//
// System.Web.UI.WebControls.RadioButton.cs
//
// Author:
//      Dick Porter  <dick@ximian.com>
//
// Copyright (C) 2005 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System.Collections.Specialized;
using System.ComponentModel;
using System.Security.Permissions;

namespace System.Web.UI.WebControls {

	// CAS
	[AspNetHostingPermissionAttribute (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
	[AspNetHostingPermissionAttribute (SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]
	// attributes
	[Designer ("System.Web.UI.Design.WebControls.CheckBoxDesigner, " + Consts.AssemblySystem_Design, "System.ComponentModel.Design.IDesigner")]
	[SupportsEventValidation]
	public class RadioButton : CheckBox , IPostBackDataHandler
	{
		public RadioButton () : base ("radio")
		{
		}

		[DefaultValue ("")]
		[Themeable (false)]
		[WebSysDescription ("")]
		[WebCategory ("Behavior")]
		public virtual string GroupName
		{
			get {
				return (ViewState.GetString ("GroupName",
							     String.Empty));
			}
			set {
				ViewState["GroupName"] = value;
			}
		}

		internal override string NameAttribute 
		{
			get {
				string unique = UniqueID;
				string gn = GroupName;
				if (gn.Length == 0)
					return unique;
				int colon = -1;
				if (unique != null) {
					colon = unique.LastIndexOf (IdSeparator);
				}
				
				if (colon == -1)
					return gn;
				
				return unique.Substring (0, colon + 1) + gn;
			}
		}

		internal string ValueAttribute {
			get {
				string val = (string)ViewState ["Value"];
				if (val != null)
					return val;
				
				string id = ID;
				if (!String.IsNullOrEmpty (id))
					return id;
				else
					return UniqueID;
			}
			set {
				ViewState["Value"] = value;
			}
		}

		internal override void InternalAddAttributesToRender (HtmlTextWriter w, bool enabled)
		{
			Page page = Page;
			if (page != null)
				page.ClientScript.RegisterForEventValidation (NameAttribute, ValueAttribute);
			base.InternalAddAttributesToRender (w, enabled);
			w.AddAttribute (HtmlTextWriterAttribute.Value, ValueAttribute);
		}

		protected internal
		override void OnPreRender (EventArgs e)
		{
			base.OnPreRender (e);
		}

		protected override
		bool LoadPostData (string postDataKey, NameValueCollection postCollection) 
		{
			string value = postCollection [NameAttribute];
			bool checkedOnClient = value == ValueAttribute;
			ValidateEvent (NameAttribute, value);
			if (Checked == checkedOnClient)
				return false;

			Checked = checkedOnClient;
			return checkedOnClient;			
		}

		protected override void RaisePostDataChangedEvent ()
		{
			if (CausesValidation)
				Page.Validate (ValidationGroup);
			OnCheckedChanged (EventArgs.Empty);
		}
		
		bool IPostBackDataHandler.LoadPostData (string postDataKey, NameValueCollection postCollection)
		{
			return LoadPostData (postDataKey, postCollection);
		}
	}
}