Migrate remaining legacy operator workflows

MainWindow.CloseConfirmation.cs

@@ -0,0 +1,124 @@
+using MBN_STOCK_WEBVIEW.Core.Playout;
+using Microsoft.UI.Windowing;
+using WinRT.Interop;
+
+namespace MBN_STOCK_WEBVIEW;
+
+public sealed partial class MainWindow
+{
+    private AppWindow? _closeConfirmationAppWindow;
+    private int _closeConfirmationPending;
+    private int _closeConfirmed;
+
+    private void EnsureCloseConfirmationAttached()
+    {
+        if (_closeConfirmationAppWindow is not null)
+        {
+            return;
+        }
+
+        try
+        {
+            var windowHandle = WindowNative.GetWindowHandle(this);
+            var windowId = Microsoft.UI.Win32Interop.GetWindowIdFromWindow(windowHandle);
+            var appWindow = AppWindow.GetFromWindowId(windowId);
+            appWindow.Closing += OnAppWindowClosing;
+            _closeConfirmationAppWindow = appWindow;
+        }
+        catch
+        {
+            // Root.Loaded retries the attachment after the native window has been created.
+        }
+    }
+
+    private async void OnAppWindowClosing(AppWindow sender, AppWindowClosingEventArgs args)
+    {
+        if (Volatile.Read(ref _closeConfirmed) != 0)
+        {
+            return;
+        }
+
+        // AppWindow.Closing cannot be deferred. Cancel this close synchronously and issue a
+        // second, explicitly confirmed close only after the modal result is known.
+        args.Cancel = true;
+        if (Interlocked.CompareExchange(ref _closeConfirmationPending, 1, 0) != 0)
+        {
+            return;
+        }
+
+        try
+        {
+            if (Root.XamlRoot is null)
+            {
+                return;
+            }
+
+            var dialog = new ContentDialog
+            {
+                XamlRoot = Root.XamlRoot,
+                Title = "프로그램 종료",
+                Content = BuildCloseConfirmationMessage(),
+                PrimaryButtonText = "종료",
+                CloseButtonText = "취소",
+                DefaultButton = ContentDialogButton.Close
+            };
+
+            var result = await dialog.ShowAsync();
+            if (result != ContentDialogResult.Primary)
+            {
+                return;
+            }
+
+            Interlocked.Exchange(ref _closeConfirmed, 1);
+            Close();
+        }
+        catch
+        {
+            // If the confirmation surface cannot be shown, fail closed and keep the app open.
+        }
+        finally
+        {
+            Interlocked.Exchange(ref _closeConfirmationPending, 0);
+        }
+    }
+
+    private string BuildCloseConfirmationMessage()
+    {
+        var status = _playoutEngine?.Status;
+        var hasPreparedScene = !string.IsNullOrWhiteSpace(status?.PreparedSceneName);
+        var hasOnAirScene = !string.IsNullOrWhiteSpace(status?.OnAirSceneName);
+        var commandPending = Volatile.Read(ref _playoutCommandInFlight) != 0 ||
+            status?.IsPlayCompletionPending == true;
+        var outcomeUnknown = Volatile.Read(ref _browserCorrelationQuarantined) != 0 ||
+            status?.State == PlayoutConnectionState.OutcomeUnknown;
+
+        if (outcomeUnknown)
+        {
+            return "송출 결과를 확정할 수 없는 상태입니다. PGM과 Network Monitoring을 확인한 뒤 종료하세요. " +
+                "종료 과정에서 TAKE OUT 또는 다른 송출 명령을 자동으로 반복하지 않습니다. 그래도 종료하시겠습니까?";
+        }
+
+        if (commandPending)
+        {
+            return "송출 명령 또는 callback 처리가 진행 중입니다. 결과를 확인한 뒤 종료하는 것이 안전합니다. " +
+                "그래도 종료하시겠습니까?";
+        }
+
+        if (hasOnAirScene || hasPreparedScene)
+        {
+            return "PREPARED 또는 PROGRAM 장면이 남아 있습니다. 필요한 경우 먼저 TAKE OUT을 실행하고 " +
+                "PGM을 확인하세요. 종료 과정에서는 TAKE OUT을 자동 실행하지 않습니다. 그래도 종료하시겠습니까?";
+        }
+
+        return "프로그램을 종료하시겠습니까?";
+    }
+
+    private void DetachCloseConfirmation()
+    {
+        var appWindow = Interlocked.Exchange(ref _closeConfirmationAppWindow, null);
+        if (appWindow is not null)
+        {
+            appWindow.Closing -= OnAppWindowClosing;
+        }
+    }
+}