// ===================================================================
// Author: Matt Kruse <matt@mattkruse.com>
// WWW: http://www.mattkruse.com/
addEvent(window,"load",convertTrees);
function addEvent(o,e,f){if(o.addEventListener){o.addEventListener(e,f,true);return true;}else if(o.attachEvent){return o.attachEvent("on"+e,f);}else{return false;}}
function setDefault(name,val){if(typeof(window[name])=="undefined" || window[name]==null){window[name]=val;}}
function expandTree(treeId){var ul = document.getElementById(treeId);if(ul == null){return false;}expandCollapseList(ul,nodeOpenClass);}
function collapseTree(treeId){var ul = document.getElementById(treeId);if(ul == null){return false;}expandCollapseList(ul,nodeClosedClass);}
function expandToItem(treeId,itemId){var ul = document.getElementById(treeId);if(ul == null){return false;}var ret = expandCollapseList(ul,nodeOpenClass,itemId);if(ret){var o = document.getElementById(itemId);if(o.scrollIntoView){o.scrollIntoView(false);}}}
function expandCollapseList(ul,cName,itemId){if(!ul.childNodes || ul.childNodes.length==0){return false;}for(var itemi=0;itemi<ul.childNodes.length;itemi++){var item = ul.childNodes[itemi];if(itemId!=null && item.id==itemId){return true;}if(item.nodeName == "LI"){var subLists = false;for(var sitemi=0;sitemi<item.childNodes.length;sitemi++){var sitem = item.childNodes[sitemi];if(sitem.nodeName=="UL"){subLists = true;var ret = expandCollapseList(sitem,cName,itemId);if(itemId!=null && ret){item.className=cName;return true;}}}if(subLists && itemId==null){item.className = cName;}}}}

function convertTrees(){
	setDefault("treeClass","mktree");
	setDefault("nodeClosedClass","liClosed");
	setDefault("nodeOpenClass","liOpen");
	setDefault("nodeBulletClass","liBullet");
	setDefault("nodeLinkClass","mktree-bullet");
	setDefault("preProcessTrees",true);
	
	if(preProcessTrees){
		if(!document.createElement){return;}
		uls = document.getElementsByTagName("ul");
		for(var uli=0;uli<uls.length;uli++){
			var ul=uls[uli];
			if(ul.nodeName=="UL" && ul.className==treeClass){
				processList(ul);
			}
		}
	}
}

function processList(ul){
	if(!ul.childNodes || ul.childNodes.length==0){return;}
	for(var itemi=0;itemi<ul.childNodes.length;itemi++){
		var item = ul.childNodes[itemi];
		if(item.nodeName == "LI"){
			// ethan.e.james@gmail.com 10.11.2007
			// the collapsed sub-lists have an annoying tendency to appear expanded before they get parsed/processed by this code, so
			// I set their className to '.preload-collapsed { display: none; }'
			// Now I need to go through and take that out so that they behave properly once they've been processed
			if (item.className == 'process-collapsed') item.className = '';
			var subLists = false;
			for(var sitemi=0;sitemi<item.childNodes.length;sitemi++){
				var sitem = item.childNodes[sitemi];
				if(sitem.nodeName=="UL"){
					subLists = true;
					processList(sitem);
				}
			}
			var s= document.createElement("SPAN");
			var t= '\u00A0';
			s.className = nodeLinkClass;
			if(subLists){
				if(item.className==null || item.className==""){
					item.className = nodeClosedClass;
				}
				if(item.firstChild.nodeName=="#text"){
					t = t+item.firstChild.nodeValue;
					item.removeChild(item.firstChild);
				}
				s.onclick = function(){
					this.parentNode.className =(this.parentNode.className==nodeOpenClass) ? nodeClosedClass : nodeOpenClass;
					return false;
				}
			}else{
				item.className = nodeBulletClass;
				s.onclick = function(){return false;}
			}
			s.appendChild(document.createTextNode(t));
			item.insertBefore(s,item.firstChild);
		}
	}
}

// Set default to false because they don't start off expanded
techTreeExpanded = false;
possTreeExpanded = false;

// A very specific function, not the best in re-use, but should be fast
function toggleTree(treeId){

	if(treeId == "techTree"){
		if(techTreeExpanded == true){
			collapseTree(treeId);
			techTreeExpanded = false;
		} else {
			expandTree(treeId);
			techTreeExpanded = true;
		}
	}
	
	if(treeId == "possTree"){
		if(possTreeExpanded){
			collapseTree(treeId);
			possTreeExpanded = false;
		} else {
			expandTree(treeId);
			possTreeExpanded = true;
		}
	}
}