lemmur-app-android/lib/stores/config_store.dart

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

import 'shared_pref_keys.dart';

/// Store managing user-level configuration such as theme or language
class ConfigStore extends ChangeNotifier {
  ThemeMode _theme;
  ThemeMode get theme => _theme;
  set theme(ThemeMode theme) {
    _theme = theme;
    notifyListeners();
    save();
  }

  bool _amoledDarkMode;
  bool get amoledDarkMode => _amoledDarkMode;
  set amoledDarkMode(bool amoledDarkMode) {
    _amoledDarkMode = amoledDarkMode;
    notifyListeners();
    save();
  }

  Future<void> load() async {
    final prefs = await SharedPreferences.getInstance();
    // load saved settings or create defaults
    theme =
        _themeModeFromString(prefs.getString(SharedPrefKeys.theme) ?? 'system');
    amoledDarkMode = prefs.getBool(SharedPrefKeys.amoledDarkMode) ?? false;
    notifyListeners();
  }

  Future<void> save() async {
    final prefs = await SharedPreferences.getInstance();

    await prefs.setString(SharedPrefKeys.theme, describeEnum(theme));
    await prefs.setBool(SharedPrefKeys.amoledDarkMode, amoledDarkMode);
  }
}

/// converts string to ThemeMode
ThemeMode _themeModeFromString(String theme) =>
    ThemeMode.values.firstWhere((e) => describeEnum(e) == theme);