using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Linq.Expressions;
using System.Text;
using System.Web.Mvc.Html;

namespace HeuristicLab.Services.Optimization.Web.Helpers {
  // http://stackoverflow.com/questions/5621013/pass-enum-to-html-radiobuttonfor-mvc3
  public static class HtmlExtensions {
    public static MvcHtmlString RadioButtonForEnum<TModel, TProperty>(
        this HtmlHelper<TModel> htmlHelper,
        Expression<Func<TModel, TProperty>> expression
    ) {
      var metaData = ModelMetadata.FromLambdaExpression(expression, htmlHelper.ViewData);
      var names = Enum.GetNames(metaData.ModelType);
      var sb = new StringBuilder();
      foreach (var name in names) {
        var id = string.Format(
            "{0}_{1}_{2}",
            htmlHelper.ViewData.TemplateInfo.HtmlFieldPrefix,
            metaData.PropertyName,
            name
        );

        var radio = htmlHelper.RadioButtonFor(expression, name, new { id = id }).ToHtmlString();
        sb.AppendFormat(
            "<label for=\"{0}\">{1}</label> {2}",
            id,
            HttpUtility.HtmlEncode(name),
            radio
        );
      }
      return MvcHtmlString.Create(sb.ToString());
    }
  }
}