// Copyright 2016 David Galles, University of San Francisco. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other materials
// provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY David Galles ``AS IS'' AND ANY EXPRESS OR IMPLIED
// WARRANTIES, INCLUDING, BUT NOT LIIBTED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
// FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> OR
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
// ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// The views and conclusions contained in the software and documentation are those of the
// authors and should not be interpreted as representing official policies, either expressed
// or implied, of the University of San Francisco


// Constants.


Ternary.NODE_WIDTH = 30;

Ternary.CENTER_LINK_COLOR = "#007700";
Ternary.SIDE_LINK_COLOR = "#8888AA";
Ternary.HIGHLIGHT_CIRCLE_COLOR = "#007700";
Ternary.FOREGROUND_COLOR = "#007700";
Ternary.BACKGROUND_COLOR = "#CCFFCC";
Ternary.TRUE_COLOR = "#CCFFCC";
Ternary.PRINT_COLOR = Ternary.FOREGROUND_COLOR;
Ternary.FALSE_COLOR = "#FFFFFF"
Ternary.WIDTH_DELTA  = 50;
Ternary.HEIGHT_DELTA = 50;
Ternary.STARTING_Y = 20;
Ternary.LeftMargin = 300;
Ternary.NEW_NODE_Y = 100
Ternary.NEW_NODE_X = 50;
Ternary.FIRST_PRINT_POS_X  = 50;
Ternary.PRINT_VERTICAL_GAP  = 20;
Ternary.PRINT_HORIZONTAL_GAP = 50;
    


function Ternary(am, w, h)
{
        this.init(am, w, h);
}

Ternary.prototype = new Algorithm();
Ternary.prototype.constructor = Ternary;
Ternary.superclass = Algorithm.prototype;

Ternary.prototype.init = function(am, w, h)
{
    var sc = Ternary.superclass;
    this.startingX =  w / 2;
    this.first_print_pos_y  = h - 2 * Ternary.PRINT_VERTICAL_GAP;
    this.print_max  = w - 10;
    
    var fn = sc.init;
    fn.call(this,am);
    this.addControls();
    this.nextIndex = 0;
    this.commands = [];
    this.cmd("CreateLabel", 0, "", 20, 10, 0);
    this.cmd("CreateLabel", 1, "", 20, 10, 0);
    this.cmd("CreateLabel", 2, "", 20, 30, 0);
    this.nextIndex = 3;
    this.root = null;
    this.animationManager.StartNewAnimation(this.commands);
    this.animationManager.skipForward();
    this.animationManager.clearHistory();
}


Ternary.prototype.addControls =  function()
{
    this.insertField = addControlToAlgorithmBar("Text", "");
    this.insertField.onkeypress = this.returnSubmit(this.insertField,  this.insertCallback.bind(this), 12,false);
    this.insertButton = addControlToAlgorithmBar("Button", "添加");
    this.insertButton.onclick = this.insertCallback.bind(this);
    this.deleteField = addControlToAlgorithmBar("Text", "");
    this.deleteField.onkeydown = this.returnSubmit(this.deleteField,  this.deleteCallback.bind(this), 12);
    this.deleteButton = addControlToAlgorithmBar("Button", "删除");
    this.deleteButton.onclick = this.deleteCallback.bind(this);
    this.findField = addControlToAlgorithmBar("Text", "");
    this.findField.onkeydown = this.returnSubmit(this.findField,  this.findCallback.bind(this), 12);
    this.findButton = addControlToAlgorithmBar("Button", "搜索");
    this.findButton.onclick = this.findCallback.bind(this);
    this.printButton = addControlToAlgorithmBar("Button", "打印");
    this.printButton.onclick = this.printCallback.bind(this);
}

Ternary.prototype.reset = function()
{
    this.nextIndex = 3;
    this.root = null;
}

Ternary.prototype.insertCallback = function(event)
{
    var insertedValue = this.insertField.value.toUpperCase()
    insertedValue = insertedValue.replace(/[^a-z]/gi,'');
    
    if (insertedValue != "")
    {
        // set text value
        this.insertField.value = "";
        this.implementAction(this.add.bind(this), insertedValue);
    }
}


Ternary.prototype.deleteCallback = function(event)
{
    var deletedValue = this.deleteField.value.toUpperCase();
    deletedValue = deletedValue.replace(/[^a-z]/gi,'');
    if (deletedValue != "")
    {
        this.deleteField.value = "";
        this.implementAction(this.deleteElement.bind(this),deletedValue);               
    }
    
}


Ternary.prototype.cleanupAfterDelete = function(tree)
{
    if (tree == null)
    {
        return;
    }
    else if (tree.center != null)
    {
        this.cmd("SetHighlight", tree.graphicID, 1);
        this.cmd("SetText", 2, "Clerning up after delete ...\nTree has center child, no more cleanup required");
        this.cmd("step");
        this.cmd("SetText", 2, "");
        this.cmd("SetHighlight", tree.graphicID, 0);
        return;
    } 
    else if (tree.center == null && tree.right == null && tree.left == null && tree.isword == true)
    {
        this.cmd("SetHighlight", tree.graphicID, 1);
        this.cmd("SetText", 2, "Clerning up after delete ...\nLeaf at end of word, no more cleanup required");
        this.cmd("step");
        this.cmd("SetText", 2, "");
        this.cmd("SetHighlight", tree.graphicID, 0);
        return;
    }
    else if (tree.center == null && tree.left == null && tree.right == null)
    {
        this.cmd("SetText", 2, "Clearning up after delete ...");
        this.cmd("SetHighlight", tree.graphicID, 1);
        this.cmd("step");
        this.cmd("Delete", tree.graphicID);
        if (tree.parent == null)
        {
            this.root = null;
        }
        else if (tree.parent.left == tree)
        {
            this.cmd("Disconnect", tree.parent.graphicID, tree.graphicID);
            tree.parent.left = null;
        }
        else if (tree.parent.right == tree)
        {
            this.cmd("Disconnect", tree.parent.graphicID, tree.graphicID);
            tree.parent.right = null;
        }
        else if (tree.parent.center == tree)
        {
            this.cmd("Disconnect", tree.parent.graphicID, tree.graphicID);
            tree.parent.center = null;
            tree.parent.charAt = " ";
            this.cmd("SetText", tree.parent.graphicID, " ");
        }
        this.cleanupAfterDelete(tree.parent);
    }
    else if ((tree.left == null && tree.center == null)  || (tree.right == null && tree.center == null)) 
    {
	var child = null
	if (tree.left != null)
	    child = tree.left
	else
	    child = tree.right;
        this.cmd("Disconnect", tree.graphicID, child.graphicID);
        if (tree.parent == null)
        {
	    this.cmd("Delete", tree.graphicID);
            this.root = child;
        }
        else if (tree.parent.left == tree) 
        {
            this.cmd("Disconnect", tree.parent.graphicID, tree.graphicID);
            this.cmd("Connect", tree.parent.graphicID, child.graphicID, Ternary.SIDE_LINK_COLOR, 0.0001, false, "<" + tree.parent.nextChar)
	    tree.parent.left = child;
	    child.parent = tree.parent;
	    this.cmd("Step");
	    this.cmd("Delete", tree.graphicID);
        }
	else if (tree.parent.right == tree)
	{
            this.cmd("Disconnect", tree.parent.graphicID, tree.graphicID);
            this.cmd("Connect", tree.parent.graphicID, child.graphicID, Ternary.SIDE_LINK_COLOR, -0.0001, false, ">" + tree.parent.nextChar)
	    tree.parent.right = child;
	    child.parent = tree.parent;
	    this.cmd("Step");
	    this.cmd("Delete", tree.graphicID);
	}
	else if (tree.parent.center == tree)
	{
            this.cmd("Disconnect", tree.parent.graphicID, tree.graphicID);
            this.cmd("Connect", tree.parent.graphicID, child.graphicID, Ternary.CENTER_LINK_COLOR, 0.0001, false, "=" + tree.parent.nextChar)
	    child.parent = tree.parent;
	    tree.parent.center = child;
	    this.cmd("Step");
	    this.cmd("Delete", tree.graphicID);
	}
	else
	{
	    throw("What??")
	}
    }
    else if (tree.right != null && tree.center == null && tree.right != null)
    {
	var node = tree.left;

	var parent = tree.parent;
        this.cmd("CreateHighlightCircle", this.highlightID, Ternary.HIGHLIGHT_CIRCLE_COLOR, tree.x, tree.y);
	this.cmd("SetWidth", this.highlightID, Ternary.NODE_WIDTH);
        this.cmd("Move", this.highlightID, node.x, node.y);
        this.cmd("Step")
	while (node.right != null)
	{
	    node = node.right;
            this.cmd("Move", this.highlightID, node.x, node.y);
            this.cmd("Step")
	}
	if (tree.left != node)
	{
            this.cmd("Disconnect", node.parent.graphicID, node.graphicID);
	    node.parent.right = node.left;
	    if (node.left != null)
	    {
		node.left.parent = node.parent;
		this.cmd("Disconnect", node.graphicID, node.left.graphicID);
		this.cmd("Connect", node.parent.graphicID, node.left.graphicID, Ternary.CENTER_LINK_COLOR, -0.0001, false, ">" + node.parent.nextChar)
	    }
	    this.cmd("Disconnect", tree.graphicID, tree.right.graphicID);
	    this.cmd("Disconnect", tree.graphicID, tree.left.graphicID);
	    node.right = tree.right;
	    node.left = tree.left;
	    tree.right.parent = node;
	    tree.left.parent = node;
   	    this.cmd("Connect", node.graphicID, node.left.graphicID, Ternary.SIDE_LINK_COLOR, 0.0001, false, "<" + node.nextChar)
   	    this.cmd("Connect", node.graphicID, node.right.graphicID, Ternary.SIDE_LINK_COLOR, -0.0001, false, ">" + node.nextChar)
	    
	}
	else
	{
	    this.cmd("Disconnect", tree.graphicID, tree.left.graphicID);
	    this.cmd("Disconnect", tree.graphicID, tree.right.graphicID);
	    node.right = tree.right;
	    node.right.parent = node;
   	    this.cmd("Connect", node.graphicID, node.right.graphicID, Ternary.SIDE_LINK_COLOR, -0.0001, false, ">" + node.nextChar)
	}
        this.cmd("Delete", this.highlightID);
        this.cmd("Delete", tree.graphicID);
	this.cmd("Step");
	node.parent = tree.parent;
	if (node.parent == null)
	{
	    this.root = node;
	}
	else
	{
	    this.cmd("Disconnect", tree.parent.graphicID, tree.graphicID);
	    if (tree.parent.left == tree)
	    {
		tree.parent.left = node;
		node.parent = tree.parent;
   		this.cmd("Connect", node.parent.graphicID, node.graphicID, Ternary.SIDE_LINK_COLOR, 0.0001, false, "<" + node.parent.nextChar)

	    }
	    else if (tree.parent.right == tree)
	    {
		tree.parent.right = node;
		node.parent = tree.parent;
   		this.cmd("Connect", node.parent.graphicID, node.graphicID, Ternary.SIDE_LINK_COLOR, -0.0001, false, ">" + node.parent.nextChar)

	    }
	    else if (tree.parent.center == tree)
	    {
		tree.parent.center = node;
		node.parent = tree.parent;
   		this.cmd("Connect", node.parent.graphicID, node.graphicID, Ternary.CENTER_LINK_COLOR, 0.0001, false, "=" + node.parent.nextChar)
		
	    }
	    else
	    {


	    }
	    
	}
    
    }
}


Ternary.prototype.deleteElement = function(word)
{
    this.commands = [];
    this.cmd("SetText", 0, "正在刪除： ");
    this.cmd("SetText", 1, "\"" + word  + "\"");
    this.cmd("AlignRight", 1, 0);
    this.cmd("Step");
    
    
    var node = this.doFind(this.root, word);
    if (node != null)
    {
        this.cmd("SetHighlight", node.graphicID , 1);
            this.cmd("SetText", 2, "Found \""+word+"\", setting value in tree to False");
        this.cmd("step")
        this.cmd("SetBackgroundColor", node.graphicID, Ternary.FALSE_COLOR);
        node.isword = false
        this.cmd("SetHighlight", node.graphicID , 0);
        this.cleanupAfterDelete(node)
        this.resizeTree()
    }
    else
    {
        this.cmd("SetText", 2, "\""+word+"\" not in tree, nothing to delete");
        this.cmd("step")
        this.cmd("SetHighlightIndex", 1,  -1)
    }
    
    
    
    this.cmd("SetText", 0, "");
    this.cmd("SetText", 1, "");
    this.cmd("SetText", 2, "");
    return this.commands;                                           
}



Ternary.prototype.printCallback = function(event)
{
        this.implementAction(this.printTree.bind(this),"");                                             
}


Ternary.prototype.printTree = function(unused)
{

	this.commands = [];
    
	if (this.root != null)
	{
		this.highlightID = this.nextIndex++;
	        this.printLabel1 = this.nextIndex++;
	        this.printLabel2 = this.nextIndex++;
		var firstLabel = this.nextIndex++;
	        this.cmd("CreateLabel", firstLabel, "Output: ", Ternary.FIRST_PRINT_POS_X, this.first_print_pos_y);
		this.cmd("CreateHighlightCircle", this.highlightID, Ternary.HIGHLIGHT_CIRCLE_COLOR, this.root.x, this.root.y);
                this.cmd("SetWidth", this.highlightID, Ternary.NODE_WIDTH);
	        this.cmd("CreateLabel", this.printLabel1, "Current String: ", 20, 10, 0);
	        this.cmd("CreateLabel", this.printLabel2, "", 20, 10, 0);
	        this.cmd("AlignRight", this.printLabel2, this.printLabel1);
		this.xPosOfNextLabel = Ternary.FIRST_PRINT_POS_X;
		this.yPosOfNextLabel = this.first_print_pos_y;
		this.printTreeRec(this.root, "");

//	        this.cmd("SetText", this.printLabel1, "About to delete");
//		this.cmd("Step")

		this.cmd("Delete",  this.highlightID);
		this.cmd("Delete",  this.printLabel1);
		this.cmd("Delete",  this.printLabel2);
		this.cmd("Step")
		
		for (var i = firstLabel; i < this.nextIndex; i++)
		{
			this.cmd("Delete", i);
		}
		this.nextIndex = this.highlightID;  /// Reuse objects.  Not necessary.
	}
	return this.commands;


}

Ternary.prototype.printTreeRec = function(tree, stringSoFar)
{
    if (tree.isword)
    {
	var nextLabelID = this.nextIndex++;
        this.cmd("CreateLabel", nextLabelID, stringSoFar + "  ", 20, 10, 0);
	this.cmd("SetForegroundColor", nextLabelID, Ternary.PRINT_COLOR); 
	this.cmd("AlignRight", nextLabelID, this.printLabel1, Ternary.PRINT_COLOR); 
	this.cmd("MoveToAlignRight", nextLabelID, nextLabelID - 1);
	this.cmd("Step");
	
	this.xPosOfNextLabel +=  Ternary.PRINT_HORIZONTAL_GAP;
	if (this.xPosOfNextLabel > this.print_max)
	{
		this.xPosOfNextLabel = Ternary.FIRST_PRINT_POS_X;
		this.yPosOfNextLabel += Ternrary.PRINT_VERTICAL_GAP;
	}
	

    }
    if (tree.left != null)
    {
	this.cmd("Move", this.highlightID, tree.left.x, tree.left.y);
	this.cmd("Step");
	this.printTreeRec(tree.left, stringSoFar);
	this.cmd("Move", this.highlightID, tree.x, tree.y);
	this.cmd("Step");


    }
    if (tree.center != null)
    {
	var nextLabelID = this.nextIndex;
        this.cmd("CreateLabel", nextLabelID, tree.nextChar, tree.x, tree.y, 0);
	this.cmd("MoveToAlignRight", nextLabelID, this.printLabel2);

	this.cmd("Move", this.highlightID, tree.center.x, tree.center.y);
	this.cmd("Step");
	this.cmd("Delete", nextLabelID);
	this.cmd("SetText", this.printLabel2, stringSoFar + tree.nextChar);
	this.printTreeRec(tree.center, stringSoFar + tree.nextChar);
	this.cmd("Move", this.highlightID, tree.x, tree.y);
	this.cmd("SetText", this.printLabel2, stringSoFar);
	this.cmd("Step");


    }
    if (tree.right != null)
    {
	this.cmd("Move", this.highlightID, tree.right.x, tree.right.y);
	this.cmd("Step");
	this.printTreeRec(tree.right, stringSoFar);
	this.cmd("Move", this.highlightID, tree.x, tree.y);
	this.cmd("Step");
    }
}

Ternary.prototype.findCallback = function(event)
{
        var findValue = this.findField.value.toUpperCase()
        finndValue = findValue.replace(/[^a-z]/gi,'');
        this.findField.value = "";
        this.implementAction(this.findElement.bind(this),findValue);                                            
}

Ternary.prototype.findElement = function(word)
{
    this.commands = [];
    
    this.commands = new Array();    
    this.cmd("SetText", 0, "正在搜索： ");
    this.cmd("SetText", 1, "\"" + word  + "\"");
    this.cmd("AlignRight", 1, 0);
    this.cmd("Step");
    
    
    var node = this.doFind(this.root, word);
    if (node != null)
    {
        this.cmd("SetText", 0, "Found \""+word+"\"");
    }
    else
    {
        this.cmd("SetText", 0, "\""+word+"\" not Found");
    }
    
    this.cmd("SetText", 1, "");
    this.cmd("SetText", 2, "");
    
    return this.commands;
}


Ternary.prototype.doFind = function(tree, s)
{

    if (tree == null)
    {
        this.cmd("SetText", 2, "Reached null tree\nWord is not in the tree");
        this.cmd("Step");
        return null;
    }
    this.cmd("SetHighlight", tree.graphicID , 1);

    if (s.length == 0)
    {
        if (tree.isword == true)
        {
            this.cmd("SetText", 2, "Reached the end of the string \nCurrent node is True\nWord is in the tree");
            this.cmd("Step");
            this.cmd("SetHighlight", tree.graphicID , 0);
            return tree
        }
        else
        {
            this.cmd("SetText", 2, "Reached the end of the string \nCurrent node is False\nWord is Not the tree");
            this.cmd("Step");
            this.cmd("SetHighlight", tree.graphicID , 0);
            return null

        }
    }
    else 
    {
        this.cmd("SetHighlightIndex", 1, 1);

        var child = null;
        if (tree.nextChar == " ")
        {
           this.cmd("SetText", 2, "Reached a leaf without a character, still have characeters left in search string \nString is not in the tree");
           this.cmd("Step");
           this.cmd("SetHighlightIndex", 1, -1);
           this.cmd("SetHighlight", tree.graphicID , 0);
           return null;
        }

        if (tree.nextChar == s.charAt(0))
        {
           this.cmd("SetText", 2, "Next character in string  matches character at current node\nRecursively look at center child, \nremoving first letter from search string");
           this.cmd("Step");
           s = s.substring(1);
           child = tree.center;
        }
        else if (tree.nextChar > s.charAt(0))
        {
           this.cmd("SetText", 2, "Next character in string < Character at current node\nRecursively look at left node, \nleaving search string as it is");
           this.cmd("Step");
           child = tree.left;
        }
        else
        {
           this.cmd("SetText", 2, "Next character in string > Character at current node\nRecursively look at left right, \nleaving search string as it is");
           this.cmd("Step");
           child = tree.right;
        }
        if (child != null)
        {
           this.cmd("SetText", 1, "\""+s+"\"");
           this.cmd("SetHighlightIndex", 1, -1);

           this.cmd("CreateHighlightCircle", this.highlightID, Ternary.HIGHLIGHT_CIRCLE_COLOR, tree.x, tree.y);
           this.cmd("SetWidth", this.highlightID, Ternary.NODE_WIDTH);
           this.cmd("SetHighlight", tree.graphicID , 0);

           this.cmd("Move", this.highlightID, child.x, child.y);
           this.cmd("Step")
           this.cmd("Delete", this.highlightID);

        }
        else
        {
            this.cmd("SetHighlight", tree.graphicID , 0);
        }
        return this.doFind(child, s)
    }
}

Ternary.prototype.insertElement = function(insertedValue)
{
    this.cmd("SetText", 0, "");                             
    return this.commands;
}


Ternary.prototype.insert = function(elem, tree)
{
        
}



Ternary.prototype.resizeTree = function()
{
    this.resizeWidths(this.root);
    if (this.root != null)
    {
	var startingPoint = Ternary.LeftMargin;
	if (this.root.left == null)
	{
	    startingPoint += Ternary.NODE_WIDTH / 2;
	}
	else
	{
	    startingPoint += this.root.left.width;
	}
	    
//        var startingPoint = this.root.width / 2 + 1 + Ternary.LeftMargin;
        this.setNewPositions(this.root, startingPoint, Ternary.STARTING_Y);
        this.animateNewPositions(this.root);
        this.cmd("Step");
    }
    
}


Ternary.prototype.add = function(word) 
{
    this.commands = new Array();    
    this.cmd("SetText", 0, "Inserting; ");
    this.cmd("SetText", 1, "\"" + word  + "\"");
    this.cmd("AlignRight", 1, 0);
    this.cmd("Step");
    if (this.root == null)
    {
        this.cmd("CreateCircle", this.nextIndex, " ", Ternary.NEW_NODE_X, Ternary.NEW_NODE_Y); 
        this.cmd("SetForegroundColor", this.nextIndex, Ternary.FOREGROUND_COLOR);
        this.cmd("SetBackgroundColor", this.nextIndex, Ternary.FALSE_COLOR);
        this.cmd("SetWidth", this.nextIndex, Ternary.NODE_WIDTH);
        this.cmd("SetText", 2, "Creating a new root");
        this.root = new TernaryNode(" ", this.nextIndex, Ternary.NEW_NODE_X, Ternary.NEW_NODE_Y)
        this.cmd("Step");                               
        this.resizeTree();
        this.cmd("SetText", 2, "" );
        this.nextIndex += 1;
        this.highlightID = this.nextIndex++;
        
    }
    this.addR(word.toUpperCase(), this.root);
    this.cmd("SetText", 0, "");
    this.cmd("SetText", 1, "");
    this.cmd("SetText", 2, "");
    
    return this.commands;
}


Ternary.prototype.createIfNotExtant = function (tree, child, label)
{
    if (child == null)
    {
        this.cmd("CreateCircle", this.nextIndex, " ", Ternary.NEW_NODE_X, Ternary.NEW_NODE_Y); 
        this.cmd("SetForegroundColor", this.nextIndex, Ternary.FOREGROUND_COLOR);
        this.cmd("SetBackgroundColor", this.nextIndex, Ternary.FALSE_COLOR);
        this.cmd("SetWidth", this.nextIndex, Ternary.NODE_WIDTH);
        this.cmd("SetText", 2, "Creating a new node");
        child = new TernaryNode(" ", this.nextIndex, Ternary.NEW_NODE_X, Ternary.NEW_NODE_Y)
        this.cmd("Step");
        var dir = 0.0001;
        if (label.charAt(0) == '>')
        {
            dir = -0.0001

        }
        var color = Ternary.FOREGROUND_COLOR;
        if (label.charAt(0) == "=")
        {
            color = Ternary.CENTER_LINK_COLOR;
        }
        else
        {
            color = Ternary.SIDE_LINK_COLOR;
        }
        this.cmd("Connect", tree.graphicID, this.nextIndex, color, dir, false, label)
        this.cmd("SetText", 2, "" );
        this.nextIndex++;
        this.highlightID = this.nextIndex++;
        
    }
    return child;
}


Ternary.prototype.addR = function(s, tree)
{
    this.cmd("SetHighlight", tree.graphicID , 1);

    if (s.length == 0)
    {
            this.cmd("SetText", 2, "Reached the end of the string \nSet current node to true");
            this.cmd("Step");
            this.cmd("SetBackgroundColor", tree.graphicID, Ternary.TRUE_COLOR);
            this.cmd("SetHighlight", tree.graphicID , 0);
            tree.isword = true;
            return;
    }
    else 
    {
       this.cmd("SetHighlightIndex", 1, 1);
       if (tree.nextChar == ' ')
       {
           tree.nextChar = s.charAt(0);
           this.cmd("SetText", 2, "No character for this node, setting to " + s.charAt(0));
           this.cmd("SetText", tree.graphicID, s.charAt(0));
           this.cmd("Step");
           if (tree.center == null)
           {
               tree.center = this.createIfNotExtant(tree, tree.center, "="+s.charAt(0));
               tree.center.parent = tree;
               this.resizeTree();
               
           }
           this.cmd("SetHighlightIndex", 1, -1);
           this.cmd("SetHighlight", tree.graphicID , 0);
           this.cmd("SetText", 1, "\"" + s.substring(1) + "\"");

           this.cmd("CreateHighlightCircle", this.highlightID, Ternary.HIGHLIGHT_CIRCLE_COLOR, tree.x, tree.y);
           this.cmd("SetWidth", this.highlightID, Ternary.NODE_WIDTH);
           this.cmd("Move", this.highlightID, tree.center.x, tree.center.y);
           this.cmd("Step")
           this.cmd("Delete", this.highlightID);

           this.addR(s.substring(1), tree.center)
       }
       else if (tree.nextChar == s.charAt(0))
       {
           this.cmd("CreateHighlightCircle", this.highlightID, Ternary.HIGHLIGHT_CIRCLE_COLOR, tree.x, tree.y);
           this.cmd("SetWidth", this.highlightID, Ternary.NODE_WIDTH);
           this.cmd("SetText", 2, "Making recursive call to center child, passing in \"" + s.substring(1) + "\"");
           this.cmd("Step")
           this.cmd("SetHighlight", tree.graphicID , 0);
           this.cmd("SetHighlightIndex", 1, -1);
           this.cmd("SetText", 1, "\"" + s.substring(1) + "\"");
           this.cmd("Move", this.highlightID, tree.center.x, tree.center.y);
           this.cmd("Step")
           this.cmd("Delete", this.highlightID);
           this.addR(s.substring(1), tree.center)
       }
       else 
	{
	    var child = null;
	    var label = "";
	    if (tree.nextChar > s.charAt(0))
	    {
		label = "<" + tree.nextChar;
		this.cmd("SetText", 2, "Next character in stirng is < value stored at current node \n Making recursive call to left child passing in \"" + s+ "\"");
		tree.left = this.createIfNotExtant(tree, tree.left, label);
		tree.left.parent = tree;
 	        this.resizeTree();
		child = tree.left;
	    }
	    else
	    {
		label = ">" + tree.nextChar;
		this.cmd("SetText", 2, "Next character in stirng is > value stored at current node \n Making recursive call to right child passing in \"" + s + "\"");
		tree.right= this.createIfNotExtant(tree, tree.right, label);
		tree.right.parent = tree;
		child = tree.right;
 	        this.resizeTree();

	    }
 	    this.cmd("CreateHighlightCircle", this.highlightID, Ternary.HIGHLIGHT_CIRCLE_COLOR, tree.x, tree.y);
            this.cmd("SetWidth", this.highlightID, Ternary.NODE_WIDTH);
            this.cmd("Step")
            this.cmd("SetHighlight", tree.graphicID , 0);
            this.cmd("SetHighlightIndex", 1, -1);
//            this.cmd("SetText", 1, "\"" + s.substring(1) + "\"");

            this.cmd("Move", this.highlightID, child.x, child.y);
            this.cmd("Step")
 	    this.cmd("Delete", this.highlightID);
	    this.addR(s, child)
	}
    }
}
Ternary.prototype.setNewPositions = function(tree, xLeft, yPosition)
{
	if (tree != null)
	{
            tree.x = xLeft + Ternary.NODE_WIDTH / 2;
   	    tree.y = yPosition;
	    var newYPos = yPosition + Ternary.HEIGHT_DELTA;
	    if (tree.left != null)
            {
		this.setNewPositions(tree.left, xLeft, newYPos);
	    }
	    if (tree.center != null)
            {
		this.setNewPositions(tree.center, xLeft + tree.leftWidth, newYPos);
		tree.x = tree.center.x;
            }
	    if (tree.right != null)
            {
		this.setNewPositions(tree.right, xLeft + tree.leftWidth +  tree.centerWidth, newYPos);
            }
	    
	}
	
}
Ternary.prototype.animateNewPositions = function(tree)
{
	if (tree != null)
	{
		this.cmd("Move", tree.graphicID, tree.x, tree.y);
                this.animateNewPositions(tree.left)
                this.animateNewPositions(tree.center)
                this.animateNewPositions(tree.right)

	}
}

Ternary.prototype.resizeWidths = function(tree) 
{
	if (tree == null)
	{
		return 0;
	}
        tree.leftWidth = (this.resizeWidths(tree.left));
        tree.centerWidth = (this.resizeWidths(tree.center));
        tree.rightWidth = (this.resizeWidths(tree.right));
        tree.width = Math.max(tree.leftWidth + tree.centerWidth+tree.rightWidth, Ternary.NODE_WIDTH  + 4);
        return tree.width;
}




function TernaryNode(val, id, initialX, initialY)
{
    this.nextChar = val;
    this.x = initialX;
    this.y = initialY;
    this.graphicID = id;
    
    this.left = null;
    this.center = null;
    this.right = null;
    this.leftWidth =  0;
    this.centerWidth =  0;
    this.rightWwidth =  0;
    this.parent = null;
}

Ternary.prototype.disableUI = function(event)
{
    this.insertField.disabled = true;
    this.insertButton.disabled = true;
    this.deleteField.disabled = true;
    this.deleteButton.disabled = true;
    this.findField.disabled = true;
    this.findButton.disabled = true;
    this.printButton.disabled = true;
}

Ternary.prototype.enableUI = function(event)
{
    this.insertField.disabled = false;
    this.insertButton.disabled = false;
    this.deleteField.disabled = false;
    this.deleteButton.disabled = false;
    this.findField.disabled = false;
    this.findButton.disabled = false;
    this.printButton.disabled = false;
}


var currentAlg;

function init()
{
    var animManag = initCanvas();
    currentAlg = new Ternary(animManag, canvas.width, canvas.height);    
}