Wino-Mail/Wino.Core.UWP/Services/UnderlyingThemeService.cs

using Windows.UI.ViewManagement;
using Wino.Core.Domain.Enums;
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, ApplicationElementTheme.Default);

            if (currentTheme == ApplicationElementTheme.Default)
                return uiSettings.GetColorValue(UIColorType.Background).ToString() == "#FF000000";
            else
                return currentTheme == ApplicationElementTheme.Dark;
        }
    }
}