// SpryAccordion.js - version 0.13 - Spry Pre-Release 1.5
//
// Copyright (c) 2006. Adobe Systems Incorporated.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//   * Redistributions of source code must retain the above copyright notice,
//     this list of conditions and the following disclaimer.
//   * 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.
//   * Neither the name of Adobe Systems Incorporated nor the names of its
//     contributors may be used to endorse or promote products derived from this
//     software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT OWNER 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.
//
// 2007-07-28 Paul Davis 
//
// Added the ability to have rounded corners, to use this first change the roundedCorners
// variable to true in the following code, the .CSS has the new classes called out that 
// are used for rounded corners, you can replace the images with anything you would like.
// If you want the panels to activate when you mouse over them, simply change the hotAnimation
// variable to true. When you do activate this change the code no longer uses the hover hilight
// CSS elements.
//
// 2008-01-28 Paul Davis
// 
// Changed the code to dynamically calculate the height of the background window so that we can add and remove
// menu levels without having to change any code.
//
// 2008-02-07
//
// Changed the code so the open panel does not hightlight and you cannot close an open panel.
//
// 2008-07-15
// 
// Added a toggle to change the hot rollover behaviour.

var Spry;
if (!Spry) Spry = {};
if (!Spry.Widget) Spry.Widget = {};

Spry.Widget.Accordion = function(element, opts)
	{
	this.element = this.getElement(element);
	this.defaultPanel = 0;
	this.hoverClass = "AccordionPanelHover";
	this.openClass = "AccordionPanelOpen";
	this.closedClass = "AccordionPanelClosed";
	this.focusedClass = "AccordionFocused";
	this.enableAnimation = true;
	this.enableRollovers = false;
	this.enableKeyboardNavigation = true;
	this.currentPanel = null;
	this.animator = false;
	this.hasFocus = null;
	this.firefox = false; 				// used for a firefox fix...	
	this.closeOpenPanel = false;	// If true you can close and open panel (does not apply to hot animations)
	this.hotAnimation=true; 			// Set this to true to do hot rollovers.
	this.roundedCorners=true; 		// Set this for rounded corner handling.
	this.slowStart=true;					// Set this for a delayed reaction when a tab animates.
	this.headerHeight=28;					// Height in pixels for our panel headers.
	this.panelHeight=190;					// Height of our panels for the accordian.

	this.previousPanelKeyCode = Spry.Widget.Accordion.KEY_UP;
	this.nextPanelKeyCode = Spry.Widget.Accordion.KEY_DOWN;

	this.useFixedPanelHeights = true;
	this.fixedPanelHeight = 0;
	this.expandOnClick = false;
	
	if (navigator.userAgent.indexOf("Firefox") > 0 || navigator.userAgent.indexOf("MSIE 8.0") > 0 || navigator.userAgent.indexOf("Opera") == 0)
 		this.firefox = true;

	Spry.Widget.Accordion.setOptions(this, opts, true);

	this.attachBehaviors();	
		
	if (this.useFixedPanelHeights == true)
		{
		var panels = this.getPanels();
		this.bckgrndHeight = (panels.length * 28) + this.panelHeight + 1;	
		var element = this.getElement('navigation');
		element.style.height = this.bckgrndHeight + "px";
		}
	};

Spry.Widget.Accordion.setOptions = function(obj, optionsObj, ignoreUndefinedProps)
	{
	if (!optionsObj)
		return;
	for (var optionName in optionsObj)
		{
		if (ignoreUndefinedProps && optionsObj[optionName] == undefined)
			continue;
		obj[optionName] = optionsObj[optionName];
		}
	};

/////////////////////////////////// Panel Management Options ///////////////////////////////////////

Spry.Widget.Accordion.prototype.initPanel = function(panel, isDefault)
	{
	var content = this.getPanelContent(panel);
	var panelType = this.getPanelType(panel);
	
	if (isDefault)
		{
		this.currentPanel = panel;
		this.removeClassName(this.getPanelTab(panel), this.closedClass+panelType);
		this.addClassName(this.getPanelTab(panel), this.openClass+panelType);

		// Attempt to set up the height of the default panel. We don't want to
		// do any dynamic panel height calculations here because our accordion
		// or one of its parent containers may be display:none.

		if (content)
			{
			if (this.useFixedPanelHeights)
				{
				// We are in fixed panel height mode and the user passed in
				// a panel height for us to use.
	
				if (this.fixedPanelHeight)
					content.style.height = this.fixedPanelHeight + "px";
				}
			else
				{
				// We are in variable panel height mode, but since we can't
				// calculate the panel height here, we just set the height to
				// auto so that it expands to show all of its content.

				content.style.height = "auto";
				}
			}
		}
	else
		{
		this.removeClassName(this.getPanelTab(panel), this.openClass+panelType);
		this.addClassName(this.getPanelTab(panel), this.closedClass+panelType);

		if (content)
			{
			content.style.height = "0px";
			content.style.display = "none";
			}
		}
	
	this.attachPanelHandlers(panel);
	};

Spry.Widget.Accordion.prototype.openPanel = function(elementOrIndex)
	{
	var panelA = this.currentPanel;
	var panelB;

	if (typeof elementOrIndex == "number")
		panelB = this.getPanels()[elementOrIndex];
	else
		panelB = this.getElement(elementOrIndex);
	
	if (!panelB || panelA == panelB)	
		return null;

	var contentA = panelA ? this.getPanelContent(panelA) : null;
	var contentB = this.getPanelContent(panelB);

	if (!contentB)
		return null;

	if (this.firefox == true)
		{
		contentB.style.height = "auto";
		}

	if (this.useFixedPanelHeights && !this.fixedPanelHeight)
		this.fixedPanelHeight = (contentA.offsetHeight) ? contentA.offsetHeight : contentA.scrollHeight;

	var panelType = '';
	if(panelA)																											// Does the panelA object exist? (sanity check)
		{
		panelType = this.getPanelType(panelA);												// Get the current panel type
		this.removeClassName(this.getPanelTab(panelA), this.openClass+panelType);				// remove the open class
		this.addClassName(this.getPanelTab(panelA), this.closedClass+panelType);				// add the closed class
		}

	panelType = this.getPanelType(panelB);													// Get the current panel type
	this.removeClassName(this.getPanelTab(panelB), this.closedClass+panelType);			// remove the closed class
	this.addClassName(this.getPanelTab(panelB), this.openClass+panelType);					// add the open class

	if (this.enableAnimation)
		{
		if (this.animator)
			this.animator.stop();
		this.animator = new Spry.Widget.Accordion.PanelAnimator(this, panelB, { duration: this.duration, fps: this.fps, transition: this.transition });
		this.animator.start();
		}
	else
		{
		if(contentA)
			{
			contentA.style.display = "none";
			contentA.style.height = "0px";
			}
		contentB.style.display = "block";
		contentB.style.height = (this.useFixedPanelHeights ? this.fixedPanelHeight : contentB.scrollHeight) + "px";
		}

	this.currentPanel = panelB;																			// set the current panel			

	return panelB;
	};

Spry.Widget.Accordion.prototype.closePanel = function()
	{
	// The accordion can only ever have one panel open at any
	// give time, so this method only closes the current panel.
	// If the accordion is in fixed panel heights mode, this
	// method does nothing.

	if (!this.useFixedPanelHeights && this.currentPanel)
		{
		var panel = this.currentPanel;
		var content = this.getPanelContent(panel);
		var panelType = this.getPanelType(panel); 			// Set the current panel type
		this.removeClassName(this.getPanelTab(panel), this.openClass+panelType);
		this.addClassName(this.getPanelTab(panel), this.closedClass+panelType);		
		if (content)
			{
			if (this.enableAnimation)
				{
				if (this.animator)
					this.animator.stop();
				this.animator = new Spry.Widget.Accordion.PanelAnimator(this, null, { duration: this.duration, fps: this.fps, transition: this.transition });
				this.animator.start();
				}
			else
				{
				content.style.display = "none";
				content.style.height = "0px";
				}
			}		
		this.currentPanel = null;
		}
	};

Spry.Widget.Accordion.prototype.openNextPanel = function()
	{
	return this.openPanel(this.getCurrentPanelIndex() + 1);
	};

Spry.Widget.Accordion.prototype.openPreviousPanel = function()
	{
	return this.openPanel(this.getCurrentPanelIndex() - 1);
	};

Spry.Widget.Accordion.prototype.openFirstPanel = function()
	{
	return this.openPanel(0);
	};

Spry.Widget.Accordion.prototype.openLastPanel = function()
	{
	alert('opening last panel');		
	var panels = this.getPanels();
	return this.openPanel(panels[panels.length - 1]);
	};

/////////////////////////////////// Panel User Actions ///////////////////////////////////////

Spry.Widget.Accordion.prototype.onPanelTabClick = function(e, panel)
	{
	if (!this.hotAnimation)			
		{		
		if (this.lastPanel(panel)) // Weird on off case for the bottom panel, if the window opens it will leave the bottom type in causing problems.
			{
			var panelType = this.getPanelType(panel);
			this.removeClassName(this.getPanelTab(panel), this.hoverClass+panelType); // Remove the hover Class				
			}
			
		if (panel != this.currentPanel)
			{
			this.openPanel(panel);
			}
		else
			{
			if (this.closeOpenPanel == true)
				this.closePanel();
			}
	
		if (this.enableKeyboardNavigation)
			this.focus();
		}

	if (e.preventDefault) e.preventDefault();
	else e.returnResult = false;
	if (e.stopPropagation) e.stopPropagation();
	else e.cancelBubble = true;

	return false;
	};

Spry.Widget.Accordion.prototype.onPanelTabMouseOver = function(e, panel)
	{		
	if (panel)
		{
		if (this.hotAnimation)
			{
			var validopen = false;
			if (this.animator)
				{
				if (this.animator.finished)
					validopen = true;
				}
			else
				validopen = true;
			
			if (validopen)
				{				
				if (panel != this.currentPanel)					
					this.openPanel(panel);
//				else
//					this.closePanel();
				}
			}
		else
			{
			var panelType = this.getPanelType(panel); 														  // Get the type of panel for bottom and top (if enabled)
			
			if (panel != this.currentPanel)
				{				
				if (panel == this.currentPanel)
					this.removeClassName(this.getPanelTab(panel), this.openClass+panelType);
				else	
					this.removeClassName(this.getPanelTab(panel), this.closedClass+panelType);			
					
				if (this.lastPanel(panel) && panel == this.currentPanel) 								// When the bottom is open it should use a standard bar.
					panelType = '';
				this.addClassName(this.getPanelTab(panel), this.hoverClass+panelType);	// Add in the Class for the top or bottom pane
				}
			}
	
		if (this.enableKeyboardNavigation)
			this.focus();
	
		if (e.preventDefault) e.preventDefault();
		else e.returnResult = false;
		if (e.stopPropagation) e.stopPropagation();
		else e.cancelBubble = true;
		}
	return false;
	};

Spry.Widget.Accordion.prototype.onPanelTabMouseOut = function(e, panel)
	{
	if (!this.hotAnimation)
		{	
		if (panel)
			{
			var panelType = this.getPanelType(panel); 														// Get the type of panel for bottom and top (if enabled)				
			if (panel == this.currentPanel)
				this.addClassName(this.getPanelTab(panel), this.openClass+panelType);
			else	
				this.addClassName(this.getPanelTab(panel), this.closedClass+panelType);										
			if (this.lastPanel(panel) && panel == this.currentPanel) 								// When the bottom is open it should use a standard bar.
				panelType = '';				
			this.removeClassName(this.getPanelTab(panel), this.hoverClass+panelType); // Remove the hover Class				
			}
		}
	return false;
	};

Spry.Widget.Accordion.prototype.onFocus = function(e)
	{
	//var ptype = '';	
	this.hasFocus = true;
	//this.addClassName(this.element, this.focusedClass+ptype);
	return false;
	};

Spry.Widget.Accordion.prototype.onBlur = function(e)
	{
	//var ptype = '';	
	this.hasFocus = false;
	//this.removeClassName(this.element, this.focusedClass+ptype);
	return false;
	};

Spry.Widget.Accordion.KEY_UP = 38;
Spry.Widget.Accordion.KEY_DOWN = 40;

Spry.Widget.Accordion.prototype.onKeyDown = function(e)
	{
	var key = e.keyCode;
	if (!this.hasFocus || (key != this.previousPanelKeyCode && key != this.nextPanelKeyCode))
		return true;
	
	var panels = this.getPanels();
	if (!panels || panels.length < 1)
		return false;
	var currentPanel = this.currentPanel ? this.currentPanel : panels[0];
	var nextPanel = (key == this.nextPanelKeyCode) ? currentPanel.nextSibling : currentPanel.previousSibling;

	while (nextPanel)
		{
		if (nextPanel.nodeType == 1 /* Node.ELEMENT_NODE */)
			break;
		nextPanel = (key == this.nextPanelKeyCode) ? nextPanel.nextSibling : nextPanel.previousSibling;
		}

	if (nextPanel && currentPanel != nextPanel)
		this.openPanel(nextPanel);

	if (e.preventDefault) e.preventDefault();
	else e.returnResult = false;
	if (e.stopPropagation) e.stopPropagation();
	else e.cancelBubble = true;

	return false;
	};

/////////////////////////////////// Class Management Code ///////////////////////////////////////

Spry.Widget.Accordion.prototype.getElement = function(ele)
	{
	if (ele && typeof ele == "string")
		return document.getElementById(ele);
	return ele;
	};

Spry.Widget.Accordion.prototype.addClassName = function(ele, className)
	{
	if (!ele || !className || (ele.className && ele.className.search(new RegExp("\\b" + className + "\\b")) != -1))
		return;
	ele.className += (ele.className ? " " : "") + className;
	};

Spry.Widget.Accordion.prototype.removeClassName = function(ele, className)
	{	
	if (!ele || !className || (ele.className && ele.className.search(new RegExp("\\b" + className + "\\b")) == -1))
		return;
	ele.className = ele.className.replace(new RegExp("\\s*\\b" + className + "\\b", "g"), "");
	};

/////////////////////////////////// Panel Event Handlers ///////////////////////////////////////

Spry.Widget.Accordion.prototype.attachPanelHandlers = function(panel)
	{
	if (!panel)
		return;

	var tab = this.getPanelTab(panel);

	if (tab)
		{
		var self = this;
		if (this.expandOnClick) {
			Spry.Widget.Accordion.addEventListener(tab, "click", function(e) { return self.onPanelTabClick(e, panel); }, false);
		}		
		if (this.enableRollovers)
			{
			Spry.Widget.Accordion.addEventListener(tab, "mouseover", function(e) { return self.onPanelTabMouseOver(e, panel); }, false);
			Spry.Widget.Accordion.addEventListener(tab, "mouseout", function(e) { return self.onPanelTabMouseOut(e, panel); }, false);
			}
		}
	};

Spry.Widget.Accordion.addEventListener = function(element, eventType, handler, capture)
	{
	try
		{
		if (element.addEventListener)
			element.addEventListener(eventType, handler, capture);
		else if (element.attachEvent)
			element.attachEvent("on" + eventType, handler);
		}
	catch (e) {}
	};

Spry.Widget.Accordion.prototype.attachBehaviors = function()
	{
	var panels = this.getPanels();
	for (var i = 0; i < panels.length; i++)
		this.initPanel(panels[i], i == this.defaultPanel);

	// Advanced keyboard navigation requires the tabindex attribute
	// on the top-level element.

	this.enableKeyboardNavigation = (this.enableKeyboardNavigation && this.element.attributes.getNamedItem("tabindex"));
	if (this.enableKeyboardNavigation)
		{
		var self = this;
		Spry.Widget.Accordion.addEventListener(this.element, "focus", function(e) { return self.onFocus(e); }, false);
		Spry.Widget.Accordion.addEventListener(this.element, "blur", function(e) { return self.onBlur(e); }, false);
		Spry.Widget.Accordion.addEventListener(this.element, "keydown", function(e) { return self.onKeyDown(e); }, false);
		}
	};

Spry.Widget.Accordion.prototype.focus = function()
	{
	if (this.element && this.element.focus)
		this.element.focus();
	};

Spry.Widget.Accordion.prototype.blur = function()
	{
	if (this.element && this.element.blur)
		this.element.blur();
	};

/////////////////////////////////// Panel Utility Methods ///////////////////////////////////////

Spry.Widget.Accordion.prototype.getPanels = function()
	{
	return this.getElementChildren(this.element);
	};

Spry.Widget.Accordion.prototype.getCurrentPanel = function()
	{
	return this.currentPanel;
	};

Spry.Widget.Accordion.prototype.getPanelIndex = function(panel)
	{
	var panels = this.getPanels();
	for( var i = 0 ; i < panels.length; i++ )
		{
		if( panel == panels[i] )
			return i;
		}
	return -1;
	};

// check to see if we are on the first panel, if so return true
Spry.Widget.Accordion.prototype.firstPanel = function(panel)
	{
	var index = this.getPanelIndex(panel);		
	if (index	== 0)
		return true;
	return false;	
	}

// check to see if we are on the last panel, if so return false
Spry.Widget.Accordion.prototype.lastPanel = function(panel)
	{
	var index = this.getPanelIndex(panel);		
	if (index != 0)
		{
		var panels = this.getPanels();	
		if (index == panels.length-1) // length is not 0 based so pull it back one
			return true;
		}
	return false;	
	}

Spry.Widget.Accordion.prototype.getCurrentPanelIndex = function()
	{
	return this.getPanelIndex(this.currentPanel);
	};

Spry.Widget.Accordion.prototype.getPanelTab = function(panel)
	{
	if (!panel)
		return null;
	return this.getElementChildren(panel)[0];
	};

Spry.Widget.Accordion.prototype.getPanelContent = function(panel)
	{
	if (!panel)
		return null;
	return this.getElementChildren(panel)[1];
	};

Spry.Widget.Accordion.prototype.managePanelType = function(panel)
	{
	var ptype = '';		
	if (this.roundedCorners)
		{
		if (this.firstPanel(panel) || this.lastPanel(panel)) 																// if the panel is at the top or the bottom
			{
			if (this.lastPanel(panel) == false || this.lastPanel(this.currentPanel) == false)	// if this is not the bottom panel
				{
				ptype = 'Bottom';	
				if (this.firstPanel(panel))
					ptype = 'Top';
				}
			}
		}
	return ptype;
	}

Spry.Widget.Accordion.prototype.getPanelType = function(panel)
	{
	var ptype = '';		
	if (this.roundedCorners)
		{
		if (this.firstPanel(panel) || this.lastPanel(panel)) 																// if the panel is at the top or the bottom
			{
			ptype = 'Bottom';	
			if (this.firstPanel(panel))
				ptype = 'Top';
			}
		}
	return ptype;
	}

Spry.Widget.Accordion.prototype.getElementChildren = function(element)
	{
	var children = [];
	var child = element.firstChild;
	while (child)
		{
		if (child.nodeType == 1 /* Node.ELEMENT_NODE */)
			children.push(child);
		child = child.nextSibling;
		}
	return children;
	};

///////////////////////////////////////////////////////// Animation Code /////////////////////////////////////////////////////

Spry.Widget.Accordion.PanelAnimator = function(accordion, panel, opts)
	{
	this.timer = null;
	this.interval = 0;

	this.fps = 100;
	this.duration = 400;	
	this.startTime = 0;	

	this.slowStart = true;  				// Set this if you want the accordian to pull away slowly and pick up speed	
	this.durationStart = 700;				// This is the duration starting number, higher equals slower starts
	this.durationEnd = 200;					// This is the bottom limit when the accordian stops increasing the speed.
	this.durationIntervalInc = .8;	// This is the interval that the duration interval is increased by on each iteration (this picks up the speed), leave this at zero to prevent it from speeding up. 
	this.durationInterval = 4;			// This is the starting duration interval, the duration start is decremented by this value on each iteration.

	if (this.slowStart)
		this.duration = this.durationStart;

	this.transition = Spry.Widget.Accordion.PanelAnimator.defaultTransition;

	this.onComplete = null;
	this.finished = false;

	this.panel = panel;
	this.panelToOpen = accordion.getElement(panel);
	this.panelData = [];

	Spry.Widget.Accordion.setOptions(this, opts, true);

	this.interval = Math.floor(1000 / this.fps);

	// Set up the array of panels we want to animate.

	var panels = accordion.getPanels();
	for (var i = 0; i < panels.length; i++)
		{
		var p = panels[i];
		var c = accordion.getPanelContent(p);
		if (c)
			{
			var h = c.offsetHeight;
			if (h == undefined)
				h = 0;

			if (p == panel && h == 0)
				c.style.display = "block";

			if (p == panel || h > 0)
				{
				var obj = new Object;
				obj.panel = p;
				obj.content = c;
				obj.fromHeight = h;
				obj.toHeight = (p == panel) ? (accordion.useFixedPanelHeights ? accordion.fixedPanelHeight : c.scrollHeight) : 0;
				obj.distance = obj.toHeight - obj.fromHeight;
				obj.overflow = c.style.overflow;
				this.panelData.push(obj);

				c.style.overflow = "hidden";
				c.style.height = h + "px";
				}
			}
		}
	};

Spry.Widget.Accordion.PanelAnimator.defaultTransition = function(time, begin, finish, duration) 
	{ 
	time /= duration; 
	return begin + ((2 - time) * time * finish); 
	};

Spry.Widget.Accordion.PanelAnimator.prototype.start = function()
	{
	var self = this;
	this.startTime = (new Date).getTime();
	this.timer = setTimeout(function() { self.stepAnimation(); }, this.interval);
	};

Spry.Widget.Accordion.PanelAnimator.prototype.stop = function()
	{
	if (this.timer)
		{
		clearTimeout(this.timer);		

		// If we're killing the timer, restore the overflow
		// properties on the panels we were animating!

		for (i = 0; i < this.panelData.length; i++)
			{
			obj = this.panelData[i];
			obj.content.style.overflow = obj.overflow;
			}
		}

	this.timer = null;
	};

Spry.Widget.Accordion.PanelAnimator.prototype.stepAnimation = function()
	{
	var curTime = (new Date).getTime();
	var elapsedTime = curTime - this.startTime;

	var i, obj;

	if (elapsedTime >= this.duration)
		{
		for (i = 0; i < this.panelData.length; i++)
			{
			obj = this.panelData[i];
			if (obj.panel != this.panel)
				{
				obj.content.style.display = "none";
				obj.content.style.height = "0px";
				}
			obj.content.style.overflow = obj.overflow;
			obj.content.style.height = obj.toHeight + "px";
			}
		if (this.onComplete)
			this.onComplete();
		this.finished = true	
		return;
		}

	for (i = 0; i < this.panelData.length; i++)
		{
		if (this.slowStart)
			{
			this.durationInterval += this.durationIntervalInc;
			if (this.duration > this.durationEnd)			
				this.duration -= this.durationInterval;	
			}			
		obj = this.panelData[i];
		var ht = this.transition(elapsedTime, obj.fromHeight, obj.distance, this.duration);
		obj.content.style.height = ((ht < 0) ? 0 : ht) + "px";
		}
	
	var self = this;
	this.timer = setTimeout(function() { self.stepAnimation(); }, this.interval);
	this.finished = true;
	};