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

class ThemeController extends ChangeNotifier {
  ThemeMode _themeMode = ThemeMode.system;

  ThemeMode get themeMode => _themeMode;

  ThemeController() {
    _loadTheme();
  }

  // Load saved theme from disk
  Future<void> _loadTheme() async {
    final prefs = await SharedPreferences.getInstance();
    final themeIndex = prefs.getInt('theme_mode') ?? 0;
    _themeMode = ThemeMode.values[themeIndex];
    notifyListeners();
  }

  // Update and save theme
  Future<void> updateTheme(ThemeMode? newThemeMode) async {
    if (newThemeMode == null || newThemeMode == _themeMode) return;

    _themeMode = newThemeMode;
    notifyListeners();

    final prefs = await SharedPreferences.getInstance();
    await prefs.setInt('theme_mode', newThemeMode.index);
  }
}