MusicBrainz.RatingsUpdater = function()
{

	this.initialise = function()
	{
		var entities_to_rate = getElementsByTagAndClassName("ul", "star-rating");
		for (var i = 0; i < entities_to_rate.length; i++) {
			var links = entities_to_rate[i].getElementsByTagName("a");
			for (var j = 0; j < links.length; j++) {
				connect(links[j], "onclick", this, this.rate);
			}
		}
	};
	
	this.rate = function(ev)
	{
		ev.stop();
		var link = ev.target();
		var t = link.id.split("::");
		var entitytype = t[1];
		var entityid = t[2];
		var selectedRating = t[3];

		// Determine if selectedRating equals the current user rating.
		// If it does, that means user want to unrate this entity
		var liCurrentRating = $("RATING::"+entitytype+"::"+entityid);
		var currentUserRating = (liCurrentRating.className == "current-user-rating") ? liCurrentRating.innerHTML : null;

		var rating = (selectedRating == currentUserRating) ? 0 : selectedRating;

		var url = "/bare/rate.html?entity_type=" + entitytype + "&entity_id=" + entityid 
				+ "&rating=" + rating + "&json=1";
		var d = loadJSONDoc(url);
		d.addCallback(bind(this.updateRatingStars, this, entitytype, entityid));
		//d.addErrback(bind(this.showError, this, entitytype, entityid));
		return false;
	}

	this.updateRatingStars = function(entitytype, entityid, newRatingInfo)
	{

		var rating = $("RATING::"+entitytype+"::"+entityid);
		// If user has canceled his rating, display community ratings
		if (newRatingInfo.user_rating == 0) {
			rating.className = "current-rating";
			rating.innerHTML = newRatingInfo.rating;
			rating.style.width = newRatingInfo.rating/5*100+'%';
		} 
		// Otherwise, display only his rating
		else {
			rating.className = "current-user-rating";
			rating.innerHTML = newRatingInfo.user_rating;
			rating.style.width = newRatingInfo.user_rating/5*100+'%';
		}
		
		// Update alt/title of rating links
		for (var i=1 ; i<=5 ; i++) {
			var rateLink = $("RATE::"+entitytype+"::"+entityid+"::"+i);
			var text = (i == newRatingInfo.user_rating) ? "Unrate this "+entitytype : "Rate this "+entitytype+": "+i;
			rateLink.alt = text;
			rateLink.title = text;
		}

		// Votes
		var totalVotes = $("VOTES-RATING::"+entitytype+"::"+entityid);
		if (totalVotes) {
			totalVotes.innerHTML = (newRatingInfo.rating_count ? newRatingInfo.rating_count : 0)
				+ " time" + (newRatingInfo.rating_count == 1 ? "" : "s");
		}

		// Average rating
		var communityRating = $("COMMUNITY-RATING::"+entitytype+"::"+entityid);
		if (communityRating) {
			var rt = Math.round(newRatingInfo.rating*100)/100;
			communityRating.innerHTML = (rt == 0) ? "none" : rt;
		}
	}

	this.showError = function(entitytype, entityid)
	{
		/*
		var tagthis =
			A({"id": "tagthis", "class": entitytype+"::"+entityid, "href": "/show/"+entitytype+"/tags.html?id="+entityid+"&showform=1"},
				"Tag this "+entitytype);
		replaceChildNodes("tagform", P({}, tagthis), DIV({"class": "ajaxSelectLoading"}, "Error while loading the tag list."));
		connect(tagthis, "onclick", this, this.loadForm);
		*/
	}

};

var ratingseditor = new MusicBrainz.RatingsUpdater();
mb.registerPageLoadedAction(new MbEventAction("ratingseditor", "initialise", "Init ratings editor"));