// 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.


RadixTree.NODE_WIDTH = 60;

RadixTree.LINK_COLOR = "#007700";
RadixTree.HIGHLIGHT_CIRCLE_COLOR = "#007700";
RadixTree.FOREGROUND_COLOR = "#007700";
RadixTree.BACKGROUND_COLOR = "#CCFFCC";
RadixTree.PRINT_COLOR = RadixTree.FOREGROUND_COLOR;
RadixTree.FALSE_COLOR = "#FFFFFF"
RadixTree.WIDTH_DELTA = 50;
RadixTree.HEIGHT_DELTA = 80;
RadixTree.STARTING_Y = 80;
RadixTree.LeftMargin = 300;
RadixTree.NEW_NODE_Y = 100
RadixTree.NEW_NODE_X = 50;
RadixTree.FIRST_PRINT_POS_X = 50;
RadixTree.PRINT_VERTICAL_GAP = 20;
RadixTree.PRINT_HORIZONTAL_GAP = 50;
 


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

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

RadixTree.prototype.init = function(am, w, h)
{
	var sc = RadixTree.superclass;
	this.startingX = w / 2;
	this.first_print_pos_y = h - 2 * RadixTree.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.animationManager.StartNewAnimation(this.commands);
	this.animationManager.skipForward();
	this.animationManager.clearHistory();
}



RadixTree.prototype.findIndexDifference = function(s1, s2, id, wordIndex)
{
 var index = 0;
 this.cmd("SetText", 2, "Comparing next letter in search term \n to next letter in prefix of current node");
 
 while (index < s1.length && index < s2.length)
 {
 this.cmd("SetHighlightIndex", 1, index);
 this.cmd("SetHighlightIndex", id, index);
	 this.cmd("Step");
 this.cmd("SetHighlightIndex", 1, -1);
 this.cmd("SetHighlightIndex", id, -1);

 if (s1.charAt(index) == s2.charAt(index))
 {
 index++;
 }
	 else
 {
 break;
 }
 }
 return index;
}


RadixTree.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);
}

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

RadixTree.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);
	}
}

RadixTree.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);		
	}
}


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



RadixTree.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: ", RadixTree.FIRST_PRINT_POS_X, this.first_print_pos_y);
		this.cmd("CreateHighlightCircle", this.highlightID, RadixTree.HIGHLIGHT_CIRCLE_COLOR, this.root.x, this.root.y);
 this.cmd("SetWidth", this.highlightID, RadixTree.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 = RadixTree.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;

}




RadixTree.prototype.printTreeRec = function(tree, stringSoFar)
{
 if (tree.wordRemainder != "")
 {
	stringSoFar = stringSoFar + tree.wordRemainder;
	var nextLabelID = this.nextIndex++;
 this.cmd("CreateLabel", nextLabelID, tree.wordRemainder, tree.x, tree.y, 0);
	this.cmd("MoveToAlignRight", nextLabelID, this.printLabel2);
	this.cmd("Step");
	this.cmd("Delete", nextLabelID);
	this.nextIndex--;
	this.cmd("SetText", this.printLabel2, stringSoFar);
 }
 if (tree.isword)
 {
	var nextLabelID = this.nextIndex++;
 this.cmd("CreateLabel", nextLabelID, stringSoFar + "", 20, 10, 0);
	this.cmd("SetForegroundColor", nextLabelID, RadixTree.PRINT_COLOR); 
	this.cmd("AlignRight", nextLabelID, this.printLabel1, RadixTree.PRINT_COLOR); 
	this.cmd("MoveToAlignRight", nextLabelID, nextLabelID - 1);
	this.cmd("Step");
	
	this.xPosOfNextLabel += RadixTree.PRINT_HORIZONTAL_GAP;
	if (this.xPosOfNextLabel > this.print_max)
	{
		this.xPosOfNextLabel = RadixTree.FIRST_PRINT_POS_X;
		this.yPosOfNextLabel += RadixTree.PRINT_VERTICAL_GAP;
	}
	

 }
 for (var i = 0; i < 26; i++)
 {
	if (tree.children[i] != null)
	{
	this.cmd("Move", this.highlightID, tree.children[i].x, tree.children[i].y);
	this.cmd("Step");
	this.printTreeRec(tree.children[i], stringSoFar);
	this.cmd("Move", this.highlightID, tree.x, tree.y);
	this.cmd("SetText", this.printLabel2, stringSoFar);
	this.cmd("Step");
	 
	}
	
	
 }
}

RadixTree.prototype.findCallback = function(event)
{
	var findValue;

	var findValue = this.insertField.value.toUpperCase()
 findValue = findValue.replace(/[^a-z]/gi,'');
	this.findField.value = "";

	this.implementAction(this.findElement.bind(this),findValue);						
}

RadixTree.prototype.findElement = function(findValue)
{
	this.commands = [];
	this.cmd("SetText", 0, "Seaching for: ");
	this.cmd("SetText", 1, findValue);
 this.cmd("AlignRight", 1, 0);
 this.cmd("Step");
 this.highlightID = this.nextIndex++;
	

	var res = this.doFind(this.root, findValue);
	if (res)
 {
 	 this.cmd("SetText", 0, "String " + findValue + " found");
 }
 else
 {
 	 this.cmd("SetText", 0, "String " + findValue + " 未找到");
 }
 this.cmd("SetText", 1, "");
 this.cmd("SetText", 2, "");
 
	
	return this.commands;
}


RadixTree.prototype.doFind = function(tree, value)
{
 if (tree == null)
 {
 this.cmd("SetText", 2, "Empty tree found. String not in the tree");
 this.cmd("step");
 return null;
 }

 this.cmd("SetHighlight", tree.graphicID , 1);

 var remain = tree.wordRemainder
 
 var indexDifference = this.findIndexDifference(value, remain, tree.graphicID, 0);

 if (indexDifference == remain.length)
 {
 this.cmd("SetText", 2, "Reached the end of the prefix stored at this node");
 this.cmd("Step");

 if (value.length > indexDifference)
 { 
		this.cmd("SetText", 2, "Recusively search remaining string \nin the '" +value.charAt(indexDifference) + "' child");
 this.cmd("Step");
 this.cmd("SetHighlight", tree.graphicID , 0);
		this.cmd("SetText", 1, value.substring(indexDifference));

 var index = value.charCodeAt(indexDifference) - "A".charCodeAt(0);
		var noChild = tree.children[index] == null;


		if (noChild)
 {
 		 this.cmd("SetText", 2, "Child '" +value.charAt(indexDifference) + "' does not exit. \nString is not in the tree.");
 this.cmd("Step");
 return null;
 
 } else {


		this.cmd("CreateHighlightCircle", this.highlightID, RadixTree.HIGHLIGHT_CIRCLE_COLOR, tree.x, tree.y);
 this.cmd("SetWidth", this.highlightID, RadixTree.NODE_WIDTH);

		this.cmd("Step")
 	 this.cmd("Move", this.highlightID, tree.children[index].x, tree.children[index].y);
		this.cmd("Step")

		this.cmd("Delete", this.highlightID);

 }
		
		
 return this.doFind(tree.children[index], value.substring(indexDifference));
 }

 this.cmd("SetText", 2, "Reached the end of the string. Check if current node is \"True\"")
 this.cmd("Step");
 this.cmd("SetText", 2, "")
 
 if (tree.isword)
 {
 this.cmd("SetText", 2, "Node is \"True\", string is in tree")
 this.cmd("Step");
 this.cmd("SetText", 2, "")
 this.cmd("SetHighlight", tree.graphicID , 0);
 return tree;

 }
 else
 {
 this.cmd("SetText", 2, "Node is \"False\", string is not in tree")
 this.cmd("Step");
 this.cmd("SetText", 2, "")
 this.cmd("SetHighlight", tree.graphicID , 0);
 return null;

 }
 }
 else
 {
 this.cmd("SetText", 2, "Reached end of search string, \nStill characters remaining at node\nString not in tree")
 this.cmd("Step");
 this.cmd("SetHighlight", tree.graphicID , 0);
 this.cmd("SetText", 2, "")
 return null;

 
 }

}


RadixTree.prototype.deleteElement = function(deletedValue)
{
	this.commands = [];
	this.cmd("SetText", 0, "正在刪除: ");
	this.cmd("SetText", 1, deletedValue);
 this.cmd("AlignRight", 1, 0);
 
 var node = this.doFind(this.root, deletedValue);

 if (node == null)
 {
	 this.cmd("SetText", 2, "String not in the tree, nothing to delete");
 this.cmd("Step");
	 this.cmd("SetText", 0, "");
	 this.cmd("SetText", 1, "");
	 this.cmd("SetText", 2, "");
 }
 else 
 {
	 node.isword = false;
	 this.cmd("SetText", 2, "Found string to delete, setting node to \"False\"");
 this.cmd("Step");
	 this.cmd("SetBackgroundColor", node.graphicID, RadixTree.FALSE_COLOR);
 this.cmd("Step");
	 this.cleanupAfterDelete(node)
	 this.cmd("SetText", 0, "");
	 this.cmd("SetText", 1, "");
	 this.cmd("SetText", 2, "");
 }

	return this.commands;						
}



RadixTree.prototype.numChildren = function(tree)
{
 if (tree == null)
 {
 return 0;
 }
 var children = 0
 for (var i = 0; i < 26; i++)
 {
 if (tree.children[i] != null)
 {
 children++;
 }
 }
 return children;

}


RadixTree.prototype.isLeaf = function(tree)
{
 if (tree == null)
 {
 return false;
 }
 for (var i = 0; i < 26; i++)
 {
 if (tree.children[i] != null)
 {
 return false;
 }
 }
 return true;
}


RadixTree.prototype.getParentIndex = function(tree)
{
 if (tree.parent == null)
 {
 return -1;
 }
 var par = tree.parent;
 for (var i = 0; i < 26; i++)
 {
 if (par.children[i] == tree)
 {
 return i;
 }
 }
 return -1;
}

RadixTree.prototype.cleanupAfterDelete = function(tree)
{
 var children = this.numChildren(tree)

 if (children == 0 && !tree.isword)
 {
 this.cmd("SetText", 2, "Deletion left us with a \"False\" leaf\nRemoving false leaf");
 	 this.cmd("SetHighlight" ,tree.graphicID , 1);
 this.cmd("Step");
 	 this.cmd("SetHighlight", tree.graphicID , 0);
 if (tree.parent != null)
 {
 var index = 0
 while (tree.parent.children[index] != tree)
 {
 index++;
 }
 this.cmd("Disconnect", tree.parent.graphicID, tree.graphicID);
 	 this.cmd("Delete", tree.graphicID , 0);
 tree.parent.children[index] = null;
 this.cleanupAfterDelete(tree.parent);
 }
 else
 {
 	 this.cmd("Delete", tree.graphicID , 0);
 this.root = null;
 }
 }
 else if (children == 1 && !tree.isword)
 {
 var childIndex = -1;
 for (var i = 0; i < 26; i++)
 {
 if (tree.children[i] != null) 
 {
		childIndex = i;
 break;
 }
	}
 this.cmd("SetText", 2, "Deletion left us with a \"False\" node\nContaining one child. Combining ...");
 this.cmd("SetHighlight" ,tree.graphicID , 1);
 this.cmd("Step");
	this.cmd("SetHighlight", tree.graphicID , 0);
	
	var child = tree.children[childIndex];
 child.wordRemainder = tree.wordRemainder + child.wordRemainder;
 this.cmd("SetText", child.graphicID, child.wordRemainder);
	this.cmd("Disconnect", tree.graphicID , child.graphicID);
	
 if (tree.parent == null)
 {
 child.parent = null
	 this.root = child;
	 this.cmd("Delete", tree.graphicID);
 }
	else
	{
	 var parIndex = this.getParentIndex(tree);
	 this.cmd("Disconnect", tree.parent.graphicID, tree.graphicID);
	 tree.parent.children[parIndex] = child;
 child.parent = tree.parent
	 this.cmd("Connect", tree.parent.graphicID, child.graphicID, RadixTree.FOREGROUND_COLOR, 0, false, child.wordRemainder.charAt(0));
	 this.cmd("Delete", tree.graphicID);
 
	}
	this.resizeTree();
	
 }


}



RadixTree.prototype.treeDelete = function(tree, valueToDelete)
{
	
}

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


RadixTree.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");
 this.highlightID = this.nextIndex++;
 this.root = this.addR(word.toUpperCase(), this.root, RadixTree.LEFT_MARGIN + RadixTree.NODE_WIDTH / 2 + 1, RadixTree.STARTING_Y, 0);
 this.resizeTree();
	this.cmd("SetText", 0, "");
	this.cmd("SetText", 1, "");
 
 return this.commands;
}


RadixTree.prototype.addR = function(s, rt, startX, startY, wordIndex) 
{
 if (rt == null) 
 {
		this.cmd("CreateCircle", this.nextIndex, s, RadixTree.NEW_NODE_X, RadixTree.NEW_NODE_Y); 
		this.cmd("SetForegroundColor", this.nextIndex, RadixTree.FOREGROUND_COLOR);
		this.cmd("SetBackgroundColor", this.nextIndex, RadixTree.BACKGROUND_COLOR);
 this.cmd("SetWidth", this.nextIndex, RadixTree.NODE_WIDTH);
	 this.cmd("SetText", 2, "Reached an empty tree. Creating a node containing " + s);
		this.cmd("Step");				
	 this.cmd("SetText", 2, "" );
 rt = new RadixNode(s, this.nextIndex, startX, startY)
		this.nextIndex += 1;
 rt.isword = true;
 return rt;
 }

	this.cmd("SetHighlight", rt.graphicID , 1);




 var indexDifference = this.findIndexDifference(s, rt.wordRemainder, rt.graphicID, wordIndex);
 
// 	this.cmd("CreateHighlightCircle", this.highlightID, BST.HIGHLIGHT_CIRCLE_COLOR, tree.x, tree.y);
//	this.cmd("Move", this.highlightID, tree.left.x, tree.left.y);
// this.cmd("Step");



 if (indexDifference == rt.wordRemainder.length)
 {
 
 this.cmd("SetText", 2, "Reached the end of the prefix stored at this node");
 this.cmd("Step");

 if (s.length > indexDifference)
 { 
		this.cmd("SetText", 2, "Recusively insert remaining string \ninto the '" +s.charAt(indexDifference) + "' child");
 this.cmd("Step");
 this.cmd("SetHighlight", rt.graphicID , 0);
		this.cmd("SetText", 1, s.substring(indexDifference));



		// TODO: HIGHLIGHT CIRCLE!

 var index = s.charCodeAt(indexDifference) - "A".charCodeAt(0);
		var noChild = rt.children[index] == null;


		if (noChild)
 {
 		 this.cmd("SetText", 2, "Child '" +s.charAt(indexDifference) + "' does not exit. Creating ...");
 this.cmd("Step");
 
 } else {


		this.cmd("CreateHighlightCircle", this.highlightID, RadixTree.HIGHLIGHT_CIRCLE_COLOR, rt.x, rt.y);
 this.cmd("SetWidth", this.highlightID, RadixTree.NODE_WIDTH);

		this.cmd("Step")
 	 this.cmd("Move", this.highlightID, rt.children[index].x, rt.children[index].y);
		this.cmd("Step")

		this.cmd("Delete", this.highlightID);
		 // DO HIGHILIGHT CIRCLE THING HERE
 }
		
		
		var connect = rt.children[index] == null;
 rt.children[index] = this.addR(s.substring(indexDifference), rt.children[index], rt.x, rt.y, wordIndex+indexDifference);
		rt.children[index].parent = rt;
 if (connect)
		{
		 this.cmd("Connect", rt.graphicID, rt.children[index].graphicID, RadixTree.FOREGROUND_COLOR, 0, false, s.charAt(indexDifference));
 }
 return rt;
 }
 this.cmd("SetText", 2, "Reached the end of the string. Set Current node to \"True\"")
 this.cmd("Step");
 this.cmd("SetText", 2, "")

 this.cmd("SetBackgroundColor", rt.graphicID, RadixTree.BACKGROUND_COLOR);
 this.cmd("Step");
 this.cmd("SetHighlight", rt.graphicID , 0);

 rt.isword = true;
 return rt; 
 }

 var firstRemainder = rt.wordRemainder.substring(0, indexDifference);
 var secondRemainder = rt.wordRemainder.substring(indexDifference);

 this.cmd("SetText", 2, "Reached a mismatch in prefix. \nCreate a new node with common prefix")

 this.cmd("CreateCircle", this.nextIndex, firstRemainder, RadixTree.NEW_NODE_X, RadixTree.NEW_NODE_Y);
	this.cmd("SetForegroundColor", this.nextIndex, RadixTree.FOREGROUND_COLOR);
 	this.cmd("SetBackgroundColor", this.nextIndex, RadixTree.FALSE_COLOR);
 this.cmd("SetWidth", this.nextIndex, RadixTree.NODE_WIDTH);
 this.cmd("Step")

 var newNode = new RadixNode(firstRemainder, this.nextIndex, 0, 0);
	this.nextIndex += 1;

 newNode.wordRemainder = firstRemainder;
 
 var index = rt.wordRemainder.charCodeAt(indexDifference) - "A".charCodeAt(0);
 newNode.parent = rt.parent;
 newNode.children[index] = rt;
 if (rt.parent != null)
 {
	 
 this.cmd("Disconnect", rt.parent.graphicID, rt.graphicID);
 	 this.cmd("Connect", rt.parent.graphicID, newNode.graphicID, RadixTree.FOREGROUND_COLOR, 0, false, newNode.wordRemainder.charAt(0));
 var childIndex = newNode.wordRemainder.charCodeAt(0) - 'A'.charCodeAt(0);
 rt.parent.children[childIndex] = newNode;
 rt.parent = newNode;

 }
 else
 {
	 this.root = newNode;
 }
 this.cmd("SetHighlight", rt.graphicID, 0);

 rt.parent = newNode;

 this.cmd("SetText", 2, "Connect new node to the old, and reset prefix stored at previous node");

	this.cmd("Connect", newNode.graphicID, newNode.children[index].graphicID, RadixTree.FOREGROUND_COLOR, 0, false, rt.wordRemainder.charAt(indexDifference));
 rt.wordRemainder = secondRemainder; 
 this.cmd("SetText", rt.graphicID, rt.wordRemainder);
 this.cmd("Step");



 this.resizeTree();

 if (indexDifference == s.length)
 {
 newNode.isword = true;
	 this.cmd("SetBackgroundColor", newNode.graphicID, RadixTree.BACKGROUND_COLOR);
 }
 else
 {
	 this.cmd("SetBackgroundColor", newNode.graphicID, RadixTree.FALSE_COLOR);
 index = s.charCodeAt(indexDifference) - "A".charCodeAt(0)
 this.cmd("SetText", 1, s.substring(indexDifference));

 newNode.children[index] = this.addR(s.substring(indexDifference), null, rt.x, rt.y, indexDifference+wordIndex);
	 newNode.children[index].parent = newNode;
	 this.cmd("Connect", newNode.graphicID, newNode.children[index].graphicID, RadixTree.FOREGROUND_COLOR, 0, false, s.charAt(indexDifference));

 } 
 return newNode;
 }

RadixTree.prototype.setNewPositions = function(tree, xPosition, yPosition)
{
	if (tree != null)
	{
 tree.x = xPosition;
		tree.y = yPosition;
 var newX = xPosition - tree.width / 2;
 var newY = yPosition + RadixTree.HEIGHT_DELTA;
 for (var i = 0; i < 26; i++)
 { 
 if (tree.children[i] != null)
 {
 this.setNewPositions(tree.children[i], newX + tree.children[i].width / 2, newY);
 newX = newX + tree.children[i].width;
 }
 }
	}
	
}
RadixTree.prototype.animateNewPositions = function(tree)
{
	if (tree != null)
	{
		this.cmd("Move", tree.graphicID, tree.x, tree.y);
 for (var i = 0; i < 26; i++)
 { 
 this.animateNewPositions(tree.children[i])
 }
	}
}

RadixTree.prototype.resizeWidths = function(tree) 
{
	if (tree == null)
	{
		return 0;
	}
 var size = 0;
	for (var i = 0; i < 26; i++)
	{
 tree.childWidths[i] = this.resizeWidths(tree.children[i]);
 size += tree.childWidths[i]
	}
 tree.width = Math.max(size, RadixTree.NODE_WIDTH + 4)
 return tree.width;
}




function RadixNode(val, id, initialX, initialY)
{
	this.wordRemainder = val;
	this.x = initialX;
	this.y = initialY;
	this.graphicID = id;
 this.children = new Array(26);
 this.childWidths = new Array(26);
 for (var i = 0; i < 26; i++)
	{
 this.children[i] = null;
 this.childWidths[i] =0;
	}
 this.width = 0;
	this.parent = null;
 this.isword = false;
}

RadixTree.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;
}

RadixTree.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 RadixTree(animManag, canvas.width, canvas.height);
	
}