/*
 * menuExpandable2.js - implements an expandable menu based on a HTML list
 * Author: Dave Lindquist (dave@gazingus.org)
 */

if (!document.getElementById)
{
	document.getElementById = function()
	{
		return null;
	}
}

var menuCookie = "menusToExpand";
var itemCookie = "itemToHighlight";

function initializeMenu(menuId, actuatorId)
{
	var menu = document.getElementById(menuId);
	var actuator = document.getElementById(actuatorId);

	if (menu == null || actuator == null) return;

	//if (window.opera) return; // I'm too tired

	actuator.parentNode.style.backgroundImage = "url(frontend/components/struts-menu/images/plus.gif)";
	actuator.onclick = function()
	{
		var display = menu.style.display;
		this.parentNode.style.backgroundImage =
		(display == "block") ? "url(frontend/components/struts-menu/images/plus.gif)" : "url(frontend/components/struts-menu/images/minus.gif)";
		menu.style.display = (display == "block") ? "none" : "block";

		// Begin custom code for remembering expanded menus with cookies
		var menusToExpand = getCookie(menuCookie);
		if (menu.style.display == "block")
		{
			// set a cookie to keep the menu expanded
			if (menusToExpand == null)
			{
				setCookie(menuCookie, menuId);
			}
			else if (menusToExpand.indexOf(menuId) == -1)
			{
				setCookie(menuCookie, menusToExpand + "," + menuId);
			}
		}
		else
		{
			// remove it from the expanded cookie list
			if (menusToExpand.indexOf(menuId) != -1)
			{
				// check for comma after menu
				if (menusToExpand.indexOf(menuId + ",") != -1)
				{
					menusToExpand = menusToExpand.replace(menuId + ",", "");
				}
				else
				{
					menusToExpand = menusToExpand.replace(menuId, "");
				}
				if (menusToExpand == "")
				{
					deleteCookie(menuCookie);
				}
				else
				{
					setCookie(menuCookie, menusToExpand);
				}
			}
		}
		// End custom code
		return false;
	}
}

// This function loops through all the <ul>'s in the document and
// initializes the menus for them if they have menu classes
function initializeMenus()
{
	var uls = document.getElementsByTagName("ul");
	for (jj = 0; jj < uls.length; jj++)
	{
		if (uls[jj].className == "menuList")
		{
			decorateMenu(uls[jj]);
		}
	}

	// user must have cookies enabled for this to work
	expandMenus();
}

function decorateMenu(menu)
{
	var links = menu.getElementsByTagName("a");

	// FIX by gmeloni for multi menus in one page
	var lists = menu.getElementsByTagName("ul");
//	var lists = document.getElementById(menu.id).getElementsByTagName("ul");

	var actuators = new Array();
	var nonActuators = new Array();
	// build an array of actuators
	for (i = 0; i < links.length; i++)
	{
		if (links[i].className == "actuator")
		{
			actuators[actuators.length] = links[i];
		}
		else
		{
			nonActuators[nonActuators.length] = links[i];
		}
	}

	var menus = new Array();
	// build an array of menus
	for (i = 0; i < lists.length; i++)
	{
		if (lists[i].className == "menu" || lists[i].className == "submenu")
		{
			menus[menus.length] = lists[i];
		}
	}

	// initialize actuators and menus (number should be the same)
	for (i = 0; i < actuators.length; i++)
	{
		initializeMenu(menus[i].id, actuators[i].id);
	}

	// Begin custom code to remember last item clicked (with cookies)
	// add an onclick event to set a cookie on the non-actuators
	for (i = 0; i < nonActuators.length; i++)
	{
		// retain any existing onclick handlers from menu-config.xml
		if (nonActuators[i].onclick)
		{
			nonActuators[i].onclick = function()
			{
				setCookie(itemCookie, this.href);
				if (eval(this.getAttribute("onclick")) == false)
				{
					return false;
				}
			};
		}
		else
		{
			nonActuators[i].onclick = function()
			{
				setCookie(itemCookie, this.href);
			};
		}
	}
}


function openMenu(menuId)
{
	var menu = document.getElementById(menuId);
	var actuatorId = menuId.substring(0, menuId.indexOf("Menu")) + "Actuator";
	var actuator = document.getElementById(actuatorId);
	if (menu != null)
	{
		var display = menu.style.display;
		menu.parentNode.style.backgroundImage = "url(frontend/components/struts-menu/images/minus.gif)";
		menu.style.display = (display == "block") ? "none" : "block";
	}
}

function expandMenus()
{
	var menusToExpand = getCookie(menuCookie);
	if (menusToExpand != null)
	{
		// if more than one menu has been menusToExpanded,
		// create an array of menusToExpanded menus
		if (menusToExpand.indexOf(",") != -1)
		{
			menuArray = menusToExpand.split(",");
			for (var i = 0; i < menuArray.length; i++)
			{
				openMenu(menuArray[i]);
			}
		}
		else
		{
			openMenu(menusToExpand);
		}
	}
	var itemToHighlight = getCookie(itemCookie);
	var links = document.getElementsByTagName("a");
	// add an onclick event to set a cookie on the non-actuators
	for (i = 0; i < links.length; i++)
	{
		if (links[i].href == itemToHighlight)
		{
			links[i].className += " highlight";
		}
	}
}

// =========================================================================
//                          Cookie functions
// =========================================================================
/* This function is used to set cookies */
function setCookie(name, value, expires, path, domain, secure)
{
	document.cookie = name + "=" + escape(value) +
	                  ((expires) ? "; expires=" + expires.toGMTString() : "") +
	                  ((path) ? "; path=" + path : "") +
	                  ((domain) ? "; domain=" + domain : "") + ((secure) ? "; secure" : "");
}

/* This function is used to get cookies */
function getCookie(name)
{
	var prefix = name + "="
	var start = document.cookie.indexOf(prefix)

	if (start == -1)
	{
		return null;
	}

	var end = document.cookie.indexOf(";", start + prefix.length)
	if (end == -1)
	{
		end = document.cookie.length;
	}

	var value = document.cookie.substring(start + prefix.length, end)
	return unescape(value);
}

/* This function is used to delete cookies */
function deleteCookie(name, path, domain)
{
	if (getCookie(name))
	{
		document.cookie = name + "=" +
		                  ((path) ? "; path=" + path : "") +
		                  ((domain) ? "; domain=" + domain : "") +
		                  "; expires=Thu, 01-Jan-70 00:00:01 GMT";
	}
}

/* You can call initializeMenus() manually from your JSP if this doesn't work.
 * Just put the following code after the last menu tag.
 * <script type="text/javascript">
 *     initializeMenus();
 * </script>
 */
window.onload = initializeMenus;