jQuery.fn.extend({
	selectbox: function(options) {
		return this.each(function() {
			new jQuery.SelectBox(this, options);
		});
	}
});

jQuery.SelectBox = function(selectobj, options) {

	var opt = $.extend({inputClass: "selectbox", containerClass: "selectbox-wrapper", hoverClass: "selected", another: false}, options || {});

	var elm_id = selectobj.id;
	var active = -1;
	var inFocus = false;
	var hasfocus = 0;
	//jquery object for select element
	var $select = $(selectobj);
	// jquery container object
	var $container = setupContainer(opt);
	//jquery input object
	var $input = setupInput(opt);
	// hide select and append newly created elements
	$select.hide().before($input).before($container);


	init();

	$input
	.click(function(){
        if (!inFocus) {
		  $container.toggle();
		}
	})
	.focus(function(){
	   if ($container.not(':visible')) {
	       inFocus = true;
	       $container.show();
	   }
	})
	.keydown(function(event) {
		switch(event.keyCode) {
			case 38: // up
				event.preventDefault();
				moveSelect(-1);
				break;
			case 40: // down
				event.preventDefault();
				moveSelect(1);
				break;
			//case 9:  // tab
			case 13: // return
				event.preventDefault(); // seems not working in mac !
				setCurrent();
				hideMe();
				break;
		}
	})
	.blur(function() {
		if (!($container.is(':visible') && hasfocus > 0 )) {
			hideMe();
		}
	});


	function hideMe() {
		hasfocus = 0;
		$container.hide();
	}

	function init() {
		$container.append(getSelectOptions($input.attr('id'))).hide();
		var width = $input.css('width');
		$container.width(width);
    }

	function setupContainer(opt) {
		var $container = $(document.createElement("div"));
		$container.attr('id', elm_id+'_container').addClass(opt.containerClass);
		return $container;
	}

	function setupInput(options) {
		var $input = $(document.createElement("input"));
		$input
			.attr({id: elm_id + "_input", type: "text", autocomplete: "off", tabIndex: $select.attr("tabindex"), readonly: "readonly"})
			.addClass(options.inputClass);

		return $input;
	}

	function moveSelect(step) {
		var lis = $("li", $container);
		if (!lis) return;

		active += step;

		if (active < 0) {
			active = 0;
		} else if (active >= lis.size()) {
			active = lis.size() - 1;
		}

		lis.removeClass(opt.hoverClass);

		$(lis[active]).addClass(opt.hoverClass);
	}

	function setCurrent() {
		var li = $("li."+opt.hoverClass, $container).get(0);
		var ar = (''+li.id).split('_');
		var el = ar[ar.length-1];
		$select.val(el);
		$input.val($(li).html());
		$input.attr("readonly", "readonly");
		return true;
	}

	// select value
	function getCurrentSelected() {
		return $select.val();
	}

	// input value
	function getCurrentValue() {
		return $input.val();
	}

	function create_li(id, ul, e) {
		var li = document.createElement('li');
		if(e) {
			li.setAttribute('id', id + '_' + e.val());
			li.innerHTML = e.html();
			if (e.is(':selected')) {
				$input.val(e.html());
				$(li).addClass(opt.hoverClass);
			}
		} else {
			li.innerHTML = '[#:option_another]';
		}

		ul.appendChild(li);
		$(li)
			.mouseover(function(event) {
				hasfocus = 1;
				jQuery(event.target, $container).addClass(opt.hoverClass);
			})
			.mouseout(function(event) {
				hasfocus = -1;
				jQuery(event.target, $container).removeClass(opt.hoverClass);
			})
			.click(function(event) {
				if(e) {
					e.addClass(opt.hoverClass);
					setCurrent();
				} else {
					$input.removeAttr("readonly").val('').focus();
				}
				hideMe();
			});
	}

	function getSelectOptions(id) {
		var select_options = new Array();
		var ul = document.createElement('ul');
		$select.children('option').each(function() { create_li(id, ul, $(this)); });
		if(opt.another) create_li(id, ul);
		return ul;
	}

};