(function($) { // Compliant with jquery.noConflict()
$.fn.jCarouselLite = function(o){

    o = $.extend({
        btnPrev: false,
        btnNext: false,
        btnGo: null,
        mouseWheel: false,
        auto: null,

        speed: 200,
        easing: null,

        vertical: false,
        circular: true,
        visible: 3,
        start: 0,
        scroll: 1,

        beforeStart: null,
        afterEnd: null
    }, o || {});

    return this.each(function(){ // Returns the element collection. Chainable.

        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;

        //alert('v :'+ v);
        //alert('tl :'+ tl);

        // 2012-02-09 - Mike: code this condition, otherwise display will be faulty if there are <= 5 items to display
        if(o.circular && tl > v)
        {
            ul.prepend(tLi.slice(tl-v-1+1).clone()).append(tLi.slice(0,v).clone());

            // if there are more items than the max. amount fits in one row
            // --> use this original code
            o.start += v;
        }

        div.hover(function(){

            div.hovered = true;
        },
        function(){

            div.hovered = false;
        });

        var li = $("li", ul), itemLength = li.size(), curr = o.start;
        div.css("visibility", "visible");

        //alert('itemLength: '+itemLength);

        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); // Full li size(incl margin)-Used for animation
        var ulSize = liSize * itemLength; // size of full ul(total length, not just for the visible items)
        var divSize = liSize * v; // size of entire div(total length for just the visible items)

        /*alert('liSize: '+liSize);
        alert('ulSize: '+ulSize);
        alert('divSize: '+divSize);*/

        li.css({width: li.width(), height: li.height()});

        // define size of UL, move
        ul.css(sizeCss, ulSize+"px");

        if(curr > 0)
        {
            //alert('curr: '+ curr);
            ul.css(animCss, -(curr*liSize));
        }

        div.css(sizeCss, divSize+"px"); // Width of the DIV. length of visible images

        if(o.btnPrev)
        {
            $(o.btnPrev).click(function() {
                div.navigated = true;
                return go(curr-o.scroll);
            });
        }

        if(o.btnNext)
        {
            $(o.btnNext).click(function(){
                div.navigated = true;
                return go(curr+o.scroll);
            });
        }

        if(o.btnGo)
        {
            $.each(o.btnGo, function(i, val) {
                $(val).click(function() {
                    div.navigated = true;
                    return go(o.circular ? o.visible+i : i);
                });
            });
        }

        if(o.mouseWheel && div.mousewheel)
        {
            div.mousewheel(function(e, d) {
                return d>0 ? go(curr-o.scroll) : go(curr+o.scroll);
            });
        }

        if(o.auto)
        {
            setInterval(function() {

                if(!div.hovered && !div.navigated)
                {
                    go(curr+o.scroll);
                }
            },

            o.auto+o.speed);
        }

        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 circular we are in first or last, then goto the other end
                    if(to<=o.start-v-1) { // If first, then goto last
                        ul.css(animCss, -((itemLength-(v*2))*liSize)+"px");
                        // If "scroll" > 1, then the "to" might not be equal to the condition; it can be lesser depending on the number of elements.
                        curr = to==o.start-v-1 ? itemLength-(v*2)-1 : itemLength-(v*2)-o.scroll;
                    } else if(to>=itemLength-v+1) { // If last, then goto first
                        ul.css(animCss, -( (v) * liSize ) + "px" );
                        // If "scroll" > 1, then the "to" might not be equal to the condition; it can be greater depending on the number of elements.
                        curr = to==itemLength-v+1 ? v+1 : v+o.scroll;
                    } else curr = to;
                } else { // If non-circular and to points to first or last, we just return.
                    if(to<0 || to>itemLength-v) return;
                    else curr = to;
                } // If neither overrides it, the curr will still be "to" and we can proceed.

                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;
                    }
                );

                // Disable buttons when the carousel reaches the last/first, and enable when not
                if(!o.circular)
                {
                    $(o.btnPrev).removeClass("carousel-prev-disabled");
                    $(o.btnNext).removeClass("carousel-next-disabled");
                    if(curr-o.scroll < 0) $(o.btnPrev).addClass("carousel-prev-disabled");
                    if(curr+o.scroll > itemLength-v) $(o.btnNext).addClass("carousel-next-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);