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

namespace Kreta.Web.Helpers
{
    public static class DisplayTextExtensions
    {
        public static MvcHtmlString KretaDisplayTextFor<TModel, TValue>(this HtmlHelper<TModel> html, Expression<Func<TModel, TValue>> expression, IDictionary<string, object> htmlAttributes = null, string id = null)
        {
            ModelMetadata metadata = ModelMetadata.FromLambdaExpression(expression, html.ViewData);
            string htmlFieldName = ExpressionHelper.GetExpressionText(expression);
            string fullHtmlFieldId = html.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldId(htmlFieldName);
            string text = metadata.Model?.ToString();

            if (string.IsNullOrWhiteSpace(text))
            {
                return MvcHtmlString.Empty;
            }

            var tag = new TagBuilder("label");
            tag.MergeAttributes(htmlAttributes);
            if (!string.IsNullOrWhiteSpace(id))
            {
                tag.MergeAttribute("id", id);
            }
            tag.MergeAttribute("displayfor", fullHtmlFieldId);
            tag.AddCssClass("windowInputValue");
            tag.SetInnerText(text);

            return MvcHtmlString.Create(tag.ToString(TagRenderMode.Normal));
        }
    }
}