using System;

using System.Collections.Generic;

using System.Collections.ObjectModel;

using System.Runtime.Serialization;

using System.Security.Permissions;

namespace Aga.Controls.Tree

{

	[Serializable]

	public sealed class TreeNodeAdv : ISerializable

	{

		#region NodeCollection

		private class NodeCollection : Collection<TreeNodeAdv>

		{

			private TreeNodeAdv _owner;

			public NodeCollection(TreeNodeAdv owner)

			{

				_owner = owner;

			}

			protected override void ClearItems()

			{

				while (this.Count != 0)

					this.RemoveAt(this.Count - 1);

			}

			protected override void InsertItem(int index, TreeNodeAdv item)

			{

				if (item == null)

					throw new ArgumentNullException("item");

				if (item.Parent != _owner)

				{

					if (item.Parent != null)

						item.Parent.Nodes.Remove(item);

					item._parent = _owner;

					item._index = index;

					for (int i = index; i < Count; i++)

						this[i]._index++;

					base.InsertItem(index, item);

				}

				if (_owner.Tree != null && _owner.Tree.Model == null)

				{

					_owner.Tree.SmartFullUpdate();

				}

			}

			protected override void RemoveItem(int index)

			{

				TreeNodeAdv item = this[index];

				item._parent = null;

				item._index = -1;

				for (int i = index + 1; i < Count; i++)

					this[i]._index--;

				base.RemoveItem(index);

				if (_owner.Tree != null && _owner.Tree.Model == null)

				{

					_owner.Tree.UpdateSelection();

					_owner.Tree.SmartFullUpdate();

				}

			}

			protected override void SetItem(int index, TreeNodeAdv item)

			{

				if (item == null)

					throw new ArgumentNullException("item");

				RemoveAt(index);

				InsertItem(index, item);

			}

		}

		#endregion

		#region Events

		public event EventHandler<TreeViewAdvEventArgs> Collapsing;

		internal void OnCollapsing()

		{

			if (Collapsing != null)

				Collapsing(this, new TreeViewAdvEventArgs(this));

		}

		public event EventHandler<TreeViewAdvEventArgs> Collapsed;

		internal void OnCollapsed()

		{

			if (Collapsed != null)

				Collapsed(this, new TreeViewAdvEventArgs(this));

		}

		public event EventHandler<TreeViewAdvEventArgs> Expanding;

		internal void OnExpanding()

		{

			if (Expanding != null)

				Expanding(this, new TreeViewAdvEventArgs(this));

		}

		public event EventHandler<TreeViewAdvEventArgs> Expanded;

		internal void OnExpanded()

		{

			if (Expanded != null)

				Expanded(this, new TreeViewAdvEventArgs(this));

		}

		#endregion

		#region Properties

		private TreeViewAdv _tree;

		public TreeViewAdv Tree

		{

			get { return _tree; }

		}

		private int _row;

		public int Row

		{

			get { return _row; }

			internal set { _row = value; }

		}

		private int _index = -1;

		public int Index

		{

			get

			{

				return _index;

			}

		}

		private bool _isSelected;

		public bool IsSelected

		{

			get { return _isSelected; }

			set

			{

				if (_isSelected != value)

				{

					if (Tree.IsMyNode(this))

					{

						//_tree.OnSelectionChanging

						if (value)

						{

							if (!_tree.Selection.Contains(this))

								_tree.Selection.Add(this);

							if (_tree.Selection.Count == 1)

								_tree.CurrentNode = this;

						}

						else

							_tree.Selection.Remove(this);

						_tree.UpdateView();

						_tree.OnSelectionChanged();

					}

					_isSelected = value;

				}

			}

		}

		/// <summary>

		/// Returns true if all parent nodes of this node are expanded.

		/// </summary>

		internal bool IsVisible

		{

			get

			{

				TreeNodeAdv node = _parent;

				while (node != null)

				{

					if (!node.IsExpanded)

						return false;

					node = node.Parent;

				}

				return true;

			}

		}

		private bool _isLeaf;

		public bool IsLeaf

		{

			get { return _isLeaf; }

			internal set { _isLeaf = value; }

		}

		private bool _isExpandedOnce;

		public bool IsExpandedOnce

		{

			get { return _isExpandedOnce; }

			internal set { _isExpandedOnce = value; }

		}

		private bool _isExpanded;

		public bool IsExpanded

		{

			get { return _isExpanded; }

			set

			{

				if (value)

					Expand();

				else

					Collapse();

			}

		}

		internal void AssignIsExpanded(bool value)

		{

			_isExpanded = value;

		}

		private TreeNodeAdv _parent;

		public TreeNodeAdv Parent

		{

			get { return _parent; }

		}

		public int Level

		{

			get

			{

				if (_parent == null)

					return 0;

				else

					return _parent.Level + 1;

			}

		}

		public TreeNodeAdv PreviousNode

		{

			get

			{

				if (_parent != null)

				{

					int index = Index;

					if (index > 0)

						return _parent.Nodes[index - 1];

				}

				return null;

			}

		}

		public TreeNodeAdv NextNode

		{

			get

			{

				if (_parent != null)

				{

					int index = Index;

					if (index < _parent.Nodes.Count - 1)

						return _parent.Nodes[index + 1];

				}

				return null;

			}

		}

		internal TreeNodeAdv BottomNode

		{

			get

			{

				TreeNodeAdv parent = this.Parent;

				if (parent != null)

				{

					if (parent.NextNode != null)

						return parent.NextNode;

					else

						return parent.BottomNode;

				}

				return null;

			}

		}

		internal TreeNodeAdv NextVisibleNode

		{

			get

			{

				if (IsExpanded && Nodes.Count > 0)

					return Nodes[0];

				else

				{

					TreeNodeAdv nn = NextNode;

					if (nn != null)

						return nn;

					else

						return BottomNode;

				}

			}

		}

		public bool CanExpand

		{

			get

			{

				return (Nodes.Count > 0 || (!IsExpandedOnce && !IsLeaf));

			}

		}

		private object _tag;

		public object Tag

		{

			get { return _tag; }

		}

		private Collection<TreeNodeAdv> _nodes;

		internal Collection<TreeNodeAdv> Nodes

		{

			get { return _nodes; }

		}

		private ReadOnlyCollection<TreeNodeAdv> _children;

		public ReadOnlyCollection<TreeNodeAdv> Children

		{

			get

			{

				return _children;

			}

		}

		private int? _rightBounds;

		internal int? RightBounds

		{

			get { return _rightBounds; }

			set { _rightBounds = value; }

		}

		private int? _height;

		internal int? Height

		{

			get { return _height; }

			set { _height = value; }

		}

		private bool _isExpandingNow;

		internal bool IsExpandingNow

		{

			get { return _isExpandingNow; }

			set { _isExpandingNow = value; }

		}

		private bool _autoExpandOnStructureChanged = true;

		public bool AutoExpandOnStructureChanged

		{

			get { return _autoExpandOnStructureChanged; }

			set { _autoExpandOnStructureChanged = value; }

		}

		#endregion

		public TreeNodeAdv(object tag)

			: this(null, tag)

		{

		}

		internal TreeNodeAdv(TreeViewAdv tree, object tag)

		{

			_row = -1;

			_tree = tree;

			_nodes = new NodeCollection(this);

			_children = new ReadOnlyCollection<TreeNodeAdv>(_nodes);

			_tag = tag;

		}

		public override string ToString()

		{

			if (Tag != null)

				return Tag.ToString();

			else

				return base.ToString();

		}

		public void Collapse()

		{

			if (_isExpanded)

				Collapse(true);

		}

		public void CollapseAll()

		{

			Collapse(false);

		}

		public void Collapse(bool ignoreChildren)

		{

			SetIsExpanded(false, ignoreChildren);

		}

		public void Expand()

		{

			if (!_isExpanded)

				Expand(true);

		}

		public void ExpandAll()

		{

			Expand(false);

		}

		public void Expand(bool ignoreChildren)

		{

			SetIsExpanded(true, ignoreChildren);

		}

		private void SetIsExpanded(bool value, bool ignoreChildren)

		{

			if (Tree == null)

				_isExpanded = value;

			else

				Tree.SetIsExpanded(this, value, ignoreChildren);

		}

		#region ISerializable Members

		private TreeNodeAdv(SerializationInfo info, StreamingContext context)

			: this(null, null)

		{

			int nodesCount = 0;

			nodesCount = info.GetInt32("NodesCount");

			_isExpanded = info.GetBoolean("IsExpanded");

			_tag = info.GetValue("Tag", typeof(object));

			for (int i = 0; i < nodesCount; i++)

			{

				TreeNodeAdv child = (TreeNodeAdv)info.GetValue("Child" + i, typeof(TreeNodeAdv));

				Nodes.Add(child);

			}

		}

		[SecurityPermission(SecurityAction.Demand, SerializationFormatter = true)]

		public void GetObjectData(SerializationInfo info, StreamingContext context)

		{

			info.AddValue("IsExpanded", IsExpanded);

			info.AddValue("NodesCount", Nodes.Count);

			if ((Tag != null) && Tag.GetType().IsSerializable)

				info.AddValue("Tag", Tag, Tag.GetType());

			for (int i = 0; i < Nodes.Count; i++)

				info.AddValue("Child" + i, Nodes[i], typeof(TreeNodeAdv));

		}

		#endregion

	}

}