// ==UserScript==
// @name           Favstar
// @namespace      https://gist.github.com/1129263
// @description    show favo count from favstar.fm 
// @include        http://twitter.com/*
// @include        https://twitter.com/*
// ==/UserScript==
(function () {

var IMG = "star";
var TEXT = "i";
var elemPool, starList, userName;

function init () {
	elemPool = [];
	starList = null;
	userName = getUserName();
	if (!userName) return;

	//Greasemonkey access violation: unsafeWindow cannot call GM_xmlhttpRequest.
	setTimeout(function () {
		GM_xmlhttpRequest({
			method: "get",
			url: "http://favstar.fm/users/" + userName + "/rss",
			onreadystatechange: function (req) {
				if (req.readyState === 4) {
					run(req);
				}
			}
		});
	}, 0);
};
init();

function run (req) {
	starList = {};
	var dom = (new DOMParser()).parseFromString(req.responseText, 'text/xml');
	Array.prototype.forEach.call( dom.querySelectorAll('item'), function (item) {
		var text = item.textContent;
		var count = (/\d+/.exec(text)||[])[0];
		var id = (/status\/(\d+)/.exec(text)||[,])[1];
		if (id && count) starList[id] = count;
	});
	elemPool.forEach(function (target) { putStar(target);});
};

function putStar (elem) {
	var id = elem.getAttribute('data-item-id');
	if (starList[id]) {
		var target = elem.getElementsByClassName('tweet-user-name')[0];
		if (0 < starList[id] && starList[id] < 6) {
			createStar(target, starList[id]);
		} else {
			createStar(target, 1);
			target.innerHTML += ["<", TEXT, ">x", starList[id], "</", TEXT, ">"].join('');
		}
	}
};

function createStar (target, count) {
	for (var i = 0; i < count; i++ ) {
		target.innerHTML += ["<", IMG,"></", IMG, ">"].join('');
	}
};

document.addEventListener("DOMNodeInserted", function (e) {
	var target = e.target;
	
	if (!target.className || target.className.indexOf('stream-item') === -1) return;
	
	if (userName !== getUserName()) {
		init(); //reload
	}
	
	starList ? putStar(target) : elemPool.push(target)
}, false);

function getUserName () {
	return (/^#!\/(\w+)/.exec(location.hash)||[,])[1];
};

(function () {
	var imgUrl = "http://a2.twimg.com/a/1314996488/phoenix/img/sprite-icons.png";
	var css = document.createElement('style');
	css.innerHTML = [".tweet-user-name ", IMG, "{",
		"background: transparent url(", imgUrl, ") no-repeat;",
		"background-position:-64px 0; display:inline-block; width:15px;height:15px; }",
		".tweet-user-name ", TEXT, "{ color: #aaa; }"].join('');
	document.head.appendChild(css);
})();

})();