// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Rendering;
using Microsoft.AspNetCore.Mvc.Routing;
using Microsoft.AspNetCore.Mvc.ViewFeatures;
using Microsoft.AspNetCore.Razor.TagHelpers;
 
namespace TagHelpersWebSite.TagHelpers;
 
public class ATagHelper : TagHelper
{
    public ATagHelper(IUrlHelperFactory urlHelperFactory)
    {
        UrlHelperFactory = urlHelperFactory;
    }
 
    [HtmlAttributeNotBound]
    public IUrlHelperFactory UrlHelperFactory { get; }
 
    [ViewContext]
    [HtmlAttributeNotBound]
    public ViewContext ViewContext { get; set; }
 
    public string Controller { get; set; }
 
    public string Action { get; set; }
 
    public override void Process(TagHelperContext context, TagHelperOutput output)
    {
        if (Controller != null && Action != null)
        {
            var methodParameters = output.Attributes.ToDictionary(attribute => attribute.Name,
                                                                  attribute => attribute.Value);
 
            // We remove all attributes from the resulting HTML element because they're supposed to
            // be parameters to our final href value.
            output.Attributes.Clear();
 
            var urlHelper = UrlHelperFactory.GetUrlHelper(ViewContext);
            output.Attributes.SetAttribute("href", urlHelper.Action(Action, Controller, methodParameters));
 
            output.PreContent.SetContent("My ");
        }
    }
}