// ======================================================================
// Session
// ======================================================================

var Session = Class.create({
	// ----------------------------------------------------------------------
	// Constructor
	// ----------------------------------------------------------------------
	initialize: function()
	{
		this.admin = false;
		this.loggedIn = false;
		this.canAddLearners = false;
		this.canDeleteLearners = false;
		this.canEditLearners = false;
		this.canReportLearners = false;
		this.username = '';
		
		// Events
		this.fetchDetails_success = null;
		this.fetchDetails_failed = null;
	}
	
	// ----------------------------------------------------------------------
	// fetchDetails
	// ----------------------------------------------------------------------
	,fetchDetails: function()
	{
		var sUrl = "./v2_services/session.php";
		var oDTO = new Object ();
	
		var oParameters = new Object();
		oParameters._method = 'GET';
		oParameters.dto = Object.toJSON(oDTO);
	
		new Ajax.Request (sUrl, {parameters: oParameters
								,onSuccess: this.ajax_success.bind(this)
								,onFailure: this.ajax_failure.bind(this)});
	}
	
	// ----------------------------------------------------------------------
	// ajax_success()
	// ----------------------------------------------------------------------
	,ajax_success: function(p_oTransport)
	{
		if (   p_oTransport.responseJSON.type == "success"
		    && p_oTransport.responseJSON.dtoType == "SessionDTO")
		{
			var oResult = p_oTransport.responseJSON.encodedResultDTO.evalJSON(true);
			this.admin = oResult.admin;
			this.loggedIn = oResult.loggedIn;
			this.canAddLearners = oResult.canAddLearners;
			this.canDeleteLearners = oResult.canDeleteLearners;
			this.canEditLearners = oResult.canEditLearners;
			this.canReportLearners = oResult.canReportLearners;
			this.username = oResult.username;
			
			if (typeof this.fetchDetails_failed == 'function')
			{
				this.fetchDetails_success(this);
			}
		}
		else
		{
			this.ajax_failure(p_oTransport);
		}
	}

	// ----------------------------------------------------------------------
	// ajax_failure()
	// ----------------------------------------------------------------------
	,ajax_failure: function(p_oTransport)
	{
		if (typeof this.fetchDetails_success == 'function')
		{
			this.fetchDetails_success(this);
		}
	}
});

// ----------------------------------------------------------------------
// handleAjaxError()
// ----------------------------------------------------------------------

function handleAjaxError (p_oResponseJSON, p_sCallback)
{
	var sCallback = (p_sCallback == undefined ? "refreshScreen" : p_sCallback);

	if (p_oResponseJSON.type == "user_error")
	{
		if (p_oResponseJSON.errorName == "errorNotLoggedIn")
		{
			showMessage (MSG_ERROR, "Your login has expired. Before continuing you will need to log in to the system again.", sCallback);
		}
		else if (p_oResponseJSON.errorName == "serverError")
		{
			showMessage (MSG_ERROR, "There was an error communicating with the server.", sCallback);
		}
	}
	else if (p_oResponseJSON.type == "server_error")
	{
		showMessage (MSG_ERROR, "There was an error communicating with the server.", sCallback);
	}
}

// ----------------------------------------------------------------------
// refreshScreen
// ----------------------------------------------------------------------

function refreshScreen ()
{
	hideMessage ();

	try
	{
		top.location.replace ("index.php");
	}
	catch (oError)
	{
	}
}

// ----------------------------------------------------------------------
// CPaintResult()
// ----------------------------------------------------------------------
function CPaintResult(p_oResult)
{
	try
	{
		this.success = (p_oResult.elumos[0].result[0].success[0].data == "y");
	}
	catch(e)
	{
		this.success = false;
	}
	if (!this.success)
	{
		try
		{
			this.message = p_oResult.elumos[0].result[0].message[0].data;
		}
		catch(e)
		{
		}
	}
}

// ----------------------------------------------------------------------
// setEnabledState()
// ----------------------------------------------------------------------
function setEnabledState(p_sId, p_bEnabled)
{
	var oElement = document.getElementById(p_sId);
	
	if (oElement.nodeName == "INPUT")
	{
		if (oElement.type == "text")
		{
			oElement.disabled = !p_bEnabled;
			oElement.className = (p_bEnabled ? "textField" : "textFieldReadOnly");
		}
		if (oElement.type == "checkbox")
		{
			oElement.disabled = !p_bEnabled;
		}
	}
	else if (oElement.nodeName == "P")
	{
		if (oElement.className == "formLabel" || oElement.className == "formLabelDisabled")
		{
			oElement.className = (p_bEnabled ? "formLabel" : "formLabelDisabled");
		}
	}
}

// ----------------------------------------------------------------------
// disableElement()
// ----------------------------------------------------------------------
function disableElement(p_oElement)
{
	if (p_oElement.nodeName == "INPUT")
	{
		if (p_oElement.type == "text")
		{
			p_oElement.disabled = true;
			p_oElement.className = "textFieldReadOnly";
		}
		if (p_oElement.type == "checkbox")
		{
			p_oElement.disabled = true;
		}
	}
	else if (p_oElement.nodeName == "P")
	{
		if (p_oElement.className == "formLabel" || p_oElement.className == "formLabelDisabled")
		{
			p_oElement.className = "formLabelDisabled";
		}
	}
}

// ----------------------------------------------------------------------
// enableElement()
// ----------------------------------------------------------------------
function enableElement(p_oElement)
{
	if (p_oElement.nodeName == "INPUT")
	{
		if (p_oElement.type == "text")
		{
			p_oElement.disabled = false;
			p_oElement.className = "textField";
		}
		else if (p_oElement.type == "checkbox")
		{
			p_oElement.disabled = false;
		}
	}
	else if (p_oElement.nodeName == "P")
	{
		if (p_oElement.className == "formLabel" || p_oElement.className == "formLabelDisabled")
		{
			p_oElement.className = "formLabel";
		}
	}
}

// ----------------------------------------------------------------------
// createDelegate()
// ----------------------------------------------------------------------
function createDelegate(p_oObject, p_fMethod)
{
	var oFunction = function()
	{
		var m_oTarget = arguments.callee.m_oTarget;
		var m_oMethod = arguments.callee.m_oMethod;
		return m_oMethod.apply(m_oTarget, arguments);
	};
	oFunction.m_oTarget = p_oObject;
	oFunction.m_oMethod = p_fMethod;
	return oFunction;
}

// ----------------------------------------------------------------------
// openWindow()
// ----------------------------------------------------------------------
function openWindow(p_sURL, p_sName, p_sFeatures, p_bFocusOnWindow)
{
	var oWindow = window.open(p_sURL, p_sName, p_sFeatures);
	var bFocusOnWindow = (p_bFocusOnWindow == undefined ? false : p_bFocusOnWindow);

	if(oWindow == null || typeof(oWindow) == "undefined")
	{
		var nMessageType = MSG_INFO;
		var sMessageText = "You appear to have a popup blocker switched on. Please choose to allow popups from this website, then click on the link again to view the content."; 

		showMessage(nMessageType, sMessageText);
	}
	else if(bFocusOnWindow == true)
	{
		try
		{
			oWindow.focus();
		}
		catch (error){}
	}

	return oWindow;
}

// ======================================================================
// Message box 
// ======================================================================
var MSG_COMM = 0; // no buttons, wait to clear
var MSG_SUCCESS = 1; // ok button, tick
var MSG_ERROR = 2; // ok button, cross
var MSG_CONFIRM = 3; // ok, cancel, exclamation mark
var MSG_INFO = 4;
var MSG_COMM_CANCEL = 5;


// ----------------------------------------------------------------------
// showMessage()
// ----------------------------------------------------------------------
function showMessage(p_nType, p_sText, p_sCallback, p_sArgs)
{
	parent.showMessage(p_nType, p_sText, p_sCallback, p_sArgs);
}

// ----------------------------------------------------------------------
// hideMessage()
// ----------------------------------------------------------------------
function hideMessage()
{
	parent.hideMessage();
}




// ----------------------------------------------------------------------
// isIE5()
// ----------------------------------------------------------------------
function isIE5()
{
	return(navigator.userAgent.indexOf('MSIE 5') != -1);
}

// ----------------------------------------------------------------------
// truncateString()
// ----------------------------------------------------------------------
function truncateString(p_sString, p_nMaxLength)
{
	if (p_sString.length > p_nMaxLength)
	{
		return (p_sString.substring(0, (p_nMaxLength-3)) + '...'   );
	}
	else
	{
		return p_sString;
	}
}

// ----------------------------------------------------------------------
// getValueInString()
// ----------------------------------------------------------------------
function getValueInString(sLabel,sString)
{
	var sFindString = sLabel + "=";
	var nStartPos = sString.indexOf(sFindString) + sFindString.length;
	var nEndPos = sString.indexOf("&",nStartPos);
	nEndPos = (nEndPos == -1) ? sString.length : nEndPos;
	return(sString.substring(nStartPos, nEndPos));
}

// ----------------------------------------------------------------------
// getNamedElement()
// ----------------------------------------------------------------------
function getNamedElement(oObj, sTagName, sName)
{
	var aElements = oObj.getElementsByTagName(sTagName);
	for (i=0; i < aElements.length; i++)
	{
		if (aElements[i].name == sName) 
		{ 
			return(aElements[i]); 
		};
	};
}

// ----------------------------------------------------------------------
// getformValue()
// ----------------------------------------------------------------------
function getFormValue(p_sId)
{
	return document.getElementById(p_sId).value;
}
function setFormValue(p_sId, p_sValue)
{
	document.getElementById(p_sId).value = p_sValue;
}

// ======================================================================
// Page elements
// ======================================================================

// ----------------------------------------------------------------------
// drawHeader()
// ----------------------------------------------------------------------
function drawHeader()
{
	// drawOverlay();
};

// ----------------------------------------------------------------------
// drawFooter()
// ----------------------------------------------------------------------
function drawFooter()
{
	document.write('<div class="footer" style="margin-top:5px;padding-left:1px;">');
	document.write('Powered by <a href="http://www.cylix.co.uk/offer_lms.html" style="color:#FFFFFF;text-decoration:none;" target="_blank">Elumos</a>. Copyright &#169; <a href="http://www.cylix.co.uk" style="color:#FFFFFF;text-decoration:none;" target="_blank">Cylix</a> 2011');
	document.write('</div>');
};

// ----------------------------------------------------------------------
// testSubmit()
// ----------------------------------------------------------------------
// Used on form fields to detect enter key presses and force an onclick on the specified button
function testSubmit(p_oInput,p_sButton,e)
{
	var keycode;
	if (window.event) keycode = window.event.keyCode;
	else if (e) keycode = e.which;
	else return true;

	if (keycode == 13)
	{
		document.getElementById(p_sButton).onclick();
		return false;
	}
	else
		return true;
}

// ======================================================================
//  MD5 Algorithm
// ======================================================================
/*
 * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message
 * Digest Algorithm, as defined in RFC 1321.
 * Version 2.1 Copyright (C) Paul Johnston 1999 - 2002.
 * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
 * Distributed under the BSD License
 * See http://pajhome.org.uk/crypt/md5 for more info.
 */

/*
 * Configurable variables. You may need to tweak these to be compatible with
 * the server-side, but the defaults work in most cases.
 */
var hexcase = 0;  /* hex output format. 0 - lowercase; 1 - uppercase        */
var b64pad  = ""; /* base-64 pad character. "=" for strict RFC compliance   */
var chrsz   = 8;  /* bits per input character. 8 - ASCII; 16 - Unicode      */

/*
 * These are the functions you'll usually want to call
 * They take string arguments and return either hex or base-64 encoded strings
 */
function hex_md5(s){ return binl2hex(core_md5(str2binl(s), s.length * chrsz));}
function b64_md5(s){ return binl2b64(core_md5(str2binl(s), s.length * chrsz));}
function str_md5(s){ return binl2str(core_md5(str2binl(s), s.length * chrsz));}
function hex_hmac_md5(key, data) { return binl2hex(core_hmac_md5(key, data)); }
function b64_hmac_md5(key, data) { return binl2b64(core_hmac_md5(key, data)); }
function str_hmac_md5(key, data) { return binl2str(core_hmac_md5(key, data)); }

/*
 * Perform a simple self-test to see if the VM is working
 */
function md5_vm_test()
{
  return hex_md5("abc") == "900150983cd24fb0d6963f7d28e17f72";
}

/*
 * Calculate the MD5 of an array of little-endian words, and a bit length
 */
function core_md5(x, len)
{
  /* append padding */
  x[len >> 5] |= 0x80 << ((len) % 32);
  x[(((len + 64) >>> 9) << 4) + 14] = len;

  var a =  1732584193;
  var b = -271733879;
  var c = -1732584194;
  var d =  271733878;

  for(var i = 0; i < x.length; i += 16)
  {
    var olda = a;
    var oldb = b;
    var oldc = c;
    var oldd = d;

    a = md5_ff(a, b, c, d, x[i+ 0], 7 , -680876936);
    d = md5_ff(d, a, b, c, x[i+ 1], 12, -389564586);
    c = md5_ff(c, d, a, b, x[i+ 2], 17,  606105819);
    b = md5_ff(b, c, d, a, x[i+ 3], 22, -1044525330);
    a = md5_ff(a, b, c, d, x[i+ 4], 7 , -176418897);
    d = md5_ff(d, a, b, c, x[i+ 5], 12,  1200080426);
    c = md5_ff(c, d, a, b, x[i+ 6], 17, -1473231341);
    b = md5_ff(b, c, d, a, x[i+ 7], 22, -45705983);
    a = md5_ff(a, b, c, d, x[i+ 8], 7 ,  1770035416);
    d = md5_ff(d, a, b, c, x[i+ 9], 12, -1958414417);
    c = md5_ff(c, d, a, b, x[i+10], 17, -42063);
    b = md5_ff(b, c, d, a, x[i+11], 22, -1990404162);
    a = md5_ff(a, b, c, d, x[i+12], 7 ,  1804603682);
    d = md5_ff(d, a, b, c, x[i+13], 12, -40341101);
    c = md5_ff(c, d, a, b, x[i+14], 17, -1502002290);
    b = md5_ff(b, c, d, a, x[i+15], 22,  1236535329);

    a = md5_gg(a, b, c, d, x[i+ 1], 5 , -165796510);
    d = md5_gg(d, a, b, c, x[i+ 6], 9 , -1069501632);
    c = md5_gg(c, d, a, b, x[i+11], 14,  643717713);
    b = md5_gg(b, c, d, a, x[i+ 0], 20, -373897302);
    a = md5_gg(a, b, c, d, x[i+ 5], 5 , -701558691);
    d = md5_gg(d, a, b, c, x[i+10], 9 ,  38016083);
    c = md5_gg(c, d, a, b, x[i+15], 14, -660478335);
    b = md5_gg(b, c, d, a, x[i+ 4], 20, -405537848);
    a = md5_gg(a, b, c, d, x[i+ 9], 5 ,  568446438);
    d = md5_gg(d, a, b, c, x[i+14], 9 , -1019803690);
    c = md5_gg(c, d, a, b, x[i+ 3], 14, -187363961);
    b = md5_gg(b, c, d, a, x[i+ 8], 20,  1163531501);
    a = md5_gg(a, b, c, d, x[i+13], 5 , -1444681467);
    d = md5_gg(d, a, b, c, x[i+ 2], 9 , -51403784);
    c = md5_gg(c, d, a, b, x[i+ 7], 14,  1735328473);
    b = md5_gg(b, c, d, a, x[i+12], 20, -1926607734);

    a = md5_hh(a, b, c, d, x[i+ 5], 4 , -378558);
    d = md5_hh(d, a, b, c, x[i+ 8], 11, -2022574463);
    c = md5_hh(c, d, a, b, x[i+11], 16,  1839030562);
    b = md5_hh(b, c, d, a, x[i+14], 23, -35309556);
    a = md5_hh(a, b, c, d, x[i+ 1], 4 , -1530992060);
    d = md5_hh(d, a, b, c, x[i+ 4], 11,  1272893353);
    c = md5_hh(c, d, a, b, x[i+ 7], 16, -155497632);
    b = md5_hh(b, c, d, a, x[i+10], 23, -1094730640);
    a = md5_hh(a, b, c, d, x[i+13], 4 ,  681279174);
    d = md5_hh(d, a, b, c, x[i+ 0], 11, -358537222);
    c = md5_hh(c, d, a, b, x[i+ 3], 16, -722521979);
    b = md5_hh(b, c, d, a, x[i+ 6], 23,  76029189);
    a = md5_hh(a, b, c, d, x[i+ 9], 4 , -640364487);
    d = md5_hh(d, a, b, c, x[i+12], 11, -421815835);
    c = md5_hh(c, d, a, b, x[i+15], 16,  530742520);
    b = md5_hh(b, c, d, a, x[i+ 2], 23, -995338651);

    a = md5_ii(a, b, c, d, x[i+ 0], 6 , -198630844);
    d = md5_ii(d, a, b, c, x[i+ 7], 10,  1126891415);
    c = md5_ii(c, d, a, b, x[i+14], 15, -1416354905);
    b = md5_ii(b, c, d, a, x[i+ 5], 21, -57434055);
    a = md5_ii(a, b, c, d, x[i+12], 6 ,  1700485571);
    d = md5_ii(d, a, b, c, x[i+ 3], 10, -1894986606);
    c = md5_ii(c, d, a, b, x[i+10], 15, -1051523);
    b = md5_ii(b, c, d, a, x[i+ 1], 21, -2054922799);
    a = md5_ii(a, b, c, d, x[i+ 8], 6 ,  1873313359);
    d = md5_ii(d, a, b, c, x[i+15], 10, -30611744);
    c = md5_ii(c, d, a, b, x[i+ 6], 15, -1560198380);
    b = md5_ii(b, c, d, a, x[i+13], 21,  1309151649);
    a = md5_ii(a, b, c, d, x[i+ 4], 6 , -145523070);
    d = md5_ii(d, a, b, c, x[i+11], 10, -1120210379);
    c = md5_ii(c, d, a, b, x[i+ 2], 15,  718787259);
    b = md5_ii(b, c, d, a, x[i+ 9], 21, -343485551);

    a = safe_add(a, olda);
    b = safe_add(b, oldb);
    c = safe_add(c, oldc);
    d = safe_add(d, oldd);
  }
  return Array(a, b, c, d);

}

/*
 * These functions implement the four basic operations the algorithm uses.
 */
function md5_cmn(q, a, b, x, s, t)
{
  return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s),b);
}
function md5_ff(a, b, c, d, x, s, t)
{
  return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);
}
function md5_gg(a, b, c, d, x, s, t)
{
  return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);
}
function md5_hh(a, b, c, d, x, s, t)
{
  return md5_cmn(b ^ c ^ d, a, b, x, s, t);
}
function md5_ii(a, b, c, d, x, s, t)
{
  return md5_cmn(c ^ (b | (~d)), a, b, x, s, t);
}

/*
 * Calculate the HMAC-MD5, of a key and some data
 */
function core_hmac_md5(key, data)
{
  var bkey = str2binl(key);
  if(bkey.length > 16) bkey = core_md5(bkey, key.length * chrsz);

  var ipad = Array(16), opad = Array(16);
  for(var i = 0; i < 16; i++)
  {
    ipad[i] = bkey[i] ^ 0x36363636;
    opad[i] = bkey[i] ^ 0x5C5C5C5C;
  }

  var hash = core_md5(ipad.concat(str2binl(data)), 512 + data.length * chrsz);
  return core_md5(opad.concat(hash), 512 + 128);
}

/*
 * Add integers, wrapping at 2^32. This uses 16-bit operations internally
 * to work around bugs in some JS interpreters.
 */
function safe_add(x, y)
{
  var lsw = (x & 0xFFFF) + (y & 0xFFFF);
  var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
  return (msw << 16) | (lsw & 0xFFFF);
}

/*
 * Bitwise rotate a 32-bit number to the left.
 */
function bit_rol(num, cnt)
{
  return (num << cnt) | (num >>> (32 - cnt));
}

/*
 * Convert a string to an array of little-endian words
 * If chrsz is ASCII, characters >255 have their hi-byte silently ignored.
 */
function str2binl(str)
{
  var bin = Array();
  var mask = (1 << chrsz) - 1;
  for(var i = 0; i < str.length * chrsz; i += chrsz)
    bin[i>>5] |= (str.charCodeAt(i / chrsz) & mask) << (i%32);
  return bin;
}

/*
 * Convert an array of little-endian words to a string
 */
function binl2str(bin)
{
  var str = "";
  var mask = (1 << chrsz) - 1;
  for(var i = 0; i < bin.length * 32; i += chrsz)
    str += String.fromCharCode((bin[i>>5] >>> (i % 32)) & mask);
  return str;
}

/*
 * Convert an array of little-endian words to a hex string.
 */
function binl2hex(binarray)
{
  var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
  var str = "";
  for(var i = 0; i < binarray.length * 4; i++)
  {
    str += hex_tab.charAt((binarray[i>>2] >> ((i%4)*8+4)) & 0xF) +
           hex_tab.charAt((binarray[i>>2] >> ((i%4)*8  )) & 0xF);
  }
  return str;
}

/*
 * Convert an array of little-endian words to a base-64 string
 */
function binl2b64(binarray)
{
  var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  var str = "";
  for(var i = 0; i < binarray.length * 4; i += 3)
  {
    var triplet = (((binarray[i   >> 2] >> 8 * ( i   %4)) & 0xFF) << 16)
                | (((binarray[i+1 >> 2] >> 8 * ((i+1)%4)) & 0xFF) << 8 )
                |  ((binarray[i+2 >> 2] >> 8 * ((i+2)%4)) & 0xFF);
    for(var j = 0; j < 4; j++)
    {
      if(i * 8 + j * 6 > binarray.length * 32) str += b64pad;
      else str += tab.charAt((triplet >> 6*(3-j)) & 0x3F);
    }
  }
  return str;
}