(function($) {
    /**
* jCarouselLite - jQuery plugin to navigate images/any content in a carousel style widget.
* @requires jQuery v1.2 or above
*
* @author Ganeshji Marwaha
* @author Karl Swedberg (modifications/enhancements)
*
*
* http://gmarwaha.com/jquery/jcarousellite/
*
* Copyright (c) 2007 Ganeshji Marwaha (gmarwaha.com)
* Dual licensed under the MIT and GPL licenses:
* http://www.opensource.org/licenses/mit-license.php
* http://www.gnu.org/licenses/gpl.html
*
* Version: 1.1
* Note: Requires jquery 1.2 or above from version 1.0.1
*/

    $.jCarouselLite = {
        version: '1.1',
        defaults: {
            btnPrev: null,
            btnNext: null,
            btnGo: null,
            mouseWheel: false,

            speed: 200,
            easing: null,
            auto: false, // true to enable auto scrolling
            autoStop: false, // number of times before autoscrolling will stop. (if circular is false, won't iterate more than number of items)
            timeout: 4000, // milliseconds between scrolls
            pause: false, // pause scrolling on hover

            vertical: false,
            circular: true, // continue scrolling when reach the last item
            visible: 3,
            start: 0, // index of item to show initially in the first posiition
            scroll: 1, // number of items to scroll at a time

            beforeStart: null,
            afterEnd: null
        }
    };

    $.fn.jCarouselLite = function(options) {
        var o = $.extend({}, $.jCarouselLite.defaults, options);

        return this.each(function() {

            var running = false,
            animCss=o.vertical?"top":"left",
            sizeCss=o.vertical?"height":"width";

            var div = $(this), ul = div.find('ul'), tLi = ul.children('li'), tl = tLi.length, v = o.visible;

            if (o.circular) {
                ul.prepend(tLi.slice(tl-v-1+1).clone(true))
                .append(tLi.slice(0,v).clone(true));
                o.start += v;
            }

            var li = ul.children('li'), itemLength = li.length, curr = o.start;
            div.css("visibility", "visible");

            li.css({
                overflow: o.vertical ? "hidden" : 'visible',
                '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)

            li.css({
                width: li.width(),
                height: li.height()
            });
            ul.css(sizeCss, ulSize+"px").css(animCss, -(curr*liSize));

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

            if (o.btnPrev) {
                $(o.btnPrev).click(function() {
                    return go(curr-o.scroll);
                });
            }
            if (o.btnNext) {
                $(o.btnNext).click(function() {
                    return go(curr+o.scroll);
                });
            }
            if (o.btnGo) {
                $.each(o.btnGo, function(i, val) {
                    $(val).click(function() {
                        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) {
                // CHANGED: Added pause on hover (Karl Swedberg)
                var setAutoAdvance,
                advanceCounter = 0,
                autoStop = iterations(tl,o);

                var advancer = function() {
                    setAutoAdvance = setTimeout(function() {
                        if (!autoStop || autoStop > advanceCounter) {
                            go(curr+o.scroll);
                            advanceCounter++;
                            advancer();
                        }
                    }, o.timeout+o.speed);
                };

                advancer();

                $(document)
                .bind('pauseCarousel', function(event) {
                    clearTimeout(setAutoAdvance);
                    $(event.target).data('paused', true);
                })
                .bind('resumeCarousel', function(event) {
                    advancer();
                    $(event.target).data('paused', false);
                });
                if (o.pause) {
                    div.mouseenter(function() {
                        div.trigger('pauseCarousel');
                    }).mouseleave(function() {
                        div.trigger('resumeCarousel');
                    });
                }
            }

            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
                            //var tli = ul.find(".carousel-item").length/3;
                            ul.find("li").eq(3).children(".before").hide();
                            ul.find("li").eq(3).children(".after").show();
                            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 beyond first or last, we change to first or last.
                        if (to<0) {
                            curr = 0;
                        } else if (to>itemLength-v) {
                            curr = itemLength-v;
                        } 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;
                    });
                    // Disable buttons when the carousel reaches the last/first, and enable when not
                    if (!o.circular) {
                        $(o.btnPrev).add(o.btnNext).removeClass("disabled");
                        $( (curr-o.scroll<0 && o.btnPrev)
                            ||
                            (curr+o.scroll > itemLength-v && o.btnNext)
                            ||
                            []
                            ).addClass("disabled");
                    }
                }
                return false;
            } // end if !running
        });
    };

    function css(el, prop) {
        return parseInt($.css(el[0], prop), 10) || 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');
    }
    function iterations(itemLength, options) {
        return options.autoStop && (options.circular ? options.autoStop : Math.min(itemLength, options.autoStop));
    }
})(jQuery);