(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: 1000,
      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: 2000, // 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() {
          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() {
        clearTimeout(setAutoAdvance);
        div.data('paused', true);
      })
      .bind('resumeCarousel', function() {
        advancer();
        div.data('paused', true);
      });
        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 + "," + 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);