// page init
function initPage(){
	initAutoScalingNav({
		menuId: "nav",
		sideClasses: true,
		minPaddings: 8,
		tag: "a"
	});
	initNav({
		menuId: "nav",
		hoverClass: "hover",
		dropExistenceClass: "has-drop-down",
		sideClasses: true,
		cleverMode: true,
		flexibility: true,
		menuPaddings: 10,
		minWidth: 100
	});
}

// mobile browsers detect
browserPlatform = {
	platforms: [
		{
			// Blackberry <5
			uaString:['BlackBerry','midp'],
			cssFile:'blackberry.css'
		},
		{
			// Symbian phones
			uaString:['symbian','midp'],
			cssFile:'symbian.css'
		},
		{
			// Opera Mobile
			uaString:['opera','mobi'],
			cssFile:'opera.css'
		},
		{
			// IE Mobile <6
			uaString:['msie','ppc'],
			cssFile:'ieppc.css'
		},
		{
			// IE Mobile 6+
			uaString:'iemobile',
			cssFile:'iemobile.css'
		},
		{
			// Palm WebOS
			uaString:'webos',
			cssFile:'webos.css'
		},
		{
			// Android
			uaString:'Android',
			cssFile:'android.css'
		},
		{
			// Blackberry 6+
			uaString:['BlackBerry','6.0','mobi'],
			cssFile:'blackberry6.0.css'
		},
		{
			// iPad
			uaString:'ipad',
			cssFile:'ipad.css',
			miscHead:''
		},
		{
			// iPhone and other webkit browsers
			uaString:['safari','mobi'],
			cssFile:'safari.css',
			miscHead:''
		}
	],
	options: {
		cssPath:'css/',
		mobileCSS:'allmobile.css'
	},
	init:function(){
		this.checkMobile();
		this.parsePlatforms();
		return this;
	},
	checkMobile: function() {
		if(this.uaMatch('mobi') || this.uaMatch('midp') || this.uaMatch('ppc') || this.uaMatch('webos')) {
			this.attachStyles({cssFile:this.options.mobileCSS});
		}
	},
	parsePlatforms: function() {
		for(var i = 0; i < this.platforms.length; i++) {
			if(typeof this.platforms[i].uaString === 'string') {
				if(this.uaMatch(this.platforms[i].uaString)) {
					this.attachStyles(this.platforms[i]);
					break;
				}
			} else {
				for(var j = 0, allMatch = true; j < this.platforms[i].uaString.length; j++) {
					if(!this.uaMatch(this.platforms[i].uaString[j])) {
						allMatch = false;
					}
				}
				if(allMatch) {
					this.attachStyles(this.platforms[i]);
					break;
				}
			}
		}
	},
	attachStyles: function(platform) {
		if(platform.cssFile) {
			document.write('<link rel="stylesheet" href="' + this.options.cssPath + platform.cssFile + '" type="text/css"/>');
		}
		if(platform.miscHead) {
			document.write(platform.miscHead);
		}
	},
	uaMatch:function(str) {
		if(!this.ua) {
			this.ua = navigator.userAgent.toLowerCase();
		}
		return this.ua.indexOf(str.toLowerCase()) != -1;
	}
}.init();

// drop-down init
function initNav(o)
{
	if (!o.menuId) o.menuId = "main-nav";
	if (!o.cleverMode) o.cleverMode = false;
	if (!o.flexibility) o.flexibility = false;
	if (!o.dropExistenceClass) o.dropExistenceClass = false;
	if (!o.hoverClass) o.hoverClass = "hover";
	if (!o.menuHardCodeClass) o.menuHardCodeClass = "menu-hard-code";
	if (!o.sideClasses) o.sideClasses = false;
	if (!o.center) o.center = false;
	if (!o.menuPaddings) o.menuPaddings = 0;
	if (!o.minWidth) o.minWidth = 0;
	if (!o.coeff) o.coeff = 1.7;
	var n = document.getElementById(o.menuId);
	if(n){
		n.className = n.className.replace(o.menuHardCodeClass, "");
		var lfl = [];
		var li = n.getElementsByTagName("li");
		for (var i=0; i<li.length; i++) {
			
			li[i].className += (" " + o.hoverClass);
			var d = li[i].getElementsByTagName("div").item(0);
			if(li[i].parentNode == n){
				var _ul = li[i].getElementsByTagName("ul").item(0);
				if(_ul){
					if(li[i].offsetWidth > _ul.offsetWidth){
						_ul.style.width = li[i].offsetWidth + 'px';
					}
				}
			}
			if(d)
			{
				if(o.flexibility)
				{
					var a = d.getElementsByTagName("a");
					for (var j=0; j<a.length; j++)
					{
						var w = a[j].parentNode.parentNode.offsetWidth;
						if(w > 0)
						{
							if(typeof(o.minWidth) == "number" && w < o.minWidth)
								w = o.minWidth;
							else if(typeof(o.minWidth) == "string" && li[i].parentNode == n && w < li[i].offsetWidth)
								w = li[i].offsetWidth - 5;
							a[j].style.width = w - o.menuPaddings + "px";
						}
					}
					d.style.width = li[i].getElementsByTagName("div").item(1).clientWidth + "px";
				}
				var t = document.documentElement.clientWidth/o.coeff;
				if(li[i].parentNode != n && (!o.cleverMode || fPX(li[i]) < t))
				{
					d.style.right = "auto";
					d.style.left = li[i].parentNode.offsetWidth + "px";
					d.parentNode.className += " left-side";
				}	
				else if(li[i].parentNode != n && (o.cleverMode || fPX(li[i]) >= t))
				{
					d.style.left = "auto";
					d.style.right = li[i].parentNode.offsetWidth + "px";
					d.parentNode.className += " right-side";
				}
				else if(li[i].parentNode == n && o.cleverMode && fPX(li[i]) >= t)
				{
					li[i].className += " right-side";
				}
				if(li[i].parentNode == n && o.center)
					d.style.left = -li[i].getElementsByTagName("div").item(1).clientWidth/2 + li[i].clientWidth/2 + "px";
			}
			if(o.dropExistenceClass && li[i].getElementsByTagName("ul").length > 0)
			{
				li[i].className += (" " + o.dropExistenceClass);
				li[i].getElementsByTagName("a").item(0).className += (" " + o.dropExistenceClass + "-link");
				li[i].innerHTML += "<em class='pointer'></em>";
			}
			if(li[i].parentNode == n) lfl.push(li[i]);
		}
		if(o.sideClasses)
		{
			lfl[0].className += " first-child";
			lfl[0].getElementsByTagName("a").item(0).className += " first-child-link";
			lfl[lfl.length-1].className += " last-child";
			lfl[lfl.length-1].getElementsByTagName("a").item(0).className += " last-child-link";
		}
		for (var i=0; i<li.length; i++)
		{
			li[i].className = li[i].className.replace(o.hoverClass, "");
			li[i].onmouseover = function()
			{
				this.className += (" " + o.hoverClass);
			}
			li[i].onmouseout = function()
			{
				this.className = this.className.replace(o.hoverClass, "");
			}
		}
	}
	function fPX(a)
	{
		var b = 0;
		while (a.offsetParent) {b += a.offsetLeft; a = a.offsetParent;}
		return b;
	}
}

// auto scaling init
function initAutoScalingNav(o)
{
	if (!o.menuId) o.menuId = "main-nav";
	if (!o.tag) o.tag = "a";
	if (!o.spacing) o.spacing = 0;
	if (!o.constant) o.constant = 0;
	if (!o.minPaddings) o.minPaddings = 0;
	if (!o.liHovering) o.liHovering = false;
	if (!o.sideClasses) o.sideClasses = false;
	var nav = document.getElementById(o.menuId);
	if(nav)
	{
		var lis = nav.getElementsByTagName("li");
		var asFl = [];
		var lisFl = [];
		for (var i=0, j=0; i<lis.length; i++)
		{
			if(lis[i].parentNode == nav)
			{
				var t = lis[i].getElementsByTagName(o.tag).item(0);
				asFl.push(t);
				asFl[j++].width = t.offsetWidth;
				lisFl.push(lis[i]);
			}
			if(o.liHovering)
			{
				lis[i].onmouseover = function()
				{
					this.className += " hover";
				}
				lis[i].onmouseout = function()
				{
					this.className = this.className.replace("hover", "");
				}
			}
		}
		var menuWidth = nav.clientWidth - asFl.length*o.spacing - o.constant;
		if(getItemsWidth(asFl) < menuWidth)
		{
			for (var i=0; getItemsWidth(asFl) < menuWidth; i++)
			{
				asFl[i].width++;
				if(i >= asFl.length-1) i=-1;
			}
			for (var i=0; i<asFl.length; i++)
			{
				asFl[i].style.width = asFl[i].width - 1 + "px";
			}
		}
		else if(o.minPaddings > 0)
		{
			for (var i=0; i<asFl.length; i++)
			{
				asFl[i].style.width = asFl[i].width + o.minPaddings*2 + "px";
			}
		}
	}
	function getItemsWidth(a)
	{
		var w = 0;
		for(var q=0; q<a.length; q++)
		{
			w += a[q].width;
		}
		return w;
	}
	if(o.sideClasses)
	{
		lisFl[0].className += " first-child";
		lisFl[lisFl.length-1].className += " last-child";
	}
}

if (window.addEventListener)
	window.addEventListener("load", initPage, false);
else if (window.attachEvent)
	window.attachEvent("onload", initPage);