuItem(value: s, child: Text(s.label)),
                      )
                      .toList(),
                  onChanged: (v) {
                    if (v != null) setInner(() => status = v);
                  },
                ),
              ],
            ),
          ),
          actions: [
            TextButton(
              onPressed: () => Navigator.pop(ctx),
              style: TextButton.styleFrom(
                foregroundColor: AppTheme.textSecondary,
              ),
              child: const Text('Cancelar'),
            ),
            TextButton(
              onPressed: () {
                final nuevo = _AdminTruck(
                  id: truck?.id ?? 't-${DateTime.now().millisecondsSinceEpoch}',
                  placas: placasCtrl.text.trim(),
                  modelo: modeloCtrl.text.trim(),
                  conductor: conductorCtrl.text.trim(),
                  status: status,
                  rutaId: selectedRuta,
                );
                setState(() {
                  if (truck == null) {
                    _camiones.add(nuevo);
                  } else {
                    final idx = _camiones.indexWhere((x) => x.id == truck.id);
                    if (idx >= 0) _camiones[idx] = nuevo;
                  }
                });
                Navigator.pop(ctx);
              },
              child: Text(truck == null ? 'Crear' : 'Guardar'),
            ),
          ],
        ),
      ),
    );
  }
}