/* =====================================================================================

General functions file for various javascript functions

======================================================================================== */


var hmiFunctions = {};				//Creates object for functions in this file to avoid conflicts



/* --------------------------------------------------------------------------------
   hmiFunctions.getReferrer
   Function determines page view referrer
      
   Parameters: none
   Returns:    String
----------------------------------------------------------------------------------- */

hmiFunctions.getReferrer = function(){
        var referrer = document.referrer;
        
        if (referrer == "") {
        	referrer = 'direct';
        }
		return referrer
}


/* --------------------------------------------------------------------------------
   hmiFunctions.osDetect
   Function determines operating system that is being used to view the content
   
   Parameters: none
   Returns:    String
----------------------------------------------------------------------------------- */

hmiFunctions.osDetect = function(){
	var userAgent = navigator.userAgent
	var agentArray = userAgent.split(';');
	var osValue = agentArray[2];
	return osValue;
}


/* --------------------------------------------------------------------------------
   hmiFunctions.browserDetect
   Function determines browser type and version being used to view the content
   
   Parameters: none
   Returns:    Array    [0]=browser type    [1]=browser version
----------------------------------------------------------------------------------- */

hmiFunctions.browserDetect = function(){
	var browserArray = new Array();
	
	var BrowserDetect = {
		init: function () {
			this.browser = this.searchString(this.dataBrowser) || "An unknown browser";
			this.version = this.searchVersion(navigator.userAgent)
				|| this.searchVersion(navigator.appVersion)
				|| "an unknown version";
		},
		searchString: function (data) {
			for (var i=0;i<data.length;i++)	{
				var dataString = data[i].string;
				var dataProp = data[i].prop;
				this.versionSearchString = data[i].versionSearch || data[i].identity;
				if (dataString) {
					if (dataString.indexOf(data[i].subString) != -1)
						return data[i].identity;
				}
				else if (dataProp)
					return data[i].identity;
			}
		},
		searchVersion: function (dataString) {
			var index = dataString.indexOf(this.versionSearchString);
			if (index == -1) return;
			return parseFloat(dataString.substring(index+this.versionSearchString.length+1));
		},
		dataBrowser: [
			{
				string: navigator.userAgent,
				subString: "Chrome",
				identity: "Chrome"
			},
			{ 	string: navigator.userAgent,
				subString: "OmniWeb",
				versionSearch: "OmniWeb/",
				identity: "OmniWeb"
			},
			{
				string: navigator.vendor,
				subString: "Apple",
				identity: "Safari",
				versionSearch: "Version"
			},
			{
				prop: window.opera,
				identity: "Opera"
			},
			{
				string: navigator.vendor,
				subString: "iCab",
				identity: "iCab"
			},
			{
				string: navigator.vendor,
				subString: "KDE",
				identity: "Konqueror"
			},
			{
				string: navigator.userAgent,
				subString: "Firefox",
				identity: "Firefox"
			},
			{
				string: navigator.vendor,
				subString: "Camino",
				identity: "Camino"
			},
			{		// for newer Netscapes (6+)
				string: navigator.userAgent,
				subString: "Netscape",
				identity: "Netscape"
			},
			{
				string: navigator.userAgent,
				subString: "MSIE",
				identity: "Explorer",
				versionSearch: "MSIE"
			},
			{
				string: navigator.userAgent,
				subString: "Gecko",
				identity: "Mozilla",
				versionSearch: "rv"
			},
			{ 		// for older Netscapes (4-)
				string: navigator.userAgent,
				subString: "Mozilla",
				identity: "Netscape",
				versionSearch: "Mozilla"
			}
		]
	
	};
	
	BrowserDetect.init();
	
	browserArray[0] = BrowserDetect.browser;
	browserArray[1] = BrowserDetect.version;
		
	return browserArray;
}