/*
 * jQuery ctRotator Plugin
 * Examples and documentation at:http://thecodecentral.com/2008/11/12/ctrotator-a-flexible-itemimage-rotator-script-for-jquery
 * Under MIT license http://www.opensource.org/licenses/mit-license.php
 *
 * @author: Cuong Tham
 * @version: 1.0
 * @requires jQuery v1.2.6 or later
 *
 * @headsTip: Customizable rotating script for displaying large quantity of items in an interesting way
 */

(function($) {
$.fn.ctRotator = function(dataSource, options){
  options = $.extend({
     showCount: 5,
	 speed: 6000, //in milliseconds
	 fadeInSpeed: 750,
	 fadeOutSpeed: 250,
	 fadeEffect: true,
	 useTooltip: false,
	 shuffle: false,
	 itemRenderer: function(item){ 
	   if(item.url == null){
	     return '<li>' + item.title + '</li>'; 
	   }else{
	     return '<li><a href="' + item.url+ '">' + item.title + '</a></li>'; 
	   } 
	 },
	 tooltipOptions: {}
  }, options);
  
  if(options.showCount < 1){
    throw('options.showCount must be greater than 0');
  }
  
  return this.each(function(){
    $(this).empty();
    doRotating(dataSource, this, options);
  });
};

function doRotating(dataSource, container, options){
  var rotator = new ctRotatorList(dataSource, options.shuffle);
  var showCount = options.showCount;
  for(var i = 0; i < showCount; i++){
    insertItem(rotator.gotoNext(), container, options);
  }
  updateRotation(rotator, container, options);
}

function updateRotation(rotator, container, options){
  var item = rotator.gotoNext();
  var newLi = insertItem(item, container, options);
  
  if(options.fadeEffect){
    newLi.hide();
	var inSpeed = options.fadeInSpeed;
	var outSpeed = options.fadeOutSpeed;
	var rand_no = Math.random();
    options.speed = 5000 + (rand_no * 35000);
      $(container).children(':last').fadeOut(outSpeed, function(){
	    $(this).remove()
		newLi.fadeIn(inSpeed, function(){
	      setTimeout(function(){updateRotation(rotator, container, options)}, options.speed);newLi.css('display','');
        });
	  });
  }else{
    $(container).children(':last').remove();
	setTimeout(function(){updateRotation(rotator, container, options)}, options.speed);
  }
  
}

function insertItem(item, container, options){
   var rendered = options.itemRenderer(item);
   var newLi = $(rendered);
   if(newLi.size() == 0){
     newLi = $('<li></li>').append(rendered);
   }
   $(container).prepend(newLi);
   
   if(options.useTooltip){
     newLi.tooltip($.extend({
	   fade:50,
	   delay:800,
	   opacity: 1,
	   bodyHandler: function(){
	       return item.tip;
		 }
	 }, options.tooltipOptions));
   }
   
   return newLi;
}


function ctRotatorList(list, shuffle){
  this.cursor = 0;
  this.list = list;
  this.shuffle = shuffle == null ? false : shuffle;
  if(this.shuffle){
    this.list = this.shuffleArray(this.list);
  }
}

ctRotatorList.prototype = { 
  gotoNext:function(){
	  if(this.cursor >= this.getCount() - 1){ 
        this.cursor = 0;
	  }else{
	    this.cursor++;
	  }
      return this.list[this.cursor];
  },
  getCount:function(){
    return this.list.length;
  },
  shuffleArray:function(o){ //credit http://snippets.dzone.com/posts/show/849
    for(var j, x, i = o.length; i; j = parseInt(Math.random() * i), x = o[--i], o[i] = o[j], o[j] = x);
      return o;
  }
};

})(jQuery);