Hide main window when device connects (#330)

Co-authored-by: Owen McGirr <o.a.mcgirr@gmail.com>

Author: enaboapps

src/SwitchifyPc.App/App.xaml.cs

@@ -293,6 +293,7 @@ private void HandleBluetoothEvent(BluetoothHelperEvent helperEvent)
                     break;
                 case BluetoothConnectedEvent connected:
                     bluetoothStatusTracker.AddConnection(connected.ConnectionId);
+                    HideMainWindowAfterDeviceConnected();
                     break;
                 case BluetoothDisconnectedEvent disconnected:
                     BluetoothStatus status = bluetoothStatusTracker.RemoveConnection(disconnected.ConnectionId, disconnected.Reason);
@@ -429,6 +430,20 @@ private void UpdateMainWindowState(UpdateState state)
         Dispatcher.BeginInvoke(() => mainWindowViewModel.SetUpdateState(state));
     }
 
+    private void HideMainWindowAfterDeviceConnected()
+    {
+        if (MainWindow is not { IsVisible: true } window) return;
+
+        if (!MainWindowAutoHidePolicy.ShouldHideAfterDeviceConnected(
+            isMainWindowVisible: true,
+            hasPairingApprovals: mainWindowViewModel.HasPairingApprovals))
+        {
+            return;
+        }
+
+        window.Hide();
+    }
+
     private void UpdateBluetoothState(BluetoothStatus status)
     {
         DesktopUiState desktopState = status.Status switch

src/SwitchifyPc.Core/Ui/MainWindowAutoHidePolicy.cs

@@ -0,0 +1,11 @@
+namespace SwitchifyPc.Core.Ui;
+
+public static class MainWindowAutoHidePolicy
+{
+    public static bool ShouldHideAfterDeviceConnected(
+        bool isMainWindowVisible,
+        bool hasPairingApprovals)
+    {
+        return isMainWindowVisible && !hasPairingApprovals;
+    }
+}

src/SwitchifyPc.Tests/MainWindowAutoHidePolicyTests.cs

@@ -0,0 +1,30 @@
+using SwitchifyPc.Core.Ui;
+
+namespace SwitchifyPc.Tests;
+
+public sealed class MainWindowAutoHidePolicyTests
+{
+    [Fact]
+    public void HidesVisibleMainWindowWhenDeviceConnects()
+    {
+        Assert.True(MainWindowAutoHidePolicy.ShouldHideAfterDeviceConnected(
+            isMainWindowVisible: true,
+            hasPairingApprovals: false));
+    }
+
+    [Fact]
+    public void DoesNotHideWhenMainWindowIsAlreadyHidden()
+    {
+        Assert.False(MainWindowAutoHidePolicy.ShouldHideAfterDeviceConnected(
+            isMainWindowVisible: false,
+            hasPairingApprovals: false));
+    }
+
+    [Fact]
+    public void DoesNotHideWhenPairingApprovalIsVisible()
+    {
+        Assert.False(MainWindowAutoHidePolicy.ShouldHideAfterDeviceConnected(
+            isMainWindowVisible: true,
+            hasPairingApprovals: true));
+    }
+}