// Copyright 2011 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 <COPYRIGHT HOLDER> ``AS IS'' AND ANY EXPRESS OR IMPLIED
// WARRANTIES, INCLUDING, BUT NOT LIMITED 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


var ARRAY_START_X = 100;
var ARRAY_START_Y = 200;
var ARRAY_ELEM_WIDTH = 50;
var ARRAY_ELEM_HEIGHT = 50;

var ARRRAY_ELEMS_PER_LINE = 15;
var ARRAY_LINE_SPACING = 130;

var HEAD_POS_X = 180;
var HEAD_POS_Y = 100;
var HEAD_LABEL_X = 130;
var HEAD_LABEL_Y = 100;

var TAIL_POS_X = 280;
var TAIL_POS_Y = 100;
var TAIL_LABEL_X = 230;
var TAIL_LABEL_Y = 100;

var QUEUE_LABEL_X = 50;
var QUEUE_LABEL_Y = 30;
var QUEUE_ELEMENT_X = 120;
var QUEUE_ELEMENT_Y = 30;

var INDEX_COLOR = "#0000FF"

var SIZE = 15;

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

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


QueueArray.prototype.init = function(am, w, h)
{
	QueueArray.superclass.init.call(this, am, w, h);
	this.addControls();
	this.nextIndex = 0;
	this.commands = [];
	//this.tail_pos_y = h - LINKED_LIST_ELEM_HEIGHT;
//	this.tail_label_y = this.tail_pos_y;
	this.setup();
	this.initialIndex = this.nextIndex;
}


QueueArray.prototype.addControls = function()
{
	this.controls = [];
	this.enqueueField = addControlToAlgorithmBar("Text", "");
	this.enqueueField.onkeydown = this.returnSubmit(this.enqueueField, this.enqueueCallback.bind(this), 6);
	this.enqueueButton = addControlToAlgorithmBar("Button", "Enqueue");
	this.enqueueButton.onclick = this.enqueueCallback.bind(this);
	this.controls.push(this.enqueueField);
	this.controls.push(this.enqueueButton);

	this.dequeueButton = addControlToAlgorithmBar("Button", "Dequeue");
	this.dequeueButton.onclick = this.dequeueCallback.bind(this);
	this.controls.push(this.dequeueButton);
	
	this.clearButton = addControlToAlgorithmBar("Button", "Clear Queue");
	this.clearButton.onclick = this.clearCallback.bind(this);
	this.controls.push(this.clearButton);
	
}

QueueArray.prototype.enableUI = function(event)
{
	for (var i = 0; i < this.controls.length; i++)
	{
		this.controls[i].disabled = false;
	}
	
	
}
QueueArray.prototype.disableUI = function(event)
{
	for (var i = 0; i < this.controls.length; i++)
	{
		this.controls[i].disabled = true;
	}
}


QueueArray.prototype.setup = function()
{

	this.nextIndex = 0;
	
	this.arrayID = new Array(SIZE);
	this.arrayLabelID = new Array(SIZE);
	for (var i = 0; i < SIZE; i++)
	{
		
		this.arrayID[i]= this.nextIndex++;
		this.arrayLabelID[i]= this.nextIndex++;
	}
	this.headID = this.nextIndex++;
	headLabelID = this.nextIndex++;
	this.tailID = this.nextIndex++;
	tailLabelID = this.nextIndex++;
	
	this.arrayData = new Array(SIZE);
	this.head = 0;
	this.tail = 0;
	this.leftoverLabelID = this.nextIndex++;
	
	
	for (var i = 0; i < SIZE; i++)
	{
		var xpos = (i % ARRRAY_ELEMS_PER_LINE) * ARRAY_ELEM_WIDTH + ARRAY_START_X;
		var ypos = Math.floor(i / ARRRAY_ELEMS_PER_LINE) * ARRAY_LINE_SPACING + ARRAY_START_Y;
		this.cmd("CreateRectangle", this.arrayID[i],"", ARRAY_ELEM_WIDTH, ARRAY_ELEM_HEIGHT,xpos, ypos);
		this.cmd("CreateLabel",this.arrayLabelID[i], i, xpos, ypos + ARRAY_ELEM_HEIGHT);
		this.cmd("SetForegroundColor", this.arrayLabelID[i], INDEX_COLOR);
		
	}
	this.cmd("CreateLabel", headLabelID, "Head", HEAD_LABEL_X, HEAD_LABEL_Y);
	this.cmd("CreateRectangle", this.headID, 0, ARRAY_ELEM_WIDTH, ARRAY_ELEM_HEIGHT, HEAD_POS_X, HEAD_POS_Y);
	
	this.cmd("CreateLabel", tailLabelID, "Tail", TAIL_LABEL_X, TAIL_LABEL_Y);
	this.cmd("CreateRectangle", this.tailID, 0, ARRAY_ELEM_WIDTH, ARRAY_ELEM_HEIGHT, TAIL_POS_X, TAIL_POS_Y);
	
	
	
	this.cmd("CreateLabel", this.leftoverLabelID, "", QUEUE_LABEL_X, QUEUE_LABEL_Y);
	

	this.initialIndex = this.nextIndex;

	this.highlight1ID = this.nextIndex++;
	this.highlight2ID = this.nextIndex++;

	this.animationManager.StartNewAnimation(this.commands);
	this.animationManager.skipForward();
	this.animationManager.clearHistory();
		
	
}
		
		
QueueArray.prototype.reset = function()
{
	this.top = 0;
	this.nextIndex = this.initialIndex;

}
		
		
QueueArray.prototype.enqueueCallback = function(event)
{
	if ((this.tail + 1) % SIZE != this.head && this.enqueueField.value != "")
	{
		var pushVal = this.enqueueField.value;
		this.enqueueField.value = ""
		this.implementAction(this.enqueue.bind(this), pushVal);
	}
}
		
		
QueueArray.prototype.dequeueCallback = function(event)
{
	if (this.tail != this.head)
	{
		this.implementAction(this.dequeue.bind(this), "");
	}
}
		

QueueArray.prototype.clearCallback = function(event)
{
	this.implementAction(this.clearAll.bind(this), "");
}

		

QueueArray.prototype.enqueue = function(elemToEnqueue)
{
	this.commands = new Array();
	
	var labEnqueueID = this.nextIndex++;
	var labEnqueueValID = this.nextIndex++;
	this.arrayData[this.tail] = elemToEnqueue;
	this.cmd("SetText", this.leftoverLabelID, "");
	
	this.cmd("CreateLabel", labEnqueueID, "Enqueuing Value: ", QUEUE_LABEL_X, QUEUE_LABEL_Y);
	this.cmd("CreateLabel", labEnqueueValID,elemToEnqueue, QUEUE_ELEMENT_X, QUEUE_ELEMENT_Y);
	
	this.cmd("Step");			
	this.cmd("CreateHighlightCircle", this.highlight1ID, INDEX_COLOR, TAIL_POS_X, TAIL_POS_Y);
	this.cmd("Step");
	
	var xpos = (this.tail % ARRRAY_ELEMS_PER_LINE) * ARRAY_ELEM_WIDTH + ARRAY_START_X;
	var ypos = Math.floor(this.tail / ARRRAY_ELEMS_PER_LINE) * ARRAY_LINE_SPACING + ARRAY_START_Y;
	
	this.cmd("Move", this.highlight1ID, xpos, ypos + ARRAY_ELEM_HEIGHT); 				
	this.cmd("Step");
	
	this.cmd("Move", labEnqueueValID, xpos, ypos);
	this.cmd("Step");
	
	this.cmd("Settext", this.arrayID[this.tail], elemToEnqueue);
	this.cmd("Delete", labEnqueueValID);
	
	this.cmd("Delete", this.highlight1ID);
	
	this.cmd("SetHighlight", this.tailID, 1);
	this.cmd("Step");
	this.tail = (this.tail + 1) % SIZE;
	this.cmd("SetText", this.tailID, this.tail)
	this.cmd("Step");
	this.cmd("SetHighlight", this.tailID, 0);
	this.cmd("Delete", labEnqueueID);
	
	return this.commands;
}

QueueArray.prototype.dequeue = function(ignored)
{
	this.commands = new Array();
	
	var labDequeueID = this.nextIndex++;
	var labDequeueValID = this.nextIndex++;
	
	this.cmd("SetText", this.leftoverLabelID, "");
	
	
	this.cmd("CreateLabel", labDequeueID, "Dequeued Value: ", QUEUE_LABEL_X, QUEUE_LABEL_Y);
	
	this.cmd("CreateHighlightCircle", this.highlight1ID, INDEX_COLOR, HEAD_POS_X, HEAD_POS_Y);
	this.cmd("Step");
	
	var xpos = (this.head % ARRRAY_ELEMS_PER_LINE) * ARRAY_ELEM_WIDTH + ARRAY_START_X;
	var ypos = Math.floor(this.head / ARRRAY_ELEMS_PER_LINE) * ARRAY_LINE_SPACING + ARRAY_START_Y;
	
	this.cmd("Move", this.highlight1ID, xpos, ypos + ARRAY_ELEM_HEIGHT); 				
	this.cmd("Step");		
	
	this.cmd("Delete", this.highlight1ID);
	
	
	var dequeuedVal = this.arrayData[this.head]
	this.cmd("CreateLabel", labDequeueValID,dequeuedVal, xpos, ypos);
	this.cmd("Settext", this.arrayID[this.head], "");
	this.cmd("Move", labDequeueValID, QUEUE_ELEMENT_X, QUEUE_ELEMENT_Y);
	this.cmd("Step");
	
	this.cmd("SetHighlight", this.headID, 1);
	this.cmd("Step");
	this.head = (this.head + 1 ) % SIZE;
	this.cmd("SetText", this.headID, this.head)
	this.cmd("Step");
	this.cmd("SetHighlight", this.headID, 0);
	
	this.cmd("SetText", this.leftoverLabelID, "Dequeued Value: " + dequeuedVal);
	
	
	this.cmd("Delete", labDequeueID)
	this.cmd("Delete", labDequeueValID);
	
	
	
	return this.commands;
}



QueueArray.prototype.clearAll = function()
{
	this.commands = new Array();
	this.cmd("SetText", this.leftoverLabelID, "");
	
	for (var i = 0; i < SIZE; i++)
	{
		this.cmd("SetText", this.arrayID[i], "");
	}
	this.head = 0;
	this.tail = 0;
	this.cmd("SetText", this.headID, "0");
	this.cmd("SetText", this.tailID, "0");
	return this.commands;
	
}


var currentAlg;

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