Launch add review through URL route params

lib/app/router/app_router.dart

@@ -5,37 +5,48 @@ import 'package:latlong2/latlong.dart';
 import '../../features/mapflow/presentation/admin_voice_experiences_screen.dart';
 import '../../features/mapflow/presentation/mapflow_shell.dart';
 
-class AddExperienceArgs {
-  const AddExperienceArgs({
-    required this.coordinate,
-    required this.hasTelegramAuth,
-  });
+class MapflowRoutes {
+  const MapflowRoutes._();
 
-  final LatLng? coordinate;
-  final bool hasTelegramAuth;
+  static const home = '/';
+  static const addExperience = '/experience/new';
+  static const adminReviews = '/admin/reviews';
+
+  static String addExperienceLocation({
+    required LatLng? coordinate,
+    required bool hasTelegramAuth,
+  }) {
+    return Uri(
+      path: addExperience,
+      queryParameters: {
+        'telegramAuth': hasTelegramAuth ? '1' : '0',
+        if (coordinate != null) ...{
+          'lat': coordinate.latitude.toString(),
+          'lng': coordinate.longitude.toString(),
+        },
+      },
+    ).toString();
+  }
 }
 
 GoRouter createAppRouter() {
   return GoRouter(
     errorBuilder: (context, state) => const MapflowShell(),
     routes: [
-      GoRoute(path: '/', builder: (context, state) => const MapflowShell()),
       GoRoute(
-        path: '/experience/new',
+        path: MapflowRoutes.home,
+        builder: (context, state) => const MapflowShell(),
+      ),
+      GoRoute(
+        path: MapflowRoutes.addExperience,
         pageBuilder: (context, state) {
-          final extra = state.extra;
-          final args = extra is AddExperienceArgs
-              ? extra
-              : const AddExperienceArgs(
-                  coordinate: null,
-                  hasTelegramAuth: true,
-                );
+          final queryParameters = state.uri.queryParameters;
           return CustomTransitionPage<void>(
             fullscreenDialog: true,
             key: state.pageKey,
             child: AddExperienceFlow(
-              coordinate: args.coordinate,
-              hasTelegramAuth: args.hasTelegramAuth,
+              coordinate: _coordinateFromQuery(queryParameters),
+              hasTelegramAuth: queryParameters['telegramAuth'] != '0',
             ),
             transitionsBuilder: (context, animation, _, child) {
               return SlideTransition(
@@ -50,9 +61,28 @@ GoRouter createAppRouter() {
         },
       ),
       GoRoute(
-        path: '/admin/reviews',
+        path: MapflowRoutes.adminReviews,
         builder: (context, state) => const AdminVoiceExperiencesScreen(),
       ),
     ],
   );
 }
+
+LatLng? _coordinateFromQuery(Map<String, String> queryParameters) {
+  final lat = queryParameters['lat'];
+  final lng = queryParameters['lng'];
+  if (lat == null && lng == null) {
+    return null;
+  }
+  if (lat == null || lng == null) {
+    throw StateError('Both lat and lng query parameters are required.');
+  }
+
+  final latitude = double.parse(lat);
+  final longitude = double.parse(lng);
+  if (!latitude.isFinite || !longitude.isFinite) {
+    throw StateError('Review coordinate query parameters must be finite.');
+  }
+
+  return LatLng(latitude, longitude);
+}

lib/features/mapflow/presentation/mapflow_shell.dart

@@ -165,8 +165,7 @@ class _MapContent extends StatelessWidget {
 
   void _openAddFlow(BuildContext context, LatLng? coordinate) {
     context.push(
-      '/experience/new',
-      extra: AddExperienceArgs(
+      MapflowRoutes.addExperienceLocation(
         coordinate: coordinate,
         hasTelegramAuth: state.hasTelegramAuth,
       ),