fin-tracker/app/lib/core/auth/switch_server.dart

import 'package:flutter_riverpod/flutter_riverpod.dart';

import '../config.dart';
import 'auth_controller.dart';

/// Points the app at [url] (null = the default). A different server means a different
/// account, so the session ends first — while the clients still talk to the OLD server, so
/// the refresh token is revoked there and never sent to the new one — and only then is the
/// address changed. Takes a container rather than a `WidgetRef`: signing out replaces the
/// calling screen, and a disposed widget's `ref` throws.
Future<void> switchApiBaseUrl(ProviderContainer container, String? url) async {
  final next = url ?? defaultApiBaseUrl();
  if (next != container.read(apiBaseUrlProvider)) {
    await container.read(authControllerProvider.notifier).logout();
  }
  await container.read(apiBaseUrlProvider.notifier).save(url);
}