/**
 * Copyright (C) 2002-2003, CodeHouse.com. All rights reserved.
 * CodeHouse(TM) is a registered trademark.
 *
 * THIS SOURCE CODE MAY BE USED FREELY PROVIDED THAT
 * IT IS NOT MODIFIED OR DISTRIBUTED, AND IT IS USED
 * ON A PUBLICLY ACCESSIBLE INTERNET WEB SITE.
 * 
 * CodeHouse.com JavaScript Library Module: Cookie Utility Class
 *
 * You can obtain this script at http://www.codehouse.com
 */ 
function CJL_CookieUtil(name, duration, path, domain, secure)
{
   this.affix = "";
   this.name = name;

   if( duration )
   {   	  
      var date = new Date();
	  var curTime = new Date().getTime();

	  date.setTime(curTime + (1000 * 60 * duration));
	  this.affix = "; expires=" + date.toGMTString();
   }
   
   if( path )
   {
      this.affix += "; path=" + path;
   }
   
   if( domain )
   {
      this.affix += "; domain=" + domain;
   }

   if( secure )
   {
      this.affix += "; secure=" + secure;
   }
   
   this.getValue = function()
   {
      var m = document.cookie.match(new RegExp("(" + this.name + "=[^;]*)(;|$)"));
      return m ? m[1] : null;
   }
   
   this.cookieExists = function()
   {
      return this.getValue() ? true : false;
   }
      
   this.expire = function()
   {
      var date = new Date();
	  date.setFullYear(date.getYear() - 1);
	  document.cookie=this.name + "=noop; expires=" + date.toGMTString(); 
   }
        
   this.setSubValue = function(key, value)
   {
		var ck = this.getValue();
		var newCookieStr = '';

		//escape key and value to avoid "&" and "=" tokens		
		key = this.urlEncode(key);
		value = this.urlEncode(value);
		
		//If cookie exists
		if(ck){
			ck = ck.replace(new RegExp('^' + this.name + '='),'');
			
			var keyValueCol = ck.split('&');
			for(var i=0; i < keyValueCol.length; i++){
				var keyValue = keyValueCol[i].split('=');
				if(keyValue[0] != key){
					newCookieStr += keyValueCol[i] + '&';
				}
			}

			if(value != '')
				newCookieStr += key + '=' + value + '&';

			//Removes the last '&'
			if(newCookieStr != '')
				newCookieStr = newCookieStr.substr(0,newCookieStr.length-1);
		}else if(value != ''){
			//Add cookie if value is set
			newCookieStr = key + '=' + value;
		}
		
		if(newCookieStr != '')
			document.cookie = this.name + '=' + newCookieStr + this.affix;
		else
			this.expire();
   }
      
   this.getSubValue = function(key)
   {
      var ck = this.getValue();

      if( ck )
      {
		ck = ck.replace(new RegExp(this.name + '='), '');
		
		key = this.urlEncode(key);
		
		var m = ck.split('&');
		for(var i = 0; i < m.length; i++){
			if(m[i].indexOf('=') >= 0){
				var keyValue = m[i].split('=');
				if(keyValue[0] == key)
					return this.urlDecode(keyValue[1]);
			}
		}
      }
	  
	  return '';
   }
   
   this.urlEncode = function(str){
		var SAFECHARS = "0123456789" +					// Numeric
				"ABCDEFGHIJKLMNOPQRSTUVWXYZ" +	// Alphabetic
				"abcdefghijklmnopqrstuvwxyz";
		var HEX = "0123456789ABCDEF";

	var plaintext = str;
	var encoded = "";
	for (var i = 0; i < plaintext.length; i++ ) {
		var ch = plaintext.charAt(i);
	    if (ch == " ") {
		    encoded += "+";				// x-www-urlencoded, rather than %20
		} else if (SAFECHARS.indexOf(ch) != -1) {
		    encoded += ch;
		} else {
		    var charCode = ch.charCodeAt(0);
			if (charCode > 255) {
				encoded += "+";
			} else {
				encoded += "%";
				encoded += HEX.charAt((charCode >> 4) & 0xF);
				encoded += HEX.charAt(charCode & 0xF);
			}
		}
	} // for
	return encoded;
   }
   
   this.urlDecode = function(str){
	var HEXCHARS = "0123456789ABCDEFabcdef"; 
	var encoded = str;
	var plaintext = "";
	var i = 0;
	while (i < encoded.length) {
		var ch = encoded.charAt(i);
		if (ch == "+") {
			plaintext += " ";
			i++;
		} else if (ch == "%") {
			if (i < (encoded.length-2) 
				&& HEXCHARS.indexOf(encoded.charAt(i+1)) != -1 
				&& HEXCHARS.indexOf(encoded.charAt(i+2)) != -1 ) {
				plaintext += unescape( encoded.substr(i,3) );
				i += 3;
			} else {
				plaintext += "%[ERROR]";
				i++;
			}
		} else {
		   plaintext += ch;
		   i++;
		}
	}
	return plaintext;
   }
}