//
//  ListBox.cs
//
//  Author:
//       Jean-Philippe Bruyère <jp.bruyere@hotmail.com>
//
//  Copyright (c) 2015 jp
//
//  This program is free software: you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
//
//  This program is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with this program.  If not, see <http://www.gnu.org/licenses/>.
using System;
using System.Collections;
using System.Xml.Serialization;
using System.ComponentModel;
//TODO: implement ItemTemplate node in xml
using System.IO;
using System.Diagnostics;
using System.Xml;
using System.Collections.Generic;
using System.Threading;

namespace Crow
{
	[DefaultTemplate("#Crow.Templates.ListBox.goml")]
	//[DefaultTemplate("#Crow.Templates.ItemTemplate.goml")]
	public class ListBox : TemplatedControl//, IXmlSerializable
	{
		#region CTOR
		public ListBox () : base() {}
		#endregion

		Group _list;
		IList data;
		int _selectedIndex;
		string _itemTemplate;

		public event EventHandler<SelectionChangeEventArgs> SelectedItemChanged;

		#region implemented abstract members of TemplatedControl
		protected override void loadTemplate (GraphicObject template = null)
		{
			base.loadTemplate (template);
			_list = this.child.FindByName ("List") as Group;
		}
		#endregion

		[XmlAttributeAttribute][DefaultValue("#Crow.Templates.ItemTemplate.goml")]
		public string ItemTemplate {
			get { return _itemTemplate; }
			set { 
				//TODO:reload list with new template?
				_itemTemplate = value; 
			}
		}
		[XmlAttributeAttribute][DefaultValue(-1)]
		public int SelectedIndex{
			get { return _selectedIndex; }
			set { _selectedIndex = value; }
		}
		public object SelectedItem{
			get { return data == null ? null : data[_selectedIndex]; }
		}
		[XmlAttributeAttribute]//[DefaultValue(null)]
		public IList Data {
			get {
				return data;
			}
			set {
				
				data = value;

				_list.ClearChildren ();

				if (data == null)
					return;
				
				#if DEBUG_LOAD_TIME
				Stopwatch loadingTime = new Stopwatch ();
				loadingTime.Start ();
				#endif

				MemoryStream ms = new MemoryStream ();
				lock (ItemTemplate) {
					using (Stream stream = Interface.GetStreamFromPath (ItemTemplate))
						stream.CopyTo (ms);
				}

				Type t = Interface.GetTopContainerOfGOMLStream (ms);

				foreach (var item in data) {
					ms.Seek(0,SeekOrigin.Begin);
					GraphicObject g = Interface.Load (ms, t);
					g.DataSource = item;
					g.MouseClick += itemClick;
					_list.addChild (g);
				}

				ms.Dispose ();			

				#if DEBUG_LOAD_TIME
				loadingTime.Stop ();
				Debug.WriteLine("Listbox {2} Loading: {0} ticks \t, {1} ms",
				loadingTime.ElapsedTicks,
				loadingTime.ElapsedMilliseconds, this.ToString());
				#endif

			}
		}

		void itemClick(object sender, OpenTK.Input.MouseButtonEventArgs e){
			SelectedItemChanged.Raise (sender, new SelectionChangeEventArgs((sender as GraphicObject).DataSource));
			NotifyValueChanged ("SelectedItem", (sender as GraphicObject).DataSource);
			//Debug.WriteLine ((sender as GraphicObject).DataSource);
		}

		#region IXmlSerializable
//		public override System.Xml.Schema.XmlSchema GetSchema(){ return null; }
//		public override void ReadXml(System.Xml.XmlReader reader)
//		{
//			//Template could be either an attribute containing path or expressed inlined
//			//as a Template Element
//			using (System.Xml.XmlReader subTree = reader.ReadSubtree())
//			{
//				subTree.Read ();
//
//				string template = reader.GetAttribute ("Template");
//				string tmp = subTree.ReadOuterXml ();
//
//				//Load template from path set as attribute in templated control
//				if (string.IsNullOrEmpty (template)) {					
//					//seek for template tag first
//					using (XmlReader xr = new XmlTextReader (tmp, XmlNodeType.Element, null)) {
//						//load template first if inlined
//
//						xr.Read (); //skip current node
//
//						while (!xr.EOF) {
//							xr.Read (); //read first child
//							if (!xr.IsStartElement ())
//								continue;
//							if (xr.Name == "Template") {
//								xr.Read ();
//
//								Type t = Type.GetType ("Crow." + xr.Name);
//								GraphicObject go = (GraphicObject)Activator.CreateInstance (t);                                
//								(go as IXmlSerializable).ReadXml (xr);
//
//								loadTemplate (go);
//
//								xr.Read ();//go close tag
//								xr.Read ();//Template close tag
//								break;
//							} else {
//								xr.ReadInnerXml ();
//							}
//						}
//					}				
//				} else
//					loadTemplate (Interface.Load (template, this));
//
//
//				//normal xml read
//				using (XmlReader xr = new XmlTextReader (tmp, XmlNodeType.Element, null)) {
//					xr.Read ();
//					base.ReadXml(xr);
//				}
//			}
//		}
//		public override void WriteXml(System.Xml.XmlWriter writer)
//		{
//			//TODO:
//			throw new NotImplementedException();
//		}
		#endregion
	}
}