Enhanced settings manager with versioned backups and migrations (#819)

app/MindWork AI Studio/Layout/MainLayout.razor.cs

@@ -58,6 +58,7 @@ public partial class MainLayout : LayoutComponentBase, IMessageBusReceiver, ILan
     private MudThemeProvider themeProvider = null!;
     private bool useDarkMode;
     private bool startupCompleted;
+    private bool settingsWriteProtectionWarningShown;
     private readonly SemaphoreSlim mandatoryInfoDialogSemaphore = new(1, 1);
 
     private IReadOnlyCollection<NavBarItem> navItems = [];
@@ -127,6 +128,39 @@ public partial class MainLayout : LayoutComponentBase, IMessageBusReceiver, ILan
 
     #endregion
 
+    private void ShowSettingsWriteProtectionWarning()
+    {
+        if(!this.SettingsManager.SettingsWriteBlocked || this.settingsWriteProtectionWarningShown)
+            return;
+
+        this.settingsWriteProtectionWarningShown = true;
+        var reason = this.SettingsManager.SettingsWriteBlockReason;
+        var message = reason switch
+        {
+            SettingsWriteBlockReason.VERSION_NEWER_THAN_APP => T("Your settings were created by a newer AI Studio version. Changes in this session will not be saved. Please install or start the latest available update."),
+            SettingsWriteBlockReason.VERSION_MISSING => T("Your settings file does not contain a settings-format version. Changes in this session will not be saved to avoid overwriting your settings. Please check for updates or contact support."),
+            SettingsWriteBlockReason.VERSION_UNKNOWN => T("AI Studio does not recognize your settings-format version. Changes in this session will not be saved to avoid overwriting your settings. Please check for updates or contact support."),
+            SettingsWriteBlockReason.FILE_UNREADABLE => T("AI Studio could not read your settings file. Changes in this session will not be saved to avoid overwriting recoverable settings. Please check for updates or contact support."),
+            SettingsWriteBlockReason.CURRENT_VERSION_INVALID => T("AI Studio found the current settings format but could not load it safely. Changes in this session will not be saved. Please check for updates or contact support."),
+            _ => T("AI Studio cannot safely save settings in this session. Please check for updates or contact support."),
+        };
+        message = $"{message} {T("Reason")}: {reason}";
+
+        this.Snackbar.Add(message, Severity.Warning, config =>
+        {
+            config.Icon = Icons.Material.Filled.WarningAmber;
+            config.IconSize = Size.Large;
+            config.VisibleStateDuration = 32_000;
+            config.HideTransitionDuration = 600;
+            config.Action = T("Check for updates");
+            config.ActionVariant = Variant.Filled;
+            config.OnClick = async _ =>
+            {
+                await this.MessageBus.SendMessage<bool>(this, Event.USER_SEARCH_FOR_UPDATE);
+            };
+        });
+    }
+
     #region Implementation of ILang
 
     /// <inheritdoc />
@@ -276,6 +310,7 @@ public partial class MainLayout : LayoutComponentBase, IMessageBusReceiver, ILan
                 case Event.PLUGINS_RELOADED:
                     this.Lang = await this.SettingsManager.GetActiveLanguagePlugin();
                     I18N.Init(this.Lang);
+                    this.ShowSettingsWriteProtectionWarning();
                     this.LoadNavItems();
 
                     await this.InvokeAsync(this.StateHasChanged);