/**

 * jQuery Shuffle Bannar plugin

 * Copyright (C) cubdesign | http://www.cubdesign.com/

 * Dual licensed under the MIT <http://www.opensource.org/licenses/mit-license.php>

 * and GPL <http://www.opensource.org/licenses/gpl-license.php> licenses.

 * Date: 2010-02-26

 * @author Takeo Tamura

 * @version 0.5.0

 */



(function($) {

    var name_space = 'shuffleBannar';

    $.fn[name_space] = function(options) {

        var elements = this;

        var settings = $.extend({

            'bannarList' : [],

			'interval':5000,

			'fadeOutTime' : 1000,

			'fadeInTime' : 1000

        }, options);



		

		var addData = function (v) {

            $.data(v, name_space, {});

            return $(v);

        };





		/*

		* シャッフルする

		*/

		var shuffle = function (targetArray)  {

			var i  = targetArray.length;

			 while (i) {

				var j  = Math.floor(Math.random() * i);

				var x  = targetArray[--i];

				targetArray[i] = targetArray[j];

				targetArray[j] = x; 

			 }

			return targetArray; 

		};

	

		//キャッシュ防止用

		var nocache = new Date().getTime();

		

		

		var bannarList = settings.bannarList;

		//シャッフル

		bannarList = shuffle(settings.bannarList);

		

		//今表示しているバナーの番号

		var currentBannarNumber = -1;

		

		//インターバルID

		var iId = -1;



		/*

		* バナーを変更する

		*/

		var changeBannarImage = function ()  {

			clearInterval(iId);

			 $("img:first",elements).fadeOut(settings.fadeOutTime,function(){

				$(this).remove();

				loadBannarImage();

			 });

		

		};

		/*

		* バナーを読み込む

		*/

		var loadBannarImage = function ()  {

			currentBannarNumber++;

			

			if( currentBannarNumber == bannarList.length ){

				currentBannarNumber = 0;

			}

			

			var targetBannar = bannarList[ currentBannarNumber ];

			

			

			

			var imageURL = "" + targetBannar.image + "?nocache="+nocache;

			var linkURL = "" + targetBannar.link;

		

			var img = new Image();

		

			 $(img).load(function(){

							$(this).hide();

							$(elements).append(this);

							$(this).fadeIn(settings.fadeInTime);

							$(this).click(function(){location.href=linkURL;});

							iId = setInterval(changeBannarImage,settings.interval)

						}).attr('src', imageURL)

	

		};



        elements.each(function() {

			addData( this );

			loadBannarImage();

        });



        //method chain

        return this;

    };

})(jQuery);