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


/* pawel maziarz: work around for ie logging */
if (!window.console) {
	var console = {
		log: function(msg) { 
	 }
	}
}
/* */
jQuery.SelectBox = function(selectobj, options) {

	var opt = options || {};
	opt.inputClass = opt.inputClass || "selectbox";
	opt.containerClass = opt.containerClass || "selectbox-wrapper";
	opt.hoverClass = opt.hoverClass || "current";
	opt.currentClass = opt.currentClass || "selected";
  opt.onChangeCallback = opt.onChangeCallback || false;
  opt.onChangeParams = opt.onChangeParams || false;
	opt.debug = opt.debug || false;

	var countSelectBox=$(".selectbox").length+1;
	var elm_id = selectobj.id || "selectbox"+countSelectBox;
	selectobj.id = elm_id;

	var active = 0;
	var inFocus = false;
	var hasfocus = 0;
	//jquery object for select element
	var $select = jQuery(selectobj);
	// jquery container object
	var $container = setupContainer(opt);
	$container.attr('rel', $(selectobj).attr('rel'));
	//jquery input object 
	var $input = setupInput(opt);
	// hide select and append newly created elements
	$select.hide().before($input);
	$("body").append('<div style="position:absolute;z-index:100000;" class="comboAbsoDiv"></div>');
	$("body div:last").append($container);


	init();
	
	$input
	.click(function(){

		setTimeout(function(){

			var parent = $container.parent().parent();
	    if( !parent.is(':visible') ) {
				$(".selectbox-wrapper").each(function(){
					var p = $(this).parent().parent();
				  if( p.is('.comboAbsoDiv') ) p.hide();
				});
	      inFocus = true;
	      parent.show();
		  	positionInput();
	    }else{
				if( parent.is('.comboAbsoDiv') ) parent.hide();
			}

		},50);
	})
	.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 !
				$('li.'+opt.hoverClass).trigger('click');
				break;
			case 27: //escape
			  hideMe();
			  break;
		}
	})
	.blur(function() {
		if( $(this).attr('class') == 'selectbox' ) return;
		if ($container.parent().parent().is(':visible') && hasfocus > 0 ) {
			if(opt.debug) console.log('container visible and has focus')
		} else {
		  // Workaround for ie scroll - thanks to Bernd Matzner
      if((jQuery.browser.msie && jQuery.browser.version.substr(0,1) < 8) || jQuery.browser.safari){ // check for safari too - workaround for webkit
      	if(document.activeElement.getAttribute('id').indexOf('_container')==-1){
        	hideMe();
        } else {
        	$input.focus();
        }
      } else {
      	hideMe();
      }
		}
	});


	function positionInput(){
			var off = $input.offset();
			var top=off.top, left=off.left+2;
			var p = $container.parent().parent();
			if( p.is('.comboAbsoDiv') ){ 
				top -= p.height()+2;
				p.css({top: top, left: left});
			}
	}

	function hideMe() { 
		hasfocus = 0;
		var el = $container.parent().parent();
		if( el.is('.comboAbsoDiv') ) el.hide();
	}
	
	function init() {
		$container.append(getSelectOptions($input.attr('id')));
		var width = $input.css('width');
		$container.width(width);
  }
	
	function setupContainer(options) {
		var container = document.createElement("div");
		$container = jQuery(container);
		$container.attr('id', elm_id+'_container');
		$container.addClass(options.containerClass);
		return $container;
	}
	
	function setupInput(options) {
		var input = document.createElement("input");
		var $input = jQuery(input);
		$input.attr("id", elm_id+"_input");
		$input.attr("type", "text");
		$input.addClass(options.inputClass);
		$input.attr("autocomplete", "off");
		$input.attr("readonly", "readonly");
		$input.attr("tabIndex", $select.attr("tabindex")); // "I" capital is important for ie
    $input.css("width", $select.css("width"));
		return $input;	
	}
	
	function moveSelect(step) {
		var lis = jQuery("li", $container);
		if (!lis || lis.length == 0) return false;
		active += step;
    //loop through list
		if (active < 0) {
			active = lis.size();
		} else if (active > lis.size()) {
			active = 0;
		}
        scroll(lis, active);
		lis.removeClass(opt.hoverClass);

		jQuery(lis[active]).addClass(opt.hoverClass);
	}
	
	function scroll(list, active) {
      var el = jQuery(list[active]).get(0);
      var list = $container.get(0);
      
      if (el.offsetTop + el.offsetHeight > list.scrollTop + list.clientHeight) {
        list.scrollTop = el.offsetTop + el.offsetHeight - list.clientHeight;      
      } else if(el.offsetTop < list.scrollTop) {
        list.scrollTop = el.offsetTop;
      }
	}
	
	function setCurrent() {	
		var li = jQuery("li."+opt.currentClass, $container).get(0);
		var ar = (''+li.id).split('_');
		var el = ar[ar.length-1];
		//$select.val(el);
    $select.get(0).selectedIndex = $('li', $container).index(li);
		$input.val($(li).html());
    opt.onChangeParams = { selectedVal : $select.val(), PanID: $container.attr('rel')  };
    if (opt.onChangeCallback) opt.onChangeCallback(opt.onChangeParams);
		return true;
	}
	
	// select value
	function getCurrentSelected() {
		return $select.val();
	}
	
	// input value
	function getCurrentValue() {
		return $input.val();
	}
	
	function getSelectOptions(parentid) {
		var select_options = new Array();
		var ul = document.createElement('ul');
		$select.children('option').each(function() {
			var li = document.createElement('li');
			li.setAttribute('id', parentid + '_' + $(this).val());
			li.innerHTML = $(this).html();
			if ($(this).is(':selected')) {
				$input.val($(this).html());
				$(li).addClass(opt.currentClass);
			}
			ul.appendChild(li);
			$(li)
			.mouseover(function(event) {
				hasfocus = 1;
				if (opt.debug) console.log('over on : '+this.id);
				jQuery(event.target, $container).addClass(opt.hoverClass);
			})
			.mouseout(function(event) {
				hasfocus = -1;
				if (opt.debug) console.log('out on : '+this.id);
				jQuery(event.target, $container).removeClass(opt.hoverClass);
			})
			.click(function(event) {
			  var fl = $('li.'+opt.hoverClass, $container).get(0);
				if (opt.debug) console.log('click on :'+this.id);
				$('li.'+opt.currentClass, $container).removeClass(opt.currentClass); 
				$(this).addClass(opt.currentClass);
				setCurrent();
				//$select.change();
				$select.get(0).blur();
				hideMe();
			});
		});
		return ul;
	}
	
	$(window).scroll(positionInput);
	$(window).resize(positionInput);
		
};