using System;
using System.Collections.Generic;
using System.Text;
using Volian.CSLA.Library;
using System.Windows.Forms;
using Csla;
using System.Collections;

namespace Volian.CSLA.Library
{
	public abstract class VETreeNode : TreeNode
	{
		#region Business Methods
		protected IVEReadOnlyItem _VEObject;
		public IVEReadOnlyItem VEObject
		{
			get { return _VEObject; }
			set
			{
				_VEObject = value;
				base.Text = _VEObject.ToString();
				ResetNode();
			}
		}
		public void Refresh()
		{
			if (_VEObject != null)
				Text = _VEObject.ToString();
		}
		// Only load the Children Once
		protected bool _ChildrenLoaded = false;
		public bool ChildrenLoaded
		{
			get { return _ChildrenLoaded; }
		}
		// Reset Node
		public void CloseNode()
		{
			ResetNode();
		}
		private void ResetNode()
		{
			if (_VEObject!=null && _VEObject.HasChildren())
			{
				_ChildrenLoaded = false;// Reset the children loaded flag
				this.Nodes.Add("Dummy");// Add a Dummy Node so that the item will appear to be expanable.
			}
			else
			{
				_ChildrenLoaded = true;// Reset the children loaded flag
			}
			// ToDo: Need to reset object as well
		}
		public void RefreshNode()
		{
			ResetNode();// Drop Children
			LoadChildren();// Load Children
		}
		public abstract void LoadChildren();
		//public IVEReadOnlyItem GetCsla()
		//{
		//  return _VEObject;
		//}
		#endregion
		#region Factory Methods
		// Constructors
		public VETreeNode() : base("NoText") { ; }
		public VETreeNode(IVEReadOnlyItem o)
			: base(o.ToString())
		{
			_VEObject = o;// Save the BusinessObject
			ResetNode();
		}
		public VETreeNode(string s)
			: base(s)
		{
			_VEObject = null;// Save the BusinessObject
			ResetNode();
		}
		#endregion
	}
	public class VETreeNodeBase<T> : VETreeNode
	where T : VETreeNode, new()
	{
		#region Factory Methods
		public VETreeNodeBase(string s) : base(s) { ;}
		public VETreeNodeBase(IVEReadOnlyItem o) : base(o) { ;}
		protected VETreeNodeBase() : base() { ;}
		public override void LoadChildren()
		{
			if (!_ChildrenLoaded)
			{
				this.Nodes.Clear();
				IList ol = _VEObject.GetChildren();
				if (ol != null)
				{
					foreach (IVEReadOnlyItem o in ol)
					{
						try
						{
							T tmp = new T();
							tmp.VEObject = o;
							this.Nodes.Add(tmp);
						}
						catch (Exception ex)
						{
							Console.WriteLine("{0}\r\n{1}", ex.Message, ex.InnerException);
						}
					}
				}
				_ChildrenLoaded = true;
			}
		}
	#endregion
	}
	public class VEFolder : VETreeNodeBase<VEVersion>
	{
		public static VEFolder LoadTree()
		{
			VEFolder root = null;
			FolderInfoList fil = FolderInfoList.Get();
			Dictionary<int, VEFolder> dicMissing = new Dictionary<int, VEFolder>();
			Dictionary<int, VEFolder> dicExists = new Dictionary<int, VEFolder>();
			foreach (FolderInfo fi in fil)
			{
				VEFolder ftp = null;
				if (dicExists.ContainsKey(fi.ParentID))
				{
					ftp = dicExists[fi.ParentID];
				}
				else
				{
					if (fi.ParentID != 0)
					{
						ftp = new VEFolder(fi.ParentID.ToString());
						dicMissing.Add(fi.ParentID, ftp);
						dicExists.Add(fi.ParentID, ftp);
					}
				}
				VEFolder ft = null;
				if (dicMissing.ContainsKey(fi.FolderID))
				{
					ft = dicMissing[fi.FolderID];
					ft.VEObject = fi;
					dicMissing.Remove(fi.FolderID);
				}
				else
				{
					ft = new VEFolder(fi);
					dicExists.Add(fi.FolderID, ft);
				}
				if (fi.ParentID == 0)
					root = ft;
				else
					ftp.Nodes.Add(ft);
			}
			//root.FindTree = dicExists;
			return root;
		}
		private VEFolder(string s) : base(s) { ;}
		public VEFolder(IVEReadOnlyItem o) : base(o) { ;}
	}
	public class VEVersion : VETreeNodeBase<VEProcedure> { }
	public class VEProcedure : VETreeNodeBase<VESection>
	{
		public override void LoadChildren()
		{
			if (!_ChildrenLoaded)
			{
				this.Nodes.Clear();
				Dictionary<string, VESection> dicSect = new Dictionary<string, VESection>();
				SectionInfoList ol = (SectionInfoList)_VEObject.GetChildren();
				if (ol != null)
				{
					foreach (SectionInfo o in ol)
					{
						try
						{
							VESection tmp = new VESection();
							tmp.VEObject = o;
							if (dicSect.ContainsKey(o.PPath))
								dicSect[o.PPath].Nodes.Add(tmp);
							else 
								this.Nodes.Add(tmp);
							dicSect[o.Path] = tmp;
						}
						catch (Exception ex)
						{
							Console.WriteLine("{0}\r\n{1}", ex.Message, ex.InnerException);
						}
					}
				}
				_ChildrenLoaded = true;
			}
		}
	}
	public class VESection : VETreeNodeBase<VEStep> { }
	public class VEStep : VETreeNodeBase<VEStep> { }
}