impact/lib/core/widgets/metric_info_button.dart

/// Bouton d'information (ⓘ) qui explique des métriques à l'utilisateur.
///
/// Affiche une petite icône cliquable ; au clic, une boîte de dialogue
/// détaille la signification de chaque statistique de la carte associée.
library;

import 'package:flutter/material.dart';

/// Explication d'une métrique : un libellé et sa description.
class MetricExplanation {
  final String label;
  final String description;

  const MetricExplanation(this.label, this.description);
}

class MetricInfoButton extends StatelessWidget {
  final String title;
  final List<MetricExplanation> explanations;

  const MetricInfoButton({
    super.key,
    required this.title,
    required this.explanations,
  });

  @override
  Widget build(BuildContext context) {
    return IconButton(
      icon: Icon(Icons.info_outline, size: 18, color: Colors.grey[500]),
      visualDensity: VisualDensity.compact,
      padding: EdgeInsets.zero,
      constraints: const BoxConstraints(),
      tooltip: 'À quoi ça correspond ?',
      onPressed: () => _showInfo(context),
    );
  }

  void _showInfo(BuildContext context) {
    showDialog<void>(
      context: context,
      builder: (context) => AlertDialog(
        title: Text(title),
        content: SingleChildScrollView(
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            mainAxisSize: MainAxisSize.min,
            children: [
              for (final e in explanations)
                Padding(
                  padding: const EdgeInsets.only(bottom: 14),
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      Text(
                        e.label,
                        style: const TextStyle(fontWeight: FontWeight.bold),
                      ),
                      const SizedBox(height: 2),
                      Text(e.description),
                    ],
                  ),
                ),
            ],
          ),
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.of(context).pop(),
            child: const Text('Compris'),
          ),
        ],
      ),
    );
  }
}