/**
***************************************************************************************************************
* THIS CODE WAS MODIFIED FROM THE ORIGINAL IN ORDER TO FIX A NAVIGATION BUG WHEN THE CIRCULAR OPTION IS FALSE *
***************************************************************************************************************
*
*
*
*
* 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
*/

/**
* Creates a carousel-style navigation widget for images/any-content from a simple HTML markup.
*
* The HTML markup that is used to build the carousel can be as simple as...
*
*  <div class="carousel">
*      <ul>
*          <li><img src="image/1.jpg" alt="1"></li>
*          <li><img src="image/2.jpg" alt="2"></li>
*          <li><img src="image/3.jpg" alt="3"></li>
*      </ul>
*  </div>
*
* As you can see, this snippet is nothing but a simple div containing an unordered list of images.
* You don't need any special "class" attribute, or a special "css" file for this plugin.
* I am using a class attribute just for the sake of explanation here.
*
* To navigate the elements of the carousel, you need some kind of navigation buttons.
* For example, you will need a "previous" button to go backward, and a "next" button to go forward.
* This need not be part of the carousel "div" itself. It can be any element in your page.
* Lets assume that the following elements in your document can be used as next, and prev buttons...
*
* <button class="prev">&lt;&lt;</button>
* <button class="next">&gt;&gt;</button>
*
* Now, all you need to do is call the carousel component on the div element that represents it, and pass in the
* navigation buttons as options.
*
* $(".carousel").jCarouselLite({
*      btnNext: ".next",
*      btnPrev: ".prev"
* });
*
* That's it, you would have now converted your raw div, into a magnificient carousel.
*
* There are quite a few other options that you can use to customize it though.
* Each will be explained with an example below.
*
* @param an options object - You can specify all the options shown below as an options object param.
*
* @option btnPrev, btnNext : string - no defaults
* @example
* $(".carousel").jCarouselLite({
*      btnNext: ".next",
*      btnPrev: ".prev"
* });
* @desc Creates a basic carousel. Clicking "btnPrev" navigates backwards and "btnNext" navigates forward.
*
* @option btnGo - array - no defaults
* @example
* $(".carousel").jCarouselLite({
*      btnNext: ".next",
*      btnPrev: ".prev",
*      btnGo: [".0", ".1", ".2"]
* });
* @desc If you don't want next and previous buttons for navigation, instead you prefer custom navigation based on
* the item number within the carousel, you can use this option. Just supply an array of selectors for each element
* in the carousel. The index of the array represents the index of the element. What i mean is, if the
* first element in the array is ".0", it means that when the element represented by ".0" is clicked, the carousel
* will slide to the first element and so on and so forth. This feature is very powerful. For example, i made a tabbed
* interface out of it by making my navigation elements styled like tabs in css. As the carousel is capable of holding
* any content, not just images, you can have a very simple tabbed navigation in minutes without using any other plugin.
* The best part is that, the tab will "slide" based on the provided effect. :-)
*
* @option mouseWheel : boolean - default is false
* @example
* $(".carousel").jCarouselLite({
*      mouseWheel: true
* });
* @desc The carousel can also be navigated using the mouse wheel interface of a scroll mouse instead of using buttons.
* To get this feature working, you have to do 2 things. First, you have to include the mouse-wheel plugin from brandon.
* Second, you will have to set the option "mouseWheel" to true. That's it, now you will be able to navigate your carousel
* using the mouse wheel. Using buttons and mouseWheel or not mutually exclusive. You can still have buttons for navigation
* as well. They complement each other. To use both together, just supply the options required for both as shown below.
* @example
* $(".carousel").jCarouselLite({
*      btnNext: ".next",
*      btnPrev: ".prev",
*      mouseWheel: true
* });
*
* @option auto : number - default is null, meaning autoscroll is disabled by default
* @example
* $(".carousel").jCarouselLite({
*      auto: 800,
*      speed: 500
* });
* @desc You can make your carousel auto-navigate itself by specfying a millisecond value in this option.
* The value you specify is the amount of time between 2 slides. The default is null, and that disables auto scrolling.
* Specify this value and magically your carousel will start auto scrolling.
*
* @option speed : number - 200 is default
* @example
* $(".carousel").jCarouselLite({
*      btnNext: ".next",
*      btnPrev: ".prev",
*      speed: 800
* });
* @desc Specifying a speed will slow-down or speed-up the sliding speed of your carousel. Try it out with
* different speeds like 800, 600, 1500 etc. Providing 0, will remove the slide effect.
*
* @option easing : string - no easing effects by default.
* @example
* $(".carousel").jCarouselLite({
*      btnNext: ".next",
*      btnPrev: ".prev",
*      easing: "bounceout"
* });
* @desc You can specify any easing effect. Note: You need easing plugin for that. Once specified,
* the carousel will slide based on the provided easing effect.
*
* @option vertical : boolean - default is false
* @example
* $(".carousel").jCarouselLite({
*      btnNext: ".next",
*      btnPrev: ".prev",
*      vertical: true
* });
* @desc Determines the direction of the carousel. true, means the carousel will display vertically. The next and
* prev buttons will slide the items vertically as well. The default is false, which means that the carousel will
* display horizontally. The next and prev items will slide the items from left-right in this case.
*
* @option circular : boolean - default is true
* @example
* $(".carousel").jCarouselLite({
*      btnNext: ".next",
*      btnPrev: ".prev",
*      circular: false
* });
* @desc Setting it to true enables circular navigation. This means, if you click "next" after you reach the last
* element, you will automatically slide to the first element and vice versa. If you set circular to false, then
* if you click on the "next" button after you reach the last element, you will stay in the last element itself
* and similarly for "previous" button and first element.
*
* @option visible : number - default is 3
* @example
* $(".carousel").jCarouselLite({
*      btnNext: ".next",
*      btnPrev: ".prev",
*      visible: 4
* });
* @desc This specifies the number of items visible at all times within the carousel. The default is 3.
* You are even free to experiment with real numbers. Eg: "3.5" will have 3 items fully visible and the
* last item half visible. This gives you the effect of showing the user that there are more images to the right.
*
* @option start : number - default is 0
* @example
* $(".carousel").jCarouselLite({
*      btnNext: ".next",
*      btnPrev: ".prev",
*      start: 2
* });
* @desc You can specify from which item the carousel should start. Remember, the first item in the carousel
* has a start of 0, and so on.
*
* @option scrool : number - default is 1
* @example
* $(".carousel").jCarouselLite({
*      btnNext: ".next",
*      btnPrev: ".prev",
*      scroll: 2
* });
* @desc The number of items that should scroll/slide when you click the next/prev navigation buttons. By
* default, only one item is scrolled, but you may set it to any number. Eg: setting it to "2" will scroll
* 2 items when you click the next or previous buttons.
*
* @option beforeStart, afterEnd : function - callbacks
* @example
* $(".carousel").jCarouselLite({
*      btnNext: ".next",
*      btnPrev: ".prev",
*      beforeStart: function(a) {
*          alert("Before animation starts:" + a);
*      },
*      afterEnd: function(a) {
*          alert("After animation ends:" + a);
*      }
* });
* @desc If you wanted to do some logic in your page before the slide starts and after the slide ends, you can
* register these 2 callbacks. The functions will be passed an argument that represents an array of elements that
* are visible at the time of callback.
*
*
* @cat Plugins/Image Gallery
* @author Ganeshji Marwaha/ganeshread@gmail.com
*/

(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,

      beforeStart: null,
      afterEnd: null,
      disabled: false
    }, 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;

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

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

      li.css({ 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)

      if (ulSize < divSize) {
        o.disabled = true;
      }

      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.disabled) {
        hideButtons();
      } else {
        if (o.btnPrev) {
          var jqo_btnPrev = $(o.btnPrev);
          jqo_btnPrev.click(function() {
            return go(curr - o.scroll);
          });
          jqo_btnPrev.mousedown(function() {
            jqo_btnPrev.addClass('Depressed');
          });
          jqo_btnPrev.mouseup(function() {
            jqo_btnPrev.removeClass('Depressed');
          });
        }

        if (o.btnNext) {
          var jqo_btnNext = $(o.btnNext);
          jqo_btnNext.click(function() {
            return go(curr + o.scroll);
          });
          jqo_btnNext.mousedown(function() {
            jqo_btnNext.addClass('Depressed');
          });
          jqo_btnNext.mouseup(function() {
            jqo_btnNext.removeClass('Depressed');
          });
        }

        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);

        go(0);
      }

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

      function hideButtons() {
        $(o.btnPrev + "," + o.btnNext).addClass("Hidden");
      }

      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 (to < 0) {
              // Go to first element.
              curr = 0;
            } else if (to > itemLength - v) {
              // Go to last element minus visible.
              curr = Math.ceil(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");
            if (curr <= 0) {
              // Disable previous button
              $(o.btnPrev).addClass("Disabled");
            }
            if (curr + v > itemLength) {
              // Disable previous button
              $(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);