fix : refresh token Completer in app_interceptor

packages/core/lib/infrastructure/remote/app_interceptor.dart

@@ -4,33 +4,28 @@ import '../../core.dart';
 typedef RefreshTokenCallback = Future<String?> Function();
 class AppInterceptor extends Interceptor {
   final RefreshTokenCallback refreshTokenCallback;
+  Completer<String?>? _refreshCompleter;
 
   AppInterceptor({required this.refreshTokenCallback});
 
+
   @override
   Future<void> onError(DioException err, ErrorInterceptorHandler handler) async {
     if (err.response?.statusCode == 401 && !ApiHandler.isRefreshing) {
-
       ApiHandler.cancelAllRequests("Token expired - refreshing");
 
+      if (_refreshCompleter == null) {
+        _refreshCompleter = Completer<String?>();
         ApiHandler.isRefreshing = true;
 
         try {
           final newToken = await refreshTokenCallback();
           if (newToken == null) throw Exception("Refresh failed");
 
-
           ApiHandler.reset();
-
+          _refreshCompleter?.complete(newToken);
-        final opts = err.requestOptions;
-        opts.headers['Authorization'] = 'Bearer $newToken';
-
-
-        final dio = Dio();
-        final cloneReq = await dio.fetch(opts);
-        handler.resolve(cloneReq);
-        return;
         } catch (e) {
+          _refreshCompleter?.completeError(e);
           if (!ApiHandler.isRedirecting) {
             ApiHandler.isRedirecting = true;
             ApiHandler.cancelAllRequests("Cancel All Requests - Unauthorized");
@@ -38,12 +33,27 @@ class AppInterceptor extends Interceptor {
               Get.offAllNamed('/Auth');
             }
           }
-        handler.reject(err);
         } finally {
           ApiHandler.isRefreshing = false;
+          _refreshCompleter = null;
+        }
+      }
+
+      try {
+        final newToken = await _refreshCompleter!.future;
+        if (newToken != null) {
+          final opts = err.requestOptions;
+          opts.headers['Authorization'] = 'Bearer $newToken';
+
+          final dio = Dio();
+          final cloneReq = await dio.fetch(opts);
+          handler.resolve(cloneReq);
+          return;
+        }
+      } catch (_) {
+        handler.reject(err);
       }
     } else if (err.type == DioExceptionType.cancel) {
-
       handler.next(err);
     } else {
       handler.next(err);