refactor: login page "pops"

Author: lishaduck

Diff for: lib/app/app_router.dart

@@ -16,7 +16,7 @@ part "app_router.gr.dart";
 
 /// The router for the application.
 @AutoRouterConfig(replaceInRouteName: "Page,Route")
-class AppRouter extends _$AppRouter {
+class AppRouter extends _$AppRouter implements AutoRouteGuard {
   /// Create a new instance of [AppRouter].
   AppRouter({required this.ref});
 
@@ -28,20 +28,31 @@ class AppRouter extends _$AppRouter {
     transitionsBuilder: TransitionsBuilders.slideLeftWithFade,
   );
 
+  @override
+  Future<void> onNavigation(
+    NavigationResolver resolver,
+    StackRouter router,
+  ) async {
+    final authState = ref.read(userProvider).valueOrNull;
+
+    if (authState != null || resolver.route.name == AuthRoute.name) {
+      resolver.next(); // continue navigation
+    } else {
+      // else we navigate to the Login page so we get authenticated
+
+      // tip: use resolver.redirect to have the redirected route
+      // automatically removed from the stack when the resolver is completed
+      await resolver.redirect(const AuthRoute()).then(
+            (didLogin) => resolver.next((didLogin ?? false) as bool),
+          );
+    }
+  }
+
   @override
   List<AutoRoute> get routes => [
         AutoRoute(
           page: WrapperRoute.page,
           path: "/",
-          guards: [
-            AutoRouteGuard.redirect(
-              (resolver) {
-                final authState = ref.read(userProvider).valueOrNull;
-
-                return (authState != null) ? null : const AuthRoute();
-              },
-            ),
-          ],
           children: [
             AutoRoute(
               page: PirateCoinsRoute.page,

Diff for: lib/features/auth/presentation/auth_page/auth_page.dart

@@ -11,7 +11,7 @@ import "../../../../l10n/l10n.dart";
 import "../../application/auth_service.dart";
 
 /// The page located at `/login/`.
-@RoutePage()
+@RoutePage<bool>()
 class AuthPage extends ConsumerWidget {
   /// Create a new instance of [AuthPage].
   const AuthPage({super.key});
@@ -38,7 +38,7 @@ class AuthPage extends ConsumerWidget {
                           .authenticate();
 
                       if (context.mounted) {
-                        await context.router.push(const DashboardRoute());
+                        await context.go();
                       }
                     },
                     icon: const Icon(Icons.g_mobiledata),
@@ -52,7 +52,7 @@ class AuthPage extends ConsumerWidget {
                           .anonymous();
 
                       if (context.mounted) {
-                        await context.router.push(const DashboardRoute());
+                        await context.go();
                       }
                     },
                     icon: const Icon(Icons.person),
@@ -67,3 +67,14 @@ class AuthPage extends ConsumerWidget {
     );
   }
 }
+
+extension _Go on BuildContext {
+  Future<void> go() async {
+    // if we were redirected here, go back to the right page.
+    await router.pop<bool>(true);
+    if (mounted) {
+      // otherwise, go to the dashboard.
+      await router.push(const DashboardRoute());
+    }
+  }
+}