/* namspace gmds */
var gmds = gmds || 
{ 
	"REFERRER_COOKIE" : "gmds_referrer"
};


/**
 * Check variable if it is empty or undefined.
 */
gmds.empty =  function(variable)
{
	return (typeof(variable) === "undefined" || variable === "");
};

/**
 * FlashCheck class.
 */
gmds.flashCheck = function () 
{
	// constants
	var /* String */ 	BANDWIDTH_COOKIE = "bandwidth";
	
	var /* String */ 	FLASH_SELECTOR = ".flash";
	
	// parameter
	var /* int */		minFlashVersion = 8;

	// URL parts
	var /* String */ 	url = window.location.pathname + window.location.search;
	var /* String */ 	selector = "";
	var /* String */ 	extension = "";
	var /* String */ 	query = "";
	var /* String */ 	anchor = "";

	// private methods
	/**
	 * init method, constuctor
	 */
	var init = function() {
		var /* int */ startQuery = url.indexOf('?');
		var /* int */ startAnchor = url.indexOf('#');
		if (startQuery > 0 && startAnchor == -1) {
			query = url.substring(startQuery, url.length);
			url = url.substring(0, startQuery);
			anchor = "";
		} else if (startQuery > 0 && startAnchor > startQuery) {
			query = url.substring(startQuery, startAnchor);
			anchor = url.substring(startAnchor, url.length);
			url = url.substring(0, startQuery);
		} else if (startAnchor > 0) {
			anchor = url.substring(startAnchor, url.length);
			url = url.substring(0, startAnchor);
		}
		// split extension
		var /* int */ startDot = url.lastIndexOf('.');
		if (startDot > 0) {
			extension = url.substring(startDot, url.length);
			url = url.substring(0, startDot);
		}
	};
	
	/**
	 * The referrer must be stored for correct tracking by Omniture. See also the content.jsp of t02_home.
	 */
	var storeReferrer = function() {
		if (document.referrer !== null && !gmds.empty(document.referrer)) {
			gmds.setCookie(gmds.REFERRER_COOKIE, document.referrer, 15 * 1000);
		}
	};
	
	/**
	 * This function checks whether flash version 8 or higher is installed or not.
	 */
	this.isFlashInstalled = function() {
		// check flash version
		var isIE=(navigator.appVersion.indexOf("MSIE") != -1) ? true : false;
		var isWin=(navigator.appVersion.toLowerCase().indexOf("win") != -1) ? true : false;

		if(isIE && isWin) {
			try {
				return ((typeof(ActiveXObject) == "function") && (typeof(new ActiveXObject("ShockwaveFlash.ShockwaveFlash.8")) == "object"));
			} catch (error) {
				return false;
			}
		} else if (navigator.mimeTypes && navigator.mimeTypes["application/x-shockwave-flash"]) {
			var flashplugin = navigator.mimeTypes["application/x-shockwave-flash"].enabledPlugin;
			var flashplugindesc;
			if (flashplugin!==null && flashplugin.description) {
				flashplugindesc = parseInt(flashplugin.description.substring(flashplugin.description.indexOf(".")-2),10);
			}
		   	return !(!flashplugindesc || flashplugindesc < minFlashVersion);
		} else {
			return false;
		}
	};
	
	/**
	 * This function test if the upload of an image is done in a given maximal time. A cookie will be set and a
	 * function will be executed with the result of this test. The functions can be used to do the redirect. Please
	 * notice that in both cases (success and fail of the test) a redirect can be reasonable.
	 */
	this.testBandwidth = function(/*int*/maxBandwidthTime, /* String */bandwidthImage, /* int */cookieExpires, func) {
		start = (new Date()).getTime();
		var img = new Image();
		img.src = bandwidthImage + '?t=' + escape(start);
		img.onload = function() {
			var end = (new Date()).getTime();
			var flashWorks = end - start < maxBandwidthTime;
			if (flashWorks) {
				// store result in cookie
				gmds.setCookie(BANDWIDTH_COOKIE, "true", cookieExpires);
				// flash works
				func(true);
			} else {
				// store result in cookie
				gmds.setCookie(BANDWIDTH_COOKIE, "false", cookieExpires);
				// flash does not work
				func(false);
			}
		};
	};
	
	/**
	 * If flash is installed and the bandwidth check ends successfully this function will redirect to the page
	 * itself but with the FLASH_SELECTOR added.
	 */
	this.doT02FlashCheck = function (/*int*/maxBandwidthTime, /* String */bandwidthImage, /* int */cookieExpires) {
		// check for flash
		if (this.isFlashInstalled()) {
			/*
			 * This function will be executed if both test (flash and bandwidth) end successfully. The flashWorks
			 * variable is necessary for the bandwidth check.
			 */
			var func = function(flashWorks) {
				if (flashWorks) {
					selector += FLASH_SELECTOR;
					
					storeReferrer();
					if (url == "/") {
						if (query != '') {
							query = "#" + query;
						}
						window.location.replace('flash.html' + query + anchor);
					} else {
						window.location.replace(url + selector + extension + query + anchor);
					}
				}
			}

			// check for bandwidth
			if (gmds.getCookie(BANDWIDTH_COOKIE) == null) {
				this.testBandwidth(/*int*/maxBandwidthTime, /* String */bandwidthImage, /* int */cookieExpires, func);
			} else if (gmds.getCookie(BANDWIDTH_COOKIE) == "true") {
				func(true);
			}
		}
	};
	
	/**
	 * This functions redirects to the given redirectTarget if flash is not installed or the bandwidth is not hight enough. 
	 */
	this.doFlashFallbackRedirect = function (/*int*/maxBandwidthTime, /* String */bandwidthImage, /* int */cookieExpires, /* String */ redirectTarget) {
		/*
		 * This function will be executed if either of the tests (flash and bandwidth) fails. The flashWorks
		 * variable is necessary for the bandwidth check. 
		 */
		var func = function(flashWorks) {
			if (!flashWorks) {
				window.location.replace(redirectTarget);
			}
		}
		
		if (!this.isFlashInstalled()) {
			func(false);
		} else {
			// check for bandwidth
			if (gmds.getCookie(BANDWIDTH_COOKIE) == null) {
				this.testBandwidth(/*int*/maxBandwidthTime, /* String */bandwidthImage, /* int */cookieExpires, func);
			} else if (gmds.getCookie(BANDWIDTH_COOKIE) == "false") {
				func(false);
			}
		}
	};

	init();
	
};