geo/app/lib/presentation/widgets/admin_scaffold.dart

import 'package:flutter/material.dart';
import 'package:go_router/go_router.dart';
import 'package:geosector_app/presentation/widgets/dashboard_layout.dart';
import 'package:geosector_app/presentation/widgets/badged_navigation_destination.dart';
import 'package:geosector_app/app.dart';
import 'dart:math' as math;

/// Class pour dessiner les petits points blancs sur le fond
class DotsPainter extends CustomPainter {
  @override
  void paint(Canvas canvas, Size size) {
    final paint = Paint()
      ..color = Colors.white.withValues(alpha: 0.5)
      ..style = PaintingStyle.fill;

    final random = math.Random(42); // Seed fixe pour consistance
    final numberOfDots = (size.width * size.height) ~/ 1500;

    for (int i = 0; i < numberOfDots; i++) {
      final x = random.nextDouble() * size.width;
      final y = random.nextDouble() * size.height;
      final radius = 1.0 + random.nextDouble() * 2.0;
      canvas.drawCircle(Offset(x, y), radius, paint);
    }
  }

  @override
  bool shouldRepaint(covariant CustomPainter oldDelegate) => false;
}

/// Scaffold partagé pour toutes les pages d'administration
/// Fournit le fond dégradé et la navigation commune
class AdminScaffold extends StatelessWidget {
  /// Le contenu de la page
  final Widget body;

  /// L'index de navigation sélectionné
  final int selectedIndex;

  /// Le titre de la page
  final String pageTitle;

  /// Callback optionnel pour gérer la navigation personnalisée
  final Function(int)? onDestinationSelected;

  const AdminScaffold({
    super.key,
    required this.body,
    required this.selectedIndex,
    required this.pageTitle,
    this.onDestinationSelected,
  });

  @override
  Widget build(BuildContext context) {
    final currentUser = userRepository.getCurrentUser();
    final size = MediaQuery.of(context).size;
    final isMobile = size.width <= 900;

    return Stack(
      children: [
        // Fond dégradé avec petits points blancs
        Container(
          decoration: BoxDecoration(
            gradient: LinearGradient(
              begin: Alignment.topCenter,
              end: Alignment.bottomCenter,
              colors: [Colors.white, Colors.red.shade300],
            ),
          ),
          child: CustomPaint(
            painter: DotsPainter(),
            child: const SizedBox(width: double.infinity, height: double.infinity),
          ),
        ),

        // Contenu de la page avec navigation
        DashboardLayout(
          key: ValueKey('dashboard_layout_$selectedIndex'),
          title: 'Tableau de bord Administration',
          selectedIndex: selectedIndex,
          onDestinationSelected: onDestinationSelected ?? (index) {
            // Navigation par défaut si pas de callback personnalisé
            AdminNavigationHelper.navigateToIndex(context, index);
          },
          destinations: AdminNavigationHelper.getDestinations(
            currentUser: currentUser,
            isMobile: isMobile,
          ),
          isAdmin: true,
          body: body,
        ),
      ],
    );
  }
}

/// Helper pour centraliser la logique de navigation admin
class AdminNavigationHelper {
  /// Obtenir la liste des destinations de navigation selon le rôle et le device
  static List<NavigationDestination> getDestinations({
    required dynamic currentUser,
    required bool isMobile,
  }) {
    final destinations = <NavigationDestination>[
      // Pages de base toujours visibles
      const NavigationDestination(
        icon: Icon(Icons.dashboard_outlined),
        selectedIcon: Icon(Icons.dashboard),
        label: 'Tableau de bord',
      ),
      const NavigationDestination(
        icon: Icon(Icons.bar_chart_outlined),
        selectedIcon: Icon(Icons.bar_chart),
        label: 'Statistiques',
      ),
      const NavigationDestination(
        icon: Icon(Icons.history_outlined),
        selectedIcon: Icon(Icons.history),
        label: 'Historique',
      ),
      createBadgedNavigationDestination(
        icon: const Icon(Icons.chat_outlined),
        selectedIcon: const Icon(Icons.chat),
        label: 'Messages',
        showBadge: true,
      ),
      const NavigationDestination(
        icon: Icon(Icons.map_outlined),
        selectedIcon: Icon(Icons.map),
        label: 'Carte',
      ),
    ];

    // Ajouter les pages admin (role 2) seulement sur desktop
    if (currentUser?.role == 2 && !isMobile) {
      destinations.addAll([
        const NavigationDestination(
          icon: Icon(Icons.business_outlined),
          selectedIcon: Icon(Icons.business),
          label: 'Amicale & membres',
        ),
        const NavigationDestination(
          icon: Icon(Icons.calendar_today_outlined),
          selectedIcon: Icon(Icons.calendar_today),
          label: 'Opérations',
        ),
      ]);
    }

    return destinations;
  }

  /// Naviguer vers une page selon l'index
  static void navigateToIndex(BuildContext context, int index) {
    switch (index) {
      case 0:
        context.go('/admin');
        break;
      case 1:
        context.go('/admin/statistics');
        break;
      case 2:
        context.go('/admin/history');
        break;
      case 3:
        context.go('/admin/messages');
        break;
      case 4:
        context.go('/admin/map');
        break;
      case 5:
        context.go('/admin/amicale');
        break;
      case 6:
        context.go('/admin/operations');
        break;
      default:
        context.go('/admin');
    }
  }

  /// Obtenir l'index selon la route actuelle
  static int getIndexFromRoute(String route) {
    if (route.contains('/statistics')) return 1;
    if (route.contains('/history')) return 2;
    if (route.contains('/messages')) return 3;
    if (route.contains('/map')) return 4;
    if (route.contains('/amicale')) return 5;
    if (route.contains('/operations')) return 6;
    return 0; // Dashboard par défaut
  }

  /// Obtenir le nom de la page selon l'index
  static String getPageNameFromIndex(int index) {
    switch (index) {
      case 0: return 'dashboard';
      case 1: return 'statistics';
      case 2: return 'history';
      case 3: return 'messages';
      case 4: return 'map';
      case 5: return 'amicale';
      case 6: return 'operations';
      default: return 'dashboard';
    }
  }
}