using Microsoft.AspNetCore.Mvc.Rendering;
using Microsoft.AspNetCore.Mvc.ViewEngines;
using Microsoft.AspNetCore.Mvc.ViewFeatures;
using Microsoft.AspNetCore.Mvc;

namespace FSI.BT.IR.Organization.Web;

public class Helper
{
    public static string RenderRazorViewToString(Controller controller, string viewName, object model = null)
    {
        controller.ViewData.Model = model;
        using (var sw = new StringWriter())
        {
            IViewEngine viewEngine = controller.HttpContext.RequestServices.GetService(typeof(ICompositeViewEngine)) as ICompositeViewEngine;
            ViewEngineResult viewResult = viewEngine.FindView(controller.ControllerContext, viewName, false);

            ViewContext viewContext = new ViewContext(
                controller.ControllerContext,
                viewResult.View,
                controller.ViewData,
                controller.TempData,
                sw,
                new HtmlHelperOptions()
            );
            viewResult.View.RenderAsync(viewContext);
            return sw.GetStringBuilder().ToString();
        }
    }
}