Billing/Billing.Shared/App.cs

using Billing.Languages;
using Billing.Themes;
using Xamarin.Essentials;
using Xamarin.Forms;

namespace Billing;

public class App : Application
{
    public static AppTheme CurrentTheme { get; private set; }
    public static PlatformCulture CurrentCulture { get; private set; }

    public App()
    {
        CurrentCulture = new PlatformCulture();
        InitResources();

        MainPage = new MainShell();
        Shell.Current.GoToAsync("//Bills");
    }

    protected override void OnStart()
    {
    }

    protected override void OnResume()
    {
        SetTheme(AppInfo.RequestedTheme);
    }

    private void InitResources()
    {
        var theme = AppInfo.RequestedTheme;
        SetTheme(theme, true);
    }

    private void SetTheme(AppTheme theme, bool force = false)
    {
        if (force || theme != CurrentTheme)
        {
            CurrentTheme = theme;
        }
        else
        {
            return;
        }
        Helper.Debug($"application theme: {theme}");

        BaseTheme instance;
        if (theme == AppTheme.Dark)
        {
            instance = Dark.Instance;
        }
        else
        {
            instance = Light.Instance;
        }
        // TODO: status bar
        Resources = instance;
    }
}