import 'package:flutter/material.dart';
import 'package:flutter/foundation.dart' show defaultTargetPlatform, TargetPlatform, kIsWeb;
import 'package:package_info_plus/package_info_plus.dart';
import 'package:share_plus/share_plus.dart';
import 'package:url_launcher/url_launcher.dart';
import '../../../../shared/design_system/unionflow_design_system.dart';
import '../../../../shared/widgets/core_card.dart';
import '../../../../shared/widgets/info_badge.dart';


/// Page À propos - UnionFlow Mobile
/// 
/// Page d'informations sur l'application, version, équipe de développement,
/// liens utiles et fonctionnalités de support.
class AboutPage extends StatefulWidget {
  const AboutPage({super.key});

  @override
  State<AboutPage> createState() => _AboutPageState();
}

class _AboutPageState extends State<AboutPage> {
  PackageInfo? _packageInfo;

  @override
  void initState() {
    super.initState();
    _loadPackageInfo();
  }

  Future<void> _loadPackageInfo() async {
    final info = await PackageInfo.fromPlatform();
    setState(() {
      _packageInfo = info;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Theme.of(context).scaffoldBackgroundColor,
      appBar: UFAppBar(
        title: 'À PROPOS',
        actions: [
          IconButton(
            icon: const Icon(Icons.share_outlined, size: 20),
            onPressed: _shareApp,
          ),
        ],
      ),
      body: SingleChildScrollView(
        padding: const EdgeInsets.all(12),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            // Header harmonisé
            _buildHeader(),
            const SizedBox(height: 8),

            // Informations de l'application
            _buildAppInfoSection(),
            const SizedBox(height: 8),

            // Équipe de développement
            _buildTeamSection(),
            const SizedBox(height: 8),

            // Fonctionnalités
            _buildFeaturesSection(),
            const SizedBox(height: 8),

            // Liens utiles
            _buildLinksSection(),
            const SizedBox(height: 8),

            // Support et contact
            _buildSupportSection(),
            const SizedBox(height: 80),
          ],
        ),
      ),
    );
  }

  /// Header épuré
  Widget _buildHeader() {
    return Center(
      child: Column(
        children: [
          Container(
            padding: const EdgeInsets.all(10),
            decoration: BoxDecoration(
              color: AppColors.primaryGreen.withOpacity(0.1),
              borderRadius: BorderRadius.circular(10),
            ),
            child: const Icon(
              Icons.account_balance,
              color: AppColors.primaryGreen,
              size: 32,
            ),
          ),
          const SizedBox(height: 8),
          Text(
            'UNIONFLOW MOBILE',
            style: AppTypography.headerSmall.copyWith(fontWeight: FontWeight.bold, letterSpacing: 1.2),
          ),
          Text(
            'Gestion d\'associations et syndicats',
            style: AppTypography.subtitleSmall,
          ),
          const SizedBox(height: 8),
          if (_packageInfo != null)
            InfoBadge(
              text: 'VERSION ${_packageInfo!.version}',
              backgroundColor: AppColors.lightSurface,
              textColor: AppColors.textSecondaryLight,
            ),
        ],
      ),
    );
  }

  /// Section informations de l'application
  Widget _buildAppInfoSection() {
    return CoreCard(
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            'INFORMATIONS',
            style: AppTypography.subtitleSmall.copyWith(fontWeight: FontWeight.bold, letterSpacing: 1.1),
          ),
          const SizedBox(height: 8),
          _buildInfoRow('Construction', _packageInfo?.buildNumber ?? '...'),
          _buildInfoRow('Package', _packageInfo?.packageName ?? '...'),
          _buildInfoRow('Plateforme', 'Android / iOS'),
          _buildInfoRow('Framework', 'Flutter 3.x'),
        ],
      ),
    );
  }

  /// Ligne d'information
  Widget _buildInfoRow(String label, String value) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 4),
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceBetween,
        children: [
          Text(
            label,
            style: AppTypography.bodyTextSmall.copyWith(color: AppColors.textSecondaryLight),
          ),
          Flexible(
            child: Text(
              value,
              style: AppTypography.actionText.copyWith(fontSize: 12),
              textAlign: TextAlign.end,
            ),
          ),
        ],
      ),
    );
  }

  /// Section équipe de développement
  Widget _buildTeamSection() {
    return CoreCard(
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            'ÉQUIPE',
            style: AppTypography.subtitleSmall.copyWith(fontWeight: FontWeight.bold, letterSpacing: 1.1),
          ),
          const SizedBox(height: 8),
          _buildTeamMember(
            'UnionFlow Team',
            'Architecture & Dev',
            Icons.code,
            AppColors.primaryGreen,
          ),
          _buildTeamMember(
            'Design System',
            'UI / UX Focus',
            Icons.design_services,
            AppColors.brandGreenLight,
          ),
        ],
      ),
    );
  }

  /// Membre de l'équipe
  Widget _buildTeamMember(String name, String role, IconData icon, Color color) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 6),
      child: Row(
        children: [
          Container(
            padding: const EdgeInsets.all(6),
            decoration: BoxDecoration(
              color: color.withOpacity(0.1),
              borderRadius: BorderRadius.circular(8),
            ),
            child: Icon(icon, color: color, size: 16),
          ),
          const SizedBox(width: 12),
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(name, style: AppTypography.actionText.copyWith(fontSize: 12)),
                Text(role, style: AppTypography.subtitleSmall.copyWith(fontSize: 10)),
              ],
            ),
          ),
        ],
      ),
    );
  }

  /// Section fonctionnalités
  Widget _buildFeaturesSection() {
    return CoreCard(
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            'FONCTIONNALITÉS',
            style: AppTypography.subtitleSmall.copyWith(fontWeight: FontWeight.bold, letterSpacing: 1.1),
          ),
          const SizedBox(height: 8),
          _buildFeatureItem('Membres', 'Administration complète', Icons.people, AppColors.primaryGreen),
          _buildFeatureItem('Organisations', 'Syndicats & Fédérations', Icons.business, AppColors.brandGreenLight),
          _buildFeatureItem('Événements', 'Planification & Suivi', Icons.event, AppColors.success),
          _buildFeatureItem('Sécurité', 'Auth Keycloak OIDC', Icons.security, AppColors.warning),
        ],
      ),
    );
  }

  /// Élément de fonctionnalité
  Widget _buildFeatureItem(String title, String description, IconData icon, Color color) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 6),
      child: Row(
        children: [
          Icon(icon, color: color, size: 16),
          const SizedBox(width: 12),
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(title, style: AppTypography.actionText.copyWith(fontSize: 12)),
                Text(description, style: AppTypography.subtitleSmall.copyWith(fontSize: 10)),
              ],
            ),
          ),
        ],
      ),
    );
  }

  /// Section liens utiles
  Widget _buildLinksSection() {
    return CoreCard(
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            'LIENS UTILES',
            style: AppTypography.subtitleSmall.copyWith(fontWeight: FontWeight.bold, letterSpacing: 1.1),
          ),
          const SizedBox(height: 8),
          _buildLinkItem('Site Web', 'https://unionflow.com', Icons.web, () => _launchUrl('https://unionflow.com')),
          _buildLinkItem('Documentation', 'Guide d\'utilisation', Icons.book, () => _launchUrl('https://docs.unionflow.com')),
          _buildLinkItem('Confidentialité', 'Protection des données', Icons.privacy_tip, () => _launchUrl('https://unionflow.com/privacy')),
          _buildLinkItem('Évaluer l\'app', 'Noter sur le store', Icons.star, _showRatingDialog),
        ],
      ),
    );
  }

  /// Élément de lien
  Widget _buildLinkItem(String title, String subtitle, IconData icon, VoidCallback onTap) {
    return InkWell(
      onTap: onTap,
      borderRadius: BorderRadius.circular(4),
      child: Padding(
        padding: const EdgeInsets.symmetric(vertical: 4),
        child: Row(
          children: [
            Icon(icon, color: AppColors.primaryGreen, size: 16),
            const SizedBox(width: 12),
            Expanded(
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text(title, style: AppTypography.actionText.copyWith(fontSize: 12)),
                  Text(subtitle, style: AppTypography.subtitleSmall.copyWith(fontSize: 10)),
                ],
              ),
            ),
            const Icon(Icons.chevron_right, color: AppColors.textSecondaryLight, size: 14),
          ],
        ),
      ),
    );
  }

  /// Section support
  Widget _buildSupportSection() {
    return CoreCard(
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            'SUPPORT',
            style: AppTypography.subtitleSmall.copyWith(fontWeight: FontWeight.bold, letterSpacing: 1.1),
          ),
          const SizedBox(height: 8),
          _buildSupportItem('Email', 'support@unionflow.com', Icons.email, () => _launchUrl('mailto:support@unionflow.com')),
          _buildSupportItem('Bug', 'Signaler un problème', Icons.bug_report, () => _showBugReportDialog()),
          const SizedBox(height: 12),
          const Center(
            child: Column(
              children: [
                Text('© 2024 UNIONFLOW', style: AppTypography.badgeText),
                Text('Fait avec ❤️ pour les syndicats', style: AppTypography.subtitleSmall),
              ],
            ),
          ),
        ],
      ),
    );
  }

  /// Élément de support
  Widget _buildSupportItem(String title, String subtitle, IconData icon, VoidCallback onTap) {
    return InkWell(
      onTap: onTap,
      borderRadius: BorderRadius.circular(4),
      child: Padding(
        padding: const EdgeInsets.symmetric(vertical: 4),
        child: Row(
          children: [
            Icon(icon, color: AppColors.error, size: 16),
            const SizedBox(width: 12),
            Expanded(
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text(title, style: AppTypography.actionText.copyWith(fontSize: 12)),
                  Text(subtitle, style: AppTypography.subtitleSmall.copyWith(fontSize: 10)),
                ],
              ),
            ),
            const Icon(Icons.chevron_right, color: AppColors.textSecondaryLight, size: 14),
          ],
        ),
      ),
    );
  }

  /// Lancer une URL
  Future<void> _launchUrl(String url) async {
    try {
      final uri = Uri.parse(url);
      if (await canLaunchUrl(uri)) {
        await launchUrl(uri, mode: LaunchMode.externalApplication);
      } else {
        _showErrorSnackBar('Impossible d\'ouvrir le lien');
      }
    } catch (e) {
      _showErrorSnackBar('Erreur lors de l\'ouverture du lien');
    }
  }

  /// Afficher le dialogue de rapport de bug
  void _showBugReportDialog() {
    showDialog(
      context: context,
      builder: (context) => AlertDialog(
        title: const Text('Signaler un bug'),
        content: const Text(
          'Pour signaler un bug, veuillez envoyer un email à support@unionflow.com '
          'en décrivant le problème rencontré et les étapes pour le reproduire.',
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.of(context).pop(),
            child: const Text('Fermer'),
          ),
          ElevatedButton(
            onPressed: () {
              Navigator.of(context).pop();
              _launchUrl('mailto:support@unionflow.com?subject=Rapport de bug - UnionFlow Mobile');
            },
            style: ElevatedButton.styleFrom(
              backgroundColor: AppColors.primaryGreen,
              foregroundColor: Colors.white,
            ),
            child: const Text('Envoyer un email'),
          ),
        ],
      ),
    );
  }

  /// Afficher le dialogue de demande de fonctionnalité
  void _showFeatureRequestDialog() {
    showDialog(
      context: context,
      builder: (context) => AlertDialog(
        title: const Text('Suggérer une amélioration'),
        content: const Text(
          'Nous sommes toujours à l\'écoute de vos suggestions ! '
          'Envoyez-nous vos idées d\'amélioration par email.',
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.of(context).pop(),
            child: const Text('Fermer'),
          ),
          ElevatedButton(
            onPressed: () {
              Navigator.of(context).pop();
              _launchUrl('mailto:support@unionflow.com?subject=Suggestion d\'amélioration - UnionFlow Mobile');
            },
            style: ElevatedButton.styleFrom(
              backgroundColor: AppColors.primaryGreen,
              foregroundColor: Colors.white,
            ),
            child: const Text('Envoyer une suggestion'),
          ),
        ],
      ),
    );
  }

  /// Afficher le dialogue d'évaluation
  void _showRatingDialog() {
    showDialog(
      context: context,
      builder: (context) => AlertDialog(
        title: const Text('Évaluer l\'application'),
        content: const Text(
          'Votre avis nous aide à améliorer UnionFlow ! '
          'Prenez quelques secondes pour évaluer l\'application sur votre store.',
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.of(context).pop(),
            child: const Text('Plus tard'),
          ),
          ElevatedButton(
            onPressed: () {
              Navigator.of(context).pop();
              _launchStoreForRating();
            },
            style: ElevatedButton.styleFrom(
              backgroundColor: AppColors.primaryGreen,
              foregroundColor: Colors.white,
            ),
            child: const Text('Évaluer maintenant'),
          ),
        ],
      ),
    );
  }

  /// Partager les infos de l'app (titre, description, lien)
  Future<void> _shareApp() async {
    final version = _packageInfo != null
        ? '${_packageInfo!.version}+${_packageInfo!.buildNumber}'
        : '';
    await Share.share(
      'Découvrez UnionFlow - Mouvement d\'entraide et de solidarité.\n'
      'Version $version\n'
      'https://unionflow.com',
      subject: 'UnionFlow - Application mobile',
    );
  }

  /// Ouvrir le store (Play Store / App Store) pour noter l'app
  Future<void> _launchStoreForRating() async {
    try {
      final packageName = _packageInfo?.packageName ?? 'dev.lions.unionflow';
      String storeUrl;
      if (kIsWeb) {
        storeUrl = 'https://unionflow.com';
      } else if (defaultTargetPlatform == TargetPlatform.android) {
        storeUrl = 'https://play.google.com/store/apps/details?id=$packageName';
      } else if (defaultTargetPlatform == TargetPlatform.iOS) {
        // Remplacer par l'ID App Store réel une fois l'app publiée
        storeUrl = 'https://apps.apple.com/app/id0000000000';
      } else {
        storeUrl = 'https://unionflow.com';
      }
      final uri = Uri.parse(storeUrl);
      if (await canLaunchUrl(uri)) {
        await launchUrl(uri, mode: LaunchMode.externalApplication);
      } else {
        _showErrorSnackBar('Impossible d\'ouvrir le store');
      }
    } catch (e) {
      _showErrorSnackBar('Erreur lors de l\'ouverture du store');
    }
  }

  /// Afficher un message d'erreur
  void _showErrorSnackBar(String message) {
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(
        content: Text(message),
        backgroundColor: AppColors.error,
        behavior: SnackBarBehavior.floating,
      ),
    );
  }
}