/**
 * 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);
             $("#shuffleBannar img:first").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();
                            $("#shuffleBannar").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);