import 'package:flutter/material.dart';

/// Page Sauvegarde & Restauration - UnionFlow Mobile
/// 
/// Page complète de gestion des sauvegardes avec création, restauration,
/// planification et monitoring des sauvegardes système.
class BackupPage extends StatefulWidget {
  const BackupPage({super.key});

  @override
  State<BackupPage> createState() => _BackupPageState();
}

class _BackupPageState extends State<BackupPage>
    with TickerProviderStateMixin {
  late TabController _tabController;
  
  bool _autoBackupEnabled = true;
  String _selectedFrequency = 'Quotidien';
  String _selectedRetention = '30 jours';
  
  final List<String> _frequencies = ['Horaire', 'Quotidien', 'Hebdomadaire'];
  final List<String> _retentions = ['7 jours', '30 jours', '90 jours', '1 an'];

  @override
  void initState() {
    super.initState();
    _tabController = TabController(length: 3, vsync: this);
  }

  @override
  void dispose() {
    _tabController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: const Color(0xFFF8F9FA),
      body: Column(
        children: [
          _buildHeader(),
          _buildTabBar(),
          Expanded(
            child: TabBarView(
              controller: _tabController,
              children: [
                _buildBackupsTab(),
                _buildScheduleTab(),
                _buildRestoreTab(),
              ],
            ),
          ),
        ],
      ),
    );
  }

  /// Header harmonisé
  Widget _buildHeader() {
    return Container(
      margin: const EdgeInsets.all(12),
      padding: const EdgeInsets.all(20),
      decoration: BoxDecoration(
        gradient: const LinearGradient(
          colors: [Color(0xFF6C5CE7), Color(0xFF5A4FCF)],
          begin: Alignment.topLeft,
          end: Alignment.bottomRight,
        ),
        borderRadius: BorderRadius.circular(16),
        boxShadow: [
          BoxShadow(
            color: const Color(0xFF6C5CE7).withOpacity(0.3),
            blurRadius: 20,
            offset: const Offset(0, 8),
          ),
        ],
      ),
      child: Column(
        children: [
          Row(
            children: [
              Container(
                padding: const EdgeInsets.all(12),
                decoration: BoxDecoration(
                  color: Colors.white.withOpacity(0.2),
                  borderRadius: BorderRadius.circular(12),
                ),
                child: const Icon(
                  Icons.backup,
                  color: Colors.white,
                  size: 24,
                ),
              ),
              const SizedBox(width: 16),
              Expanded(
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    const Text(
                      'Sauvegarde & Restauration',
                      style: TextStyle(
                        fontSize: 20,
                        fontWeight: FontWeight.bold,
                        color: Colors.white,
                      ),
                    ),
                    Text(
                      'Gestion des sauvegardes système',
                      style: TextStyle(
                        fontSize: 14,
                        color: Colors.white.withOpacity(0.8),
                      ),
                    ),
                  ],
                ),
              ),
              Container(
                decoration: BoxDecoration(
                  color: Colors.white.withOpacity(0.2),
                  borderRadius: BorderRadius.circular(8),
                ),
                child: IconButton(
                  onPressed: () => _createBackupNow(),
                  icon: const Icon(
                    Icons.save,
                    color: Colors.white,
                  ),
                  tooltip: 'Sauvegarde immédiate',
                ),
              ),
            ],
          ),
          const SizedBox(height: 16),
          Row(
            children: [
              Expanded(
                child: _buildStatCard('Dernière sauvegarde', '2h', Icons.schedule),
              ),
              const SizedBox(width: 12),
              Expanded(
                child: _buildStatCard('Taille totale', '2.3 GB', Icons.storage),
              ),
              const SizedBox(width: 12),
              Expanded(
                child: _buildStatCard('Statut', 'OK', Icons.check_circle),
              ),
            ],
          ),
        ],
      ),
    );
  }

  /// Carte de statistique
  Widget _buildStatCard(String label, String value, IconData icon) {
    return Container(
      padding: const EdgeInsets.all(12),
      decoration: BoxDecoration(
        color: Colors.white.withOpacity(0.15),
        borderRadius: BorderRadius.circular(12),
      ),
      child: Column(
        children: [
          Icon(icon, color: Colors.white, size: 20),
          const SizedBox(height: 4),
          Text(
            value,
            style: const TextStyle(
              fontSize: 14,
              fontWeight: FontWeight.bold,
              color: Colors.white,
            ),
          ),
          Text(
            label,
            style: TextStyle(
              fontSize: 10,
              color: Colors.white.withOpacity(0.8),
            ),
            textAlign: TextAlign.center,
          ),
        ],
      ),
    );
  }

  /// Barre d'onglets
  Widget _buildTabBar() {
    return Container(
      margin: const EdgeInsets.symmetric(horizontal: 12),
      decoration: BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.circular(16),
        boxShadow: [
          BoxShadow(
            color: Colors.black.withOpacity(0.05),
            blurRadius: 10,
            offset: const Offset(0, 2),
          ),
        ],
      ),
      child: TabBar(
        controller: _tabController,
        labelColor: const Color(0xFF6C5CE7),
        unselectedLabelColor: Colors.grey[600],
        indicatorColor: const Color(0xFF6C5CE7),
        indicatorWeight: 3,
        labelStyle: const TextStyle(fontWeight: FontWeight.w600, fontSize: 12),
        tabs: const [
          Tab(icon: Icon(Icons.folder, size: 18), text: 'Sauvegardes'),
          Tab(icon: Icon(Icons.schedule, size: 18), text: 'Planification'),
          Tab(icon: Icon(Icons.restore, size: 18), text: 'Restauration'),
        ],
      ),
    );
  }

  /// Onglet sauvegardes
  Widget _buildBackupsTab() {
    return SingleChildScrollView(
      padding: const EdgeInsets.all(12),
      child: Column(
        children: [
          const SizedBox(height: 16),
          _buildBackupsList(),
          const SizedBox(height: 80),
        ],
      ),
    );
  }

  /// Liste des sauvegardes
  Widget _buildBackupsList() {
    final backups = [
      {'name': 'Sauvegarde automatique', 'date': '15/12/2024 02:00', 'size': '2.3 GB', 'type': 'Auto'},
      {'name': 'Sauvegarde manuelle', 'date': '14/12/2024 14:30', 'size': '2.1 GB', 'type': 'Manuel'},
      {'name': 'Sauvegarde automatique', 'date': '14/12/2024 02:00', 'size': '2.2 GB', 'type': 'Auto'},
    ];

    return Container(
      padding: const EdgeInsets.all(16),
      decoration: BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.circular(16),
        boxShadow: [
          BoxShadow(
            color: Colors.black.withOpacity(0.05),
            blurRadius: 10,
            offset: const Offset(0, 2),
          ),
        ],
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            children: [
              const Icon(Icons.folder, color: Color(0xFF6C5CE7), size: 20),
              const SizedBox(width: 8),
              Text(
                'Sauvegardes disponibles',
                style: TextStyle(
                  fontSize: 16,
                  fontWeight: FontWeight.w600,
                  color: Colors.grey[800],
                ),
              ),
            ],
          ),
          const SizedBox(height: 16),
          ...backups.map((backup) => _buildBackupItem(backup)),
        ],
      ),
    );
  }

  /// Élément de sauvegarde
  Widget _buildBackupItem(Map<String, String> backup) {
    return Container(
      margin: const EdgeInsets.only(bottom: 12),
      padding: const EdgeInsets.all(12),
      decoration: BoxDecoration(
        color: Colors.grey[50],
        borderRadius: BorderRadius.circular(12),
      ),
      child: Row(
        children: [
          Icon(
            backup['type'] == 'Auto' ? Icons.schedule : Icons.touch_app,
            color: backup['type'] == 'Auto' ? Colors.blue : Colors.green,
            size: 20,
          ),
          const SizedBox(width: 12),
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(
                  backup['name']!,
                  style: const TextStyle(
                    fontSize: 14,
                    fontWeight: FontWeight.w600,
                    color: Color(0xFF1F2937),
                  ),
                ),
                Text(
                  '${backup['date']} • ${backup['size']}',
                  style: TextStyle(
                    fontSize: 12,
                    color: Colors.grey[600],
                  ),
                ),
              ],
            ),
          ),
          PopupMenuButton<String>(
            onSelected: (action) => _handleBackupAction(backup, action),
            itemBuilder: (context) => [
              const PopupMenuItem(value: 'restore', child: Text('Restaurer')),
              const PopupMenuItem(value: 'download', child: Text('Télécharger')),
              const PopupMenuItem(value: 'delete', child: Text('Supprimer')),
            ],
            child: const Icon(Icons.more_vert, color: Colors.grey),
          ),
        ],
      ),
    );
  }

  /// Onglet planification
  Widget _buildScheduleTab() {
    return SingleChildScrollView(
      padding: const EdgeInsets.all(12),
      child: Column(
        children: [
          const SizedBox(height: 16),
          _buildScheduleSettings(),
          const SizedBox(height: 80),
        ],
      ),
    );
  }

  /// Paramètres de planification
  Widget _buildScheduleSettings() {
    return Container(
      padding: const EdgeInsets.all(16),
      decoration: BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.circular(16),
        boxShadow: [
          BoxShadow(
            color: Colors.black.withOpacity(0.05),
            blurRadius: 10,
            offset: const Offset(0, 2),
          ),
        ],
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            children: [
              const Icon(Icons.schedule, color: Color(0xFF6C5CE7), size: 20),
              const SizedBox(width: 8),
              Text(
                'Configuration automatique',
                style: TextStyle(
                  fontSize: 16,
                  fontWeight: FontWeight.w600,
                  color: Colors.grey[800],
                ),
              ),
            ],
          ),
          const SizedBox(height: 16),
          _buildSwitchSetting(
            'Sauvegarde automatique',
            'Activer les sauvegardes programmées',
            _autoBackupEnabled,
            (value) => setState(() => _autoBackupEnabled = value),
          ),
          const SizedBox(height: 12),
          _buildDropdownSetting(
            'Fréquence',
            _selectedFrequency,
            _frequencies,
            (value) => setState(() => _selectedFrequency = value!),
          ),
          const SizedBox(height: 12),
          _buildDropdownSetting(
            'Rétention',
            _selectedRetention,
            _retentions,
            (value) => setState(() => _selectedRetention = value!),
          ),
        ],
      ),
    );
  }

  /// Onglet restauration
  Widget _buildRestoreTab() {
    return SingleChildScrollView(
      padding: const EdgeInsets.all(12),
      child: Column(
        children: [
          const SizedBox(height: 16),
          _buildRestoreOptions(),
          const SizedBox(height: 80),
        ],
      ),
    );
  }

  /// Options de restauration
  Widget _buildRestoreOptions() {
    return Container(
      padding: const EdgeInsets.all(16),
      decoration: BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.circular(16),
        boxShadow: [
          BoxShadow(
            color: Colors.black.withOpacity(0.05),
            blurRadius: 10,
            offset: const Offset(0, 2),
          ),
        ],
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            children: [
              const Icon(Icons.restore, color: Color(0xFF6C5CE7), size: 20),
              const SizedBox(width: 8),
              Text(
                'Options de restauration',
                style: TextStyle(
                  fontSize: 16,
                  fontWeight: FontWeight.w600,
                  color: Colors.grey[800],
                ),
              ),
            ],
          ),
          const SizedBox(height: 16),
          _buildActionButton(
            'Restaurer depuis un fichier',
            'Importer une sauvegarde externe',
            Icons.file_upload,
            const Color(0xFF0984E3),
            () => _restoreFromFile(),
          ),
          const SizedBox(height: 12),
          _buildActionButton(
            'Restauration sélective',
            'Restaurer uniquement certaines données',
            Icons.checklist,
            const Color(0xFF00B894),
            () => _selectiveRestore(),
          ),
          const SizedBox(height: 12),
          _buildActionButton(
            'Point de restauration',
            'Créer un point de restauration avant modification',
            Icons.bookmark,
            const Color(0xFFE17055),
            () => _createRestorePoint(),
          ),
        ],
      ),
    );
  }

  // Méthodes de construction des composants
  Widget _buildSwitchSetting(String title, String subtitle, bool value, Function(bool) onChanged) {
    return Row(
      children: [
        Expanded(
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Text(title, style: const TextStyle(fontSize: 14, fontWeight: FontWeight.w600)),
              Text(subtitle, style: TextStyle(fontSize: 12, color: Colors.grey[600])),
            ],
          ),
        ),
        Switch(value: value, onChanged: onChanged, activeColor: const Color(0xFF6C5CE7)),
      ],
    );
  }

  Widget _buildDropdownSetting(String title, String value, List<String> options, Function(String?) onChanged) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Text(title, style: const TextStyle(fontSize: 14, fontWeight: FontWeight.w600)),
        const SizedBox(height: 8),
        Container(
          padding: const EdgeInsets.symmetric(horizontal: 12),
          decoration: BoxDecoration(
            color: Colors.grey[50],
            borderRadius: BorderRadius.circular(8),
            border: Border.all(color: Colors.grey[300]!),
          ),
          child: DropdownButtonHideUnderline(
            child: DropdownButton<String>(
              value: value,
              isExpanded: true,
              onChanged: onChanged,
              items: options.map((option) => DropdownMenuItem(value: option, child: Text(option))).toList(),
            ),
          ),
        ),
      ],
    );
  }

  Widget _buildActionButton(String title, String subtitle, IconData icon, Color color, VoidCallback onTap) {
    return InkWell(
      onTap: onTap,
      borderRadius: BorderRadius.circular(12),
      child: Container(
        padding: const EdgeInsets.all(12),
        decoration: BoxDecoration(
          color: color.withOpacity(0.05),
          borderRadius: BorderRadius.circular(12),
          border: Border.all(color: color.withOpacity(0.1)),
        ),
        child: Row(
          children: [
            Icon(icon, color: color, size: 20),
            const SizedBox(width: 12),
            Expanded(
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text(title, style: TextStyle(fontSize: 14, fontWeight: FontWeight.w600, color: color)),
                  Text(subtitle, style: TextStyle(fontSize: 12, color: Colors.grey[600])),
                ],
              ),
            ),
            Icon(Icons.arrow_forward_ios, color: Colors.grey[400], size: 16),
          ],
        ),
      ),
    );
  }

  // Méthodes d'action
  void _createBackupNow() => _showSuccessSnackBar('Sauvegarde créée avec succès');
  void _handleBackupAction(Map<String, String> backup, String action) => _showSuccessSnackBar('Action "$action" exécutée');
  void _restoreFromFile() => _showSuccessSnackBar('Sélection de fichier de restauration');
  void _selectiveRestore() => _showSuccessSnackBar('Mode de restauration sélective');
  void _createRestorePoint() => _showSuccessSnackBar('Point de restauration créé');

  void _showSuccessSnackBar(String message) {
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(content: Text(message), backgroundColor: const Color(0xFF00B894), behavior: SnackBarBehavior.floating),
    );
  }
}