/*!
 * jQuery jCarousellite Plugin v1.3.1
 *
 * Date: Mon Dec 6 19:36:31 2010 -0500
 * Requires: jQuery v1.4+
 *
 * Copyright 2007 Ganeshji Marwaha (gmarwaha.com)
 * Modifications/enhancements by Karl Swedberg
 * Dual licensed under the MIT and GPL licenses (just like jQuery):
 * http://www.opensource.org/licenses/mit-license.php
 * http://www.gnu.org/licenses/gpl.html
 *
 * jQuery plugin to navigate images/any content in a carousel style widget.
 *
*/

(function($) {

$.jCarouselLite = {
  version: '1.3.1'
};

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

  return this.each(function() {

    var running = false,
        animCss=o.vertical?"top":"left",
        aniProps = {},
        sizeCss=o.vertical?"height":"width",
        self = this,
        div = $(this),
        ul = div.find('ul').eq(0),
        tLi = ul.children('li'),
        tl = tLi.length,
        v = o.visible,
        start = Math.min(o.start, tl-1);

    if (o.circular) {
        ul.prepend(tLi.slice(tl-v-1+1).clone(true))
          .append(tLi.slice(0,v).clone(true));
        start += v;
    }
    var li = ul.children('li'),
        itemLength = li.length,
        curr = 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", listStyleType: "none", zIndex: 1});
    div.css({overflow: "hidden", position: "relative", zIndex: 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

    // CHANGED: bind click handlers to prev and next buttons, if set (Karl Swedberg)
    $.each([ 'btnPrev', 'btnNext' ], function(index, btn) {
      if ( o[btn] ) {
        o['$' + btn] = $.isFunction( o[btn] ) ? o[btn].call( div[0] ) : $( o[btn] );

        o['$' + btn].bind('click.jc', function() {
          var step = index == 0 ? curr-o.scroll : curr+o.scroll;
          return go( step );
        });
      }
    });

    if (!o.circular) {
      if (o.btnPrev && start == 0) {
        o.$btnPrev.addClass(o.btnDisabledClass);
      }
      if ( o.btnNext && start + o.visible >= itemLength ) {
        o.$btnNext.addClass(o.btnDisabledClass);
      }
    }
    if (o.btnGo) {
      $.each(o.btnGo, function(i, val) {
        $(val).bind('click.jc', function() {
          return go(o.circular ? o.visible+i : i);
        });
      });
    }

    if (o.mouseWheel && div.mousewheel) {
      div.bind('mousewheel.jc', 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 advanceCounter = 0,
          autoStop = iterations(tl,o);

      var advancer = function() {
        self.setAutoAdvance = setTimeout(function() {

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

      advancer();

      div
      .bind('pauseCarousel.jc', function(event) {
        clearTimeout(self.setAutoAdvance);
        div.data('pausedjc', true);
      })
      .bind('resumeCarousel.jc', function(event) {
        advancer();
        div.removeData('pausedjc');
      });

      if (o.pause) {
        div.bind('mouseenter.jc', function() {
          div.trigger('pauseCarousel');
        }).bind('mouseleave.jc', 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<=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==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;
          }

        // If non-circular and to points beyond first or last, we change to first or last.
        } else {
          // Disable buttons when the carousel reaches the last/first, and enable when not
          o.$btnPrev.toggleClass(o.btnDisabledClass, o.btnPrev && to <= 0);
          o.$btnNext.toggleClass(o.btnDisabledClass, o.btnNext && to > itemLength-v);

          if (to<0) {
            curr = 0;
          } else if  (to>itemLength-v) {
            curr = itemLength-v;
          } else {
            curr = to;
          }
        }

        running = true;
        aniProps[animCss] = -(curr*liSize);

        ul.animate(aniProps, o.speed, o.easing, function() {
          if (o.afterEnd) {
            o.afterEnd.call(this, vis());
          }
          running = false;
        });

      }
      return false;
    } // end if !running

    div.bind('endCarousel.jc', function() {
      if (self.setAutoAdvance) {
        clearTimeout(self.setAutoAdvance);
      }
      if (o.btnPrev) {
        o[$btnPrev].addClass(o.btnDisabledClass).unbind('.jc');
      }
      if (o.btnNext) {
        o[$btnNext].addClass(o.btnDisabledClass).unbind('.jc');
      }
      if (o.btnGo) {
        $.each(o.btnGo, function(i, val) {
          $(val).unbind('.jc');
        });
      }
      if (self.setAutoAdvance) {
        self.setAutoAdvance = null;
      }
      div.removeData('pausejc');
      div.unbind('.jc');
    });
  });
};
$.fn.jCarouselLite.defaults = {
  btnPrev: null,
  btnNext: null,
  btnDisabledClass: 'disabled',
  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
};

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);