import 'package:dio/dio.dart';
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_incident.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 2:
        await _showUnitForm();
        break;
    }
  }

  Future<void> _handleSimulationTick() async {
    try {
      final events = await _service.simulationTick();
      if (events.isEmpty) {
        _snack('Tick enviado · sin eventos nuevos en esta posición');
      } else {
        final tipos = events
            .map((e) => e['event']?.toString() ?? '?')
            .toSet()
            .join(', ');
        _snack('Tick enviado · ${events.length} push FCM ($tipos)');
      }
    } catch (e) {
      _snack('No se pudo avanzar la simulación: $e', error: true);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: AppTheme.background,
      appBar: AppBar(
        title: const Text('Panel de administración'),
        actions: [
          IconButton(
            tooltip: 'Avanzar simulación (envía push FCM)',
            icon: const Icon(Icons.play_circle_fill_rounded),
            onPressed: _handleSimulationTick,
          ),
          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: 'Unidades'),
          ],
        ),
      ),
      body: TabBarView(
        controller: _tabController,
        children: const [_UsersTab(), _RoutesTab(), _TrucksTab()],
      ),
      floatingActionButton: _activeTab == 1
          ? null // Oculta el botón flotante en la pestaña de Rutas
          : FloatingActionButton.extended(
              onPressed: _handleAdd,
              backgroundColor: AppTheme.primary,
              icon: const Icon(Icons.add),
              label: Text(_activeTab == 0 ? 'Nuevo usuario' : 'Nueva unidad'),
            ),
    );
  }

  // ── 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 para Reasignar Ruta (Solo Vespertinas) ───────────────────────
  Future<void> _showReassignRoute(AdminRouteModel route) async {
    final units = ref
        .read(adminUnitsProvider)
        .maybeWhen(
          data: (u) => u.where((x) => x.status == 'active').toList(),
          orElse: () => <AdminUnitModel>[],
        );

    int? selectedUnitId;
    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: const Text('Reasignar Unidad'),
              content: Form(
                key: formKey,
                child: Column(
                  mainAxisSize: MainAxisSize.min,
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Text(
                      'Ruta: ${route.displayName}',
                      style: const TextStyle(fontWeight: FontWeight.w600),
                    ),
                    const SizedBox(height: 8),
                    const Text(
                      'Selecciona una unidad activa para cubrir este turno vespertino:',
                      style: TextStyle(
                        fontSize: 13,
                        color: AppTheme.textSecondary,
                      ),
                    ),
                    const SizedBox(height: 16),
                    DropdownButtonFormField<int>(
                      decoration: InputDecoration(
                        labelText: 'Nueva Unidad',
                        border: OutlineInputBorder(
                          borderRadius: BorderRadius.circular(
                            AppTheme.radiusMd,
                          ),
                        ),
                      ),
                      validator: (v) =>
                          v == null ? 'Selecciona una unidad' : null,
                      items: units.map((u) {
                        return DropdownMenuItem(
                          value: u.id,
                          child: Text('${u.displayPlate} (#${u.id})'),
                        );
                      }).toList(),
                      onChanged: (v) =>
                          setStateDialog(() => selectedUnitId = v),
                    ),
                  ],
                ),
              ),
              actions: [
                TextButton(
                  onPressed: () => Navigator.pop(ctx, false),
                  child: const Text('Cancelar'),
                ),
                ElevatedButton(
                  onPressed: () async {
                    if (!formKey.currentState!.validate()) return;
                    try {
                      await _service.updateRoute(
                        route.id,
                        truckId: selectedUnitId,
                        status: 'reasignada',
                      );
                      if (ctx.mounted) Navigator.pop(ctx, true);
                    } catch (e) {
                      _snack('Error: ${_errMsg(e)}', error: true);
                    }
                  },
                  child: const Text('Confirmar'),
                ),
              ],
            );
          },
        );
      },
    );

    if (saved == true) {
      ref.invalidate(adminRoutesProvider);
      _snack('Ruta reasignada exitosamente');
    }
  }

  // ── Formulario unidad ───────────────────────────────────────────────────────
  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 unidad' : 'Nueva unidad'),
              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 ? 'Unidad actualizada' : 'Unidad creada');
    }
  }

  // ── 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(
                    'Unidad: ${unit?.displayPlate ?? (r.truckId == null ? 'Sin asignar' : '#${r.truckId}')}',
                    style: const TextStyle(
                      fontSize: 13,
                      color: AppTheme.textSecondary,
                    ),
                  ),
                  Text(
                    'Posición actual: ${r.currentPositionId}/8',
                    style: const TextStyle(
                      fontSize: 12,
                      color: AppTheme.textSecondary,
                    ),
                  ),
                  if (unit != null &&
                      (unit.status == 'inactive' ||
                          unit.status == 'maintenance') &&
                      r.turno?.toLowerCase() == 'vespertino') ...[
                    const SizedBox(height: 12),
                    Align(
                      alignment: Alignment.centerRight,
                      child: FilledButton.icon(
                        onPressed: () {
                          final state = context
                              .findAncestorStateOfType<_AdminScreenState>();
                          state?._showReassignRoute(r);
                        },
                        icon: const Icon(Icons.swap_horiz, size: 18),
                        label: const Text('Reasignar unidad'),
                        style: FilledButton.styleFrom(
                          backgroundColor: AppTheme.primary,
                          visualDensity: VisualDensity.compact,
                        ),
                      ),
                    ),
                  ],
                ],
              ),
            );
          },
        );
      },
    );
  }

  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');
    }
  }
}

// ── Tab Unidades ──────────────────────────────────────────────────────────────

/// Llenado estático de conductores por unidad (placeholder mientras no haya
/// registros reales en la tabla `drivers`). Se usa como fallback en la
/// UnitCard cuando `adminDriversProvider` no devuelve un driver asignado.
const Map<int, String> _staticDriversByUnit = {
  101: 'Juan Pérez Hernández',
  103: 'Miguel Ángel Reyes',
  104: 'Carlos Eduardo Vázquez',
  105: 'Roberto Sánchez Luna',
  112: 'José Antonio Ramírez',
  113: 'Luis Fernando Torres',
};

/// Extrae el mensaje útil de un error de red, priorizando el `detail`
/// devuelto por FastAPI cuando hay un 500/400.
String _formatIncidentError(Object e) {
  if (e is DioException) {
    final status = e.response?.statusCode;
    final data = e.response?.data;
    String? detail;
    if (data is Map && data['detail'] is String) {
      detail = data['detail'] as String;
    } else if (data is String && data.isNotEmpty) {
      detail = data;
    }
    if (detail != null) {
      return status != null ? '[$status] $detail' : detail;
    }
    return 'Error de red: ${e.message ?? e.type.name}';
  }
  return e.toString();
}

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 unidades registradas.');
        }
        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: [
                  // ── Encabezado: placa + badge estado ─────────────────
                  Row(
                    children: [
                      Expanded(
                        child: Text(
                          t.displayPlate,
                          style: const TextStyle(
                            fontSize: 15,
                            fontWeight: FontWeight.w600,
                          ),
                        ),
                      ),
                      _unitStatusBadge(t.status),
                    ],
                  ),
                  const SizedBox(height: 6),
                  // ── Detalles ──────────────────────────────────────────
                  Text(
                    'ID: #${t.id}',
                    style: const TextStyle(
                      fontSize: 12,
                      color: AppTheme.textSecondary,
                    ),
                  ),
                  Text(
                    'Conductor: ${assignedDriver?.displayName ?? _staticDriversByUnit[t.id] ?? '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),
                  // ── Botones de acción ─────────────────────────────────
                  Row(
                    mainAxisAlignment: MainAxisAlignment.end,
                    children: [
                      // Ver incidencias
                      TextButton.icon(
                        onPressed: () => _showIncidentsSheet(context, ref, t),
                        icon: const Icon(Icons.warning_amber_rounded, size: 18),
                        label: const Text('Incidencias'),
                        style: TextButton.styleFrom(
                          foregroundColor: Colors.orange.shade700,
                        ),
                      ),
                      const SizedBox(width: 4),
                      // Editar
                      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: 4),
                      // Eliminar
                      TextButton.icon(
                        onPressed: () => _confirmAndDelete(
                          context,
                          tipo: 'unidad',
                          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,
                        ),
                      ),
                    ],
                  ),
                ],
              ),
            );
          },
        );
      },
    );
  }

  // ── Abre el bottom sheet de incidencias ───────────────────────────────────
  void _showIncidentsSheet(
    BuildContext context,
    WidgetRef ref,
    AdminUnitModel unit,
  ) {
    showModalBottomSheet(
      context: context,
      isScrollControlled: true,
      backgroundColor: AppTheme.surface,
      shape: const RoundedRectangleBorder(
        borderRadius: BorderRadius.vertical(top: Radius.circular(20)),
      ),
      builder: (_) => _IncidentsSheet(unit: unit),
    );
  }

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

// ── Bottom sheet de incidencias ───────────────────────────────────────────────
class _IncidentsSheet extends ConsumerStatefulWidget {
  const _IncidentsSheet({required this.unit});
  final AdminUnitModel unit;

  @override
  ConsumerState<_IncidentsSheet> createState() => _IncidentsSheetState();
}

class _IncidentsSheetState extends ConsumerState<_IncidentsSheet> {
  @override
  Widget build(BuildContext context) {
    final async = ref.watch(adminIncidentsByUnitProvider(widget.unit.id));

    return DraggableScrollableSheet(
      expand: false,
      initialChildSize: 0.6,
      maxChildSize: 0.92,
      builder: (_, controller) => Column(
        children: [
          // ── Handle ─────────────────────────────────────────────────
          const SizedBox(height: 12),
          Container(
            width: 40,
            height: 4,
            decoration: BoxDecoration(
              color: Colors.grey.shade300,
              borderRadius: BorderRadius.circular(2),
            ),
          ),
          const SizedBox(height: 12),
          // ── Header ─────────────────────────────────────────────────
          Padding(
            padding: const EdgeInsets.symmetric(horizontal: 20),
            child: Row(
              children: [
                const Icon(
                  Icons.warning_amber_rounded,
                  color: Colors.orange,
                  size: 22,
                ),
                const SizedBox(width: 8),
                Expanded(
                  child: Text(
                    'Incidencias — ${widget.unit.displayPlate}',
                    style: const TextStyle(
                      fontSize: 16,
                      fontWeight: FontWeight.w700,
                    ),
                  ),
                ),
                IconButton(
                  icon: const Icon(
                    Icons.add_circle_outline,
                    color: AppTheme.primary,
                  ),
                  tooltip: 'Nueva incidencia',
                  onPressed: () => _showCreateIncidentDialog(context),
                ),
              ],
            ),
          ),
          const Divider(height: 1),
          // ── Lista ───────────────────────────────────────────────────
          Expanded(
            child: async.when(
              loading: () => const Center(child: CircularProgressIndicator()),
              error: (e, _) => Center(
                child: Padding(
                  padding: const EdgeInsets.all(16),
                  child: Column(
                    mainAxisSize: MainAxisSize.min,
                    children: [
                      const Icon(
                        Icons.error_outline,
                        color: AppTheme.danger,
                        size: 40,
                      ),
                      const SizedBox(height: 8),
                      Text(
                        _formatIncidentError(e),
                        textAlign: TextAlign.center,
                        style: const TextStyle(
                          fontSize: 13,
                          color: AppTheme.textSecondary,
                        ),
                      ),
                      const SizedBox(height: 12),
                      ElevatedButton(
                        onPressed: () => ref.invalidate(
                          adminIncidentsByUnitProvider(widget.unit.id),
                        ),
                        child: const Text('Reintentar'),
                      ),
                    ],
                  ),
                ),
              ),
              data: (incidents) {
                if (incidents.isEmpty) {
                  return const Center(
                    child: Padding(
                      padding: EdgeInsets.all(24),
                      child: Text(
                        'Sin incidencias registradas.',
                        style: TextStyle(color: AppTheme.textSecondary),
                      ),
                    ),
                  );
                }
                return ListView.separated(
                  controller: controller,
                  padding: const EdgeInsets.fromLTRB(16, 12, 16, 32),
                  itemCount: incidents.length,
                  separatorBuilder: (_, __) => const SizedBox(height: 10),
                  itemBuilder: (_, i) => _IncidentCard(incident: incidents[i]),
                );
              },
            ),
          ),
        ],
      ),
    );
  }

  Future<void> _showCreateIncidentDialog(BuildContext context) async {
    String type = 'otro';
    final desc = TextEditingController();
    final formKey = GlobalKey<FormState>();

    final saved = await showDialog<bool>(
      context: context,
      builder: (ctx) => StatefulBuilder(
        builder: (ctx, setStateDialog) => AlertDialog(
          backgroundColor: AppTheme.surface,
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(AppTheme.radiusLg),
          ),
          title: const Text('Nueva incidencia'),
          content: Form(
            key: formKey,
            child: Column(
              mainAxisSize: MainAxisSize.min,
              children: [
                DropdownButtonFormField<String>(
                  initialValue: type,
                  decoration: InputDecoration(
                    labelText: 'Categoría',
                    border: OutlineInputBorder(
                      borderRadius: BorderRadius.circular(AppTheme.radiusMd),
                    ),
                  ),
                  items: const [
                    DropdownMenuItem(
                      value: 'derrame',
                      child: Text('💧 Derrame'),
                    ),
                    DropdownMenuItem(
                      value: 'dano_propiedad',
                      child: Text('💥 Daño a propiedad'),
                    ),
                    DropdownMenuItem(
                      value: 'conducta',
                      child: Text('😠 Conducta'),
                    ),
                    DropdownMenuItem(
                      value: 'no_recoleccion',
                      child: Text('🗑 No recolección'),
                    ),
                    DropdownMenuItem(value: 'otro', child: Text('📋 Otro')),
                  ],
                  onChanged: (v) {
                    if (v != null) setStateDialog(() => type = v);
                  },
                ),
                const SizedBox(height: 10),
                TextFormField(
                  controller: desc,
                  maxLines: 3,
                  decoration: InputDecoration(
                    labelText: 'Descripción',
                    helperText: 'Mínimo 3 caracteres',
                    border: OutlineInputBorder(
                      borderRadius: BorderRadius.circular(AppTheme.radiusMd),
                    ),
                  ),
                  validator: (v) {
                    final t = (v ?? '').trim();
                    if (t.length < 3) return 'Describe brevemente lo ocurrido';
                    return null;
                  },
                ),
              ],
            ),
          ),
          actions: [
            TextButton(
              onPressed: () => Navigator.pop(ctx, false),
              child: const Text('Cancelar'),
            ),
            ElevatedButton(
              onPressed: () async {
                if (!(formKey.currentState?.validate() ?? false)) return;
                try {
                  await ref
                      .read(adminServiceProvider)
                      .createIncident(
                        unitId: widget.unit.id,
                        type: type,
                        description: desc.text.trim(),
                      );
                  if (ctx.mounted) Navigator.pop(ctx, true);
                } catch (e) {
                  if (ctx.mounted) {
                    ScaffoldMessenger.of(ctx).showSnackBar(
                      SnackBar(
                        content: Text('Error: $e'),
                        backgroundColor: AppTheme.danger,
                      ),
                    );
                  }
                }
              },
              child: const Text('Guardar'),
            ),
          ],
        ),
      ),
    );

    if (saved == true) {
      ref.invalidate(adminIncidentsByUnitProvider(widget.unit.id));
    }
  }
}

// ── Tarjeta individual de incidencia ──────────────────────────────────────────
class _IncidentCard extends StatelessWidget {
  const _IncidentCard({required this.incident});
  final AdminIncidentModel incident;

  @override
  Widget build(BuildContext context) {
    return AppCard(
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          _typeIcon(incident.type),
          const SizedBox(width: 12),
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                // ── Tipo + fecha ──────────────────────────────────────
                Row(
                  children: [
                    _typeBadge(incident.type),
                    const Spacer(),
                    Text(
                      _formatDate(incident.createdAt),
                      style: const TextStyle(
                        fontSize: 11,
                        color: AppTheme.textSecondary,
                      ),
                    ),
                  ],
                ),
                // ── Conductor ─────────────────────────────────────────
                if ((incident.driverName ??
                        _staticDriversByUnit[incident.unitId]) !=
                    null) ...[
                  const SizedBox(height: 6),
                  Row(
                    children: [
                      const Icon(
                        Icons.person_outline,
                        size: 14,
                        color: AppTheme.textSecondary,
                      ),
                      const SizedBox(width: 4),
                      Expanded(
                        child: Text(
                          incident.driverName ??
                              _staticDriversByUnit[incident.unitId]!,
                          style: const TextStyle(
                            fontSize: 13,
                            fontWeight: FontWeight.w500,
                          ),
                          overflow: TextOverflow.ellipsis,
                        ),
                      ),
                    ],
                  ),
                ],
                // ── Ruta ─────────────────────────────────────────────
                if (incident.routeId != null) ...[
                  const SizedBox(height: 2),
                  Text(
                    'Ruta: ${incident.routeId}',
                    style: const TextStyle(
                      fontSize: 12,
                      color: AppTheme.textSecondary,
                    ),
                  ),
                ],
                // ── Descripción ───────────────────────────────────────
                if (incident.description != null &&
                    incident.description!.isNotEmpty) ...[
                  const SizedBox(height: 6),
                  Text(
                    incident.description!,
                    style: const TextStyle(fontSize: 13),
                  ),
                ],
              ],
            ),
          ),
        ],
      ),
    );
  }

  Widget _typeIcon(String type) {
    IconData icon;
    Color color;
    switch (type) {
      case 'derrame':
        icon = Icons.water_drop_outlined;
        color = Colors.blue;
        break;
      case 'dano_propiedad':
        icon = Icons.report_gmailerrorred_outlined;
        color = AppTheme.danger;
        break;
      case 'conducta':
        icon = Icons.sentiment_very_dissatisfied_outlined;
        color = Colors.orange;
        break;
      case 'no_recoleccion':
        icon = Icons.delete_forever_outlined;
        color = Colors.deepOrange;
        break;
      default:
        icon = Icons.info_outline;
        color = AppTheme.textSecondary;
    }
    return Icon(icon, color: color, size: 22);
  }

  Widget _typeBadge(String type) {
    switch (type) {
      case 'derrame':
        return AppStatusBadge.amber('Derrame');
      case 'dano_propiedad':
        return AppStatusBadge.danger('Daño');
      case 'conducta':
        return AppStatusBadge.amber('Conducta');
      case 'no_recoleccion':
        return AppStatusBadge.danger('No recolección');
      default:
        return AppStatusBadge.gray('Otro');
    }
  }

  String _formatDate(DateTime dt) {
    final d = dt.toLocal();
    final day = d.day.toString().padLeft(2, '0');
    final month = d.month.toString().padLeft(2, '0');
    final hour = d.hour.toString().padLeft(2, '0');
    final minute = d.minute.toString().padLeft(2, '0');
    return '$day/$month/${d.year} $hour:$minute';
  }
}

// ── 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'),
        ),
      ],
    ),
  );
}

// EOF