// ==UserScript==
// @name            last.fm - radio lyrics
// @namespace       http://www.reeloo.net
// @description     lyrics for last.fm radio (lyricwiki.org database)
// @include         http://www.last.fm/listen*
// @include         http://www.lastfm*/listen*
// @version         0.3
// @author          reeloo
// ==/UserScript==

//HISTORY
//
//
//	version 0.4 (20090804)
//		lyricsfly.com permanent API key obtained - fully functional again
//
//
//	version 0.3 (20090803) - temporary
//		on 3. July, lyricwiki.org discontinued offering their API service
//		migration to lyricsfly.com demo API (waiting for permanent API key)
//
//
//	version 0.2-
//		undocumented history
//


function foo(){
    // construction of wrapper for lyrics
    if (document.getElementById("userMetadata") && document.getElementById("recentTracks")) {
		if (!document.getElementById("greasemonkey_lyrics")) {
			sidebar = document.getElementById("userMetadata");
			sidebar.innerHTML = lyrics_wrapper + sidebar.innerHTML;
			
			//destroys rounded corners in top of sidebar (if recentTracks is in the top)
			recentTracks = document.getElementById("recentTracks");
			recentTracksClass = recentTracks.getAttribute("class");		
			recentTracksClass = recentTracksClass.replace("firstItems", "");
			recentTracks.setAttribute("class", recentTracksClass);
		}

		else {
			// db queries are expensive
			if (document.title != document_title_old){
				data = document.title.split(" - ");

				// only one safe method: "artist - title - Last.fm"
				if (data.length == 3){
					artist = data[0];
					title = data[1];

					//Greasemonkey's XMLHttp Request
					GM_xmlhttpRequest({
						method: "GET",
						url: "http://lyricsfly.com/api/api.php?i=55562032656-reeloo.net/wordpress/lyrics-for-lastfm-radio"
							+ "&a=" + encodeURIComponent(artist.replace(/[^a-z0-9]/ig, "%"))
							+ "&t=" + encodeURIComponent(title.replace(/[^a-z0-9]/ig, "%")),

						headers: {"User-agent": "Mozilla/4.0 (compatible) Greasemonkey",
								  "Accept": "application/xml"},

						onload: function(response) {
								var responseDoc = new DOMParser().parseFromString(response.responseText, "text/xml");
								responseDoc.normalize();
								
								if (responseDoc.getElementsByTagName("tx").length > 0){
									var lyrics = responseDoc.getElementsByTagName("tx")[0].textContent;
									var sourceURL = "http://lyricsfly.com/search/correction.php?" + responseDoc.getElementsByTagName("cs")[0].textContent + "&id=" + responseDoc.getElementsByTagName("id")[0].textContent;
								}
								else{
									var lyrics = "...";
									var sourceURL = "http://lyricsfly.com/submit/";
								}
								
								lyrics_text = document.getElementById("greasemonkey_lyrics_text");
								lyrics_text.innerHTML = '<strong>' + artist +' - ' + title + '</strong><br /><br />'

												+ lyrics.replace(/\[br\]/g, "<br />")
												+ '<br/><span class="moduleOptions" style="padding-right: 0;">'
												+ '<a href="' + sourceURL + '" style="background-image: url(\'\'); padding-right: 0;">'
												+ '<img width="19" height="19" src="http://cdn.last.fm/flatness/icons/pencil.gif" class="edit_icon transparent_png" />'
												+ '<span>Edit</span></a></span>';
								}
					});
				}

				// page loading or undistinguishable document.title
				else{
					lyrics_text = document.getElementById("greasemonkey_lyrics_text");
					lyrics_text.innerHTML = "...";
				}

				// for process of "have we seen this before?"
				document_title_old = document.title;
			}
		}
	}
}





// wrapper for lyrics
lyrics_wrapper=''+
			'<div class="items firstItems" id="greasemonkey_lyrics">'+
			'	<h2 class="heading">'+
			'		<span class="h2Wrapper">Lyrics</span>'+
			'	</h2>'+
			'	<div id="greasemonkey_lyrics_text" class="itemContent" style="padding: 0.5em 1.2em 0.5em 1.2em;">'+
			'	</div>'+
			'</div>'+
			'';





// initialization
document_title_old = document.title;
setInterval(foo, 1000);