jQuery.fn.youtube = function(data)
{
    var config = {
                  type              : null,          // allowed values: 'playlist', 'search','user'
		              keyword           : null,          //A search query term. Searches for the specified string in all video metadata, such as titles, tags, and descriptions.
		              url               : null,
                  user              : null,          // videos uploaded by a user
		              alt               : null,          //The format of feed to return, such as atom (the default), rss, or json.
                  order_by          : null,          //The order in which to list entries, such as relevance (the default for the videos feed) or viewCount.
                  start_index       : null,          //The 1-based index of the first result to be retrieved (for paging). 
	                max_results       : 10,          //The maximum number of entries to return at one time
	                categories        : null,          //The categories and/or tags to use in filtering the feed results. 
		                                             //  For example, feedURL/-/fritz/laurie returns all entries 
									                 // that are tagged with both of the user-defined tags fritz and laurie.
		
                  format            : null,          //A specific video format. For example, format=1 restricts search results to videos for mobile devices.		
		              most_viewed       : null,
		              top_rated         : null,
		              recently_featured : null,
		              top_favorites     : null,
		              most_discussed    : null,
		              most_linked       : null,
		              most_responded    : null,
		   
		              recently_featured : null,
		              playlist_id       : null,          //playlists feed contains a list of public playlists defined by a user.
		              div               : this,
		              
		              cleanReturn       : 1,             //do you want a full youtube return, or just an image list
		              callback          : null,
                  api_key           : null
	            };//end of config
		 
		if(data) 
		{
		   $.extend(config, data);
		}
		
		return this.each(function()
      {
      	$('#youtubelist').remove();
      	$(this).append('<ul id="#youtubelist">');

      	var url = $.youtube.getURL(config);
      	$.youtube.request(url);
      }
    );
    
}
/*end of youtube function*/
    
	
/** 
 *extend the youtube function

 */

$.youtube = 
{
	config   :{},
	
	/**
	  * genereate the url 
	  * according to the configuration
	  *
	  *
	  
	  */
	
	getURL: function(config)
	{
	  var url='';
		this.config = config;
		config.type = config.type;
		
		if( (config.type =='search') || (config.type=='tag') || (config.type=='title') || (config.type =='description') )
		{
		    config.type='search';
		}
			
        if (config.url) return config.url;
        if (!config.callback) config.callback = 'jQuery.youtube.response';
		
		var url = 'http://gdata.youtube.com/feeds/';
		
		switch (config.type){
			case 'users':    url +='users/'+config.keyword+'/uploads?alt=json-in-script&callback='+config.callback;
			                 break;
			    
      case 'search':   url  +='videos?alt=json-in-script&callback='+config.callback;
				             url  += '&vq='+config.keyword;   
				             if(config.user){
				               url  += '&author='+ config.user;
				             }
			                 break;
			              
			case 'playlist': url +='playlists/'+config.keyword;
			                 break;
			                 
			case 'category': break;
			                 
            default        : url ='http://gdata.youtube.com/feeds/videos';
				
        }
        
		if (config.start_index) 
		{
		   url +='&start-index='+ config.start_index;
		}
		
			if (config.order_by){
  		  url +='&orderby='+ config.order_by;
  		}
		
		
		if (config.max_results) 
		{
		    url +='&max-results='+ config.max_results;
		}
    // if(typeof(console)){
    //   console.log(url);
    //    }
	   return url;
	},
	
	/* 
	*request the url in the head and get the jsondata
	*@param url string
	*@return null,
	*/
	request: function(url)
	{
		var script  = document.createElement('script');
        script.type = 'text/javascript';
        script.src  = url;
        
        document.documentElement.firstChild.appendChild(script);
    },
	
	/**
	* this function process the jsondata
	* and display into the div 
	*
	*@param jsonData jsondata
	*/
	response : function (jsonData){

        if(jsonData.feed.entry){
	         var html='';
		     $.each( jsonData.feed.entry, function(i, item) { 
            for( var k = 0; k <item.link.length; k++ ){
               if( item.link[k].rel == 'alternate' ){
      	          url = item.link[k].href;
       	          break;
                }
            };
          
            var thumb = item.media$group.media$thumbnail[1].url;
            var videoId  = $.youtube.getVideoId(url);
            html        += '<a href="/video/'+videoId+'"><img id="'+videoId+'" src="'+thumb+'"  class="youtubethumb" alt="'+item.title.$t+'"></a>';
         });
		     $(this.config.div).html(html);
	    } 	  
	},
	
    /** 
     * @param url 
     * @return video id   
     */	
	getVideoId: function (url)
	{
	   var arrayURL= url.split("=");
	   if (arrayURL)
	    {
		   return arrayURL[1];
		}
	}
    	  
};