var Menu = Base.extend({

	constructor: function(rootEl, config) {
		this.root = $(rootEl);
		Menu.all.push(this);
	},

	_items: [],
	
	_getActivator: function(n) {
		while(n.previousSibling) {
			n=n.previousSibling;
			if ( n.nodeName=="A" ) return n;
		} return null;
	},
	
	root: null,
	
	config: {
		active: 'active',
		selected: 'sel',
		menu: 'menu',
		closeDelay: 75,
		openDelay: 300
	},
	
	addMenu: function(el, parent) {
		if ( !el.parentNode ) this.root.appendChild( el );
		var p = el.parentNode;
		DOM.addClass(p,'parent');
		var a = this._getActivator(el);
		DOM.addClass(a,'trigger');
		var mi = { menu:el, parent:p, activator:a, timer:null }
		this._items.push(mi);
		return mi;
	},
	
	closeAll: function() {
		this._items.forEach( this.closeMenu, this);
	},
	
	onactivate: function (mi) {
		if (mi.timer) { mi.timer = this.clearTimer( mi.timer ); }
		mi.timer = setTimeout( function() { this.openMenu(mi) }.bind(this), this.config.openDelay );
	},
	
	ondeactivate: function(mi) {
		if (mi.timer) { mi.timer = this.clearTimer( mi.timer ); }
		mi.timer = setTimeout( function() { this.closeMenu(mi) }.bind(this), this.config.closeDelay );
	},
	
	openMenu: function (mi) {
		DOM.addClass( mi.parent, this.config.active );
		DOM.addClass( mi.menu, this.config.menu );
		DOM.addClass( mi.activator, this.config.selected );
		
	},
	
	closeMenu: function (mi) {
		DOM.removeClass(mi.parent,this.config.active);
		DOM.removeClass(mi.menu,this.config.menu);
		DOM.removeClass(mi.activator,this.config.selected);
		mi.timer = this.clearTimer(mi.timer);
	},
	
	clearTimer: function(t) {						
		clearTimeout(t);
		return t = null;
	}
	

},{ //begin static interface
	all: []
});


var DropDown = Menu.extend({
	constructor: function(el, config) {
		var uls = $(el).getElementsByTagName('UL');
		$A(uls).forEach( function(ul) { this.addMenu(ul) }, this);
		this.base();
	},

	addMenu: function(el, parent) {
		var mi = this.base(el, parent);
		Event.add(mi.parent,'mouseover', function(ev) { this.onactivate(mi); }, this);
		Event.add(mi.parent,'mouseout', function(ev) { this.ondeactivate(mi); }, this);
	}
	
}, {
	pageLoad: function() {
		DOM.getElementsByClass('dropdown').forEach( function(ddmenu) {
			return new DropDown(ddmenu);
		});
	}
});