(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: true, // 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() {
                    //stop autoscroll
                    o.auto = false;
                    return go(curr - o.scroll);
                });
            }
            if (o.btnNext) {
                $(o.btnNext).click(function() {
                    o.auto = false;
                    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 (o.auto && (!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
                            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);