import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';

class ThemeService extends ChangeNotifier {
  ThemeMode _themeMode = ThemeMode.light;
  ThemeMode get themeMode => _themeMode;
  bool get isDark => _themeMode == ThemeMode.dark;

  ThemeService() { _load(); }

  Future<void> _load() async {
    final p = await SharedPreferences.getInstance();
    final isDark = p.getBool('dark_mode') ?? false;
    _themeMode = isDark ? ThemeMode.dark : ThemeMode.light;
    notifyListeners();
  }

  Future<void> toggle() async {
    _themeMode = _themeMode == ThemeMode.dark ? ThemeMode.light : ThemeMode.dark;
    final p = await SharedPreferences.getInstance();
    await p.setBool('dark_mode', _themeMode == ThemeMode.dark);
    notifyListeners();
  }
}