// ===========================================================================
// FILE: lib/ui/profile/profile_screen.dart
// ===========================================================================

import 'dart:ui';
import 'dart:math';
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:shared_preferences/shared_preferences.dart';

import '../../core/theme_manager.dart';
import '../../core/app_colors.dart';
import '../../services/storage_service.dart';
import '../../widgets/painters.dart';
import '../../widgets/cyber_border.dart';

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

  @override
  State<ProfileScreen> createState() => _ProfileScreenState();
}

class _ProfileScreenState extends State<ProfileScreen> {
  final TextEditingController _nameController = TextEditingController();
  final TextEditingController _passController = TextEditingController();

  bool _isLoading = false;
  bool _obscurePassword = true;
  String _errorMessage = "";
  List<String> _nameSuggestions = [];

  bool _isGhostMode = false;
  late User _currentUser;

  @override
  void initState() {
    super.initState();
    _currentUser = FirebaseAuth.instance.currentUser!;
    _loadGhostMode();
  }

  @override
  void dispose() {
    _nameController.dispose();
    _passController.dispose();
    super.dispose();
  }

  Future<void> _loadGhostMode() async {
    try {
      var doc = await FirebaseFirestore.instance.collection('leaderboard').doc(_currentUser.uid).get();
      if (doc.exists && doc.data()!.containsKey('isGhost')) {
        setState(() {
          _isGhostMode = doc.data()!['isGhost'];
        });
      }
    } catch (e) {
      debugPrint("Errore caricamento Ghost Mode: $e");
    }
  }

  Future<void> _toggleGhostMode(bool value) async {
    setState(() => _isGhostMode = value);
    try {
      await FirebaseFirestore.instance.collection('leaderboard').doc(_currentUser.uid).set(
          {'isGhost': value}, SetOptions(merge: true)
      );
    } catch (e) {
      debugPrint("Errore salvataggio Ghost Mode: $e");
    }
  }

  String _getPlayerTitle(int level) {
    if (level < 10) return "Principiante";
    if (level < 20) return "Apprendista";
    if (level < 40) return "Sfidante";
    if (level < 60) return "Tattico dell'Arena";
    if (level < 80) return "Maestro dei Quadrati";
    if (level < 100) return "Gran Maestro";
    if (level < 130) return "Campione della Griglia";
    if (level < 160) return "Entità Digitale";
    if (level < 200) return "Oracolo del Codice";
    return "Leggenda Suprema";
  }

  Future<void> _handleRegistration() async {
    final name = _nameController.text.trim().toUpperCase();
    final password = _passController.text.trim();

    setState(() { _errorMessage = ""; _nameSuggestions.clear(); _isLoading = true; });

    if (name.isEmpty || password.isEmpty) {
      setState(() { _errorMessage = "Compila tutti i campi!"; _isLoading = false; });
      return;
    }
    if (password.length < 6) {
      setState(() { _errorMessage = "Password troppo corta (min. 6 caratteri)"; _isLoading = false; });
      return;
    }

    try {
      // 1. Controllo univocità del nome
      var existingUser = await FirebaseFirestore.instance.collection('leaderboard').where('name', isEqualTo: name).get();

      if (existingUser.docs.isNotEmpty && existingUser.docs.first.id != _currentUser.uid) {
        // Nome già preso, generiamo suggerimenti
        List<String> suggestions = [];
        int attempts = 0;
        final rand = Random();
        while(suggestions.length < 3 && attempts < 15) {
          String candidate = "$name${rand.nextInt(99) + 1}";
          var check = await FirebaseFirestore.instance.collection('leaderboard').where('name', isEqualTo: candidate).get();
          if (check.docs.isEmpty && !suggestions.contains(candidate)) {
            suggestions.add(candidate);
          }
          attempts++;
        }

        setState(() {
          _errorMessage = "Nome già in uso! Scegline un altro:";
          _nameSuggestions = suggestions;
          _isLoading = false;
        });
        return;
      }

      // 2. Registrazione sicura
      final fakeEmail = "${name.replaceAll(' ', '')}@tetraq.game".toLowerCase();

      if (_currentUser.isAnonymous) {
        final credential = EmailAuthProvider.credential(email: fakeEmail, password: password);
        await _currentUser.linkWithCredential(credential);
      }

      await StorageService.instance.savePlayerName(name);
      await StorageService.instance.syncLeaderboard();

      setState(() { _isLoading = false; });
      if (mounted) ScaffoldMessenger.of(context).showSnackBar(const SnackBar(content: Text("Account Protetto con Successo!"), backgroundColor: Colors.green));

    } on FirebaseAuthException catch (e) {
      String msg = "Errore di connessione.";
      if (e.code == 'email-already-in-use' || e.code == 'credential-already-in-use') msg = "Utente già registrato. Se sei tu, fai il login.";
      setState(() { _errorMessage = msg; _isLoading = false; });
    } catch (e) {
      setState(() { _errorMessage = "Errore: $e"; _isLoading = false; });
    }
  }

  Future<void> _deleteAccount() async {
    bool confirm = await showDialog(
        context: context,
        builder: (ctx) => AlertDialog(
          backgroundColor: Colors.black87,
          title: const Text("ATTENZIONE", style: TextStyle(color: Colors.redAccent, fontWeight: FontWeight.bold)),
          content: const Text("Stai per eliminare definitivamente il tuo profilo, i tuoi XP e le statistiche.\nL'operazione è irreversibile.\n\nVuoi procedere?", style: TextStyle(color: Colors.white)),
          actions: [
            TextButton(onPressed: () => Navigator.pop(ctx, false), child: const Text("ANNULLA", style: TextStyle(color: Colors.grey))),
            ElevatedButton(
              style: ElevatedButton.styleFrom(backgroundColor: Colors.redAccent),
              onPressed: () => Navigator.pop(ctx, true),
              child: const Text("SÌ, ELIMINA", style: TextStyle(color: Colors.white, fontWeight: FontWeight.bold)),
            ),
          ],
        )
    ) ?? false;

    if (!confirm) return;

    setState(() => _isLoading = true);

    try {
      // 1. Elimina record da Firestore
      await FirebaseFirestore.instance.collection('leaderboard').doc(_currentUser.uid).delete();

      // 2. Elimina l'utente Auth
      await _currentUser.delete();

      // 3. Pulisci i dati locali sensibili
      final prefs = await SharedPreferences.getInstance();
      await prefs.remove('totalXP');
      await prefs.remove('wins');
      await prefs.remove('losses');
      await prefs.remove('cpuLevel');
      await prefs.remove('playerName');
      await prefs.remove('favorites');

      // 4. Ricrea un anonimo pulito e torna alla Home
      await FirebaseAuth.instance.signInAnonymously();
      await StorageService.instance.init();

      if (mounted) {
        Navigator.of(context).popUntil((route) => route.isFirst);
      }
    } on FirebaseAuthException catch (e) {
      setState(() => _isLoading = false);
      if (e.code == 'requires-recent-login') {
        ScaffoldMessenger.of(context).showSnackBar(const SnackBar(content: Text("Per sicurezza, riavvia l'app prima di eliminare l'account."), backgroundColor: Colors.redAccent));
      } else {
        ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text("Errore: ${e.message}"), backgroundColor: Colors.redAccent));
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    final themeManager = context.watch<ThemeManager>();
    final theme = themeManager.currentColors;
    final themeType = themeManager.currentThemeType;
    Color inkColor = const Color(0xFF111122);

    int wins = StorageService.instance.wins;
    int losses = StorageService.instance.losses;
    int totalGames = wins + losses;
    double winRate = totalGames > 0 ? (wins / totalGames) * 100 : 0.0;

    int level = StorageService.instance.playerLevel;
    String title = _getPlayerTitle(level);
    String playerName = StorageService.instance.playerName;
    if (playerName.isEmpty) playerName = "GUEST";

    bool isAnon = _currentUser.isAnonymous;

    return Scaffold(
      backgroundColor: theme.background,
      appBar: AppBar(
        title: Text("PROFILO GIOCATORE", style: getSharedTextStyle(themeType, TextStyle(color: themeType == AppThemeType.doodle ? inkColor : theme.text, fontWeight: FontWeight.w900, letterSpacing: 1.5))),
        backgroundColor: Colors.transparent,
        elevation: 0,
        iconTheme: IconThemeData(color: themeType == AppThemeType.doodle ? inkColor : theme.text),
      ),
      body: Stack(
        children: [
          if (themeType == AppThemeType.doodle)
            Positioned.fill(child: CustomPaint(painter: FullScreenGridPainter(Colors.blue.withOpacity(0.15)))),

          SingleChildScrollView(
            physics: const BouncingScrollPhysics(),
            padding: const EdgeInsets.all(20),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.stretch,
              children: [
                // --- SEZIONE 1: IDENTITÀ ---
                Container(
                  padding: const EdgeInsets.all(20),
                  decoration: BoxDecoration(
                    color: themeType == AppThemeType.doodle ? Colors.white : theme.text.withOpacity(0.05),
                    borderRadius: BorderRadius.circular(20),
                    border: Border.all(color: themeType == AppThemeType.doodle ? inkColor : theme.playerBlue.withOpacity(0.3), width: 2),
                    boxShadow: themeType == AppThemeType.doodle ? [BoxShadow(color: inkColor.withOpacity(0.8), offset: const Offset(4, 4))] : [],
                  ),
                  child: Column(
                    children: [
                      CircleAvatar(radius: 40, backgroundColor: theme.playerBlue.withOpacity(0.2), child: Icon(Icons.person, size: 45, color: theme.playerBlue)),
                      const SizedBox(height: 15),
                      Text(playerName, style: getSharedTextStyle(themeType, TextStyle(fontSize: 28, fontWeight: FontWeight.w900, color: themeType == AppThemeType.doodle ? inkColor : theme.text))),
                      const SizedBox(height: 5),
                      Text(title, style: getSharedTextStyle(themeType, TextStyle(fontSize: 14, fontWeight: FontWeight.bold, color: theme.playerRed))),
                      const SizedBox(height: 15),
                      Row(
                        mainAxisAlignment: MainAxisAlignment.center,
                        children: [
                          Icon(isAnon ? Icons.warning_amber_rounded : Icons.verified_user, color: isAnon ? Colors.orange : Colors.green, size: 18),
                          const SizedBox(width: 5),
                          Text(isAnon ? "Account non protetto" : "Account protetto sul Cloud", style: getSharedTextStyle(themeType, TextStyle(color: isAnon ? Colors.orange : Colors.green, fontWeight: FontWeight.bold, fontSize: 12))),
                        ],
                      )
                    ],
                  ),
                ),
                const SizedBox(height: 20),

                // --- SEZIONE 2: STATISTICHE AVANZATE ---
                Row(
                  children: [
                    Expanded(child: _buildStatCard("Vittorie", "$wins", Icons.emoji_events, Colors.amber, theme, themeType)),
                    const SizedBox(width: 15),
                    Expanded(child: _buildStatCard("Sconfitte", "$losses", Icons.sentiment_very_dissatisfied, theme.playerRed, theme, themeType)),
                  ],
                ),
                const SizedBox(height: 15),
                _buildStatCard("Win Rate Globale", "${winRate.toStringAsFixed(1)}%", Icons.pie_chart, theme.playerBlue, theme, themeType, isWide: true),
                const SizedBox(height: 25),

                // --- SEZIONE 3: REGISTRAZIONE (Solo se anonimo) ---
                if (isAnon) ...[
                  Container(
                    padding: const EdgeInsets.all(20),
                    decoration: BoxDecoration(
                      color: Colors.orange.withOpacity(0.1),
                      borderRadius: BorderRadius.circular(20),
                      border: Border.all(color: Colors.orange, width: 2),
                    ),
                    child: Column(
                      crossAxisAlignment: CrossAxisAlignment.stretch,
                      children: [
                        Text("Metti al sicuro i tuoi progressi!", textAlign: TextAlign.center, style: getSharedTextStyle(themeType, TextStyle(color: themeType == AppThemeType.doodle ? inkColor : Colors.white, fontWeight: FontWeight.bold, fontSize: 16))),
                        const SizedBox(height: 15),
                        TextField(
                          controller: _nameController, textCapitalization: TextCapitalization.characters, textAlign: TextAlign.center, maxLength: 8,
                          style: getSharedTextStyle(themeType, TextStyle(color: themeType == AppThemeType.doodle ? inkColor : Colors.white, fontSize: 20, fontWeight: FontWeight.bold)),
                          decoration: InputDecoration(hintText: "Scegli un Nome", hintStyle: TextStyle(color: Colors.grey.withOpacity(0.6)), filled: true, fillColor: Colors.black12, counterText: "", border: OutlineInputBorder(borderRadius: BorderRadius.circular(15), borderSide: BorderSide.none)),
                        ),
                        const SizedBox(height: 10),
                        TextField(
                          controller: _passController, obscureText: _obscurePassword, textAlign: TextAlign.center, maxLength: 20,
                          style: getSharedTextStyle(themeType, TextStyle(color: themeType == AppThemeType.doodle ? inkColor : Colors.white, fontSize: 20, fontWeight: FontWeight.bold)),
                          decoration: InputDecoration(
                            hintText: "Scegli Password", hintStyle: TextStyle(color: Colors.grey.withOpacity(0.6)), filled: true, fillColor: Colors.black12, counterText: "", border: OutlineInputBorder(borderRadius: BorderRadius.circular(15), borderSide: BorderSide.none),
                            suffixIcon: IconButton(icon: Icon(_obscurePassword ? Icons.visibility : Icons.visibility_off, color: Colors.grey), onPressed: () => setState(() => _obscurePassword = !_obscurePassword)),
                          ),
                        ),
                        if (_errorMessage.isNotEmpty) ...[
                          const SizedBox(height: 10),
                          Text(_errorMessage, textAlign: TextAlign.center, style: const TextStyle(color: Colors.redAccent, fontWeight: FontWeight.bold)),
                        ],
                        if (_nameSuggestions.isNotEmpty) ...[
                          const SizedBox(height: 10),
                          Wrap(
                            spacing: 8, alignment: WrapAlignment.center,
                            children: _nameSuggestions.map((s) => ActionChip(
                              label: Text(s, style: const TextStyle(fontWeight: FontWeight.bold)),
                              backgroundColor: theme.playerBlue.withOpacity(0.2),
                              side: BorderSide(color: theme.playerBlue),
                              onPressed: () { _nameController.text = s; _handleRegistration(); },
                            )).toList(),
                          )
                        ],
                        const SizedBox(height: 15),
                        _isLoading
                            ? const Center(child: CircularProgressIndicator(color: Colors.orange))
                            : ElevatedButton(
                          style: ElevatedButton.styleFrom(backgroundColor: Colors.orange, foregroundColor: Colors.white, padding: const EdgeInsets.symmetric(vertical: 15), shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(15))),
                          onPressed: _handleRegistration,
                          child: Text("SALVA PROFILO", style: getSharedTextStyle(themeType, const TextStyle(fontWeight: FontWeight.w900, letterSpacing: 1.5))),
                        )
                      ],
                    ),
                  ),
                  const SizedBox(height: 25),
                ],

                // --- SEZIONE 4: IMPOSTAZIONI PRIVACY ---
                Text("PRIVACY", style: getSharedTextStyle(themeType, TextStyle(fontSize: 14, fontWeight: FontWeight.w900, color: themeType == AppThemeType.doodle ? inkColor.withOpacity(0.6) : theme.text.withOpacity(0.5), letterSpacing: 1.5))),
                const SizedBox(height: 10),
                SwitchListTile(
                  contentPadding: EdgeInsets.zero,
                  activeColor: theme.playerBlue,
                  title: Text("Modalità Fantasma", style: getSharedTextStyle(themeType, TextStyle(color: themeType == AppThemeType.doodle ? inkColor : theme.text, fontWeight: FontWeight.bold))),
                  subtitle: Text("Nessuno ti vedrà online o potrà invitarti.", style: TextStyle(color: themeType == AppThemeType.doodle ? inkColor.withOpacity(0.6) : theme.text.withOpacity(0.5), fontSize: 12)),
                  value: _isGhostMode,
                  onChanged: _toggleGhostMode,
                ),
                const Divider(),

                // --- SEZIONE 5: GESTIONE PREFERITI ---
                const SizedBox(height: 15),
                Text("AMICI PREFERITI", style: getSharedTextStyle(themeType, TextStyle(fontSize: 14, fontWeight: FontWeight.w900, color: themeType == AppThemeType.doodle ? inkColor.withOpacity(0.6) : theme.text.withOpacity(0.5), letterSpacing: 1.5))),
                const SizedBox(height: 10),
                _buildFavoritesList(theme, themeType, inkColor),

                const SizedBox(height: 40),

                // --- SEZIONE 6: DANGER ZONE ---
                OutlinedButton.icon(
                  style: OutlinedButton.styleFrom(
                    foregroundColor: Colors.redAccent,
                    side: const BorderSide(color: Colors.redAccent, width: 2),
                    padding: const EdgeInsets.symmetric(vertical: 15),
                    shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(15)),
                  ),
                  icon: const Icon(Icons.delete_forever),
                  label: Text("ELIMINA PROFILO", style: getSharedTextStyle(themeType, const TextStyle(fontWeight: FontWeight.w900, letterSpacing: 1.5))),
                  onPressed: _deleteAccount,
                ),
                const SizedBox(height: 30),
              ],
            ),
          ),

          if (_isLoading && !isAnon)
            Positioned.fill(child: Container(color: Colors.black54, child: const Center(child: CircularProgressIndicator(color: Colors.redAccent)))),
        ],
      ),
    );
  }

  Widget _buildStatCard(String title, String value, IconData icon, Color color, ThemeColors theme, AppThemeType themeType, {bool isWide = false}) {
    Color inkColor = const Color(0xFF111122);
    return Container(
      padding: const EdgeInsets.all(15),
      decoration: BoxDecoration(
        color: themeType == AppThemeType.doodle ? Colors.white : theme.text.withOpacity(0.05),
        borderRadius: BorderRadius.circular(15),
        border: Border.all(color: themeType == AppThemeType.doodle ? inkColor : color.withOpacity(0.3), width: 1.5),
        boxShadow: themeType == AppThemeType.doodle ? [BoxShadow(color: inkColor.withOpacity(0.8), offset: const Offset(3, 3))] : [],
      ),
      child: Column(
        crossAxisAlignment: isWide ? CrossAxisAlignment.center : CrossAxisAlignment.start,
        children: [
          Row(
            mainAxisSize: MainAxisSize.min,
            children: [
              Icon(icon, color: color, size: 20),
              const SizedBox(width: 8),
              Text(title, style: getSharedTextStyle(themeType, TextStyle(color: themeType == AppThemeType.doodle ? inkColor.withOpacity(0.6) : theme.text.withOpacity(0.6), fontSize: 11, fontWeight: FontWeight.bold))),
            ],
          ),
          const SizedBox(height: 10),
          Center(
            child: Text(value, style: getSharedTextStyle(themeType, TextStyle(fontSize: 24, fontWeight: FontWeight.w900, color: themeType == AppThemeType.doodle ? inkColor : theme.text))),
          ),
        ],
      ),
    );
  }

  Widget _buildFavoritesList(ThemeColors theme, AppThemeType themeType, Color inkColor) {
    final favs = StorageService.instance.favorites;

    if (favs.isEmpty) {
      return Container(
        padding: const EdgeInsets.all(20),
        decoration: BoxDecoration(borderRadius: BorderRadius.circular(15), border: Border.all(color: Colors.grey.withOpacity(0.3), style: BorderStyle.solid)),
        child: Center(child: Text("Nessun amico salvato.", style: TextStyle(color: themeType == AppThemeType.doodle ? inkColor.withOpacity(0.5) : theme.text.withOpacity(0.5)))),
      );
    }

    return ListView.builder(
      shrinkWrap: true,
      physics: const NeverScrollableScrollPhysics(),
      itemCount: favs.length,
      itemBuilder: (ctx, i) {
        return Container(
          margin: const EdgeInsets.only(bottom: 8),
          decoration: BoxDecoration(
            color: themeType == AppThemeType.doodle ? Colors.white : theme.text.withOpacity(0.02),
            borderRadius: BorderRadius.circular(12),
            border: Border.all(color: themeType == AppThemeType.doodle ? inkColor.withOpacity(0.2) : theme.text.withOpacity(0.1)),
          ),
          child: ListTile(
            leading: Icon(Icons.star, color: Colors.amber.shade600),
            title: Text(favs[i]['name']!, style: getSharedTextStyle(themeType, TextStyle(color: themeType == AppThemeType.doodle ? inkColor : theme.text, fontWeight: FontWeight.bold))),
            trailing: IconButton(
              icon: const Icon(Icons.close, color: Colors.redAccent),
              onPressed: () async {
                await StorageService.instance.toggleFavorite(favs[i]['uid']!, favs[i]['name']!);
                setState(() {});
              },
            ),
          ),
        );
      },
    );
  }
}

class FullScreenGridPainter extends CustomPainter {
  final Color gridColor;
  FullScreenGridPainter(this.gridColor);

  @override
  void paint(Canvas canvas, Size size) {
    final Paint paperGridPaint = Paint()..color = gridColor..strokeWidth = 1.0..style = PaintingStyle.stroke;
    double paperStep = 20.0;
    for (double i = 0; i <= size.width; i += paperStep) canvas.drawLine(Offset(i, 0), Offset(i, size.height), paperGridPaint);
    for (double i = 0; i <= size.height; i += paperStep) canvas.drawLine(Offset(0, i), Offset(size.width, i), paperGridPaint);
  }
  @override bool shouldRepaint(covariant CustomPainter oldDelegate) => false;
}