/*! Copyright (c) 2008 Brandon Aaron (http://brandonaaron.net)
* Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php)
* and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.
* Thanks to: http://adomas.org/javascript-mouse-wheel/ for some pointers.
* Thanks to: Mathias Bank(http://www.mathias-bank.de) for a scope bug fix.
*
* Version: 3.0.1-pre
*
* Requires: 1.2.2+
*/
 
(function($) {
 
$.event.special.mousewheel = {
  setup: function() {
    var handler = $.event.special.mousewheel.handler;
    
    // Fix pageX, pageY, clientX and clientY for mozilla
    if ( $.browser.mozilla )
      $(this).bind('mousemove.mousewheel', function(event) {
        $.data(this, 'mwcursorposdata', {
          pageX: event.pageX,
          pageY: event.pageY,
          clientX: event.clientX,
          clientY: event.clientY
        });
      });
  
    if ( this.addEventListener )
      this.addEventListener( ($.browser.mozilla ? 'DOMMouseScroll' : 'mousewheel'), handler, false);
    else
      this.onmousewheel = handler;
  },
  
  teardown: function() {
    var handler = $.event.special.mousewheel.handler;
    
    $(this).unbind('mousemove.mousewheel');
    
    if ( this.removeEventListener )
      this.removeEventListener( ($.browser.mozilla ? 'DOMMouseScroll' : 'mousewheel'), handler, false);
    else
      this.onmousewheel = function(){};
    
    $.removeData(this, 'mwcursorposdata');
  },
  
  handler: function(event) {
    var args = Array.prototype.slice.call( arguments, 1 );
    
    event = $.event.fix(event || window.event);
    // Get correct pageX, pageY, clientX and clientY for mozilla
    $.extend( event, $.data(this, 'mwcursorposdata') || {} );
    var delta = 0, returnValue = true;
    
    if ( event.wheelDelta ) delta = event.wheelDelta/120;
    if ( event.detail ) delta = -event.detail/3;
    if ( $.browser.opera ) delta = -event.wheelDelta;
    
    event.data = event.data || {};
    event.type = "mousewheel";
    
    // Add delta to the front of the arguments
    args.unshift(delta);
    // Add event to the front of the arguments
    args.unshift(event);
 
    return $.event.handle.apply(this, args);
  }
};
 
$.fn.extend({
  mousewheel: function(fn) {
    return fn ? this.bind("mousewheel", fn) : this.trigger("mousewheel");
  },
  
  unmousewheel: function(fn) {
    return this.unbind("mousewheel", fn);
  }
});
 
})(jQuery);

var timerid;
var banneritems;
var bannerwhole;
var currentbanner;
var transBanner;
var newsData;

$.getJSON("http://www2.lib.virginia.edu/announcements/index.php/tools/news-events-banners?callback=?",function(data)
             { newsData = data; });

$(document).ready(function(){

//Make Banner items from json
var banners = '<div class="content" style="overflow: hidden; position: relative;"><div id="banner-rotation" xmlns:content="http://purl.org/rss/1.0/modules/content/" style="position: relative; top: 0px;"></div></div>';
$('#banner').html(banners);

//object converter
function oc(a)
{
  var o = {};
  for(var i=0;i<a.length;i++)
  {
    o[a[i]]='';
  }
  return o;
}

var makeNews = function() 
      {
        if(newsData)
             {
                 //build News and Events
                 $("<ul></ul>").appendTo("#News .bd");

                 var events='';
                 $.each(newsData.items, function(ii, item) {
                         var feedcats = oc(item.categories);
                         //Make Banners
                         if(['Banner'] in feedcats) {  //only show image banners for now
                           var banneritem = $("<div></div>").attr('id', item.URLtitle); 
                           var image;
                           if(item.link)  
                             image = "<a href='"+item.link+"'><img src='"+item.bannerURL+"'/></a>";
                           else
                             image = "<img src='"+item.bannerURL+"'/>";
                           banneritem.html(image).appendTo("#banner-rotation");
                         }
                         //News & Events
                         if(['Event'] in feedcats && ['ShowHomepage'] in feedcats) {
                           var event = $("<li class='eventsListing'></li>");
                           if (item.startTime && item.endTime) {
                               startmonth = item.startTime.substring(5,8);
                               startday = item.startTime.substring(9,11);
                               startyear = item.startTime.substring(13,17);
                               endday = item.endTime.substring(9,11);
                               if (item.link) events +="<li class='eventsListing'><dl><dt><span class='eventDate'><span class='month-year'><span class='month'>"+startmonth+"</span><span class='dayRange'>"+startday+"-"+endday+"</span><span class='year'>"+startyear+"</span></span></span></dt><dd class='eventName'><span class='first'><a href='"+item.link+"'>"+item.title+"</a></span></dd></dl></li>";
                               else events +="<li class='eventsListing'><dl><dt><span class='eventDate'><span class='month-year'><span class='month'>"+startmonth+"</span><span class='dayRange'>"+startday+"-"+endday+"</span><span class='year'>"+startyear+"</span></span></span></dt><dd class='eventName'><span class='first'><a href='http://www2.lib.virginia.edu/librarynews.html#"+item.URLtitle+"'>"+item.title+"</a></span></dd></dl></li>";
                           } else if (item.startTime) {
                               month = item.startTime.substring(5,8);
                               day = item.startTime.substring(9,11);
                               year = item.startTime.substring(13,17);
                               if (item.link) events +="<li class='eventsListing'><dl><dt><span class='eventDate'><span class='month-year'><span class='month'>"+month+"</span><span class='dayRange'>"+day+"</span><span class='year'>"+year+"</span></span></span></dt><dd class='eventName'><span class='first'><a href='"+item.link+"'>"+item.title+"</a></span></dd></dl></li>";
                               else events +="<li class='eventsListing'><dl><dt><span class='eventDate'><span class='month-year'><span class='month'>"+month+"</span><span class='dayRange'>"+day+"</span><span class='year'>"+year+"</span></span></span></dt><dd class='eventName'><span class='first'><a href='http://www2.lib.virginia.edu/librarynews.html#"+item.URLtitle+"'>"+item.title+"</a></span></dd></dl></li>";
                           }
                         } 
                         if(['News'] in feedcats && ['ShowHomepage'] in feedcats) {
                           var event = $("<li></li>");
                           if (item.link) event.html("<a href='"+item.link+"'>"+item.title+"</a>");
                           else event.html("<a href='http://www2.lib.virginia.edu/librarynews.html#"+item.URLtitle+"'>"+item.title+"</a>");
                           event.appendTo("#News .bd ul");
                         }
                     }); 
                 if(events) $("#News .bd ul").append(events);

                 //Animate Banners
                 //Get Banner items
                 $('#banner .content').css({position: "relative", overflow: 'hidden'});

                 banneritems = $('#banner-rotation div');
                 bannerwhole = $('#banner-rotation');
                 bannerwhole.css({position: "relative"});
                 currentbanner=-1;

                 //function that randomly transisitions to a new random banner
                 transBanner = function(offset, speed) {
if (banneritems.length > 1) {
                   if (speed == null)
                     speed = 1500;
                   if (offset) {
                     //if the banner at offset exists, go to it
                     if ( currentbanner+offset < banneritems.length && currentbanner+offset >= 0) 
                       currentbanner=currentbanner+offset; 
                   } else {
                     //pick a random banner (that is not the current banner)
                     var randombanner=currentbanner; 
                     while(randombanner == currentbanner) {
                       randombanner = Math.floor( Math.random() * (banneritems.length) );
                     }
                     currentbanner=randombanner;
                   }
                   //get the chosen banners top value and animate to the inverse
                   bannerwhole.animate({top: banneritems.eq(currentbanner).position().top*(-1)}, speed);
}
                 } 

                 bannerwhole.mousewheel( function (event, delta) {
                   clearTimeout(timerid);
                   clearInterval(timerid); 
                   if(delta > 0)
                     transBanner(+1,100);
                   else
                     transBanner(-1,100);
                   timerid = setTimeout("timerid = setInterval(transBanner, 10000)",20000);
                   return false;
                 });

                 transBanner();
                 timerid = setInterval( transBanner, 10000); 
             }
       else {
         setTimeout(makeNews, 200);  
       }
    };
    makeNews();
});