using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Text.RegularExpressions;

namespace Sleis.HtmlHelpers
{
    public static class ListModelBindingExtensions
    {
        static Regex _stripIndexerRegex = new Regex(@"\[(?<index>\d+)\]", RegexOptions.Compiled);

        public static string GetIndexerFieldName(this TemplateInfo templateInfo)
        {
            string fieldName = templateInfo.GetFullHtmlFieldName("Index");
            fieldName = _stripIndexerRegex.Replace(fieldName, string.Empty);
            if (fieldName.StartsWith("."))
            {
                fieldName = fieldName.Substring(1);
            }
            return fieldName;
        }

        public static int GetIndex(this TemplateInfo templateInfo)
        {
            string fieldName = templateInfo.GetFullHtmlFieldName("Index");
            var match = _stripIndexerRegex.Match(fieldName);
            if (match.Success)
            {
                return int.Parse(match.Groups["index"].Value);
            }
            return 0;
        }

        public static MvcHtmlString HiddenIndexerInputForModel<TModel>(this HtmlHelper<TModel> html)
        {
            string name = html.ViewData.TemplateInfo.GetIndexerFieldName();
            object value = html.ViewData.TemplateInfo.GetIndex();
            string markup = String.Format(@"<input type=""hidden"" name=""{0}"" value=""{1}"" />", name, value);
            return MvcHtmlString.Create(markup);
        }
        public static MvcHtmlString HiddenIndexerInputForModel<TModel>(this HtmlHelper<TModel> html, object index)
        {
            string name = html.ViewData.TemplateInfo.GetIndexerFieldName();
            object value = index;
            string markup = String.Format(@"<input type=""hidden"" name=""{0}"" value=""{1}"" />", name, value);
            return MvcHtmlString.Create(markup);
        }
    }
}