/**
 * Utility functions:
 * addListener, removeListener, onDomReady, stopEvent
 * http_build_query, GET, POST, json_decode
 * getOffset, String.trim, plural_ru, htmlspecialchars, unmg
 *
 * Version: 2015-07-23
 */

// Cross-browser add/remove event listeners
window.addListener = (function() {
	return window.addEventListener
		? function(el, type, fn) { el.addEventListener(type, fn, false); }
		: function(el, type, fn) { el.attachEvent('on'+type, fn); };
})();

window.removeListener = (function() {
	return window.removeEventListener
		? function(el, type, fn) { el.removeEventListener(type, fn, false); }
		: function(el, type, fn) { el.detachEvent('on'+type, fn); };
})();

// Cancel event bubbling and/or default action
window.stopEvent = function(ev, cancelBubble, preventDefault)
{
	if (cancelBubble)
	{
		if (ev.stopPropagation)
			ev.stopPropagation();
		else
			ev.cancelBubble = true;
	}
	if (preventDefault && ev.preventDefault)
		ev.preventDefault();
	ev.returnValue = !preventDefault;
	return !preventDefault;
};

// Remove leading and trailing whitespace
if (!String.prototype.trim)
{
	String.prototype.trim = function()
	{
		return this.replace(/^\s\s*/, '').replace(/\s\s*$/, '');
	};
}

window.onDomReady = (function()
{
	var readyBound = false;
	var bindReady = function()
	{
		if (readyBound)
			return;
		readyBound = true;
		if (document.addEventListener)
		{
			document.addEventListener("DOMContentLoaded", function()
			{
				document.removeEventListener("DOMContentLoaded", arguments.callee, false);
				ready();
			}, false);
		}
		else if (document.attachEvent)
		{
			document.attachEvent("onreadystatechange", function()
			{
				if (document.readyState === "complete")
				{
					document.detachEvent( "onreadystatechange", arguments.callee );
					ready();
				}
			});
			if (document.documentElement.doScroll && window == window.top)
			{
				(function()
				{
					if (isReady)
						return;
					try
					{
						document.documentElement.doScroll("left");
					}
					catch(error)
					{
						setTimeout(arguments.callee, 0);
						return;
					}
					ready();
				})();
			}
		}
		if (window.addEventListener)
			window.addEventListener('load', ready, false);
		else if (window.attachEvent)
			window.attachEvent('onload', ready);
		else
			window.onload = ready;
	};
	var isReady = false;
	var readyList = [];
	var ready = function()
	{
		if (!isReady)
		{
			isReady = true;
			if (readyList)
			{
				var fn_temp = null;
				while (fn_temp = readyList.shift())
					fn_temp.call(document);
				readyList = null;
			}
		}
	};
	return function(fn) {
		bindReady();
		if (isReady)
			fn.call(document);
		else
			readyList.push(fn);
		return this;
	};
})();

(function() {
var createRequestObject = function()
{
	if (typeof XMLHttpRequest === 'undefined')
	{
		XMLHttpRequest = function() {
			try { return new ActiveXObject("Msxml2.XMLHTTP"); }
			catch(e) {}
			try { return new ActiveXObject("Microsoft.XMLHTTP"); }
			catch(e) {}
			throw new Error("This browser does not support XMLHttpRequest.");
		};
	}
	return new XMLHttpRequest();
};
var setCallback = function(r, cb)
{
	r.onreadystatechange = function()
	{
		if (r.readyState == 4)
		{
			var d;
			if (r.getResponseHeader('Content-Type').indexOf('/json') > 0)
			{
				d = json_decode(r.responseText);
			}
			cb(r, d);
		}
	};
};
window.http_build_query = function(data)
{
	var encoded = '';
	for (var i in data)
	{
		encoded = encoded+'&'+encodeURIComponent(i)+'='+(data[i] === false || data[i] === null ? '' : encodeURIComponent(data[i]));
	}
	return encoded.substr(1);
};
window.GET = function(url, data, cb)
{
	var r = createRequestObject();
	url = url + (url.indexOf('?') >= 0 ? '&' : '?') + http_build_query(data);
	r.open('GET', url);
	setCallback(r, cb);
	r.send();
};
window.POST = function(url, data, cb)
{
	var r = createRequestObject();
	r.open('POST', url);
	setCallback(r, cb);
	if (!window.FormData || !(data instanceof FormData))
	{
		r.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
		data = http_build_query(data);
	}
	r.send(data);
};

// Get element position using getBoundingClientRect()
var getOffsetRect = function(elem)
{
	var box = elem.getBoundingClientRect();

	var body = document.body;
	var docElem = document.documentElement;

	var scrollTop = window.pageYOffset || docElem.scrollTop || body.scrollTop;
	var scrollLeft = window.pageXOffset || docElem.scrollLeft || body.scrollLeft;
	var clientTop = docElem.clientTop || body.clientTop || 0;
	var clientLeft = docElem.clientLeft || body.clientLeft || 0;
	var top = box.top + scrollTop - clientTop;
	var left = box.left + scrollLeft - clientLeft;

	return { top: Math.round(top), left: Math.round(left) };
};

// Get element position using sum of offsetTop/offsetLeft
var getOffsetSum = function(elem)
{
	var top = 0, left = 0;
	while(elem)
	{
		top = top + parseInt(elem.offsetTop);
		left = left + parseInt(elem.offsetLeft);
		elem = elem.offsetParent;
	}
	return { top: top, left: left };
};

// Get element position, relative to the top-left corner of page
window.getOffset = function(elem)
{
	if (elem.getBoundingClientRect)
		return getOffsetRect(elem);
	else
		return getOffsetSum(elem);
};

})();

window.json_decode = function(text)
{
	if (!text)
	{
		return null;
	}
	try
	{
		if (JSON)
		{
			return JSON.parse(text);
		}
		return eval(text);
	}
	catch(e)
	{
		if (window.console)
		{
			console.log(e);
		}
	}
	return null;
};

window.plural_ru = function(count, one, few, many)
{
	var sto = count % 100;
	if (sto >= 10 && sto <= 20)
		return many;
	switch (count % 10)
	{
		case 1: return one;
		case 2:
		case 3:
		case 4: return few;
	}
	return many;
};

window.htmlspecialchars = function(text)
{
	return text.replace(/&/g, '&amp;')
		.replace(/'/g, '&apos;') // '
		.replace(/"/g, '&quot;') // "
		.replace(/</g, '&lt;')
		.replace(/>/g, '&gt;');
};

window.unmg = function(id, str)
{
	str = decodeURIComponent(str.replace(/([\x20-\x24\x26-\x79])|(%..)/g, function(m, m1, m2) { return m2 || ('%'+(159-m1.charCodeAt(0)).toString(16)); }));
	document.getElementById(id).innerHTML = '<a href="ma'+'ilt'+'o:'+str+'">'+str+'</a>';
};