Initial commit.

Wino.Core.UWP/Services/UnderlyingThemeService.cs

@@ -0,0 +1,32 @@
+using Windows.UI.ViewManagement;
+using Windows.UI.Xaml;
+using Wino.Core.Domain.Interfaces;
+
+namespace Wino.Core.UWP.Services
+{
+    public class UnderlyingThemeService : IUnderlyingThemeService
+    {
+        public const string SelectedAppThemeKey = nameof(SelectedAppThemeKey);
+
+        private readonly UISettings uiSettings = new UISettings();
+        private readonly IConfigurationService _configurationService;
+
+        public UnderlyingThemeService(IConfigurationService configurationService)
+        {
+            _configurationService = configurationService;
+        }
+
+        // This should not rely on application window to be present.
+        // Check theme from the settings, rely on UISettings background color if Default.
+
+        public bool IsUnderlyingThemeDark()
+        {
+            var currentTheme = _configurationService.Get(SelectedAppThemeKey, ElementTheme.Default);
+
+            if (currentTheme == ElementTheme.Default)
+                return uiSettings.GetColorValue(UIColorType.Background).ToString() == "#FF000000";
+            else
+                return currentTheme == ElementTheme.Dark;
+        }
+    }
+}