import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:flutter/services.dart';
import '../../core/theme/theme_provider.dart';
import 'dart:convert';
import 'package:crypto/crypto.dart';
import 'package:http/http.dart' as http;
import '../../core/constants/app_constants.dart';
import '../../core/theme/app_theme.dart';
import '../../services/wallet_identity_service.dart';
import '../garage/weapon_list_screen.dart';

class SettingsScreen extends StatefulWidget {
  const SettingsScreen({super.key});

  @override
  State<SettingsScreen> createState() => _SettingsScreenState();
}

class _SettingsScreenState extends State<SettingsScreen> {
  final WalletIdentityService _walletService = WalletIdentityService();
  String? _identityPhrase;
  int? _photoCount;
  bool _isLoadingStats = false;
  bool _isUploadEnabled = false;

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

  Future<void> _loadIdentity() async {
    final phrase = await _walletService.getIdentityPhrase();
    final isEnabled = await _walletService.isUploadEnabled();
    if (mounted) {
      setState(() {
        _identityPhrase = phrase;
        _isUploadEnabled = isEnabled;
      });
      _fetchStats(phrase);
    }
  }

  Future<void> _fetchStats(String phrase) async {
    setState(() => _isLoadingStats = true);
    try {
      final phraseBytes = utf8.encode(phrase);
      final walletHash = sha256.convert(phraseBytes).toString();
      
      // Utilise 10.0.2.2 pour l'émulateur Android, sinon localhost
      final baseUrl = Theme.of(context).platform == TargetPlatform.android 
          ? 'http://10.0.2.2:3000' 
          : 'http://localhost:3000';
          
      final response = await http.get(Uri.parse('$baseUrl/api/stats/$walletHash'));
      
      if (response.statusCode == 200) {
        final data = jsonDecode(response.body);
        if (mounted) {
          setState(() {
            _photoCount = data['stats']['photo_count'] ?? 0;
            _isLoadingStats = false;
          });
        }
      } else {
        if (mounted) setState(() => _isLoadingStats = false);
      }
    } catch (e) {
      print('Erreur lors du chargement des statistiques: $e');
      if (mounted) setState(() => _isLoadingStats = false);
    }
  }

  void _copyToClipboard() {
    if (_identityPhrase != null) {
      Clipboard.setData(ClipboardData(text: _identityPhrase!));
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(
          content: Text('Identité copiée dans le presse-papiers'),
          backgroundColor: AppTheme.successColor,
        ),
      );
    }
  }

  void _showThemeDialog() {
    showDialog(
      context: context,
      builder: (context) => AlertDialog(
        title: const Text('Apparence'),
        content: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            _buildThemeOption(ThemeMode.system, 'Automatique', Icons.brightness_auto),
            _buildThemeOption(ThemeMode.light, 'Clair', Icons.light_mode),
            _buildThemeOption(ThemeMode.dark, 'Sombre', Icons.dark_mode),
          ],
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(context),
            child: const Text('Fermer'),
          ),
        ],
      ),
    );
  }

  Widget _buildThemeOption(ThemeMode mode, String label, IconData icon) {
    final themeProvider = context.watch<ThemeProvider>();
    final isSelected = themeProvider.themeMode == mode;
    
    return ListTile(
      leading: Icon(icon, color: isSelected ? AppTheme.primaryColor : null),
      title: Text(label, style: TextStyle(
        fontWeight: isSelected ? FontWeight.bold : FontWeight.normal,
        color: isSelected ? AppTheme.primaryColor : null,
      )),
      trailing: isSelected ? const Icon(Icons.check, color: AppTheme.primaryColor) : null,
      onTap: () {
        themeProvider.setThemeMode(mode);
        Navigator.pop(context);
      },
    );
  }

  void _showIdentityDialog() {
    if (_identityPhrase == null) return;
    
    showDialog(
      context: context,
      builder: (context) => AlertDialog(
        title: const Text('Votre Identité Unique', textAlign: TextAlign.center),
        content: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            const Icon(Icons.security, size: 48, color: AppTheme.primaryColor),
            const SizedBox(height: 16),
            const Text(
              'Cette phrase de 15 mots vous identifie de manière unique. Ne la partagez qu\'en cas de besoin.',
              textAlign: TextAlign.center,
              style: TextStyle(fontSize: 14, color: Colors.grey),
            ),
            const SizedBox(height: 24),
            Container(
              padding: const EdgeInsets.all(16),
              decoration: BoxDecoration(
                color: Colors.grey.withAlpha(20),
                borderRadius: BorderRadius.circular(8),
                border: Border.all(color: AppTheme.primaryColor.withAlpha(100)),
              ),
              child: Text(
                _identityPhrase!,
                style: const TextStyle(
                  fontSize: 16,
                  fontWeight: FontWeight.w600,
                  letterSpacing: 0.5,
                  height: 1.5,
                ),
                textAlign: TextAlign.center,
              ),
            ),
          ],
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(context),
            child: const Text('Fermer'),
          ),
          ElevatedButton.icon(
            icon: const Icon(Icons.copy, size: 18),
            label: const Text('Copier'),
            onPressed: () {
              _copyToClipboard();
              Navigator.pop(context);
            },
          ),
        ],
      ),
    );
  }

  void _showOptInDisclaimer(bool value) {
    if (!value) {
      // Si on désactive, pas besoin de disclaimer, on le fait direct.
      _walletService.setUploadEnabled(false);
      setState(() {
        _isUploadEnabled = false;
      });
      return;
    }

    showDialog(
      context: context,
      barrierDismissible: false,
      builder: (context) => AlertDialog(
        title: const Text('Participer à l\'entraînement IA', textAlign: TextAlign.center),
        content: const Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            Icon(Icons.psychology, size: 48, color: AppTheme.primaryColor),
            SizedBox(height: 16),
            Text(
              'En activant cette option, vous acceptez d\'envoyer vos photos de cibles à notre serveur sécurisé.',
              style: TextStyle(fontWeight: FontWeight.bold),
              textAlign: TextAlign.center,
            ),
            SizedBox(height: 12),
            Text(
              '🔒 Anonymat Garanti : L\'envoi est totalement anonymisé. Votre identité est remplacée par un hash cryptographique incassable.',
              style: TextStyle(fontSize: 13),
            ),
            SizedBox(height: 12),
            Text(
              '🎁 Avantages Futurs : Votre contribution (Hash de Wallet) sera comptabilisée. Lors de la sortie publique de notre IA, les participants actifs recevront des fonctionnalités premium ou des badges exclusifs en récompense !',
              style: TextStyle(fontSize: 13),
            ),
          ],
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(context),
            child: const Text('Refuser', style: TextStyle(color: Colors.grey)),
          ),
          ElevatedButton(
            style: ElevatedButton.styleFrom(backgroundColor: AppTheme.primaryColor),
            onPressed: () {
              _walletService.setUploadEnabled(true);
              setState(() {
                _isUploadEnabled = true;
              });
              Navigator.pop(context);
              ScaffoldMessenger.of(context).showSnackBar(
                const SnackBar(
                  content: Text('Merci pour votre contribution !'),
                  backgroundColor: AppTheme.successColor,
                ),
              );
            },
            child: const Text('J\'accepte', style: TextStyle(color: Colors.white)),
          ),
        ],
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Paramètres'),
      ),
      body: ListView(
        padding: const EdgeInsets.all(AppConstants.defaultPadding),
        children: [
          _buildSectionHeader('Identité'),
          _buildSettingsTile(
            context: context,
            icon: Icons.fingerprint,
            title: 'Identité Wallet',
            subtitle: _identityPhrase != null ? 'Phrase de 15 mots générée' : 'Génération en cours...',
            onTap: _showIdentityDialog,
          ),
          Consumer<ThemeProvider>(
            builder: (context, themeProvider, child) {
              return _buildSettingsTile(
                context: context,
                icon: Icons.color_lens_outlined,
                title: 'Apparence',
                subtitle: themeProvider.themeModeName,
                onTap: _showThemeDialog,
              );
            },
          ),
          
          const SizedBox(height: 24),
          _buildSectionHeader('Gestion'),
          _buildSettingsTile(
            context: context,
            icon: Icons.shield_outlined,
            title: 'Mon Armurerie',
            subtitle: 'Gérer mes armes et équipements',
            onTap: () async {
              await Navigator.push(
                context,
                MaterialPageRoute(builder: (_) => const WeaponListScreen()),
              );
            },
          ),
          
          const SizedBox(height: 24),
          _buildSectionHeader('Configuration Serveur IA'),
          Card(
            elevation: 0,
            color: Colors.transparent,
            margin: const EdgeInsets.only(bottom: 8.0),
            child: SwitchListTile(
              contentPadding: const EdgeInsets.symmetric(horizontal: 16.0, vertical: 4.0),
              title: const Text('Participer à l\'entraînement IA', style: TextStyle(fontWeight: FontWeight.w500)),
              subtitle: const Text('Aidez-nous à améliorer la détection tout en gagnant des avantages', style: TextStyle(fontSize: 12)),
              secondary: const Icon(Icons.psychology, color: AppTheme.textPrimary),
              value: _isUploadEnabled,
              activeColor: AppTheme.primaryColor,
              shape: RoundedRectangleBorder(
                borderRadius: BorderRadius.circular(12.0),
                side: BorderSide(color: Colors.grey.withAlpha(50), width: 1),
              ),
              onChanged: _showOptInDisclaimer,
            ),
          ),
          if (_isUploadEnabled)
            _buildSettingsTile(
              context: context,
              icon: Icons.cloud_outlined,
              title: 'Adresse du Serveur IA',
              subtitle: 'http://localhost:3000/api/upload',
              onTap: () {
                ScaffoldMessenger.of(context).showSnackBar(
                  const SnackBar(content: Text('Changement d\'adresse à venir')),
                );
              },
            ),
          if (_isUploadEnabled)
            _buildSettingsTile(
            context: context,
            icon: Icons.data_usage,
            title: 'Photos Exportées',
            subtitle: _isLoadingStats 
                ? 'Chargement...' 
                : (_photoCount != null ? '$_photoCount photos envoyées à l\'IA' : 'Non disponible'),
            onTap: () {
              if (_identityPhrase != null) {
                _fetchStats(_identityPhrase!);
              }
            },
          ),

          const SizedBox(height: 24),
          _buildSectionHeader('À propos'),
          _buildSettingsTile(
            context: context,
            icon: Icons.info_outline,
            title: 'Version de l\'application',
            subtitle: '1.0.0',
            onTap: () {},
          ),
          _buildSettingsTile(
            context: context,
            icon: Icons.privacy_tip_outlined,
            title: 'Politique de confidentialité',
            onTap: () {},
          ),
        ],
      ),
    );
  }

  Widget _buildSectionHeader(String title) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 8.0, horizontal: 4.0),
      child: Text(
        title,
        style: const TextStyle(
          fontSize: 14,
          fontWeight: FontWeight.bold,
          color: AppTheme.primaryColor,
        ),
      ),
    );
  }

  Widget _buildSettingsTile({
    required BuildContext context,
    required IconData icon,
    required String title,
    String? subtitle,
    required VoidCallback onTap,
  }) {
    return Card(
      elevation: 0,
      color: Colors.transparent,
      margin: const EdgeInsets.only(bottom: 8.0),
      child: ListTile(
        contentPadding: const EdgeInsets.symmetric(horizontal: 16.0, vertical: 4.0),
        leading: Icon(icon, color: AppTheme.textPrimary),
        title: Text(title, style: const TextStyle(fontWeight: FontWeight.w500)),
        subtitle: subtitle != null ? Text(subtitle, style: const TextStyle(fontSize: 12)) : null,
        trailing: const Icon(Icons.chevron_right, color: Colors.grey),
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(12.0),
          side: BorderSide(color: Colors.grey.withAlpha(50), width: 1),
        ),
        onTap: onTap,
      ),
    );
  }
}