/**
	provides helper functions for better usage of cookies with JavaScript
	(see http://www.elated.com/articles/javascript-and-cookies/)

*/

//printf-debugging support
var debugConsole = window.console;

if (!window.console) {
  debugConsole = {
    log:   function() {},
    debug: function() {},
    print: function() {},
    isDummy: true
  };
  
  try {
    window.console = debugConsole;
  } catch (e) {
    // we don't really care
  }
}

/**
	sets a cookie to a value
	name: the name of the cookie
	value: the value to store within the cookie
	validity: (optional) the duration of validity for this cookie (in ms)
	path: (optional) the path for which the cookie is valid
	domain: (optional) the domain for which the cookie is valid
	
*/
function /*void*/ set_cookie(/*String*/name, /*String*/value, /*int*/validity, /*String*/path, /*String*/domain, /*boolean*/secure )
{
	var cookie_string = name + "=" + escape (value);
	if (validity) {
		var curDate = new Date();
		var expiry = new Date(curDate.getTime() + validity);
		cookie_string += "; expires=" + expiry.toGMTString();
	}
	if (path) {
		cookie_string += "; path=" + escape (path);
	}
	if (domain) {
		cookie_string += "; domain=" + escape (domain);
	}
	if (secure) {
		cookie_string += "; secure";
	}
	debugConsole.log("Setting Cookie '"+cookie_string);
	document.cookie = cookie_string;
}

/**
	deletes a cookie
	name: the name of the cookie to delete
*/
function /*void*/ delete_cookie(/*String*/name, /* String */ path)
{
	/* set the cookie with empty value, and validity -1 --> deletes it */
	set_cookie(name, "", -1, path);
	var cookie_info = get_cookie_info(name);
	if (cookie_info) {
		debugConsole.log("Cookie '"+name+"' was not deleted, cookie_info: " + cookie_info);
		/* let's try with "/" path */
		if (!path) {
			delete_cookie(name, "/");
		}
	}
}

/**
get all info stored about a cookie value
name: the name of the cookie whose value should be retrieved
*/
function /*String*/ get_cookie_info(/*String*/name)
{
var results = document.cookie.match(name + '=(.*?)(;|$)');
if (results)
  return (unescape(results[1]));
else
  return null;
}

/**
	gets a cookie value
	name: the name of the cookie whose value should be retrieved
*/
function /*String*/ get_cookie(/*String*/name)
{
	var results = document.cookie.match(name + '=(.*?)(;|$)');
	if (results)
	  return (unescape(results[1]));
	else
	  return null;
}

/**
 * 
 * @return all valid cookie names as array
 */
function get_cookie_list() {
	// list all matches (
	var list = new Array();
	results = document.cookie.split(";");
	for (var result in results) {
		var xxx = String(results[result]) + ";";
		var groups = xxx.match(/([^\s]*?)=(.*?)(;|$)/);
		// only the first group contains the cookie name
		if(groups != null){
			list.push(groups[1]);
		}
	}
	return list;
}

/**
 * Checks if the user has cookies enabled. If cookies are enabled the form
 * from which this method is called will be submitted. Otherwise the user will be 
 * forwarded to the given landing page with a login layer and a reminder to enable 
 * cookies.
 *
 */
function checkCookieAvailability(funcCheckOk, funcCheckFailed){
	set_cookie('dccookieenabled', 'enabled', '', '/', '', '' );
	if (get_cookie('dccookieenabled')){
		funcCheckOk();
	}
	else{
		funcCheckFailed();
	}
	delete_cookie('dccookieenabled');
}

/**
 * adds a Loginlayer type "ll3 - no cookies activated"
 * to the given link
 */
function getLinkWithLoginLayer(){
	var newUrl = window.location.href;
	var paramPos = parseInt(newUrl.indexOf('errorstate'));
	if (paramPos > 0) {
		newUrl = newUrl.substring(0,paramPos+11) + "ll3" + newUrl.substring(paramPos+15);  
	} else {
		if (newUrl.indexOf('?') > 0) {
			newUrl = newUrl + "&errorstate=ll3";
		} else {
			newUrl = newUrl + "?errorstate=ll3";
		}
	}
	window.location.href = newUrl;	
}