using System.Web;
using System.Web.Mvc;
using System.Web.Mvc.Html;

namespace My.Helpers
{
    /// <summary>
    /// MVC HtmlHelper extension methods - html element extensions
    /// </summary>
    public static class PartialExtensions
    {
        /// <summary>
        /// Allows a partial to be rendered within quotation marks.
        /// I use this with jQuery tooltips where we store the tooltip HMTL within a partial.
        /// See example usage below:
        /// <div class="tooltip" title="@Html.PartialAttributeEncoded("_MyTooltipInAPartial")">Some content</div>
        /// </summary>
        /// <param name="helper"></param>
        /// <param name="partialViewName"></param>
        /// <param name="model"></param>
        /// <returns></returns>
        public static MvcHtmlString PartialAttributeEncoded(
          this HtmlHelper helper,
          string partialViewName,
          object model = null
        )
        {
            //Create partial using the relevant overload (only implemented ones I used)
            var partialString = (model == null)
                ? helper.Partial(partialViewName)
                : helper.Partial(partialViewName, model);

            //Attribute encode the partial string - note that we have to .ToString() this to get back from an MvcHtmlString
            var partialStringAttributeEncoded = HttpUtility.HtmlAttributeEncode(partialString.ToString());

            //Turn this back into an MvcHtmlString
            var partialMvcStringAttributeEncoded = MvcHtmlString.Create(partialStringAttributeEncoded);

            return partialMvcStringAttributeEncoded;
        }
    }
}