/**
 * jCarouselLite - jQuery plugin to navigate images/any content in a carousel style widget.
 * @requires jQuery v1.2 or above
 *
 * 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: 1.0.1
 * Note: Requires jquery 1.2 or above from version 1.0.1
 */


(function($) {                                          // Compliant with jquery.noConflict()
  $.fn.jCarouselLite = function(o) {
    o = $.extend({
      btnPrev: null,
      btnNext: null,
      btnGo: null,
      mouseWheel: false,
      auto: null,

      speed: 200,
      easing: null,

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

      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, paused = 0;

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

      // Set pause flag
      o.pauseOnHover ? ul.hover(function() { paused = 1 }, function() { paused = 0 }) : "";

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

      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)

      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)
        setInterval(function() {
          go(curr + o.scroll);
        }, o.auto + o.speed);

      function vis() {
        return li.slice(curr).slice(0, v);
      };

      function go(to) {
        if (!running && !paused) {

          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 + "," + o.btnNext).removeClass("disabled");
            $((curr - o.scroll < 0 && o.btnPrev)
						||
					   (curr + o.scroll > itemLength - v && o.btnNext)
						||
					   []
					 ).addClass("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);