using System;
using Avalonia;
using Avalonia.Markup.Xaml;

namespace AutoCat.Utils;

public class ViewModelProvider: MarkupExtension
{
    private readonly Type _viewModelType;

    public ViewModelProvider(Type viewModelType)
    {
        _viewModelType = viewModelType;
    }
    
    public override object ProvideValue(IServiceProvider serviceProvider)
    {
        if (Application.Current is App app)
            return app.AppHost.Services.GetService(_viewModelType) 
                   ?? throw new Exception("Error finding ViewModel");
        else
            throw new Exception("Error getting App instance");
    }
}