/*

   Version: MPL 1.1/GPL 2.0/LGPL 2.1

   The contents of this file are subject to the Mozilla Public License Version

   1.1 (the "License"); you may not use this file except in compliance with

   the License. You may obtain a copy of the License at

   http://www.mozilla.org/MPL/

   Software distributed under the License is distributed on an "AS IS" basis,

   WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License

   for the specific language governing rights and limitations under the License.

   The Original Code is the Open Hardware Monitor code.

   The Initial Developer of the Original Code is 

   Michael Möller <m.moeller@gmx.ch>.

   Portions created by the Initial Developer are Copyright (C) 2009-2010

   the Initial Developer. All Rights Reserved.

   Contributor(s):

   Alternatively, the contents of this file may be used under the terms of

   either the GNU General Public License Version 2 or later (the "GPL"), or

   the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),

   in which case the provisions of the GPL or the LGPL are applicable instead

   of those above. If you wish to allow use of your version of this file only

   under the terms of either the GPL or the LGPL, and not to allow others to

   use your version of this file under the terms of the MPL, indicate your

   decision by deleting the provisions above and replace them with the notice

   and other provisions required by the GPL or the LGPL. If you do not delete

   the provisions above, a recipient may use your version of this file under

   the terms of any one of the MPL, the GPL or the LGPL.

 */

 using System;

 using System.Collections;

 using System.Collections.Generic;

 using System.Collections.ObjectModel;

 using Aga.Controls.Tree;

 namespace OpenHardwareMonitor.GUI {

   public class TreeModel : ITreeModel {

     private Node root;

     private bool forceVisible = false;

     public TreeModel() {

       root = new Node();

       root.Model = this;

     }

     public TreePath GetPath(Node node) {

       if (node == root)

         return TreePath.Empty;

       else {

         Stack<object> stack = new Stack<object>();

         while (node != root) {

           stack.Push(node);

           node = node.Parent;

         }

         return new TreePath(stack.ToArray());

       }

     }

     public Collection<Node> Nodes {

       get { return root.Nodes; }

     }

     private Node GetNode(TreePath treePath) {

       Node parent = root;

       foreach (object obj in treePath.FullPath) {

         Node node = obj as Node;

         if (node == null || node.Parent != parent)

           return null;

         parent = node;

       }

       return parent;

     }

     public IEnumerable GetChildren(TreePath treePath) {

       Node node = GetNode(treePath);

       if (node != null) {

         foreach (Node n in node.Nodes)

           if (forceVisible || n.IsVisible)

             yield return n;

       } else {

         yield break;

       }

     }

     public bool IsLeaf(TreePath treePath) {

       return false;

     }

     public bool ForceVisible {

       get {

         return forceVisible;

       }

       set {

         if (value != forceVisible) {

           forceVisible = value;

           OnStructureChanged(root);

         }

       }

     }

     #pragma warning disable 67

     public event EventHandler<TreeModelEventArgs> NodesChanged;

     public event EventHandler<TreePathEventArgs> StructureChanged;

     public event EventHandler<TreeModelEventArgs> NodesInserted;

     public event EventHandler<TreeModelEventArgs> NodesRemoved;

     #pragma warning restore 67

     public void OnNodeChanged(Node parent, int index, Node node) {

       if (NodesChanged != null && parent != null) {

         TreePath path = GetPath(parent);

         if (path != null) 

           NodesChanged(this, new TreeModelEventArgs(

             path, new int[] { index }, new object[] { node }));

       }

     }

     public void OnStructureChanged(Node node) {

       if (StructureChanged != null)

         StructureChanged(this,

           new TreeModelEventArgs(GetPath(node), new object[0]));

     }

     public void OnNodeInserted(Node parent, int index, Node node) {

       if (NodesInserted != null) {

         TreeModelEventArgs args = new TreeModelEventArgs(GetPath(parent),

           new int[] { index }, new object[] { node });

         NodesInserted(this, args);

       }

     }

     public void OnNodeRemoved(Node parent, int index, Node node) {

       if (NodesRemoved != null) {

         TreeModelEventArgs args = new TreeModelEventArgs(GetPath(parent), 

           new int[] { index }, new object[] { node });

         NodesRemoved(this, args);

       }

     }

   }

 }