Utils: Add type json serialization workaround

Signed-off-by: Vasiliy Doylov <nekocwd@mainlining.org>

src/logic/meson.build

@@ -0,0 +1,5 @@
+singularity_sources += [
+  'logic/utils.vala',
+]
+
+singularity_deps += dependency('json-glib-1.0')

src/logic/utils.vala

@@ -0,0 +1,46 @@
+/* utils.vala
+ *
+ * Copyright 2025 Vasiliy Doylov (NekoCWD) <nekocwd@mainlining.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+/*
+ * Collection of ugly workarounds and hacks
+ */
+namespace Singularity.Utils {
+    /*
+     * In vala we can't use `type` as field name, but we need to use it
+     * to make out saves compatible with SingBox configuration.
+     */
+    public void fix_type(ref Json.Node node) {
+        const string TYPE_NAME_SRC = "type-name";
+        const string TYPE_NAME_DST = "type";
+
+        var obj = node.get_object();
+        if (obj.has_member(TYPE_NAME_SRC)) {
+            var type_name = obj.get_member(TYPE_NAME_SRC);
+            obj.set_member(TYPE_NAME_DST, type_name);
+            obj.remove_member(TYPE_NAME_SRC);
+        } else if (obj.has_member(TYPE_NAME_DST)) {
+            var type_name = obj.get_member(TYPE_NAME_DST);
+            obj.set_member(TYPE_NAME_SRC, type_name);
+            obj.remove_member(TYPE_NAME_DST);
+        } else {
+            warning("Object has no type to fix it");
+        }
+    }
+}

src/meson.build

@@ -10,6 +10,8 @@ singularity_deps = [
   dependency('libadwaita-1', version: '>= 1.4'),
 ]
 
+subdir('logic')
+
 blueprints = custom_target(
   'blueprints',
   input: files(