Migrate to singbox

lib/domain/connectivity/connection_failure.dart

@@ -0,0 +1,40 @@
+import 'package:freezed_annotation/freezed_annotation.dart';
+import 'package:hiddify/core/locale/locale.dart';
+import 'package:hiddify/domain/core_service_failure.dart';
+import 'package:hiddify/domain/failures.dart';
+
+part 'connection_failure.freezed.dart';
+
+@freezed
+sealed class ConnectionFailure with _$ConnectionFailure, Failure {
+  const ConnectionFailure._();
+
+  const factory ConnectionFailure.unexpected([
+    Object? error,
+    StackTrace? stackTrace,
+  ]) = UnexpectedConnectionFailure;
+
+  const factory ConnectionFailure.missingVpnPermission([String? message]) =
+      MissingVpnPermission;
+
+  const factory ConnectionFailure.missingNotificationPermission([
+    String? message,
+  ]) = MissingNotificationPermission;
+
+  const factory ConnectionFailure.core(CoreServiceFailure failure) =
+      CoreConnectionFailure;
+
+  @override
+  String present(TranslationsEn t) {
+    return switch (this) {
+      UnexpectedConnectionFailure() => t.failure.connectivity.unexpected,
+      MissingVpnPermission(:final message) =>
+        t.failure.connectivity.missingVpnPermission +
+            (message == null ? "" : ": $message"),
+      MissingNotificationPermission(:final message) =>
+        t.failure.connectivity.missingNotificationPermission +
+            (message == null ? "" : ": $message"),
+      CoreConnectionFailure(:final failure) => failure.present(t),
+    };
+  }
+}