import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
import '../../core/theme/app_theme.dart';
import '../../core/constants/app_constants.dart';
import '../../services/firebase_service.dart';
import '../../services/dialog_service.dart';

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

  @override
  State<NotificationSettingsScreen> createState() =>
      _NotificationSettingsScreenState();
}

class _NotificationSettingsScreenState
    extends State<NotificationSettingsScreen> {
  static const _keyMain = 'notif_main';
  static const _keyRekomendasi = 'notif_rekomendasi';
  static const _keyCheckin = 'notif_checkin';
  static const _keyPromo = 'notif_promo';

  bool _mainEnabled = true;
  bool _rekomendasiEnabled = true;
  bool _checkinEnabled = true;
  bool _promoEnabled = false;
  bool _isLoading = true;
  bool _isSaving = false;

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

  Future<void> _loadSettings() async {
    final prefs = await SharedPreferences.getInstance();
    setState(() {
      _mainEnabled = prefs.getBool(_keyMain) ?? true;
      _rekomendasiEnabled = prefs.getBool(_keyRekomendasi) ?? true;
      _checkinEnabled = prefs.getBool(_keyCheckin) ?? true;
      _promoEnabled = prefs.getBool(_keyPromo) ?? false;
      _isLoading = false;
    });
  }

  Future<void> _setMain(bool value) async {
    setState(() => _isSaving = true);
    try {
      final prefs = await SharedPreferences.getInstance();
      await prefs.setBool(_keyMain, value);

      final firebaseService = FirebaseService();
      final uid = firebaseService.currentUser?.uid;
      if (uid != null) {
        final userData = await firebaseService.getUserData(uid);
        if (userData != null) {
          await firebaseService.updateUserData(
            userData.copyWith(
              preferences: userData.preferences.copyWith(
                enableNotifications: value,
              ),
            ),
          );
        }
      }
      if (value) await firebaseService.initializeNotifications();

      setState(() => _mainEnabled = value);
    } catch (e) {
      DialogService().showError('Gagal menyimpan: $e');
    } finally {
      if (mounted) setState(() => _isSaving = false);
    }
  }

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: AppTheme.warmWhite,
      appBar: AppBar(
        title: const Text(
          'Pengaturan Notifikasi',
          style: TextStyle(
            color: AppTheme.primaryBrown,
            fontWeight: FontWeight.bold,
          ),
        ),
        backgroundColor: AppTheme.warmWhite,
        elevation: 0,
        iconTheme: const IconThemeData(color: AppTheme.primaryBrown),
      ),
      body: _isLoading
          ? const Center(
              child: CircularProgressIndicator(color: AppTheme.primaryBrown),
            )
          : SingleChildScrollView(
              padding: const EdgeInsets.all(AppConstants.defaultPadding),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  // Notifikasi utama
                  _buildSwitchCard(
                    icon: Icons.notifications_outlined,
                    title: 'Aktifkan Notifikasi',
                    subtitle:
                        'Izinkan MuningAI mengirim notifikasi ke perangkatmu',
                    value: _mainEnabled,
                    onChanged: _isSaving ? null : _setMain,
                  ),

                  const SizedBox(height: 8),

                  // Jenis notifikasi
                  _buildSwitchCard(
                    icon: Icons.restaurant_menu_outlined,
                    title: 'Rekomendasi Menu',
                    subtitle:
                        'Notifikasi saat ada rekomendasi menu baru untukmu',
                    value: _mainEnabled && _rekomendasiEnabled,
                    onChanged: _mainEnabled
                        ? (v) => _toggle(
                            _keyRekomendasi,
                            v,
                            (val) => _rekomendasiEnabled = val,
                          )
                        : null,
                  ),

                  const SizedBox(height: 8),

                  _buildSwitchCard(
                    icon: Icons.today_outlined,
                    title: 'Reminder Check-in',
                    subtitle: 'Pengingat harian untuk mengisi check-in mood',
                    value: _mainEnabled && _checkinEnabled,
                    onChanged: _mainEnabled
                        ? (v) => _toggle(
                            _keyCheckin,
                            v,
                            (val) => _checkinEnabled = val,
                          )
                        : null,
                  ),

                  const SizedBox(height: 8),

                  _buildSwitchCard(
                    icon: Icons.local_offer_outlined,
                    title: 'Promo & Penawaran',
                    subtitle: 'Info promo dan menu spesial dari kafe',
                    value: _mainEnabled && _promoEnabled,
                    onChanged: _mainEnabled
                        ? (v) => _toggle(
                            _keyPromo,
                            v,
                            (val) => _promoEnabled = val,
                          )
                        : null,
                  ),

                  const SizedBox(height: 16),

                  Center(
                    child: Text(
                      'Kamu juga dapat mengatur izin notifikasi\nmelalui Pengaturan perangkatmu.',
                      textAlign: TextAlign.center,
                      style: TextStyle(fontSize: 12, color: AppTheme.grey500),
                    ),
                  ),
                ],
              ),
            ),
    );
  }

  Widget _buildSwitchCard({
    required IconData icon,
    required String title,
    required String subtitle,
    required bool value,
    required ValueChanged<bool>? onChanged,
  }) {
    final active = onChanged != null;
    return Container(
      decoration: BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.circular(AppConstants.borderRadius),
        boxShadow: [
          BoxShadow(
            color: Colors.black.withOpacity(0.03),
            blurRadius: 8,
            offset: const Offset(0, 2),
          ),
        ],
      ),
      child: SwitchListTile(
        contentPadding: const EdgeInsets.symmetric(horizontal: 16, vertical: 4),
        secondary: Container(
          padding: const EdgeInsets.all(8),
          decoration: BoxDecoration(
            color: AppTheme.primaryBrown.withOpacity(active ? 0.1 : 0.04),
            borderRadius: BorderRadius.circular(8),
          ),
          child: Icon(
            icon,
            color: active ? AppTheme.primaryBrown : AppTheme.grey300,
            size: 20,
          ),
        ),
        title: Text(
          title,
          style: TextStyle(
            fontWeight: FontWeight.w600,
            fontSize: 14,
            color: active ? const Color(0xFF424242) : AppTheme.grey400,
          ),
        ),
        subtitle: Text(
          subtitle,
          style: TextStyle(
            fontSize: 12,
            color: active ? AppTheme.grey600 : AppTheme.grey300,
          ),
        ),
        value: value,
        onChanged: onChanged,
        activeColor: AppTheme.primaryBrown,
      ),
    );
  }
}