//5k
function InboxCounters(url)
{
	// request url
	this.url = url || 'http://export.yandex.ru/counters-js.xml';

	// true if success operation
	this.success = false;

	// id for timer
	this.load_id = null;

	this.window = window;
	var agt = navigator.userAgent.toLowerCase();

	this.isDOM = document.getElementById; //DOM1 browser
	this.isO   = this.window.opera && this.isDOM; //Opera 5+
	this.isIE  = document.all && document.all.item && !this.isO; //Microsoft Internet Explorer 4+
	this.isIE5 = this.isIE && this.isDOM; //MSIE 5+
	this.isGecko = ((agt.indexOf('gecko') != -1) && (agt.indexOf('khtml') == -1));

	this.right_browser = this.isGecko || this.isIE5;

	var self = this;

	this.window.onLoadInbox = function()
	{
		self.onLoad(self);
	};

	this.window.getDataInbox = function()
	{
		self.getData(self);
	};
}

InboxCounters.prototype =
{
	refresh: 5, timeout: 50000, charset: 'windows-1251',

	onTimeout: function()
	{
		if (this.load_id && !this.success) {
			this.window.clearTimeout(this.load_id);
		}
	},

	getById: function(id)
	{
		if (this.isDOM) {
			return document.getElementById(id);
		} else if (document.all) {
			return document.all[id];
		}
		return null;
	},

	getCookie: function(n)
	{
		var c = document.cookie;
		if (c.length < 1) return false;

		var b = c.indexOf(n + '=');
		if (b == -1) return false;

		b += (n.length + 1);
		var e = c.indexOf(';', b);

		return unescape((e == -1) ? c.substring(b) : c.substring(b, e));
	},

	checkSession: function()
	{
		var sid = this.getCookie('Session_id');
		if (!sid) return false;
		var parts = sid.split('.');
		if (parts[2] == '1') return true;
		var now = new Date().getTime();
		if (parts[2] == '3') return parseFloat((now - parts[0] * 1000 - parts[1]) / 1000) < 1209600.0;
		return parseFloat((now - parts[0] * 1000 - parts[1]) / 1000) < 7200.0;
	},

	isDeadSession: function()
	{
		return !this.checkSession();
	},

	isLogin: function()
	{
		if (this.isDeadSession()) {
			return false;
		}
		var login = this.getCookie('yandex_login');
		return (login && login.length > 1);
	},

	killTimerIfNeed: function()
	{
		if (this.load_id != null) {
			this.window.clearTimeout(this.load_id);
			this.load_id = null;
		}
	},

	onLoad: function(self)
	{
		self.killTimerIfNeed();

		var header = self.getById('inbox_logout');

		//this.window.status = typeof(inboxCounters);
		if (typeof(self.window.inboxCounters) != 'undefined' && !self.success && header) {
			self.draw(self.window.inboxCounters);
		} else {
			self.load_id = self.window.setTimeout('onLoadInbox()', self.refresh);
		}
	},

	// draw counters
	draw: function(counters)
	{
		var item, name, count, icon, suffix, counter, services = counters.services;

		function clck(a, w)
		{
			new Image().src = 'http://clck.yandex.ru/click/dtype=stred/pid=1/cid=' + w + '/*' + a.href;
		}

		for (name in services) {
			// skip counters data (Bar BUG)
			if (name.indexOf('_counter') != -1) {
				continue;
			}

			item	= services[name];
			count	= item.count;
			icon	= item.icon;
			suffix	= item.suffix;
			counter = item.counter || services[name + '_counter'];

			var id = 'inbox_counter_' + name;
			var container = this.getById(id);

			if (icon && (document.location.protocol && document.location.protocol == 'https:')) {
				icon = icon.replace('http://', 'https://');
			}

			if (container) {
				var icon_content = (icon ? '&#160;<img src="' + icon + '" alt=""\/>' : '');
				var suffix_content = (suffix ? '&#160;' + suffix : '');
				var count_content = ('&#160;' + count + suffix_content);

				container.innerHTML = (count > 0 || (count >= 0 && suffix) ? icon_content + count_content : '');

				if (counter) {
					var link = container;
					while ((link = link.previousSibling)) {
						if (link.tagName && link.tagName.toLowerCase() == 'a') {
							link.onclick = function(c) {
								return function() { clck(this, c); };
							}(counter);
							break;
						}
					}
				}
			}
		}

		if (this.callback && typeof(this.callback) == 'function') {
			this.callback(this, counters);
		}

		this.success = true;
	},

	// create data node
	getData: function(self)
	{
		var node = self.getById('inbox_data');

		if (node) {
			var data = document.createElement('script');
			data.setAttribute('type', 'text/javascript');
			data.setAttribute('charset', self.charset);
			data.setAttribute('src', self.url);
			data.setAttribute('onload', 'inbox.onLoad(inbox)');
			node.appendChild(data);
		}
	},

	// process counters
	process: function()
	{
		// check if user log in
		if (!this.isLogin()) return;

		// check if old browser
		if (!this.right_browser) return;

		this.window.setTimeout('getDataInbox()', 0);

		this.load_id = this.window.setTimeout('onLoadInbox()', this.refresh);

		if (this.onTimeout && this.timeout > 0) {
			this.window.setTimeout(this.onTimeout, this.timeout);
		}
	},

	// load data for old browsers (insert on end of page)
	load: function()
	{
		// check if is new browser
		if (this.right_browser) return;

		// check if user log in
		if (!this.isLogin()) return;

		// call inbox data
		document.writeln('<script id="inbox_data_script" type="text\/javascript" charset="' + this.charset + '" src="' + this.url + '"><\/script>');

		// save onload func
		var onload = null;
		if (this.window.onload) {
			onload = this.window.onload;
		}

		var self = this;
		this.window.onload = function(e)
		{
			self.onLoad(self);

			// call saved onload func
			if (onload) {
				onload(e);
			}
		};

		if (this.onTimeout && this.timeout > 0) {
			this.window.setTimeout(this.onTimeout, this.timeout);
		}
	}
};