if(!window["MUI"]) window["MUI"]={};

MUI.Node = new Class({
    initialize:function(title, options){
    	this.title = title;
    	this.setOptions(options);
    },

    setOptions:function(options){
        this.options = Object.extend({}, options);
    },

    render:function(){
        return new Element("span").setHTML( this.title );
    },

    bringIn:function(el){
    	el = $(el);
    	this.title = el.innerHTML;
    	return this;
    }
});

MUI.Node.dots = "";

MUI.LinkNode = MUI.Node.extend({
    initialize:function(title, url){
    	this.parent(title);
    	this.url = url;
    },

    render:function(){
    	return new Element("a")
    			.setProperty("href", this.url)
    			.appendText(this.title);
    },

    bringIn:function(el){
    	el = $(el);
    	this.title = el.innerHTML;
    	this.url = el.getProperty("href");
    	return this;
    }
});

MUI.Tree = MUI.Node.extend({

    initialize: function(title, options){
    	this.parent(title, options);
    	this._children = [];
    },

    addChild: function(oChild){
    	if(oChild instanceof MUI.Node){
    	    this._children[this._children.length] = oChild;
    	}
    },

    removeChild: function(oChild){
    	if($type(oChild)=='number'){
    	    this._children = this._children.splice(oChild,1);
    	}else{
    	    this._children = this._children.remove(oChild);
    	}
    },

    titleClicked:function(){
    	this.opened = !!this.opened;
    	if(!this.opened){
    	    this._listEl.setStyle('display', 'block');
    	}else{
    	    this._listEl.setStyle('display', 'none');
    	}
    	this.opened = !this.opened;
    	var eventName = this.opened?"onExpand":"onCollapse";
    	this.fireEvent(eventName);
    	MUI.Tree.GlobalEvents.fireEvent(eventName, [this]);
    },

    expand:function(all){
        if(all){
            this._children.each(function(oChild){
                if(oChild instanceof MUI.Tree){
                    oChild.titleClicked();
                }
            });
        }
        this.titleClicked();
    },

    render:function(root){

    	var selfEl = new Element("div").addClass("mui-tree");
    	var self = this;

    	this._titleEl = new Element("div").addClass("mui-treetitle").injectInside(selfEl);

        if( this.title )
            this._titleEl.adopt(this.title.render());

    	// Create the children list
    	if(this._children.length>0){
    	    this._titleEl.addEvent("click", this.titleClicked.bind(this));

    	    this._listEl = new Element("ul");
            if( this.title )
                this._listEl.setStyle("display","none");
    	    this._children.each(function(oChild){
                new Element("li").adopt( oChild.render() ).injectInside(this._listEl);
    	    }.bind(this));
    	    this._listEl.injectInside(selfEl);

    	}
    	return selfEl;
    },

    bringIn: function(container){

    	container = $(container);
    	if(container.hasClass("mui-tree")) {
            var title = container.getFirst().firstChild;
        	if(title.nodeName=="A"){
        	    this.title = new MUI.LinkNode().bringIn(title);
        	}else{
        	    this.title = new MUI.Node(title.nodeValue);
        	}
        }

    	var mainTreeEl = $(container.getElementsByTagName("ul")[0]);
    	var nodesEls = mainTreeEl.getChildren();

    	nodesEls.each(function(nodeEl){
    	    if( nodeEl.parentNode==mainTreeEl ){
        		var firstChild = nodeEl.getFirst();
        		if( firstChild.hasClass("mui-tree") ){
        		    this.addChild(new MUI.Tree().bringIn(firstChild));
        		}else if( firstChild.getTag() == 'a' ){
        		    this.addChild(new MUI.LinkNode().bringIn(firstChild));
        		}else{
        		    this.addChild( new MUI.Node().bringIn(firstChild) );
        		}
    	    }
    	}.bind(this));

    	return this;
    }
});

MUI.Tree.implement(new Events, new Options);

// MUI.Tree.GlobalEvents - used for registering events for all trees
MUI.Tree.GlobalEvents = new Events();

Element.extend({
    makeAsTree:function(){
    	//if(this.hasClass("mui-tree")){
    	    var tree = new MUI.Tree().bringIn(this).render();
    	    this.replaceWith(tree);
    	//}
    }
});