ghostly.js

/*
 * Chrome-Last.fm-Scrobbler Ghostly Discovery Connector by Peter McEvoy
 * 2011-08-28
 */

var track, artist, album, duration
var scrobbleTimeout = null;
var durationTimeout = null;



$(function(){
	
	//setup unload handler
	$(window).unload(function() {      
		// reset the background scrobbler song data
		chrome.extension.sendRequest({type: 'reset'});
		return true;      
	});
	
	
	//Start when user has picked a mood to listen to.
	$("div#submit input").click(function(){
		//Listen for change in result div
		var c = 0;
		$('div#result').bind('DOMNodeInserted', function(e) {
			
			//HTML changed, NEW SONG!!!	
			//The jquery dom bind gets triggerd two times, this is to avoid the code from being executed twice.	
			if (c == 0) {c++; return false;}
			// cancel any previous timeout
			if (scrobbleTimeout != null)clearTimeout(scrobbleTimeout);
			if (durationTimeout != null)clearTimeout(durationTimeout);
			
			displayMsg()
			
			//set vars
			artist = $("dd.artist").text();
			track = $("dd.track").text();
			album = $("dd.album").text();
			
			//Song duration on page updates as the music gets loaded by the browser. Might take a while before you get a fixed duration for the track. waitForDuration checks if the track duration has not changed in a while (the track should then be fully loaded)
			waitForDuration(updateNowPlaying);
			
			c=0;
		})		
	})
});



function updateNowPlaying() {
	if (artist == '' || track == '' || duration == 0) {return;}
	//validate track info
	chrome.extension.sendRequest({type: 'validate', artist: artist, track: track}, function(response) {
		if (response != false){
			
			chrome.extension.sendRequest({type: 'nowPlaying', artist: artist, track: track, duration: duration});
			
			console.log({type: 'nowPlaying', artist: artist, track: track, duration: duration});
			
			displayMsg("Scrobbling");

		}
		
	});
}



function waitForDuration(callback) {
	
	function getDuration() {
		var duration_el = $("li#info_position").text();
		if (duration_el == "loading..." || duration_el == "0:00")return false;
		var total_length = duration_el.split(" / ")[1];
		return parseInt(total_length.split(":")[0]*60)+parseInt(total_length.split(":")[1]);	// turn something like 5:50 into seconds
	}
	
	var check_1 = getDuration();
	
	durationTimeout = setTimeout(function(){
		
									var check_2 = getDuration();
									if (check_1 == check_2 && check_1 != false && check_1 != 0 ){
										//not loading anymore
										duration = check_1;
										callback();
									}
									else {
										waitForDuration(callback);
									}
	}, 1000);
	
	
}

function displayMsg(msg) {
	
	$('#chrome-scrobbler-status').remove(); 
	 
	if (msg) {              
		$('#playButton').append('<span id="chrome-scrobbler-status" title="">'+msg+'</span>');
	}
	
}