var Sorter = Class.create({
	initialize: function(element,columns){
		this.table=element;
		this.des=new SortableTable(element,columns);
		this.asc= new SortableTableOne(element,columns);
		this.initDOMReferences();
		this.lastColumnOrder=null;
	},
	initDOMReferences: function(){
		this.handler = this.order.bind(this);
		var headerColumns = this.table.down('thead').childElements()[1].childElements();

		headerColumns.each(function(column,i){
			column._id = i+1;
			column._orderId = parseInt(((i+1)/2).toFixed(0))-1;
		});
		this.table.observe('click',this.handler);
	},
	order: function(e){
		var element = e.element();
		if('_id' in element){
			if (element.className.endsWith('up')){
				this.up(element);
			}else{
				this.down(element);
			}
		}
	},
	sortByIndex:function(index){
		var i = parseInt(((index)/2).toFixed(0))-1;
		if ((index%2) > 0){
			this.up(i);
		}else{
			this.down(i);
		}
	},
	up: function(column){
		if (this.shouldSort(column)){
			this.des.sort(column._orderId);
			this.toggle(this.lastColumnOrder);
			this.toggle(column);
			this.lastColumnOrder = column;
		}
	},
	down: function(column){
		downEvent++;
		if (this.shouldSort(column)){
			this.asc.sort(column._orderId);
			this.toggle(this.lastColumnOrder);
			this.toggle(column);
			this.lastColumnOrder = column;
		}
	},
	toggle: function(column){
		if(column != null){
			if (column.className.endsWith('up')){
				 column.className = (column.className == "selectedup"?"up":"selectedup");
			}else{
				column.className = (column.className == "selecteddown"?"down":"selecteddown");
			}
		}
	},
	shouldSort: function(column){
		var value = false;
		if (this.lastColumnOrder == null){
			value=true;
		}else if ((this.lastColumnOrder._id != column._id)){
			value=true;
		}
		return value;
	}
}); //Sorter Class