using System;
using System.Linq.Expressions;
using System.Web.Mvc;

namespace MvcHtmlHelpers
{
    public static class HtmlHelperExtensions
    {
        /// <summary>
        /// Return the raw DisplayName attribute of a property of a Model,
        /// a-la @Html.LabelFor, without the label.
        /// </summary>
        /// <typeparam name="TModel">Model to access</typeparam>
        /// <typeparam name="TValue">Property of model to access.</typeparam>
        /// <param name="self">Default parameter. Always passed.</param>
        /// <param name="expression">Lambda expression to evaluate.</param>
        /// <returns>DisplayName as a raw String with no markup.</returns>
        public static MvcHtmlString DisplayNameFor<TModel, TValue>(
            this HtmlHelper<TModel> self,
            Expression<Func<TModel, TValue>> expression
            )
        {
            var metadata = ModelMetadata.FromLambdaExpression(expression, self.ViewData);

            return new MvcHtmlString(metadata.DataTypeName);
        }
    }
}