import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:provider/provider.dart';
import 'package:google_fonts/google_fonts.dart';
import 'package:url_launcher/url_launcher.dart';
import 'package:share_plus/share_plus.dart';
import 'package:kzeduca_app/services/i18n_service.dart';
import 'package:kzeduca_app/screens/privacy_policy_screen.dart'; // Importa a nova tela

// KzEduca Palette
const _kGradientStart = Color(0xFF512DA8); // Roxo vibrante
const _kGradientEnd = Color(0xFF000000); // Preto profundo
const _kAccent = Color(0xFF00BFA5); // Verde água
const _kAction = Color(0xFFFFD600); // Amarelo/dourado
const _kCardColor = Color(0xFF1E1E1E); // Cinza escuro para cards

class SettingsScreen extends StatefulWidget {
  final Function(Locale)? onLocaleChanged;
  final Function(String) onCurrencyChanged;

  const SettingsScreen({
    super.key,
    this.onLocaleChanged,
    required this.onCurrencyChanged,
  });

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

class _SettingsScreenState extends State<SettingsScreen> {
  String _selectedLanguage = 'pt';
  String _selectedCurrency = 'KZ';


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

  Future<void> _loadSettings() async {
    final prefs = await SharedPreferences.getInstance();
    final i18n = Provider.of<I18nService>(context, listen: false);
    setState(() {
      _selectedLanguage =
          prefs.getString('languageCode') ?? i18n.locale.languageCode;
      _selectedCurrency = prefs.getString('currencySymbol') ?? 'KZ';
    });
  }

  Future<void> _saveLanguage(String languageCode) async {
    final i18n = Provider.of<I18nService>(context, listen: false);
    await i18n.setLocale(Locale(languageCode));
    setState(() {
      _selectedLanguage = languageCode;
    });
  }

  Future<void> _saveCurrency(String currencySymbol) async {
    final prefs = await SharedPreferences.getInstance();
    await prefs.setString('currencySymbol', currencySymbol);
    setState(() {
      _selectedCurrency = currencySymbol;
    });
    widget.onCurrencyChanged(currencySymbol);
  }

  Future<void> _launchUrl(Uri url) async {
    if (!await launchUrl(url, mode: LaunchMode.externalApplication)) {
      throw 'Não foi possível abrir o link: $url';
    }
  }

  void _rateApp() {
    final i18n = Provider.of<I18nService>(context, listen: false);
    final isAndroid = Theme.of(context).platform == TargetPlatform.android;
    final url = isAndroid
        ? 'market://details?id=com.kzeduca.app'
        : 'https://apps.apple.com/app/idYOUR_APPLE_ID';

    try {
      _launchUrl(Uri.parse(url));
    } catch (e) {
      _showErrorDialog(i18n.t('rate_app_error'), 'Erro: $e');
    }
  }

  void _sendFeedback() {
    final i18n = Provider.of<I18nService>(context, listen: false);
    final Uri emailLaunchUri = Uri(
      scheme: 'mailto',
      path: 'kzeducaapp@gmail.com', // E-mail de suporte da sua aplicação
      query: encodeQueryParameters(<String, String>{
        'subject': i18n.t('feedback_email_subject'),
        'body': i18n.t('feedback_email_body'),
      }),
    );

    try {
      _launchUrl(emailLaunchUri);
    } catch (e) {
      _showErrorDialog(i18n.t('send_feedback_error'), 'Erro: $e');
    }
  }

  void _shareApp() {
    final i18n = Provider.of<I18nService>(context, listen: false);
    final String message = i18n.t('share_message');
    Share.share(message);
  }

  void _showPrivacyPolicy() {
    Navigator.push(
      context,
      MaterialPageRoute(builder: (context) => const PrivacyPolicyScreen()),
    );
  }

  void _showErrorDialog(String title, String message) {
    showDialog(
      context: context,
      builder: (ctx) => AlertDialog(
        title: Text(title),
        content: Text(message),
        actions: [
          TextButton(
            onPressed: () => Navigator.of(ctx).pop(),
            child: const Text('OK'),
          ),
        ],
      ),
    );
  }

  String? encodeQueryParameters(Map<String, String> params) {
    return params.entries
        .map((e) => '${Uri.encodeComponent(e.key)}=${Uri.encodeComponent(e.value)}')
        .join('&');
  }

  @override
  Widget build(BuildContext context) {
    final i18n = Provider.of<I18nService>(context);

    return Scaffold(
      backgroundColor: Colors.black,
      appBar: AppBar(
        backgroundColor: Colors.transparent,
        elevation: 0,
        leading: IconButton(
          icon: const Icon(Icons.arrow_back_rounded, color: Colors.white, size: 28),
          onPressed: () {
            Navigator.of(context).pop();
          },
        ),
      ),
      body: Container(
        decoration: const BoxDecoration(
          gradient: LinearGradient(
            colors: [_kGradientStart, _kGradientEnd],
            begin: Alignment.topCenter,
            end: Alignment.bottomCenter,
          ),
        ),
        child: SafeArea(
          child: SingleChildScrollView(
            padding: const EdgeInsets.symmetric(horizontal: 24.0),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                const SizedBox(height: 24),
                // Título da Tela
                Text(
                  i18n.t('settings_title'),
                  style: GoogleFonts.montserrat(
                    color: Colors.white,
                    fontSize: 32,
                    fontWeight: FontWeight.w700,
                  ),
                ),
                const SizedBox(height: 32),

                // Seção de Configurações Gerais
                _SectionHeader(title: i18n.t('general_settings')),
                _SettingCard(
                  icon: Icons.language_rounded,
                  title: i18n.t('language'),
                  trailing: _buildLanguageDropdown(i18n),
                ),
                _SettingCard(
                  icon: Icons.currency_exchange_rounded,
                  title: i18n.t('currency'),
                  trailing: _buildCurrencyDropdown(),
                ),

                const SizedBox(height: 32),

                // Seção de Políticas e Feedback
                _SectionHeader(title: i18n.t('policies_and_feedback')),
                _SettingCard(
                  icon: Icons.star_rounded,
                  title: i18n.t('rate_app'),
                  onTap: _rateApp,
                ),
                _SettingCard(
                  icon: Icons.feedback_rounded,
                  title: i18n.t('send_feedback'),
                  onTap: _sendFeedback,
                ),
                _SettingCard(
                  icon: Icons.share_rounded,
                  title: i18n.t('share_with_friends'),
                  onTap: _shareApp,
                ),
                _SettingCard(
                  icon: Icons.policy_rounded,
                  title: i18n.t('privacy_policy'),
                  onTap: _showPrivacyPolicy,
                ),
                const SizedBox(height: 40),
              ],
            ),
          ),
        ),
      ),
    );
  }

  Widget _buildLanguageDropdown(I18nService i18n) {
    return DropdownButton<String>(
      value: _selectedLanguage,
      icon: const Icon(Icons.arrow_drop_down_rounded, color: Colors.white54),
      dropdownColor: _kCardColor,
      underline: const SizedBox(),
      style: GoogleFonts.montserrat(color: _kAccent, fontWeight: FontWeight.w500),
      onChanged: (String? newValue) {
        if (newValue != null) {
          _saveLanguage(newValue);
        }
      },
      items: <DropdownMenuItem<String>>[
        DropdownMenuItem<String>(
          value: 'pt',
          child: Text(i18n.t('portuguese_brazil')),
        ),
        DropdownMenuItem<String>(
          value: 'en',
          child: Text(i18n.t('english')),
        ),
      ],
    );
  }

  Widget _buildCurrencyDropdown() {
    return DropdownButton<String>(
      value: _selectedCurrency,
      icon: const Icon(Icons.arrow_drop_down_rounded, color: Colors.white54),
      dropdownColor: _kCardColor,
      underline: const SizedBox(),
      style: GoogleFonts.montserrat(color: _kAccent, fontWeight: FontWeight.w500),
      onChanged: (String? newValue) {
        if (newValue != null) {
          _saveCurrency(newValue);
        }
      },
      items: const <DropdownMenuItem<String>>[
        DropdownMenuItem<String>(value: 'USD', child: Text('USD')),
        DropdownMenuItem<String>(value: 'EUR', child: Text('EUR')),
        DropdownMenuItem<String>(value: 'KZ', child: Text('KZ')),
      ],
    );
  }
}

class _SectionHeader extends StatelessWidget {
  final String title;
  const _SectionHeader({required this.title});

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 8.0),
      child: Text(
        title,
        style: GoogleFonts.montserrat(
          color: Colors.white70,
          fontSize: 18,
          fontWeight: FontWeight.w600,
        ),
      ),
    );
  }
}

class _SettingCard extends StatelessWidget {
  final IconData icon;
  final String title;
  final Widget? trailing;
  final VoidCallback? onTap;

  const _SettingCard({
    required this.icon,
    required this.title,
    this.trailing,
    this.onTap,
  });

  @override
  Widget build(BuildContext context) {
    return Card(
      color: _kCardColor,
      elevation: 8,
      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
      margin: const EdgeInsets.symmetric(vertical: 8.0),
      child: InkWell(
        onTap: onTap,
        borderRadius: BorderRadius.circular(16),
        splashColor: _kAccent.withOpacity(0.2),
        child: Padding(
          padding: const EdgeInsets.all(16.0),
          child: Row(
            children: [
              Icon(icon, color: _kAccent, size: 28),
              const SizedBox(width: 16),
              Expanded(
                child: Text(
                  title,
                  style: GoogleFonts.montserrat(
                    color: Colors.white,
                    fontSize: 16,
                    fontWeight: FontWeight.w500,
                  ),
                ),
              ),
              if (trailing != null) trailing!,
            ],
          ),
        ),
      ),
    );
  }
}