var playlistURL;
var refreshPlaylist;
var refreshPlaylistInterval;
var text_width = $('#playlist').width();
var timer = [];

function scroll(id, direction) {
	var marginleft = $("#playlist #"+id).css('margin-left').match('-?[0-9]{1,}');
	var max_width = 290;
	var span_width = $("#playlist #"+id).width();
	if(direction=="left" && Math.abs(marginleft)+max_width >= span_width) {
		timer[id] = window.setTimeout("scroll('"+id+"', 'right')", 4000);
		return true;
	} else if(direction=="right" && marginleft>=0) {
		timer[id] = window.setTimeout("scroll('"+id+"', 'left')", 4000);
		return true;
	}
	$("#playlist #"+id).css('margin-left', marginleft-(direction=="left"?1:-1));
	timer[id] = window.setTimeout("scroll('"+id+"', '"+direction+"')", 100);
}
function need_scroll(id) {	
	if($("#playlist #"+id).width() > 290) {
		scroll(id, 'left');
	}
	return false;
}

function change_text(id, value, scroll) {
	$("#playlist #"+id).fadeOut();
	clearTimeout(timer[id]);
	$("#playlist #"+id).css('margin-left', '0px');
	$("#playlist #"+id).html(value);
	$("#playlist #"+id).fadeIn();
	if(scroll) {
		need_scroll(id);
	}
}

function xmlPlaylistLoaded(data, textStatus) 
{
	
	if($(data).find("song[position=now]").find("title").text()!=$("#playlist #title").html()) {
		
		$(data).find("song[position=now]").each(function() {
		
			var artist = $(this).find("artist").text();
			var album = $(this).find("album").text();
			var title = $(this).find("title").text();
		
			change_text('title', title, true);
			change_text('artist', artist, true);
			change_text('album', album, true);
			
			$("#playlist #info_button_url").attr('href', '/infos/'+artist+'/'+album+'.html');
			
			// iTunes
			var iTunesJSONurl = "http://ax.phobos.apple.com.edgesuite.net/WebObjects/MZStoreServices.woa/wa/wsSearch?term="+sanitize_for_url(artist)+"&media=music&entity=album&limit=1&callback=?";
			$.getJSON(iTunesJSONurl, updateBuyButton);
			
			// LastFM cover
			var LastFMJSONurl = "http://ws.audioscrobbler.com/2.0/?method=album.getinfo&api_key=dde10f27f642fac13c9557277f93c45f&artist="+artist+"&album="+album+"&format=json&callback=?";
			$.getJSON(LastFMJSONurl, updateCoverImage);
			
		});
		
		$(data).find("song[position=next]").each(function() {

			var next = $(this).find("artist").text()+" - "+$(this).find("title").text();
			change_text('next', '<span style="font-weight:bold">Next:</span> '+next);

		});

	}			
}

function sanitize_for_url(data)
{
	data = data.replace(new RegExp("[/ ]", "g"), "+");
	data = data.replace(new RegExp("[']", "g"), "");
	data = encodeURIComponent(data);
	return data;
}

function updateCoverImage(json, textStatus)
{
	if(json.error)
	{
		$("#playlist #cover").attr("src", "/images/iphone/nopicture.png");
	}
	else
	{
		$("#playlist #cover").attr("src", json.album.image[2]['#text']);
		//$("#banner #album_infos").html(json.album.wiki.summary);
	}
}

function updateBuyButton(json, textStatus)
{
	if(json.resultCount==0)
	{
		$("#playlist #buy_button_url").hide();
	}
	else
	{
		$("#playlist #buy_button_url").show().attr('href', 'http://clkuk.tradedoubler.com/click?p=23753&amp;a=1709937&amp;url='+json.results[0].artistViewUrl+'&amp;partnerId=2003');
	}
}

function refreshIcon(action)
{
	if(action=="show") { document.getElementById('refresh-icon').style.display = "inline"; }
	else if(action=="hide") { document.getElementById('refresh-icon').style.display = "none"; }
	else { document.getElementById('refresh-icon').style.display = "none"; }
}

function refreshPlaylist(playlistURL)
{
	//refreshIcon('show');
	$.ajax({
		type: "GET",
		url: playlistURL,
		success: xmlPlaylistLoaded,
		dataType: "xml",
		cache: false
	});
	refreshPlaylistInterval = setTimeout("refreshPlaylist('"+playlistURL+"')", 30000);
}

function stopTimer()
{
	clearTimeout(refreshPlaylistInterval);
}