using System;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Globalization;

namespace WebBlocks
{
	public class RepeaterRadioButton : RadioButton, IPostBackDataHandler
	{
        public RepeaterRadioButton() : base()
		{
		}

		private string Value
		{
			get { return (Attributes["value"] == null ? UniqueID : UniqueID + "_" + Attributes["value"]); }
		}

		protected override void Render(HtmlTextWriter output)
		{
            output.AddAttribute(HtmlTextWriterAttribute.Id, ClientID);
            output.AddAttribute(HtmlTextWriterAttribute.Type, "radio");
            output.AddAttribute(HtmlTextWriterAttribute.Name, GroupName);
            output.AddAttribute(HtmlTextWriterAttribute.Value, Value);
            
            if (Checked)
                output.AddAttribute(HtmlTextWriterAttribute.Checked, "checked");

            if (!Enabled)
                output.AddAttribute(HtmlTextWriterAttribute.Disabled, "disabled");

            string onClick = Attributes["onclick"];
            if (AutoPostBack)
            {
                if (onClick != null)
                    onClick = String.Empty;
                onClick += Page.ClientScript.GetPostBackEventReference(this, String.Empty);
                output.AddAttribute(HtmlTextWriterAttribute.Onclick, onClick);
                output.AddAttribute("language", "javascript");
            }
            else
            {
                if (onClick != null)
                    output.AddAttribute(HtmlTextWriterAttribute.Onclick, onClick);
            }

            if (AccessKey.Length > 0)
                output.AddAttribute(HtmlTextWriterAttribute.Accesskey, AccessKey);
            if (TabIndex != 0)
                output.AddAttribute(HtmlTextWriterAttribute.Tabindex, TabIndex.ToString(NumberFormatInfo.InvariantInfo));

            output.RenderBeginTag(HtmlTextWriterTag.Input);
            output.RenderEndTag();
		}

		void IPostBackDataHandler.RaisePostDataChangedEvent()
		{
			OnCheckedChanged(EventArgs.Empty);
		}

		bool IPostBackDataHandler.LoadPostData(string postDataKey, 
			System.Collections.Specialized.NameValueCollection postCollection)
		{
			bool result = false;
			string value = postCollection[GroupName];
			if((value != null) && (value == Value))
			{
				if(!Checked)
				{
					Checked = true;
					result = true;
				}
			}
			else
			{
				if(Checked)
					Checked = false;
			}
			return result;
		}
	}
}