import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:chepuhagram/domain/services/api_service.dart';

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

  @override
  State<PrivacySettingsScreen> createState() => _PrivacySettingsScreenState();
}

class _PrivacySettingsScreenState extends State<PrivacySettingsScreen> {
  static const _showEmailKey = 'privacy_show_email';
  static const _showPhoneKey = 'privacy_show_phone';
  static const _showAvatarKey = 'privacy_show_avatar';
  static const _showAboutKey = 'privacy_show_about';
  static const _showLastOnlineKey = 'privacy_show_last_online';

  bool _showEmail = true;
  bool _showPhone = true;
  bool _showAvatar = true;
  bool _showAbout = true;
  bool _showLastOnline = true;
  bool _isSaving = false;

  @override
  void initState() {
    super.initState();
    _loadPreferences();
    _loadServerSettings();
  }

  Future<void> _loadPreferences() async {
    final prefs = await SharedPreferences.getInstance();
    setState(() {
      _showEmail = prefs.getBool(_showEmailKey) ?? true;
      _showPhone = prefs.getBool(_showPhoneKey) ?? true;
      _showAvatar = prefs.getBool(_showAvatarKey) ?? true;
      _showAbout = prefs.getBool(_showAboutKey) ?? true;
      _showLastOnline = prefs.getBool(_showLastOnlineKey) ?? true;
    });
  }

  Future<void> _loadServerSettings() async {
    try {
      final api = ApiService();
      final data = await api.getPrivacySettings();
      setState(() {
        _showEmail = data['show_email'] ?? true;
        _showPhone = data['show_phone'] ?? true;
        _showAvatar = data['show_avatar'] ?? true;
        _showAbout = data['show_about'] ?? true;
        _showLastOnline = data['show_last_online'] ?? true;
      });
      await _savePreference(_showEmailKey, _showEmail);
      await _savePreference(_showPhoneKey, _showPhone);
      await _savePreference(_showAvatarKey, _showAvatar);
      await _savePreference(_showAboutKey, _showAbout);
      await _savePreference(_showLastOnlineKey, _showLastOnline);
    } catch (e) {
      print('Ошибка загрузки настроек с сервера: $e');
    }
  }

  Future<void> _savePreference(String key, bool value) async {
    final prefs = await SharedPreferences.getInstance();
    await prefs.setBool(key, value);
  }

  Future<void> _saveToServer() async {
    if (_isSaving) return;
    setState(() => _isSaving = true);

    try {
      final api = ApiService();
      final success = await api.updatePrivacySettings(
        showEmail: _showEmail,
        showPhone: _showPhone,
        showAvatar: _showAvatar,
        showAbout: _showAbout,
        showLastOnline: _showLastOnline,
      );

      if (success) {
        await _savePreference(_showEmailKey, _showEmail);
        await _savePreference(_showPhoneKey, _showPhone);
        await _savePreference(_showAvatarKey, _showAvatar);
        await _savePreference(_showAboutKey, _showAbout);
        await _savePreference(_showLastOnlineKey, _showLastOnline);
      }
    } catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('Ошибка: ${e.toString().replaceAll('Exception: ', '')}'), behavior: SnackBarBehavior.floating),
        );
      }
    } finally {
      if (mounted) setState(() => _isSaving = false);
    }
  }

  @override
  Widget build(BuildContext context) {
    final colorScheme = Theme.of(context).colorScheme;

    return WillPopScope(
      onWillPop: () async {
        await _saveToServer();
        return true;
      },
      child: Scaffold(
        backgroundColor: colorScheme.background,
        appBar: AppBar(
          title: Text('Видимость данных', style: TextStyle(fontWeight: FontWeight.bold, color: Theme.of(context).colorScheme.onSurface)),
          elevation: 0,
          backgroundColor: Colors.transparent,
          iconTheme: IconThemeData(color: Theme.of(context).colorScheme.onSurface),
        ),
      body: ListView(
        physics: const BouncingScrollPhysics(),
        padding: const EdgeInsets.all(16),
        children: [
          const Padding(
            padding: EdgeInsets.only(left: 8.0, bottom: 12),
            child: Text('Кто видит мою информацию:', style: TextStyle(fontSize: 14, fontWeight: FontWeight.bold, letterSpacing: 0.5)),
          ),
          Container(
            decoration: BoxDecoration(
              color: colorScheme.surfaceVariant.withOpacity(0.2),
              borderRadius: BorderRadius.circular(24),
              border: Border.all(color: colorScheme.outlineVariant.withOpacity(0.1)),
            ),
            child: Column(
              children: [
                _buildSwitchTile('Показывать почту другим', _showEmail, (v) => setState(() => _showEmail = v)),
                _buildDivider(),
                _buildSwitchTile('Показывать телефон другим', _showPhone, (v) => setState(() => _showPhone = v)),
                _buildDivider(),
                _buildSwitchTile('Показывать аватар другим', _showAvatar, (v) => setState(() => _showAvatar = v)),
                _buildDivider(),
                _buildSwitchTile('Показывать информацию «О себе»', _showAbout, (v) => setState(() => _showAbout = v)),
                _buildDivider(),
                _buildSwitchTile('Показывать последний онлайн', _showLastOnline, (v) => setState(() => _showLastOnline = v)),
              ],
            ),
          ),
          const SizedBox(height: 24),
          Container(
            padding: const EdgeInsets.all(16),
            decoration: BoxDecoration(
              color: colorScheme.primary.withOpacity(0.04),
              borderRadius: BorderRadius.circular(16),
            ),
            child: Row(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Icon(Icons.lock_person_rounded, color: colorScheme.primary, size: 20),
                const SizedBox(width: 12),
                Expanded(
                  child: Text(
                    'Эти настройки напрямую влияют на то, какие персональные данные будут доступны другим участникам в глобальном поиске и карточках чатов.',
                    style: TextStyle(color: colorScheme.outline, fontSize: 13, height: 1.4),
                  ),
                ),
              ],
            ),
          ),
        ],
      ),
    ),
  );
}

  Widget _buildSwitchTile(String title, bool value, ValueChanged<bool> onChanged) {
    return SwitchListTile(
      title: Text(title, style: const TextStyle(fontSize: 15, fontWeight: FontWeight.w500)),
      value: value,
      onChanged: onChanged,
      contentPadding: const EdgeInsets.symmetric(horizontal: 20, vertical: 2),
    );
  }

  Widget _buildDivider() => Divider(height: 1, indent: 20, endIndent: 20, color: Theme.of(context).colorScheme.outlineVariant.withOpacity(0.2));
}