// Node object

function Node(id, pid, name, url, title, target, icon, iconOpen, open, showCheckbox, isChecked)
{
    this.id = id;
	this.pid = pid;
	this.name = name;
	this.url = url;
	this.title = title;
	this.target = target;
	this.icon = icon;
	this.iconOpen = iconOpen;
	this.checkbox = showCheckbox;
	this.checked = isChecked;
	this._io = open || false;
	this._is = false;
	this._ls = false;
	this._hc = false;
	this._ai = 0;
	this._p;
};

// Tree object

function dTree(objName)
{
	this.config = 
    {
		target : null,
		folderLinks	: true,
		useSelection : true,
		useCookies : true,
		useLines : true,
		useIcons : false,
		useStatusText : false,
		closeSameLevel : false,
		inOrder	: false
	}

	this.icon = 
    {
		root : 'files/images/tree/base.gif',
		folder : 'files/images/tree/folder.gif',
		folderOpen	: 'files/images/tree/folderopen.gif',
		node : 'files/images/tree/page.gif',
		empty : 'files/images/tree/empty.gif',
		line : 'files/images/tree/line.gif',
		join : 'files/images/tree/join.gif',
		joinBottom : 'files/images/tree/joinbottom.gif',
		plus : 'files/images/tree/plus.gif',
		plusBottom	: 'files/images/tree/plusbottom.gif',
		minus : 'files/images/tree/minus.gif',
		minusBottom	: 'files/images/tree/minusbottom.gif',
		nlPlus : 'files/images/tree/nolines_plus.gif',
		nlMinus : 'files/images/tree/nolines_minus.gif'
	};

	this.obj = objName;
	this.aNodes = [];
	this.aIndent = [];
	this.root = new Node(-1);
	this.selectedNode = null;
	this.selectedFound = false;
	this.completed = false;
};

// Adds a new node to the node array
dTree.prototype.add = function(id, pid, name, url, title, target, icon, iconOpen, open, showCheckbox, isChecked)
{
	this.aNodes[this.aNodes.length] = new Node(id, pid, name, url, title, target, icon, iconOpen, open, showCheckbox, isChecked);
};

// Open/close all nodes
dTree.prototype.openAll = function() { this.oAll(true); };
dTree.prototype.closeAll = function() { this.oAll(false); };

// Outputs the tree to the page
dTree.prototype.toString = function()
{
    var str = '<div class="dtree">\n';
	if (document.getElementById)
    {
    	if (this.config.useCookies)
            this.selectedNode = this.getSelected();
		str += this.addNode(this.root);
	}
    else str += 'Browser not supported.';
	str += '</div>';
	if (!this.selectedFound)
        this.selectedNode = null;
	this.completed = true;
	return str;
};

// Creates the tree structure
dTree.prototype.addNode = function(pNode)
{
	var str = '';
	var n=0;
	if (this.config.inOrder)
        n = pNode._ai;
	for (n; n<this.aNodes.length; n++)
    {
		if (this.aNodes[n].pid == pNode.id)
        {
			var cn = this.aNodes[n];
			cn._p = pNode;
			cn._ai = n;
			this.setCS(cn);
			if (!cn.target && this.config.target)
                cn.target = this.config.target;
			if (cn._hc && !cn._io && this.config.useCookies)
                cn._io = this.isOpen(cn.id);
			if (!this.config.folderLinks && cn._hc)
                cn.url = null;
			if (this.config.useSelection && cn.id == this.selectedNode && !this.selectedFound)
            {
					cn._is = true;
					this.selectedNode = n;
					this.selectedFound = true;
			}
			str += this.node(cn, n);
			if (cn._ls) break;
		}
	}
	return str;
};

// Creates the node icon, url and text
dTree.prototype.node = function(node, nodeId)
{
	var str = '<table cellpadding="0" cellspacing="0" class="dTreeNode"><tr><td>' + this.indent(node, nodeId);
	if (this.config.useIcons)
    {
		if (!node.icon)
            node.icon = (this.root.id == node.pid) ? this.icon.root : ((node._hc) ? this.icon.folder : this.icon.node);

		if (!node.iconOpen)
            node.iconOpen = (node._hc) ? this.icon.folderOpen : this.icon.node;

		if (this.root.id == node.pid)
        {
			node.icon = this.icon.root;
			node.iconOpen = this.icon.root;
		}
		str += '<img id="i' + this.obj + nodeId + '" src="' + ((node._io) ? node.iconOpen : node.icon) + '" alt="" />';
	}
	
    str += '</td><td>';
	if (node.url)
    {
        if (node.checkbox)
		{
			if (!node.checked)
				str += '<input type="checkbox" name="page_id" value="' + node.id + '">';
			else
				str += '<input type="checkbox" checked="checked" name="page_id" value="' + node.id + '">';
		}
        str += '</td><td>';
    	str += '<a id="s' + this.obj + nodeId + '" class="' + ((this.config.useSelection) ? ((node._is ? 'nodeSel' : 'node')) : 'node') + '" href="' + node.url + '"';

		if (node.title)
            str += ' title="' + node.title + '"';
		if (node.target) 
            str += ' target="' + node.target + '"';

		if (this.config.useStatusText) 
            str += ' onmouseover="window.status=\'' + node.name + '\';return true;" onmouseout="window.status=\'\';return true;" ';

		if (this.config.useSelection && ((node._hc && this.config.folderLinks) || !node._hc))
			str += ' onclick="javascript: ' + this.obj + '.s(' + nodeId + ');"';
		str += '>';
	}

	else if ((!this.config.folderLinks || !node.url) && node._hc && node.pid != this.root.id)
	{
        if (node.checkbox)
		{
			if (node.checked)
				str += '<input checked="checked" type="checkbox" name="page_id" value="' + nodeId + '">';
			else
				str += '<input type="checkbox" name="page_id" value="' + nodeId + '">';
		}
        str += '</td><td>';
		str += '<a href="javascript: ' + this.obj + '.o(' + nodeId + ');" class="node">';
    }
	str += node.name;
	
	if (node.url || ((!this.config.folderLinks || !node.url) && node._hc))
        str += '</a>';
	str += '</td></tr></table>';
	if (node._hc)
    {
		str += '<div id="d' + this.obj + nodeId + '" class="clip" style="display:' + ((this.root.id == node.pid || node._io) ? 'block' : 'none') + ';">';
		str += this.addNode(node);
		str += '</div>';
	}

	this.aIndent.pop();
	return str;
};

// Adds the empty and line icons
dTree.prototype.indent = function(node, nodeId)
{
	var str = '';
	if (this.root.id != node.pid)
    {
		for (var n=0; n<this.aIndent.length; n++)
			str += '<img src="' + ( (this.aIndent[n] == 1 && this.config.useLines) ? this.icon.line : this.icon.empty ) + '" alt="" />';
		(node._ls) ? this.aIndent.push(0) : this.aIndent.push(1);
		if (node._hc)
        {
			str += '<a href="javascript: ' + this.obj + '.o(' + nodeId + ');"><img id="j' + this.obj + nodeId + '" src="';
			if (!this.config.useLines)
                str += (node._io) ? this.icon.nlMinus : this.icon.nlPlus;
			else 
                str += ( (node._io) ? ((node._ls && this.config.useLines) ? this.icon.minusBottom : this.icon.minus) : ((node._ls && this.config.useLines) ? this.icon.plusBottom : this.icon.plus ) );
    		str += '" alt="" /></a>';

		}
        else
            str += '<img src="' + ( (this.config.useLines) ? ((node._ls) ? this.icon.joinBottom : this.icon.join ) : this.icon.empty) + '" alt="" />';
	}
	return str;
};

// Checks if a node has any children and if it is the last sibling
dTree.prototype.setCS = function(node)
{
	var lastId;
	for (var n=0; n<this.aNodes.length; n++)
    {
		if (this.aNodes[n].pid == node.id) node._hc = true;
		if (this.aNodes[n].pid == node.pid) lastId = this.aNodes[n].id;
	}
	if (lastId==node.id) node._ls = true;
};

// Returns the selected node
dTree.prototype.getSelected = function()
{
	var sn = this.getCookie('cs' + this.obj);
	return (sn) ? sn : null;
};

// Highlights the selected node
dTree.prototype.s = function(id)
{
	if (!this.config.useSelection) return;
	var cn = this.aNodes[id];
	if (cn._hc && !this.config.folderLinks) return;
	if (this.selectedNode != id)
    {
		if (this.selectedNode || this.selectedNode==0)
        {
			eOld = document.getElementById("s" + this.obj + this.selectedNode);
			eOld.className = "node";
		}
		eNew = document.getElementById("s" + this.obj + id);
		eNew.className = "nodeSel";
		this.selectedNode = id;
		if (this.config.useCookies) this.setCookie('cs' + this.obj, cn.id);
	}
};

// Toggle Open or close
dTree.prototype.o = function(id)
{
	var cn = this.aNodes[id];
	this.nodeStatus(!cn._io, id, cn._ls);
	cn._io = !cn._io;
	if (this.config.closeSameLevel) this.closeLevel(cn);
	if (this.config.useCookies) this.updateCookie();
};

// Open or close all nodes
dTree.prototype.oAll = function(status)
{
	for (var n=0; n<this.aNodes.length; n++) {
		if (this.aNodes[n]._hc && this.aNodes[n].pid != this.root.id) {
			this.nodeStatus(status, n, this.aNodes[n]._ls)
			this.aNodes[n]._io = status;
		}
	}
	if (this.config.useCookies) this.updateCookie();
};

// Opens the tree to a specific node
dTree.prototype.openTo = function(nId, bSelect, bFirst) {

	if (!bFirst) {

		for (var n=0; n<this.aNodes.length; n++) {

			if (this.aNodes[n].id == nId) {

				nId=n;

				break;

			}

		}

	}

	var cn=this.aNodes[nId];

	if (cn.pid==this.root.id || !cn._p) return;

	cn._io = true;

	cn._is = bSelect;

	if (this.completed && cn._hc) this.nodeStatus(true, cn._ai, cn._ls);

	if (this.completed && bSelect) this.s(cn._ai);

	else if (bSelect) this._sn=cn._ai;

	this.openTo(cn._p._ai, false, true);

};



// Closes all nodes on the same level as certain node

dTree.prototype.closeLevel = function(node) {

	for (var n=0; n<this.aNodes.length; n++) {

		if (this.aNodes[n].pid == node.pid && this.aNodes[n].id != node.id && this.aNodes[n]._hc) {

			this.nodeStatus(false, n, this.aNodes[n]._ls);

			this.aNodes[n]._io = false;

			this.closeAllChildren(this.aNodes[n]);

		}

	}

}



// Closes all children of a node

dTree.prototype.closeAllChildren = function(node) {

	for (var n=0; n<this.aNodes.length; n++) {

		if (this.aNodes[n].pid == node.id && this.aNodes[n]._hc) {

			if (this.aNodes[n]._io) this.nodeStatus(false, n, this.aNodes[n]._ls);

			this.aNodes[n]._io = false;

			this.closeAllChildren(this.aNodes[n]);		

		}

	}

}



// Change the status of a node(open or closed)

dTree.prototype.nodeStatus = function(status, id, bottom) {

	eDiv	= document.getElementById('d' + this.obj + id);

	eJoin	= document.getElementById('j' + this.obj + id);

	if (this.config.useIcons) {

		eIcon	= document.getElementById('i' + this.obj + id);

		eIcon.src = (status) ? this.aNodes[id].iconOpen : this.aNodes[id].icon;

	}

	eJoin.src = (this.config.useLines)?

	((status)?((bottom)?this.icon.minusBottom:this.icon.minus):((bottom)?this.icon.plusBottom:this.icon.plus)):

	((status)?this.icon.nlMinus:this.icon.nlPlus);

	eDiv.style.display = (status) ? 'block': 'none';

};





// [Cookie] Clears a cookie

dTree.prototype.clearCookie = function() {

	var now = new Date();

	var yesterday = new Date(now.getTime() - 1000 * 60 * 60 * 24);

	this.setCookie('co'+this.obj, 'cookieValue', yesterday);

	this.setCookie('cs'+this.obj, 'cookieValue', yesterday);

};



// [Cookie] Sets value in a cookie

dTree.prototype.setCookie = function(cookieName, cookieValue, expires, path, domain, secure) {

	document.cookie =

		escape(cookieName) + '=' + escape(cookieValue)

		+ (expires ? '; expires=' + expires.toGMTString() : '')

		+ (path ? '; path=' + path : '')

		+ (domain ? '; domain=' + domain : '')

		+ (secure ? '; secure' : '');

};



// [Cookie] Gets a value from a cookie

dTree.prototype.getCookie = function(cookieName) {

	var cookieValue = '';

	var posName = document.cookie.indexOf(escape(cookieName) + '=');

	if (posName != -1) {

		var posValue = posName + (escape(cookieName) + '=').length;

		var endPos = document.cookie.indexOf(';', posValue);

		if (endPos != -1) cookieValue = unescape(document.cookie.substring(posValue, endPos));

		else cookieValue = unescape(document.cookie.substring(posValue));

	}

	return (cookieValue);

};



// [Cookie] Returns ids of open nodes as a string

dTree.prototype.updateCookie = function() {

	var str = '';

	for (var n=0; n<this.aNodes.length; n++) {

		if (this.aNodes[n]._io && this.aNodes[n].pid != this.root.id) {

			if (str) str += '.';

			str += this.aNodes[n].id;

		}

	}

	this.setCookie('co' + this.obj, str);

};



// [Cookie] Checks if a node id is in a cookie

dTree.prototype.isOpen = function(id) {

	var aOpen = this.getCookie('co' + this.obj).split('.');

	for (var n=0; n<aOpen.length; n++)

		if (aOpen[n] == id) return true;

	return false;

};



// If Push and pop is not implemented by the browser

if (!Array.prototype.push) {

	Array.prototype.push = function array_push() {

		for(var i=0;i<arguments.length;i++)

			this[this.length]=arguments[i];

		return this.length;

	}

};

if (!Array.prototype.pop) {

	Array.prototype.pop = function array_pop() {

		lastElement = this[this.length-1];

		this.length = Math.max(this.length-1,0);

		return lastElement;

	}

};