From 1baaa1c365ac91939a1a2c5051254818851f6856 Mon Sep 17 00:00:00 2001
From: Coxxs <58-coxxs@users.noreply.git.ryujinx.app>
Date: Wed, 12 Nov 2025 08:23:05 -0600
Subject: [PATCH] Preserve and rename the configuration file when it is deemed
 invalid (ryubing/ryujinx!216)

See merge request ryubing/ryujinx!216
---
 src/Ryujinx/Program.cs                        |  2 +
 .../Configuration/ConfigurationFileFormat.cs  | 39 +++++++++++++++++++
 .../ConfigurationState.Migration.cs           |  2 +
 3 files changed, 43 insertions(+)

diff --git a/src/Ryujinx/Program.cs b/src/Ryujinx/Program.cs
index 7dcfdb838..abab3daca 100644
--- a/src/Ryujinx/Program.cs
+++ b/src/Ryujinx/Program.cs
@@ -233,6 +233,8 @@ namespace Ryujinx.Ava
                 {
                     Logger.Warning?.PrintMsg(LogClass.Application, $"Failed to load config! Loading the default config instead.\nFailed config location: {ConfigurationPath}");
 
+                    ConfigurationFileFormat.RenameInvalidConfigFile(ConfigurationPath);
+
                     ConfigurationState.Instance.LoadDefault();
                 }
             }
diff --git a/src/Ryujinx/Systems/Configuration/ConfigurationFileFormat.cs b/src/Ryujinx/Systems/Configuration/ConfigurationFileFormat.cs
index 98a8aba27..f0fafb4e0 100644
--- a/src/Ryujinx/Systems/Configuration/ConfigurationFileFormat.cs
+++ b/src/Ryujinx/Systems/Configuration/ConfigurationFileFormat.cs
@@ -6,7 +6,9 @@ using Ryujinx.Common.Configuration.Multiplayer;
 using Ryujinx.Common.Logging;
 using Ryujinx.Common.Utilities;
 using Ryujinx.HLE;
+using System;
 using System.Collections.Generic;
+using System.IO;
 
 namespace Ryujinx.Ava.Systems.Configuration
 {
@@ -510,6 +512,43 @@ namespace Ryujinx.Ava.Systems.Configuration
             }
         }
 
+        /// <summary>
+        /// Renames the configuration file when it is deemed invalid
+        /// </summary>
+        /// <param name="path">The path to the invalid JSON configuration file</param>
+        /// <returns>The path of the renamed invalid JSON configuration file, or null if the rename failed</returns>
+        public static string RenameInvalidConfigFile(string path)
+        {
+            if (string.IsNullOrWhiteSpace(path) || !File.Exists(path))
+            {
+                return null;
+            }
+
+            try
+            {
+                string directory = Path.GetDirectoryName(path) ?? string.Empty;
+                string originalFileName = Path.GetFileName(path);
+                if (string.IsNullOrWhiteSpace(originalFileName))
+                {
+                    return null;
+                }
+                string renamedFileName = $"{originalFileName}.{DateTime.Now:yyyy-MM-dd_HH-mm-ss}.invalid";
+                string renamedPath = string.IsNullOrEmpty(directory) ? renamedFileName : Path.Combine(directory, renamedFileName);
+
+                File.Move(path, renamedPath, overwrite: false);
+
+                Logger.Warning?.PrintMsg(LogClass.Application, $"Invalid configuration renamed to: {renamedPath}");
+
+                return renamedPath;
+            }
+            catch (Exception ex)
+            {
+                Logger.Error?.PrintMsg(LogClass.Application, $"Failed to rename invalid configuration file \"{path}\": {ex}");
+
+                return null;
+            }
+        }
+
         /// <summary>
         /// Save a configuration file to disk
         /// </summary>
diff --git a/src/Ryujinx/Systems/Configuration/ConfigurationState.Migration.cs b/src/Ryujinx/Systems/Configuration/ConfigurationState.Migration.cs
index a324ec5e6..163b7e98f 100644
--- a/src/Ryujinx/Systems/Configuration/ConfigurationState.Migration.cs
+++ b/src/Ryujinx/Systems/Configuration/ConfigurationState.Migration.cs
@@ -28,6 +28,8 @@ namespace Ryujinx.Ava.Systems.Configuration
             {
                 RyuLogger.Warning?.Print(LogClass.Application, $"Unsupported configuration version {cff.Version}, loading default.");
 
+                ConfigurationFileFormat.RenameInvalidConfigFile(configurationFilePath);
+
                 LoadDefault();
                 return;
             }