// YouTube playlist for the INSTRUCTIONAL MEDIA page
jQuery.fn.ytplaylist = function(options) {
 
	// default settings
	var options = jQuery.extend( 
	{
		holderId: 'ytvideo',
		playerHeight: '475',
		playerWidth: '588',
		addThumbs: false,
		thumbSize: 'small',
		showInline: false,
		autoPlay: true,
		showRelated: true,
		allowFullScreen: false
	},options);
 
 	return this.each(function() 
  	{
		var selector = $(this);		
		var autoPlay = "";
		var showRelated = "&rel=0";
		var fullScreen = "";
		
		if(options.autoPlay) autoPlay = "&autoplay=1"; 
		if(options.showRelated) showRelated = "&rel=1"; 
		if(options.allowFullScreen) fullScreen = "&fs=1"; 
		
		//throw a youtube player in
		function play(id)
		{
			var html  = '';
			
			html += '<object height="'+options.playerHeight+'" width="'+options.playerWidth+'">';
			html += '<param name="movie" value="http://www.youtube.com/v/'+id+autoPlay+showRelated+fullScreen+'"> </param>';
			html += '<param name="wmode" value="transparent"> </param>';
			if(options.allowFullScreen) 
			{ 
					html += '<param name="allowfullscreen" value="true"> </param>'; 
			}
			html += '<embed src="http://www.youtube.com/v/'+id+autoPlay+showRelated+fullScreen+'"';
			if(options.allowFullScreen) 
				{ 
					html += ' allowfullscreen="true" '; 
				}
			html += 'type="application/x-shockwave-flash" wmode="transparent"  height="'+options.playerHeight+'" width="'+options.playerWidth+'"></embed>';
			html += '</object>';
			
			return html;
		};
		
		
		//grab a youtube id from a (clean, no querystring) url 
		// (thanks to http://jquery-howto.blogspot.com/2009/05/jyoutube-jquery-youtube-thumbnail.html)
		function youtubeid(url) 
		{
			var ytid = url.match("[\\?&]v=([^&#]*)");
			ytid = ytid[1];
			return ytid;
		};
		
		
		//load inital video
		var firstVid = selector.children("li:first-child").addClass("currentvideo").children("a").attr("href");
		$("#"+options.holderId+"").html(play(youtubeid(firstVid)));
		
		//load video on request
		selector.children("li").children("a").click(function() {
			if(options.showInline) 
			{
				$("li.currentvideo").removeClass("currentvideo");
				$(this).parent("li").addClass("currentvideo").html(play(youtubeid($(this).attr("href"))));
			}
			else 
			{
				$("#"+options.holderId+"").html(play(youtubeid($(this).attr("href"))));
				$(this).parent().parent("ul").find("li.currentvideo").removeClass("currentvideo");
				$(this).parent("li").addClass("currentvideo");
			}
			return false;
		});
		
		//do we want thumns with that?
		if(options.addThumbs) 
		{
			selector.children().each(function(i)
			{
				var replacedText = $(this).text();
				
				if(options.thumbSize == 'small') 
				{
					var thumbUrl = "http://img.youtube.com/vi/"+youtubeid($(this).children("a").attr("href"))+"/2.jpg";
				}
				else 
				{
					var thumbUrl = "http://img.youtube.com/vi/"+youtubeid($(this).children("a").attr("href"))+"/0.jpg";
				}
				
				$(this).children("a").empty().html("<img src='"+thumbUrl+"' alt='"+replacedText+"' />"+replacedText).attr("title", replacedText);
			});	
		}
  
	});
	 
};  // end ytplaylist