geo/app/lib/shared/widgets/admin_background.dart

import 'package:flutter/material.dart';
import 'dart:math' as math;

/// Widget pour créer un fond dégradé avec des petits points blancs
/// Utilisé pour les pages d'administration
class AdminBackground extends StatelessWidget {
  final Widget child;

  const AdminBackground({
    super.key,
    required this.child,
  });

  @override
  Widget build(BuildContext context) {
    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
        child,
      ],
    );
  }
}

/// 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;
}