var webPrefix = window.location.hostname == '10.6.1.71' ? 'http://10.6.1.71' : 'http://testblock.ruvr.ru';
var debug = 0;
var constHeight = 87;
var constTitleHeight = 20;

/* Gets the query string for this script tag */
function getQueryString(scriptTag) {
	var queryString = scriptTag.src.replace(/^[^\?]+\??/,'');
	return queryString;
}

/* Parses Query String and returns value for given argument */
function getQueryStringArg(queryString, key, defaultValue){
	if (defaultValue == null) {
		defaultValue = ""; 
	}
	key = key.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
	var regex = new RegExp("[\\?&]?"+key+"=([^&#]*)");
	var qs = regex.exec(queryString);
	if (qs == null) {
		return defaultValue;
	} else {
		return qs[1];
	}
}

function getScriptTag() {
	var scripts = document.getElementsByTagName('script');
	var index = scripts.length - 1;
	var myScript = scripts[index];
	return myScript;
}

if (this.myScript == undefined) {
	this.myScript = [];
}
this.myScript.push(getScriptTag());

/* отправляет аяксовым запрос, заполняет innerHTML элемента */
function fillElementWithXmlHttpGet(strURL, el) {
    var xmlHttpReq = false;
    var self = this;
    try {
		// Opera 8.0+, Firefox, Safari
    	self.xmlHttpReq = new XMLHttpRequest();
	} catch (e){
		// Internet Explorer Browsers
		try {
			self.xmlHttpReq = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try {
				self.xmlHttpReq = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e) {
				// Something went wrong
				return false;
			}
		}
	}
	self.xmlHttpReq.onreadystatechange = function() {
        if (self.xmlHttpReq.readyState == 4) {
        	el.innerHTML = self.xmlHttpReq.responseText;
        }
    };
    self.xmlHttpReq.open('GET', strURL, true);
    self.xmlHttpReq.send(null);
}

//Create the iFrame. Must do attributes before page drop. IE doesn't like it done after
function getiFrame(pBannerPlaceId, pWidth, pHeight, pMin, pCount){
	var ifrm = document.createElement('iframe');
	ifrm.setAttribute('width', pWidth+'px');
	if (pHeight != -1) {
		ifrm.setAttribute('height', pHeight+'px');
	}
	ifrm.setAttribute('frameBorder', '0');
	ifrm.setAttribute('scrolling', 'no');
	var src_str = webPrefix + '/iframe?bp=' + pBannerPlaceId + '&ref=' + document.location.href +'&cache=' + Math.random();
	if (pWidth) src_str = src_str + '&w=' + pWidth;
	if (pHeight != -1) src_str = src_str + '&h=' + pHeight;
	if (pMin) src_str = src_str + '&min=' + pMin;
	if (pCount) src_str = src_str + '&num=' + pCount;

	ifrm.setAttribute('src', src_str);
	try {
		if (pWidth) ifrm.style.width = pWidth + 'px';
		if (pHeight != -1) ifrm.style.height = pHeight+'px';
		ifrm.style.overflow = 'hidden';
		ifrm.style.border = '0px';
	} catch(e) {}
	return ifrm;
}

//Create the div
function getDiv(pWidth, pHeight) {
	var div = document.createElement('div');
	div.setAttribute('style', 'width:' + pWidth + 'px; height:' + pHeight + 'px;');
	div.setAttribute('class', 'ruvrbanner;');
	return div;
}

function addEvent(elem, evType, fn) {
	if (elem.addEventListener) {
		elem.addEventListener(evType, fn, false);
	}
	else if (elem.attachEvent) {
		elem.attachEvent('on' + evType, fn)
	}
	else {
		elem['on' + evType] = fn
	}
}

addEvent(window, 'load', function() {
	//Gets this script tag
	var myScript = this.myScript.shift();
	
	//взять строку запроса
	var queryString = getQueryString(myScript);
	//собираем параметры
	var width = getQueryStringArg(queryString, 'w', '');
	var height = getQueryStringArg(queryString, 'h', -1);
	var param_min = getQueryStringArg(queryString, 'min', '');
	var param_count = getQueryStringArg(queryString, 'num', '');
	var param_block = getQueryStringArg(queryString, 'block', '');
	if (height == 'auto') {
		if (param_count > 0) {
			height = constHeight * param_count + constTitleHeight;
		} else if (param_block) {
			var div = document.getElementById(param_block);
			height = div.offsetHeight;
		} else {
			height = myScript.parentNode.offsetHeight;
		}
		if (debug > 0) alert('Parent height:'+height);
	} else if (height == -1) {
		if (param_count > 0) height = constHeight * param_count + constTitleHeight;
	}
	
	if (width == 'auto') {
		width = myScript.parentNode.offsetWidth;
	}

	//тип вставки iframe || div
	var type = getQueryStringArg(queryString, 'type', 'iframe');
	var bannerPlaceElement = null;
	var bannerPlaceId = getQueryStringArg(queryString, 'bp', ''); //баннерная площадка

	if (type == 'div') {
		bannerPlaceElement = getDiv(width, height);
	} else {
		bannerPlaceElement = getiFrame(bannerPlaceId, width, height, param_min, param_count);
	}

	//передан id блока вствки
	if (param_block) {
		document.getElementById(param_block).appendChild(bannerPlaceElement);
	} else {
		//вставить в родительский тег
		myScript.parentNode.insertBefore(bannerPlaceElement, myScript.nextSibling);
	}
		
	//если div, аяксом берем начинку
	if (type == 'div') {
		var get_str = '/div?bp=' + bannerPlaceId + '&w=' + width;
		var height = getQueryStringArg(queryString, 'h', '');
		if (height) {
			get_str = get_str + '&h=' + height;
		}
		if (param_min) {
			get_str = get_str + '&min=' + param_min;
		}
		if (param_count) {
			get_str = get_str + '&num=' + param_count;
		}
		fillElementWithXmlHttpGet(get_str, bannerPlaceElement);
	}
});