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

Spry.Widget.TabbedPanels = function(element, opts)
{
	this.element = this.getElement(element);
	this.defaultTab = 0; // Show the first panel by default.
	this.bindings = [];
	this.tabSelectedClass = "TabbedPanelsTabSelected";
	this.tabHoverClass = "TabbedPanelsTabHover";
	this.tabFocusedClass = "TabbedPanelsTabFocused";
	this.panelVisibleClass = "TabbedPanelsContentVisible";
	this.focusElement = null;
	this.hasFocus = false;
	this.currentTabIndex = 0;
	this.enableKeyboardNavigation = true;

	Spry.Widget.TabbedPanels.setOptions(this, opts);

	// If the defaultTab is expressed as a number/index, convert
	// it to an element.

	if (typeof (this.defaultTab) == "number")
	{
		if (this.defaultTab < 0)
			this.defaultTab = 0;
		else
		{
			var count = this.getTabbedPanelCount();
			if (this.defaultTab >= count)
				this.defaultTab = (count > 1) ? (count - 1) : 0;
		}

		this.defaultTab = this.getTabs()[this.defaultTab];
	}

	// The defaultTab property is supposed to be the tab element for the tab content
	// to show by default. The caller is allowed to pass in the element itself or the
	// element's id, so we need to convert the current value to an element if necessary.

	if (this.defaultTab)
		this.defaultTab = this.getElement(this.defaultTab);

	this.attachBehaviors();
};

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

Spry.Widget.TabbedPanels.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;
};

Spry.Widget.TabbedPanels.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.TabbedPanels.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"), "");
};

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

Spry.Widget.TabbedPanels.prototype.getTabGroup = function()
{
	if (this.element)
	{
		var children = this.getElementChildren(this.element);
		if (children.length)
			return children[0];
	}
	return null;
};

Spry.Widget.TabbedPanels.prototype.getTabs = function()
{
	var tabs = [];
	var tg = this.getTabGroup();
	if (tg)
		tabs = this.getElementChildren(tg);
	return tabs;
};

Spry.Widget.TabbedPanels.prototype.getContentPanelGroup = function()
{
	if (this.element)
	{
		var children = this.getElementChildren(this.element);
		if (children.length > 1)
			return children[1];
	}
	return null;
};

Spry.Widget.TabbedPanels.prototype.getContentPanels = function()
{
	var panels = [];
	var pg = this.getContentPanelGroup();
	if (pg)
		panels = this.getElementChildren(pg);
	return panels;
};

Spry.Widget.TabbedPanels.prototype.getIndex = function(ele, arr)
{
	ele = this.getElement(ele);
	if (ele && arr && arr.length)
	{
		for (var i = 0; i < arr.length; i++)
		{
			if (ele == arr[i])
				return i;
		}
	}
	return -1;
};

Spry.Widget.TabbedPanels.prototype.getTabIndex = function(ele)
{
	var i = this.getIndex(ele, this.getTabs());
	if (i < 0)
		i = this.getIndex(ele, this.getContentPanels());
	return i;
};

Spry.Widget.TabbedPanels.prototype.getCurrentTabIndex = function()
{
	return this.currentTabIndex;
};

Spry.Widget.TabbedPanels.prototype.getTabbedPanelCount = function(ele)
{
	return Math.min(this.getTabs().length, this.getContentPanels().length);
};

Spry.Widget.TabbedPanels.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.TabbedPanels.prototype.onTabClick = function(e, tab)
{
	this.showPanel(tab);
};

Spry.Widget.TabbedPanels.prototype.onTabMouseOver = function(e, tab)
{
	this.addClassName(tab, this.tabHoverClass);
};

Spry.Widget.TabbedPanels.prototype.onTabMouseOut = function(e, tab)
{
	this.removeClassName(tab, this.tabHoverClass);
};

Spry.Widget.TabbedPanels.prototype.onTabFocus = function(e, tab)
{
	this.hasFocus = true;
	this.addClassName(this.element, this.tabFocusedClass);
};

Spry.Widget.TabbedPanels.prototype.onTabBlur = function(e, tab)
{
	this.hasFocus = false;
	this.removeClassName(this.element, this.tabFocusedClass);
};

Spry.Widget.TabbedPanels.ENTER_KEY = 13;
Spry.Widget.TabbedPanels.SPACE_KEY = 32;

Spry.Widget.TabbedPanels.prototype.onTabKeyDown = function(e, tab)
{
	var key = e.keyCode;
	if (!this.hasFocus || (key != Spry.Widget.TabbedPanels.ENTER_KEY && key != Spry.Widget.TabbedPanels.SPACE_KEY))
		return true;

	this.showPanel(tab);

	if (e.stopPropagation)
		e.stopPropagation();
	if (e.preventDefault)
		e.preventDefault();

	return false;
};

Spry.Widget.TabbedPanels.prototype.preorderTraversal = function(root, func)
{
	var stopTraversal = false;
	if (root)
	{
		stopTraversal = func(root);
		if (root.hasChildNodes())
		{
			var child = root.firstChild;
			while (!stopTraversal && child)
			{
				stopTraversal = this.preorderTraversal(child, func);
				try { child = child.nextSibling; } catch (e) { child = null; }
			}
		}
	}
	return stopTraversal;
};

Spry.Widget.TabbedPanels.prototype.addPanelEventListeners = function(tab, panel)
{
	var self = this;
	Spry.Widget.TabbedPanels.addEventListener(tab, "click", function(e) { return self.onTabClick(e, tab); }, false);
	Spry.Widget.TabbedPanels.addEventListener(tab, "mouseover", function(e) { return self.onTabMouseOver(e, tab); }, false);
	Spry.Widget.TabbedPanels.addEventListener(tab, "mouseout", function(e) { return self.onTabMouseOut(e, tab); }, false);

	if (this.enableKeyboardNavigation)
	{
		// XXX: IE doesn't allow the setting of tabindex dynamically. This means we can't
		// rely on adding the tabindex attribute if it is missing to enable keyboard navigation
		// by default.

		// Find the first element within the tab container that has a tabindex or the first
		// anchor tag.
		
		var tabIndexEle = null;
		var tabAnchorEle = null;

		this.preorderTraversal(tab, function(node) {
			if (node.nodeType == 1 /* NODE.ELEMENT_NODE */)
			{
				var tabIndexAttr = tab.attributes.getNamedItem("tabindex");
				if (tabIndexAttr)
				{
					tabIndexEle = node;
					return true;
				}
				if (!tabAnchorEle && node.nodeName.toLowerCase() == "a")
					tabAnchorEle = node;
			}
			return false;
		});

		if (tabIndexEle)
			this.focusElement = tabIndexEle;
		else if (tabAnchorEle)
			this.focusElement = tabAnchorEle;

		if (this.focusElement)
		{
			Spry.Widget.TabbedPanels.addEventListener(this.focusElement, "focus", function(e) { return self.onTabFocus(e, tab); }, false);
			Spry.Widget.TabbedPanels.addEventListener(this.focusElement, "blur", function(e) { return self.onTabBlur(e, tab); }, false);
			Spry.Widget.TabbedPanels.addEventListener(this.focusElement, "keydown", function(e) { return self.onTabKeyDown(e, tab); }, false);
		}
	}
};

Spry.Widget.TabbedPanels.prototype.showPanel = function(elementOrIndex)
{
	var tpIndex = -1;
	
	if (typeof elementOrIndex == "number")
		tpIndex = elementOrIndex;
	else // Must be the element for the tab or content panel.
		tpIndex = this.getTabIndex(elementOrIndex);
	
	if (!tpIndex < 0 || tpIndex >= this.getTabbedPanelCount())
		return;

	var tabs = this.getTabs();
	var panels = this.getContentPanels();

	var numTabbedPanels = Math.max(tabs.length, panels.length);

	for (var i = 0; i < numTabbedPanels; i++)
	{
		if (i != tpIndex)
		{
			if (tabs[i])
				this.removeClassName(tabs[i], this.tabSelectedClass);
			if (panels[i])
			{
				this.removeClassName(panels[i], this.panelVisibleClass);
				panels[i].style.display = "none";
			}
		}
	}
  if(tpIndex >= 0){
	this.addClassName(tabs[tpIndex], this.tabSelectedClass);
	this.addClassName(panels[tpIndex], this.panelVisibleClass);
	panels[tpIndex].style.display = "block";

	this.currentTabIndex = tpIndex;
  }
};

Spry.Widget.TabbedPanels.prototype.attachBehaviors = function(element)
{
	var tabs = this.getTabs();
	var panels = this.getContentPanels();
	var panelCount = this.getTabbedPanelCount();

	for (var i = 0; i < panelCount; i++)
		this.addPanelEventListeners(tabs[i], panels[i]);

	this.showPanel(this.defaultTab);
};


// 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.