/* jQuery.jcarousellite */

(function($){
  $.fn.jCarouselLite=function(o){
    o=$.extend({
      btnPrev:null,
      btnNext:null,
      btnGo:null,
      mouseWheel:false,
      auto:null,
      speed:200,
      interval:2000,
      easing:null,
      vertical:false,
      circular:true,
      visible:3,
      start:0,
      scroll:1,
      beforeStart:null,
      afterEnd:null
    },o||{} );
    
    return this.each(function(){    	
      var running=false,
        animCss=o.vertical?"top":"left",
        sizeCss=o.vertical?"height":"width";
        var div=$(this),
        ul=$("ul",div),
        tLi=$("li",ul),
        tl=tLi.size(),
        v=o.visible;
        
      if(o.circular){
        ul.prepend(tLi.slice(tl-v-1+1).clone()).append(tLi.slice(0,v).clone());
        o.start+=v
      }
        
      var li=$("li",ul),
      itemLength=li.size(),
      curr=o.start;
      div.css("visibility","visible");
      li.css({
      	overflow:"hidden",
      	float:o.vertical?"none":"left"
      });
      
      ul.css({
      	margin:"0",
      	padding:"0",
      	position:"relative",
      	"list-style-type":"none",
      	"z-index":"1"
      });
      
      div.css({
      	overflow:"hidden",
      	position:"relative",
      	"z-index":"2",left:"0px"
      });
      
      var liSize=o.vertical?height(li):width(li);
      var ulSize=liSize*itemLength;
      var divSize=liSize*v;li.css({
      	width:li.width(),
      	height:li.height()
      });
      
      ul.css(sizeCss,ulSize+"px").css(animCss,-(curr*liSize));
      div.css(sizeCss,divSize+"px");
      
      // PREV
      if(o.btnPrev)$(o.btnPrev).click(function(){
      	var i=curr-o.scroll;
      	if(o.btnGo){
      		var r=i%tl;
      		var j=(r==0)?tl:r;$(o.btnGo).find('a').removeClass('active');
      		$(o.btnGo).find('a').eq(j-1).addClass('active')
      	}
      	
      	return go(i)
      });
      
      // NEXT
      if(o.btnNext)$(o.btnNext).click(function(){
      	var i=curr+o.scroll;
      	if(o.btnGo){
      		var r=i%tl;
      		var j=(r==0)?tl:r;
      		$(o.btnGo).find('a').removeClass('active');
      		$(o.btnGo).find('a').eq(j-1).addClass('active')
      	}
      	return go(i)
      });
      
      // BTN GO
      if(o.btnGo) {
      	var btns=$(o.btnGo).find('a');
      
	      $.each(btns,function(i,val){
	      	$(val).click(function(){
	      		$(this).parent().parent().find('a').removeClass('active');
	      		$(this).addClass('active');
	      		return go(o.circular?o.visible+i:i)
	      	})
	      });
      }
      
      // MOUSE
      if(o.mouseWheel&&div.mousewheel)div.mousewheel(function(e,d){
      	return d>0?go(curr-o.scroll):go(curr+o.scroll)
      });      
      
      // AUTO
      if(o.auto)setInterval(function(){
      	var i=curr+o.scroll;
      	if(o.btnGo){
      		var r=i%tl;
      		var j=(r==0)?tl:r;
      		$(o.btnGo).find('a').removeClass('active');
      		$(o.btnGo).find('a').eq(j-1).addClass('active')
      	}
      	go(i)
      },o.auto+o.interval);
      
      function vis(){
      	return li.slice(curr).slice(0,v)
      };
      
      function go(to){
      	if(!running){
      		if(o.beforeStart)o.beforeStart.call(this,vis());
      		if(o.circular){
      			if(to<=o.start-v-1){
      				ul.css(animCss,-((itemLength-(v*2))*liSize)+"px");
      				curr=to==o.start-v-1?itemLength-(v*2)-1:itemLength-(v*2)-o.scroll
      			}else if(to>=itemLength-v+1){
      				ul.css(animCss,-((v)*liSize)+"px");
      				curr=to==itemLength-v+1?v+1:v+o.scroll
      			}else 
      				curr=to
      		}else{
      			if(to<0||to>itemLength-v)
      				return;
      			else curr=to
      		}
      		running=true;      			
      		ul.animate(
      			animCss=="left"?{left:-(curr*liSize)}:{top:-(curr*liSize)},
      			o.speed,o.easing,function(){
      				if(o.afterEnd)
      					o.afterEnd.call(this,vis());
      				running=false
      		});
      		
      		if(!o.circular){
      			$(o.btnPrev+","+o.btnNext).removeClass("disabled");
      			$((curr-o.scroll<0&&o.btnPrev)||(curr+o.scroll>itemLength-v&&o.btnNext)||[]).addClass("disabled")
      		}
      	}
      	return false
      }
    }
   )};
   
   function css(el,prop){
  	 return parseInt($.css(el[0],prop))||0
  	};
  	 
  function width(el){
  	return el[0].offsetWidth+css(el,'marginLeft')+css(el,'marginRight')
  };
  
  function height(el){
  	return el[0].offsetHeight+css(el,'marginTop')+css(el,'marginBottom')
  }
  
})(jQuery);