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

namespace System.Web.Mvc
{
    public static class CombotreeExtensions
    {
        public static System.Web.Mvc.MvcHtmlString Combotree(
            this System.Web.Mvc.HtmlHelper htmlHelper
            , CombotreeOptions combotreeOptions
            , IDictionary<string, object> htmlAttributes = null)
        {

            return MvcHtmlString.Create(Bowin.Web.Controls.Mvc.Combotree.CreateControl(combotreeOptions, htmlAttributes).Render());
        }

        public static MvcHtmlString CombotreeFor<TModel, TProperty>(
            this HtmlHelper<TModel> htmlHelper
            , Expression<Func<TModel, TProperty>> expression
            , string dataSourceUrl)
        {
            var combotreeOptions = new CombotreeOptions { DataSourceUrl = dataSourceUrl };

            var htmldic = AnalyzingExpression<TModel, TProperty>(htmlHelper, expression, combotreeOptions);

            return Combotree(htmlHelper, combotreeOptions, htmldic);
        }

        public static MvcHtmlString CombotreeFor<TModel, TProperty>(
            this HtmlHelper<TModel> htmlHelper
            , Expression<Func<TModel, TProperty>> expression
            , CombotreeOptions combotreeOptions)
        {
           var htmldic =  AnalyzingExpression<TModel, TProperty>(htmlHelper, expression, combotreeOptions);

           return Combotree(htmlHelper, combotreeOptions, htmldic);
        }

        public static MvcHtmlString CombotreeFor<TModel, TProperty>(
            this HtmlHelper<TModel> htmlHelper
            , Expression<Func<TModel, TProperty>> expression
            , CombotreeOptions combotreeOptions
            , IDictionary<string, object> htmlAttributes)
        {
            AnalyzingExpression<TModel, TProperty>(htmlHelper, expression, combotreeOptions);

            return Combotree(htmlHelper, combotreeOptions, htmlAttributes);
        }

        private static IDictionary<string,object> AnalyzingExpression<TModel, TProperty>(HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, CombotreeOptions combotreeOptions)
        {
            if (expression == null)
            {
                throw new ArgumentNullException("expression");
            }

            ModelMetadata modelMetadata = ModelMetadata.FromLambdaExpression<TModel, TProperty>(expression, htmlHelper.ViewData);

            
            string fullHtmlFieldName = htmlHelper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(ExpressionHelper.GetExpressionText(expression));


            combotreeOptions.Name = fullHtmlFieldName;
            if (modelMetadata.Model != null)
            {
                //Guid emptyg = Guid.Parse(modelMetadata.Model.ToString());
                //if (emptyg != Guid.Empty)
                //{
					combotreeOptions.SelectedValue = modelMetadata.Model;
				//}
            }

            return htmlHelper.GetUnobtrusiveValidationAttributes(fullHtmlFieldName, modelMetadata);
        }
    }
}