fix(launcher): extract startup subsystem and harden IPC detection

Co-authored-by: Cursor <cursoragent@cursor.com>

LanMountainDesktop.Launcher/Services/LauncherFlowCoordinator.UiPresenter.cs

@@ -0,0 +1,175 @@
+using System.Diagnostics;
+using Avalonia.Threading;
+using LanMountainDesktop.Launcher.Models;
+using LanMountainDesktop.Launcher.Resources;
+using LanMountainDesktop.Launcher.Services.Ipc;
+using LanMountainDesktop.Launcher.Views;
+using LanMountainDesktop.Shared.Contracts.Launcher;
+using LanMountainDesktop.Shared.IPC;
+using LanMountainDesktop.Shared.IPC.Abstractions.Services;
+
+namespace LanMountainDesktop.Launcher.Services;
+
+internal sealed partial class LauncherFlowCoordinator
+{
+    private static async Task CloseWindowsAsync(SplashWindow splashWindow, LoadingDetailsWindow? loadingDetailsWindow)
+    {
+        try
+        {
+            await Dispatcher.UIThread.InvokeAsync(() => splashWindow.DismissAsync());
+        }
+        catch (Exception ex)
+        {
+            Logger.Error("Failed to dismiss splash window.", ex);
+        }
+
+        await Dispatcher.UIThread.InvokeAsync(() =>
+        {
+            try
+            {
+                if (loadingDetailsWindow is not null && loadingDetailsWindow.IsVisible)
+                {
+                    loadingDetailsWindow.Close();
+                }
+            }
+            catch (Exception ex)
+            {
+                Logger.Error("Failed to close loading details window.", ex);
+            }
+        });
+    }
+    private async Task<(ErrorWindowResult Result, string? CustomPath)> ShowHostNotFoundErrorAsync()
+    {
+        ErrorWindow? errorWindow = null;
+
+        await Dispatcher.UIThread.InvokeAsync(() =>
+        {
+            try
+            {
+                errorWindow = new ErrorWindow();
+                errorWindow.ConfigureForHostNotFound();
+                errorWindow.SetErrorMessage("LanMountainDesktop host executable was not found.");
+                errorWindow.Show();
+                Logger.Warn("Host not found. Showing error window.");
+            }
+            catch (Exception ex)
+            {
+                Logger.Error("Failed to show host-not-found error window.", ex);
+            }
+        });
+
+        if (errorWindow is null)
+        {
+            return (ErrorWindowResult.Exit, null);
+        }
+
+        ErrorWindowResult result;
+        string? customPath;
+        try
+        {
+            result = await errorWindow.WaitForChoiceAsync().ConfigureAwait(false);
+            customPath = errorWindow.GetCustomHostPath();
+            Logger.Info($"Host-not-found window result='{result}'; HasCustomPath={!string.IsNullOrWhiteSpace(customPath)}.");
+        }
+        catch (Exception ex)
+        {
+            Logger.Error("Failed while waiting for host-not-found window result.", ex);
+            result = ErrorWindowResult.Exit;
+            customPath = null;
+        }
+
+        await Dispatcher.UIThread.InvokeAsync(() =>
+        {
+            try
+            {
+                if (errorWindow.IsVisible && errorWindow.IsLoaded)
+                {
+                    errorWindow.Close();
+                }
+            }
+            catch (Exception ex)
+            {
+                Logger.Error("Failed to close host-not-found error window.", ex);
+            }
+        });
+
+        return (result, customPath);
+    }
+
+    private async Task<MigrationResult> ShowMigrationPromptAsync(LegacyVersionInfo legacyInfo)
+    {
+        MigrationPromptWindow? migrationWindow = null;
+
+        await Dispatcher.UIThread.InvokeAsync(() =>
+        {
+            try
+            {
+                migrationWindow = new MigrationPromptWindow();
+                migrationWindow.SetLegacyInfo(legacyInfo);
+                migrationWindow.Show();
+            }
+            catch (Exception ex)
+            {
+                Logger.Error("Failed to show migration prompt window.", ex);
+            }
+        });
+
+        if (migrationWindow is null)
+        {
+            return MigrationResult.Skipped;
+        }
+
+        MigrationResult result;
+        try
+        {
+            result = await migrationWindow.WaitForChoiceAsync().ConfigureAwait(false);
+        }
+        catch (Exception ex)
+        {
+            Logger.Error("Failed while waiting for migration prompt result.", ex);
+            result = MigrationResult.Skipped;
+        }
+
+        await Dispatcher.UIThread.InvokeAsync(() =>
+        {
+            try
+            {
+                if (migrationWindow.IsVisible && migrationWindow.IsLoaded)
+                {
+                    migrationWindow.Close();
+                }
+            }
+            catch (Exception ex)
+            {
+                Logger.Error("Failed to close migration prompt window.", ex);
+            }
+        });
+
+        return result;
+    }
+    private static string MapStartupStageToSplashStage(StartupStage stage) => stage switch
+    {
+        StartupStage.Initializing => "initializing",
+        StartupStage.LoadingSettings => "settings",
+        StartupStage.LoadingPlugins => "plugins",
+        StartupStage.TrayReady => "shell",
+        StartupStage.InitializingUI => "ui",
+        StartupStage.ShellInitialized => "shell",
+        StartupStage.BackgroundReady => "ready",
+        StartupStage.DesktopVisible => "ready",
+        StartupStage.ActivationRedirected => "activation",
+        StartupStage.ActivationFailed => "error",
+        StartupStage.Ready => "ready",
+        _ => "launch"
+    };
+    private static async Task<MultiInstancePromptResult> ShowMultiInstancePromptAsync(PublicShellStatus status)
+    {
+        return await Dispatcher.UIThread.InvokeAsync(async () =>
+        {
+            var prompt = new MultiInstancePromptWindow();
+            prompt.SetDetails(status.ProcessId, status.ShellState);
+            prompt.Show();
+            return await prompt.WaitForChoiceAsync().ConfigureAwait(true);
+        });
+    }
+}