var $ = DOM.get;
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;
			if ( !n.getElementsByTagName ) continue;
			var c = n.getElementsByTagName('a');
			if (c.length>0) return c[0];
		} 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);
		DOM.addClass( mi.menu, this.config.menu );
		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.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) {
		el = DOM.get(el);
		if (!el) return;
		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);
		return mi;
	}
	
}, {
	pageReady: function() {
		DOM.getElementsByClass('dropdown').forEach( function(ddmenu) {
			return new DropDown(ddmenu);
		});
		
	}
});

DOM.adopt = function(o, a) { o.appendChild( a.parentNode.removeChild(a) ); };
DropDown.implement({ addMenu: function(ul, parent) {

        var lis = ul.getElementsByTagName('li');
        var max = 8;
        var liCount = lis.length

        //divide up the content into two halves
        if ( liCount >= max  )
			liCount = liCount / 2;
                       
        //clone the current dropdown (but not children)
        var ul2 = ul.cloneNode(false);
        
        //divide up the items
        var count = 0;
        Array.from(lis).forEach(function(li,idx2) {
			if ( idx2 >= liCount ) {
				if (ul2.childNodes.length==0)
					count = 0;
				DOM.adopt(ul2,li);
			}
			if ( (count % 2) == 0)
				DOM.addClass(li,'c2');
			count++;
        });

        //exit if we are dealing with less than our max
        if ( ul2.childNodes.length==0)
			return this.base(ul, parent);
        
        //create a container to put our splits into
        var menuCont = document.createElement('div');
        ul.parentNode.appendChild(menuCont);

        DOM.addClass(ul, 'col0');
        DOM.addClass(ul2, 'col1');
                       
        //move the current menu into our container along with the new one
        DOM.adopt(menuCont, ul);
        menuCont.appendChild(ul2);
        
        
        //now work out height so that both menu's appear the same; make sure the fist menu is wide enough;
        var d1 = DOM.getDim(ul);
        var d2 = DOM.getDim(ul2);
                       
        if ( d1.height > d2.height )
                d2.height = d1.height;
        else
                d1.height = d2.height;
        d2.left = (d1.width);
        forEach(d1, function(val, idx, obj) { obj[idx] = val +'px'; });
        forEach(d2, function(val, idx, obj) { obj[idx] = val +'px'; });
        DOM.setStyle(ul, d1);
        DOM.setStyle(ul2, d2);
        return this.base(menuCont, menuCont.parentNode);
		}

});