/*
 * Content-seperated javascript tree widget
 * Copyright (C) 2005 SilverStripe Limited
 * Feel free to use this on your websites, but please leave this message in the fies
 * http://www.silverstripe.com/blog
*/

var statearray =  new Array();
var documentID = window.location.href;
var documentPath = null;

/*
 * Initialise all trees identified by <ul class="tree">
 */
function autoInit_trees() {
	readStates();
	var candidates = document.getElementsByTagName('ul');
	for(var i=0;i<candidates.length;i++) {
		if(candidates[i].className && candidates[i].className.indexOf('tree') != -1) {
			initTree(candidates[i], 0);
			candidates[i].className = candidates[i].className.replace(/ ?unformatted ?/, ' ');
		}
	}
}
 
/*
 * Initialise a tree node, converting all its LIs appropriately
 */
function initTree(el) {
	var i,j;
	var spanA, spanB, spanC;
	var startingPoint, stoppingPoint, childUL;
	
	// Find all LIs to process
	for(i=0;i<el.childNodes.length;i++) {
		if(el.childNodes[i].tagName && el.childNodes[i].tagName.toLowerCase() == 'li') {
			var li = el.childNodes[i];

			if (statearray[li.getAttribute('id').substring(1)] == undefined) {
				statearray[li.getAttribute('id').substring(1)] = 0;
			}
			else if (statearray[li.getAttribute('id').substring(1)] == 1) {
				removeClass(li, 'closed');
			}
			// Create our extra spans
			spanA = document.createElement('span');
			spanB = document.createElement('span');
			spanB1 = document.createElement('span');
			spanC = document.createElement('span');
			spanA.appendChild(spanB);
			spanB.appendChild(spanB1);
			spanB.appendChild(spanC);
			spanA.className = 'a ' + li.className.replace('closed', 'spanClosed');
			spanA.onMouseOver = function() {}
			spanB.className = 'b';
			spanB1.className = 'b1';
			spanB1.innerHTML = "&emsp;";
			spanB1.onclick = treeToggle;
			spanC.className = 'c';
			
			// Find the UL within the LI, if it exists
			stoppingPoint = li.childNodes.length;
			startingPoint = 0;
			childUL = null;
			for(j=0;j<li.childNodes.length;j++) {
				if(li.childNodes[j].tagName && li.childNodes[j].tagName.toLowerCase() == 'div') {
					startingPoint = j + 1;
					continue;
				}

				if(li.childNodes[j].tagName && li.childNodes[j].tagName.toLowerCase() == 'ul') {
					childUL = li.childNodes[j];
					stoppingPoint = j;
					break;					
				}
			}
				
			// Move all the nodes up until that point into spanC
			for(j=startingPoint;j<stoppingPoint;j++) {
				spanC.appendChild(li.childNodes[startingPoint]);
			}
			
			// Insert the outermost extra span into the tree
			if(li.childNodes.length > startingPoint) li.insertBefore(spanA, li.childNodes[startingPoint]);
			else li.appendChild(spanA);
			
			// Process the children
			if(childUL != null) {
				if(initTree(childUL)) {
					addClass(li, 'children', 'closed');
					addClass(spanA, 'children', 'spanClosed');
				}
			}
		}
	}
	
	if(li) {
		// li and spanA will still be set to the last item
		addClass(li, 'last', 'closed');
		addClass(spanA, 'last', 'spanClosed');
		return true;
	} else {
		return false;
	}
		
}

function readStates() {
	//setCookie('tree' + documentID,'0^1^1^1^1^1^1^1^1^1');
	states = getCookie('tree' + documentID);
	if (states != null) {
		statearray = states.split('^');
	}
}

function writeStates() {
	var str = '';
	for(var i=0;i<statearray.length;i++) {
		if (statearray[i] != undefined) {
			str += statearray[i] + '^';
		}
		else {
			str += '0^';
		}
	}
	setCookie('tree' + documentID, str, null, webDir + '/' + documentID + '/');
}

/*
 * +/- toggle the tree, where el is the <span class="b"> node
 * force, will force it to "open" or "close"
 */
function treeToggle(el, force) {
	el = this;
	
	while(el != null && (!el.tagName || el.tagName.toLowerCase() != "li")) el = el.parentNode;
	
	// Get UL within the LI
	var childSet = findChildWithTag(el, 'ul');
	var topSpan = findChildWithTag(el, 'span');

	if( force != null ){
		
		if( force == "open"){
			treeOpen( topSpan, el );
			statearray[el.getAttribute('id').substring(1)] = 1;
		}
		else if( force == "close" ){
			treeClose( topSpan, el )
			statearray[el.getAttribute('id').substring(1)] = 0;
		}
		
	}
	
	else if( childSet != null) {
		// Is open, close it
		if(!el.className.match(/(^| )closed($| )/)) {		
			treeClose( topSpan, el )
			statearray[el.getAttribute('id').substring(1)] = 0;
		// Is closed, open it
		} else {			
			treeOpen( topSpan, el )
			statearray[el.getAttribute('id').substring(1)] = 1;
		}
	}
	
	writeStates();
}


function treeOpen( a, b ){
	removeClass(a,'spanClosed');
	removeClass(b,'closed');
}
	
	
function treeClose( a, b ){
	addClass(a,'spanClosed');
	addClass(b,'closed');
}

/*
 * Find the a child of el of type tag
 */
function findChildWithTag(el, tag) {
	for(var i=0;i<el.childNodes.length;i++) {
		if(el.childNodes[i].tagName != null && el.childNodes[i].tagName.toLowerCase() == tag) return el.childNodes[i];
	}
	return null;
}

/*
 * Functions to add and remove class names
 * Mac IE hates unnecessary spaces
 */
function addClass(el, cls, forceBefore) {
	if(forceBefore != null && el.className.match(new RegExp('(^| )' + forceBefore))) {
		el.className = el.className.replace(new RegExp("( |^)" + forceBefore), '$1' + cls + ' ' + forceBefore);

	} else if(!el.className.match(new RegExp('(^| )' + cls + '($| )'))) {
		el.className += ' ' + cls;
		el.className = el.className.replace(/(^ +)|( +$)/g, '');
	}
}

function removeClass(el, cls) {
	var old = el.className;
	var newCls = ' ' + el.className + ' ';
	newCls = newCls.replace(new RegExp(' (' + cls + ' +)+','g'), ' ');
	el.className = newCls.replace(/(^ +)|( +$)/g, '');
} 


function getCookieVal (offset) {  
	var endstr = document.cookie.indexOf (";",offset);  
	if (endstr == -1) {
		endstr = document.cookie.length;
	}
	return unescape(document.cookie.substring(offset,endstr));
}
function getCookie (name) {  
	var arg = name + "=";
	var alen = arg.length;
	var clen = document.cookie.length;
	var i = 0;
	while (i < clen) {
		var j = i + alen;
		if (document.cookie.substring(i, j) == arg) {
			return getCookieVal(j);
		}
		i = document.cookie.indexOf(" ", i) + 1;
		if (i == 0) {
			break;
		}
	}
	return null;
}
function setCookie (name, value) {  
	var argv = setCookie.arguments;  
	var argc = setCookie.arguments.length;  
	var expires = (argc > 2) ? argv[2] : null;  
	var path = (argc > 3) ? argv[3] : null;
	path = (path == null) ? documentPath : path;
	var domain = (argc > 4) ? argv[4] : null;  
	var secure = (argc > 5) ? argv[5] : false;  
	document.cookie = name + "=" + escape (value) + ((expires == null) ? "" : ("; expires=" + expires.toGMTString())) + ((path == null) ? "" : ("; path=" + path)) + ((domain == null) ? "" : ("; domain=" + domain)) + ((secure == true) ? "; secure" : "");
}

SafeAddOnload(autoInit_trees);