FabledApp/lib/providers/settings_provider.dart

import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:shared_preferences/shared_preferences.dart';

const _kServerUrl = 'server_url';

final sharedPreferencesProvider = Provider<SharedPreferences>((ref) {
  throw UnimplementedError('Override in ProviderScope');
});

final cookiesPathProvider = Provider<String>((ref) {
  throw UnimplementedError('Override in ProviderScope');
});

final serverUrlProvider = StateNotifierProvider<ServerUrlNotifier, String?>((ref) {
  final prefs = ref.watch(sharedPreferencesProvider);
  return ServerUrlNotifier(prefs);
});

class ServerUrlNotifier extends StateNotifier<String?> {
  final SharedPreferences _prefs;

  ServerUrlNotifier(this._prefs) : super(_prefs.getString(_kServerUrl));

  Future<void> setUrl(String url) async {
    // Strip trailing slash
    final clean = url.endsWith('/') ? url.substring(0, url.length - 1) : url;
    await _prefs.setString(_kServerUrl, clean);
    state = clean;
  }

  Future<void> clear() async {
    await _prefs.remove(_kServerUrl);
    state = null;
  }
}