// 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.Rendering;
using Microsoft.AspNetCore.Mvc.ViewFeatures;
using Microsoft.AspNetCore.Razor.TagHelpers;
 
namespace TagHelpersWebSite.TagHelpers;
 
[HtmlTargetElement("*")]
public class PrettyTagHelper : TagHelper
{
    private static readonly Dictionary<string, string> PrettyTagStyles =
        new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase)
        {
                { "a", "background-color: gray;color: white;border-radius: 3px;"
                    + "border: 1px solid black;padding: 3px;font-family: cursive;" },
                { "strong", "font-size: 1.25em;text-decoration: underline;" },
                { "h1", "font-family: cursive;" },
                { "h3", "font-family: cursive;" }
        };
 
    public bool? MakePretty { get; set; }
 
    public string Style { get; set; }
 
    [ViewContext]
    [HtmlAttributeNotBound]
    public ViewContext ViewContext { get; set; }
 
    public override void Process(TagHelperContext context, TagHelperOutput output)
    {
        if (MakePretty.HasValue && !MakePretty.Value)
        {
            return;
        }
 
        if (output.TagName == null)
        {
            // Another tag helper e.g. TagHelperviewComponentTagHelper has suppressed the start and end tags.
            return;
        }
 
        string prettyStyle;
 
        if (PrettyTagStyles.TryGetValue(output.TagName, out prettyStyle))
        {
            var style = Style ?? string.Empty;
            if (!string.IsNullOrEmpty(style))
            {
                style += ";";
            }
 
            output.Attributes.SetAttribute("style", style + prettyStyle);
        }
    }
}