/*
 * AJAX-based intelligent login interface
 */

/*
 * FRONTEND
 */

/**
 * Performs a logon as a regular member.
 */

window.ajaxLogonToMember = function()
{
	// IE <6 pseudo-compatibility
	if ( KILL_SWITCH )
		return true;
	if ( auth_level >= USER_LEVEL_MEMBER )
		return true;
	ajaxLoginInit(function(k)
		{
			if ( on_main_page && main_page_members != physical_title )
			{
				window.location = makeUrl(main_page_members);
			}
			else
			{
				window.location.reload();
			}
		}, USER_LEVEL_MEMBER);
}

/**
 * Authenticates to the highest level the current user is allowed to go to.
 */

window.ajaxLogonToElev = function()
{
	if ( auth_level == user_level )
		return true;
	
	ajaxLoginInit(function(k)
		{
			ENANO_SID = k;
			var url = String(' ' + window.location).substr(1);
			url = append_sid(url);
			window.location = url;
		}, user_level);
}

/*
 * BACKEND
 */

/**
 * Holding object for various AJAX authentication information.
 * @var object
 */

var logindata = {};

/**
 * Path to the image used to indicate loading progress
 * @var string
 */

if ( !ajax_login_loadimg_path )
	var ajax_login_loadimg_path = false;

if ( !ajax_login_successimg_path )
	var ajax_login_successimg_path = false;

if ( !ajax_login_lockimg_path )
	var ajax_login_lockimg_path = false;

/**
 * Status variables
 * @var int
 */

var AJAX_STATUS_LOADING_KEY = 1;
var AJAX_STATUS_GENERATING_KEY = 2;
var AJAX_STATUS_LOGGING_IN = 3;
var AJAX_STATUS_SUCCESS = 4;
var AJAX_STATUS_ERROR = 5;
var AJAX_STATUS_DESTROY = 65535;

/**
 * State constants
 * @var int
 */

var AJAX_STATE_EARLY_INIT = 1;
var AJAX_STATE_LOADING_KEY = 2;

/**
 * Switch to decide if DiffieHellman shows a "browser incompatible" error
 * @var bool
 */

var ajax_login_prevent_dh = ( IE && !IE_8 ) || ( is_iPhone && !is_iPhone_3 );

/**
 * Time to wait to focus the controls.
 * @var int
 */

var AJAX_LOGIN_FOCUS_WAIT = aclDisableTransitionFX ? 0 : 750;

/**
 * Performs the AJAX request to get an encryption key and from there spawns the login form.
 * @param function The function that will be called once authentication completes successfully.
 * @param int The security level to authenticate at - see http://docs.enanocms.org/Help:Appendix_B
 */

window.ajaxLoginInit = function(call_on_finish, user_level)
{
	load_component(['messagebox', 'flyin', 'fadefilter', 'jquery', 'jquery-ui', 'l10n', 'crypto']);
	
	logindata = {};
	
	var title = ( user_level > USER_LEVEL_MEMBER ) ? $lang.get('user_login_ajax_prompt_title_elev') : $lang.get('user_login_ajax_prompt_title');
	logindata.mb_object = new MessageBox(MB_OKCANCEL | MB_ICONLOCK, title, '');
	
	//
	// Cancel function: called when the "Cancel" button is clicked
	//
	logindata.mb_object.onclick['Cancel'] = function()
	{
		// Hide the error message, if any
		$('#ajax_login_error_box').remove();
		// Hide the captcha, if any
		if ( document.getElementById('autoCaptcha') )
		{
			var to = fly_out_top(document.getElementById('autoCaptcha'), false, true);
			setTimeout(function() {
					var d = document.getElementById('autoCaptcha');
					d.parentNode.removeChild(d);
				}, to);
		}
		// Ask the server to delete the encryption key we're using
		ajaxLoginPerformRequest({
				mode: 'clean_key',
				key_aes: logindata.key_aes,
				key_dh: logindata.key_dh
		});
	};
	
	// Clicking OK will not cause the box to destroy, as this function returns true.
	logindata.mb_object.onbeforeclick['OK'] = function()
	{
		// Just call the submitter and let it take care of everything
		ajaxLoginSubmitForm();
		return true;
	}
	
	// Fetch the inner content area
	logindata.mb_inner = document.getElementById('messageBox').getElementsByTagName('div')[0];
	
	// Initialize state
	logindata.showing_status = false;
	logindata.user_level = user_level;
	logindata.successfunc = call_on_finish;
	logindata.start_time = (new Date()).getTime();
	
	// Build the "loading" window
	ajaxLoginSetStatus(AJAX_STATUS_LOADING_KEY);
	
	// Request the key
	ajaxLoginPerformRequest({ mode: 'getkey' });
}

/**
 * For compatibility only. Really, folks, it's ajaxLoginInit. If you need a
 * mnemonic device, use "two 'in's."
 */

window.ajaxLogonInit = function(call_on_finish, user_level)
{
	return ajaxLoginInit(call_on_finish, user_level);
}

/**
 * Sets the contents of the AJAX login window to the appropriate status message.
 * @param int One of AJAX_STATUS_* constants
 */

window.ajaxLoginSetStatus = function(status)
{
	if ( !logindata.mb_inner )
		return false;
	if ( logindata.showing_status )
	{
		var div = document.getElementById('ajax_login_status');
		if ( div )
			logindata.mb_inner.removeChild(div);
	}
	switch(status)
	{
		case AJAX_STATUS_LOADING_KEY:
			
			// Create the status div
			var div = document.createElement('div');
			div.id = 'ajax_login_status';
			div.style.marginTop = '10px';
			div.style.textAlign = 'center';
			
			// The circly ball ajaxy image + status message
			var status_msg = $lang.get('user_login_ajax_fetching_key');
			
			// Insert the status message
			div.appendChild(document.createTextNode(status_msg));
			
			// Append a br or two to space things properly
			div.appendChild(document.createElement('br'));
			div.appendChild(document.createElement('br'));
			
			var img = document.createElement('img');
			img.src = ( ajax_login_loadimg_path ) ? ajax_login_loadimg_path : scriptPath + '/images/loading-big.gif';
			div.appendChild(img);
			
			// Another coupla brs
			div.appendChild(document.createElement('br'));
			div.appendChild(document.createElement('br'));
			
			// The link to the full login form
			var small = document.createElement('small');
			small.innerHTML = $lang.get('user_login_ajax_link_fullform', { link_full_form: makeUrlNS('Special', 'Login/' + title) });
			div.appendChild(small);
			
			// Insert the entire message into the login window
			logindata.mb_inner.innerHTML = '';
			logindata.mb_inner.appendChild(div);
			
			break;
		case AJAX_STATUS_GENERATING_KEY:
			
			// Create the status div
			var div = document.createElement('div');
			div.id = 'ajax_login_status';
			div.style.marginTop = '10px';
			div.style.textAlign = 'center';
			
			// The circly ball ajaxy image + status message
			var status_msg = $lang.get('user_login_ajax_generating_key');
			
			// Insert the status message
			div.appendChild(document.createTextNode(status_msg));
			
			// Append a br or two to space things properly
			div.appendChild(document.createElement('br'));
			div.appendChild(document.createElement('br'));
			
			var img = document.createElement('img');
			img.src = ( ajax_login_lockimg_path ) ? ajax_login_lockimg_path : scriptPath + '/images/lock48.png';
			div.appendChild(img);
			
			// Another coupla brs
			div.appendChild(document.createElement('br'));
			div.appendChild(document.createElement('br'));
			
			// The link to the full login form
			var small = document.createElement('small');
			small.innerHTML = $lang.get('user_login_ajax_link_fullform_dh', { link_full_form: makeUrlNS('Special', 'Login/' + title) });
			div.appendChild(small);
			
			// Insert the entire message into the login window
			logindata.mb_inner.innerHTML = '';
			logindata.mb_inner.appendChild(div);
			
			break;
		case AJAX_STATUS_LOGGING_IN:
			
			// Create the status div
			var div = document.createElement('div');
			div.id = 'ajax_login_status';
			div.style.marginTop = '10px';
			div.style.textAlign = 'center';
			
			// The circly ball ajaxy image + status message
			var status_msg = $lang.get('user_login_ajax_loggingin');
			
			// Insert the status message
			div.appendChild(document.createTextNode(status_msg));
			
			// Append a br or two to space things properly
			div.appendChild(document.createElement('br'));
			div.appendChild(document.createElement('br'));
			
			var img = document.createElement('img');
			img.src = ( ajax_login_loadimg_path ) ? ajax_login_loadimg_path : scriptPath + '/images/loading-big.gif';
			div.appendChild(img);
			
			// Insert the entire message into the login window
			logindata.mb_inner.innerHTML = '';
			logindata.mb_inner.appendChild(div);
			
			break;
		case AJAX_STATUS_SUCCESS:
			
			// Create the status div
			var div = document.createElement('div');
			div.id = 'ajax_login_status';
			div.style.marginTop = '10px';
			div.style.textAlign = 'center';
			
			// The circly ball ajaxy image + status message
			var status_msg = $lang.get('user_login_success_short');
			
			// Insert the status message
			div.appendChild(document.createTextNode(status_msg));
			
			// Append a br or two to space things properly
			div.appendChild(document.createElement('br'));
			div.appendChild(document.createElement('br'));
			
			var img = document.createElement('img');
			img.src = ( ajax_login_successimg_path ) ? ajax_login_successimg_path : scriptPath + '/images/check.png';
			div.appendChild(img);
			
			// Insert the entire message into the login window
			logindata.mb_inner.innerHTML = '';
			logindata.mb_inner.appendChild(div);
			
			break;
			
		case AJAX_STATUS_ERROR:
			// Create the status div
			var div = document.createElement('div');
			div.id = 'ajax_login_status';
			div.style.marginTop = '10px';
			div.style.textAlign = 'center';
			
			// The circly ball ajaxy image + status message
			var status_msg = $lang.get('user_login_ajax_err_crypto');
			
			// Insert the status message
			div.appendChild(document.createTextNode(status_msg));
			
			// Append a br or two to space things properly
			div.appendChild(document.createElement('br'));
			div.appendChild(document.createElement('br'));
			
			var img = document.createElement('img');
			img.src = ( ajax_login_successimg_path ) ? ajax_login_successimg_path : scriptPath + '/images/checkbad.png';
			div.appendChild(img);
			
			// Append a br or two to space things properly
			div.appendChild(document.createElement('br'));
			div.appendChild(document.createElement('br'));
			
			// The circly ball ajaxy image + status message
			var detail_msg = $lang.get('user_login_ajax_err_crypto_details');
			var full_link = $lang.get('user_login_ajax_err_crypto_link');
			var link = document.createElement('a');
			link.href = makeUrlNS('Special', 'Login/' + title, 'level=' + logindata.user_level, true);
			link.appendChild(document.createTextNode(full_link));
			var span = document.createElement('span');
			span.style.fontSize = 'smaller';
			
			// Insert the message
			span.appendChild(document.createTextNode(detail_msg + ' '));
			span.appendChild(link);
			div.appendChild(span);
			
			// Insert the entire message into the login window
			logindata.mb_inner.innerHTML = '';
			logindata.mb_inner.appendChild(div);
			
			break;
			
		default:
			eval(setHook('login_set_status'));
			break;
			
		case AJAX_STATUS_DESTROY:
		case null:
		case undefined:
			logindata.showing_status = false;
			return;
			break;
	}
	logindata.showing_status = true;
}

/**
 * Performs an AJAX logon request to the server and calls ajaxLoginProcessResponse() on the result.
 * @param object JSON packet to send
 * @param function Optional function to call on the response as well.
 */

window.ajaxLoginPerformRequest = function(json, _hookfunc)
{
	json = toJSONString(json);
	json = ajaxEscape(json);
	var hookfunc = typeof(_hookfunc) == 'function' ? _hookfunc : false;
	ajaxPost(makeUrlNS('Special', 'Login/action.json'), 'r=' + json, function(ajax)
		{
			if ( ajax.readyState == 4 && ajax.status == 200 )
			{
				// parse response
				var response = String(ajax.responseText + '');
				if ( !check_json_response(response) )
				{
					handle_invalid_json(response);
					return false;
				}
				response = parseJSON(response);
				ajaxLoginProcessResponse(response, hookfunc);
			}
		}, true);
}

/**
 * Processes a response from the login server
 * @param object JSON response
 */

window.ajaxLoginProcessResponse = function(response, hookfunc)
{
	// Did the server send a plaintext error?
	if ( response.mode == 'error' )
	{
		if ( logindata.mb_object )
		{
			logindata.mb_object.destroy();
			var error_msg = $lang.get('user_' + ( response.error.toLowerCase() ));
			new MessageBox(MB_ICONSTOP | MB_OK, $lang.get('user_err_login_generic_title'), error_msg);
		}
		else
		{
			alert(response.error);
		}
		return false;
	}
	
	// Main mode switch
	switch ( response.mode )
	{
		case 'initial':
			// Rid ourselves of any loading windows
			ajaxLoginSetStatus(AJAX_STATUS_DESTROY);
			// show any errors
			ajaxLoginShowFriendlyError(response);
			// The server wants us to build the login form, all the information is there
			ajaxLoginBuildForm(response);
			break;
		case 'login_success':
			ajaxLoginSetStatus(AJAX_STATUS_SUCCESS);
			logindata.successfunc(response.key, response);
			break;
		case 'reset_pass_used':
			// We logged in with a temporary password. Prompt the user to go to the temp password page and
			// reset their real password. If they click no, treat it as a login failure, as no session key
			// is actually issued when this type of login is performed.
			
			var conf = confirm($lang.get('user_login_ajax_msg_used_temp_pass'));
			if ( conf )
			{
				var url = makeUrlNS('Special', 'PasswordReset/stage2/' + response.user_id + '/' + response.temp_password);
				window.location = url;
				break;
			}
			// else, treat as a failure
		default:
			// Rid ourselves of any loading windows
			ajaxLoginSetStatus(AJAX_STATUS_DESTROY);
			document.getElementById('messageBox').style.backgroundColor = '#C0C0C0';
			var mb_parent = document.getElementById('messageBox').parentNode;
			$(mb_parent).effect("shake", {}, 200);
			setTimeout(function()
				{
					document.getElementById('messageBox').style.backgroundColor = '#FFF';
					console.debug(response);
					ajaxLoginShowFriendlyError(response);
					ajaxLoginBuildForm(response);
				}, 2500);
			
			break;
		case 'logout_success':
			if ( ENANO_SID )
			{
				ajaxLoginReplaceSIDInline(false, ENANO_SID, USER_LEVEL_MEMBER);
			}
			break;
		case 'noop':
			break;
	}
	if ( hookfunc )
	{
		hookfunc(response);
	}
}

/*
 * RESPONSE HANDLERS
 */

/**
 * Builds the login form.
 * @param object Metadata to build off of
 */

window.ajaxLoginBuildForm = function(data)
{
	// let's hope this effectively preloads the image...
	var _1 = document.createElement('img');
	_1.src = ( ajax_login_successimg_path ) ? ajax_login_successimg_path : scriptPath + '/images/check.png';
	var _2 = document.createElement('img');
	_2.src = ( ajax_login_lockimg_path ) ? ajax_login_lockimg_path : scriptPath + '/images/lock48.png';
	
	var div = document.createElement('div');
	div.id = 'ajax_login_form';
	
	var show_captcha = ( data.lockout.active && data.lockout.policy == 'captcha' ) ? data.lockout.captcha : false;
	
	// text displayed on re-auth
	if ( logindata.user_level > USER_LEVEL_MEMBER )
	{
		div.innerHTML += $lang.get('user_login_ajax_prompt_body_elev') + '<br /><br />';
	}
	
	// Create the form
	var form = document.createElement('form');
	form.action = 'javascript:void(ajaxLoginSubmitForm());';
	form.onsubmit = function()
	{
		ajaxLoginSubmitForm();
		return false;
	}
	if ( IE )
	{
		form.style.marginTop = '-20px';
	}
	
	// Using tables to wrap form elements because it results in a
	// more visually appealing form. Yes, tables suck. I don't really
	// care - they make forms look good.
	
	var table = document.createElement('table');
	table.style.margin = '0 auto';
	
	// Field - username
	var tr1 = document.createElement('tr');
	var td1_1 = document.createElement('td');
	td1_1.appendChild(document.createTextNode($lang.get('user_login_field_username') + ':'));
	tr1.appendChild(td1_1);
	var td1_2 = document.createElement('td');
	var f_username = document.createElement('input');
	f_username.id = 'ajax_login_field_username';
	f_username.name = 'ajax_login_field_username';
	f_username.type = 'text';
	f_username.size = '25';
	if ( data.username )
		f_username.value = data.username;
	td1_2.appendChild(f_username);
	tr1.appendChild(td1_2);
	table.appendChild(tr1);
	
	// Field - password
	var tr2 = document.createElement('tr');
	var td2_1 = document.createElement('td');
	td2_1.appendChild(document.createTextNode($lang.get('user_login_field_password') + ':'));
	tr2.appendChild(td2_1);
	var td2_2 = document.createElement('td');
	var f_password = document.createElement('input');
	f_password.id = 'ajax_login_field_password';
	f_password.name = 'ajax_login_field_username';
	f_password.type = 'password';
	f_password.size = '25';
	if ( !show_captcha )
	{
		f_password.onkeyup = function(e)
		{
			if ( !e )
				e = window.event;
			if ( !e && IE )
				return true;
			if ( e.keyCode == 13 )
			{
				ajaxLoginSubmitForm();
			}
		}
	}
	td2_2.appendChild(f_password);
	tr2.appendChild(td2_2);
	table.appendChild(tr2);
	
	// Field - captcha
	if ( show_captcha )
	{
		var tr3 = document.createElement('tr');
		var td3_1 = document.createElement('td');
		td3_1.appendChild(document.createTextNode($lang.get('user_login_field_captcha') + ':'));
		tr3.appendChild(td3_1);
		var td3_2 = document.createElement('td');
		var f_captcha = document.createElement('input');
		f_captcha.id = 'ajax_login_field_captcha';
		f_captcha.name = 'ajax_login_field_username';
		f_captcha.type = 'text';
		f_captcha.size = '25';
		f_captcha.onkeyup = function(e)
		{
			if ( !e )
				e = window.event;
			if ( !e.keyCode )
				return true;
			if ( e.keyCode == 13 )
			{
				ajaxLoginSubmitForm();
			}
		}
		td3_2.appendChild(f_captcha);
		tr3.appendChild(td3_2);
		table.appendChild(tr3);
	}
	
	// ok, this is a compatibility hack
	data.locked_out = { locked_out: data.lockout.active };
	
	// hook for the login form
	eval(setHook('login_build_form'));
	
	delete(data.locked_out);
	
	// Done building the main part of the form
	form.appendChild(table);
	
	// Checkbox container
	var boxen = document.createElement('div');
	boxen.style.textAlign = 'center';
	boxen.style.padding = '7px 0';
	
	// Field: remember login
	if ( logindata.user_level <= USER_LEVEL_MEMBER )
	{
		var lbl_remember = document.createElement('label');
		lbl_remember.style.fontSize = 'smaller';
		lbl_remember.style.textAlign = 'center';
		
		// figure out what text to put in the "remember me" checkbox
		// infinite session length?
		if ( data.extended_time == 0 )
		{
			// yes, infinite
			var txt_remember = $lang.get('user_login_ajax_check_remember_infinite');
		}
		else
		{
			if ( data.extended_time % 7 == 0 )
			{
				// number of days is a multiple of 7
				// use weeks as our unit
				var sess_time = data.extended_time / 7;
				var unit = 'week';
			}
			else
			{
				// use days as our unit
				var sess_time = data.extended_time;
				var unit = 'day';
			}
			// more than one week or day?
			if ( sess_time != 1 )
				unit += 's';
			
			// assemble the string
			var txt_remember = $lang.get('user_login_ajax_check_remember', {
					session_length: sess_time,
					length_units: $lang.get('etc_unit_' + unit)
				});
		}
		var check_remember = document.createElement('input');
		check_remember.type = 'checkbox';
		// this onclick attribute changes the cookie whenever the checkbox or label is clicked
		check_remember.setAttribute('onclick', 'var ck = ( this.checked ) ? "enable" : "disable"; createCookie("login_remember", ck, 3650);');
		if ( readCookie('login_remember') != 'disable' )
			check_remember.setAttribute('checked', 'checked');
		check_remember.id = 'ajax_login_field_remember';
		lbl_remember.appendChild(check_remember);
		lbl_remember.innerHTML += ' ' + txt_remember;
		
		boxen.appendChild(lbl_remember);
	}
	
	var bullet = document.createElement('span');
	bullet.innerHTML = '&nbsp;';
	bullet.style.fontSize = '12pt';
	bullet.style.borderRight = '1px solid #aaa';
	bullet.style.margin = '0 6px 0 4px';
	
	// Field: enable Diffie Hellman
	if ( ajax_login_prevent_dh )
	{
		if ( logindata.user_level <= USER_LEVEL_MEMBER )
			// only show this if both checkboxes are visible
			boxen.appendChild(bullet);
			
		var lbl_dh = document.createElement('span');
		lbl_dh.style.fontSize = 'smaller';
		lbl_dh.style.textAlign = 'center';
		lbl_dh.innerHTML = $lang.get('user_login_ajax_check_dh_ie');
		boxen.appendChild(lbl_dh);
	}
	else if ( !data.crypto.dh_enable )
	{
		// create hidden control - server requested that DiffieHellman be disabled (usually means not supported)
		var check_dh = document.createElement('input');
		check_dh.type = 'hidden';
		check_dh.id = 'ajax_login_field_dh';
		boxen.appendChild(check_dh);
	}
	else
	{
		if ( logindata.user_level <= USER_LEVEL_MEMBER )
			// only show this if both checkboxes are visible
			boxen.appendChild(bullet);
		
		var lbl_dh = document.createElement('label');
		lbl_dh.style.fontSize = 'smaller';
		lbl_dh.style.textAlign = 'center';
		var check_dh = document.createElement('input');
		check_dh.type = 'checkbox';
		// this onclick attribute changes the cookie whenever the checkbox or label is clicked
		check_dh.setAttribute('onclick', 'var ck = ( this.checked ) ? "enable" : "disable"; createCookie("diffiehellman_login", ck, 3650);');
		if ( readCookie('diffiehellman_login') != 'disable' )
			check_dh.setAttribute('checked', 'checked');
		check_dh.id = 'ajax_login_field_dh';
		lbl_dh.appendChild(check_dh);
		lbl_dh.innerHTML += ' ' + $lang.get('user_login_ajax_check_dh');
		boxen.appendChild(lbl_dh);
	}
	
	form.appendChild(boxen);
	
	if ( IE )
	{
		div.innerHTML += form.outerHTML;
	}
	else
	{
		div.appendChild(form);
	}
	
	// Diagnostic / help links
	// (only displayed in login, not in re-auth)
	if ( logindata.user_level == USER_LEVEL_MEMBER )
	{
		var links = document.createElement('small');
		links.style.display = 'block';
		links.style.textAlign = 'center';
		links.innerHTML = '';
		if ( !show_captcha )
			links.innerHTML += $lang.get('user_login_ajax_link_fullform', { link_full_form: makeUrlNS('Special', 'Login/' + title) }) + ' &bull; ';
		// Always shown
		links.innerHTML += $lang.get('user_login_ajax_link_forgotpass', { forgotpass_link: makeUrlNS('Special', 'PasswordReset') }) + ' &bull; ';
		if ( !show_captcha )
			links.innerHTML += $lang.get('user_login_ajax_createaccount_blurb', { reg_link: makeUrlNS('Special', 'Register') });
		div.appendChild(links);
	}
	
	// Insert the entire form into the login window
	logindata.mb_inner.innerHTML = '';
	logindata.mb_inner.appendChild(div);
	
	// Post operations: field focus
	var wait_time = AJAX_LOGIN_FOCUS_WAIT - ((new Date()).getTime() - logindata.start_time);
	wait_time = Math.max(0, wait_time);
	setTimeout(
		function()
		{
			if ( logindata.loggedin_username )
				document.getElementById('ajax_login_field_password').focus();
			else
				document.getElementById('ajax_login_field_username').focus();
		}, wait_time);
	
	// Post operations: show captcha window
	if ( show_captcha )
	{
		ajaxShowCaptcha(show_captcha);
	}
	
	// Post operations: stash encryption keys and All That Jazz(TM)
	logindata.key_aes = data.crypto.aes_key;
	logindata.key_dh = data.crypto.dh_public_key;
	logindata.captcha_hash = show_captcha;
	logindata.loggedin_username = data.username;
	
	// If policy is lockout, also disable controls
	if ( data.lockout.policy == 'lockout' && data.lockout.active )
	{
		f_username.setAttribute('disabled', 'disabled');
		f_password.setAttribute('disabled', 'disabled');
	}
}

window.ajaxLoginSubmitForm = function(real, username, password, captcha, remember)
{
	// Perform AES test to make sure it's all working
	if ( !aes_self_test() )
	{
		alert('BUG: AES self-test failed');
		login_cache.mb_object.destroy();
		return false;
	}
	// Hide the error message and captcha
	if ( document.getElementById('ajax_login_error_box') )
	{
		document.getElementById('ajax_login_error_box').parentNode.removeChild(document.getElementById('ajax_login_error_box'));
	}
	if ( document.getElementById('autoCaptcha') )
	{
		var to = fly_out_top(document.getElementById('autoCaptcha'), false, true);
		setTimeout(function() {
				var d = document.getElementById('autoCaptcha');
				d.parentNode.removeChild(d);
			}, to);
	}
	// "Remember session" switch
	if ( typeof(remember) == 'boolean' )
	{
		var remember_session = remember;
	}
	else
	{
		if ( document.getElementById('ajax_login_field_remember') )
		{
			var remember_session = ( document.getElementById('ajax_login_field_remember').checked ) ? true : false;
		}
		else
		{
			var remember_session = false;
		}
	}
	// Encryption: preprocessor
	if ( real )
	{
		var do_dh = true;
	}
	else if ( document.getElementById('ajax_login_field_dh') )
	{
		var do_dh = document.getElementById('ajax_login_field_dh').checked;
	}
	else
	{
		if ( ajax_login_prevent_dh )
		{
			// IE/MobileSafari doesn't have this control, continue silently IF the rest
			// of the login form is there
			if ( !document.getElementById('ajax_login_field_username') )
			{
				return false;
			}
		}
		else
		{
			// The user probably clicked ok when the form wasn't in there.
			return false;
		}
	}
	
	if ( typeof(username) != 'string' )
	{
		var username = document.getElementById('ajax_login_field_username').value;
	}
	if ( typeof(password) != 'string' )
	{
		var password = document.getElementById('ajax_login_field_password').value;
	}
	if ( !captcha && document.getElementById('ajax_login_field_captcha') )
	{
		var captcha = document.getElementById('ajax_login_field_captcha').value;
	}
	
	// Only run early submit hook once
	if ( !window.logindata.early_submit_run )
		eval(setHook('login_submit_early'));
	
	window.logindata.early_submit_run = true;
	
	try
	{
	
	if ( do_dh )
	{
		ajaxLoginSetStatus(AJAX_STATUS_GENERATING_KEY);
		if ( !real )
		{
			// Wait while the browser updates the login window
			setTimeout(function()
				{
					ajaxLoginSubmitForm(true, username, password, captcha, remember_session);
				}, 20);
			return true;
		}
		var dh_start = (new Date()).getTime();
		// Perform Diffie Hellman stuff
		var dh_priv = dh_gen_private();
		var dh_pub = dh_gen_public(dh_priv);
		var secret = dh_gen_shared_secret(dh_priv, logindata.key_dh);
		// secret_hash is used to verify that the server guesses the correct secret
		var secret_hash = hex_sha1(secret);
		// crypt_key is the actual AES key
		var crypt_key = (hex_sha256(secret)).substr(0, (keySizeInBits / 4));
		var dh_time = (new Date()).getTime() - dh_start;
		console.debug("DH: complete, time = %dms", dh_time);
	}
	else
	{
		var crypt_key = logindata.key_aes;
	}
	
	ajaxLoginSetStatus(AJAX_STATUS_LOGGING_IN);
	
	// Encrypt the password and username
	var userinfo = {
			username: username,
			password: password
		};
		
	eval(setHook('login_build_userinfo'));
		
	userinfo = toJSONString(userinfo);
	var crypt_key_ba = hexToByteArray(crypt_key);
	userinfo = stringToByteArray(userinfo);
	
	userinfo = rijndaelEncrypt(userinfo, crypt_key_ba, 'ECB');
	userinfo = byteArrayToHex(userinfo);
	// Encrypted username and password (serialized with JSON) are now in the userinfo string
	
	// Collect other needed information
	if ( logindata.captcha_hash )
	{
		var captcha_hash = logindata.captcha_hash;
		var captcha_code = captcha;
	}
	else
	{
		var captcha_hash = false;
		var captcha_code = false;
	}
	
	// Ship it across the 'net
	if ( do_dh )
	{
		var json_packet = {
			mode: 'login_dh',
			userinfo: userinfo,
			captcha_code: captcha_code,
			captcha_hash: captcha_hash,
			dh_public_key: logindata.key_dh,
			dh_client_key: dh_pub,
			dh_secret_hash: secret_hash,
			level: logindata.user_level,
			remember: remember_session
		}
	}
	else
	{
		var json_packet = {
			mode: 'login_aes',
			userinfo: userinfo,
			captcha_code: captcha_code,
			captcha_hash: captcha_hash,
			key_aes: hex_md5(crypt_key),
			level: logindata.user_level,
			remember: remember_session
		}
	}
	}
	catch(e)
	{
		ajaxLoginSetStatus(AJAX_STATUS_ERROR);
		console.error('Exception caught in login process; backtrace follows');
		console.debug(e);
		return false;
	}
	// reset this...
	window.logindata.early_submit_run = false;
	ajaxLoginPerformRequest(json_packet);
}

window.ajaxLoginShowFriendlyError = function(response)
{
	eval(setHook('ajax_login_process_error'));
	var text = ajaxLoginGetErrorText(response);
	if ( text == false )
		return true;
		
	if ( document.getElementById('ajax_login_error_box') )
	{
		// console.info('Reusing existing error-box');
		document.getElementById('ajax_login_error_box').innerHTML = text;
		return true;
	}
	
	// console.info('Drawing new error-box');
	
	// calculate position for the top of the box
	var mb_bottom = $dynano('messageBoxButtons').Top() + $dynano('messageBoxButtons').Height();
	// if the box isn't done flying in yet, just estimate
	if ( mb_bottom < ( getHeight() / 2 ) )
	{
		mb_bottom = ( getHeight() / 2 ) + 120;
	}
	var win_bottom = getHeight() + getScrollOffset();
	var top = mb_bottom + ( ( win_bottom - mb_bottom ) / 2 ) - 32;
	// left position = 0.2 * window_width, seeing as the box is 60% width this works hackishly but nice and quick
	var left = getWidth() * 0.2;
	
	// create the div
	var errbox = document.createElement('div');
	errbox.className = 'error-box-mini';
	errbox.style.position = 'absolute';
	errbox.style.width = '60%';
	errbox.style.top = top + 'px';
	errbox.style.left = left + 'px';
	errbox.style.zIndex = getHighestZ();
	errbox.innerHTML = text;
	errbox.id = 'ajax_login_error_box';
	
	var body = document.getElementsByTagName('body')[0];
	body.appendChild(errbox);
}

window.ajaxLoginGetErrorText = function(response)
{
	if ( response.lockout )
	{
		// set this pluralality thing
		response.lockout.plural = response.lockout.time_rem == 1 ? '' : $lang.get('meta_plural');
	}
	
	if ( response.mode == 'initial' )
	{
		// Just showing the box for the first time. If there's an error now, it's based on a preexisting lockout.
		if ( response.lockout.active )
		{
			return $lang.get('user_err_locked_out_initial_' + response.lockout.policy, response.lockout);
		}
		return false;
	}
	else
	{
		// An attempt was made.
		switch(response.mode)
		{
			case 'login_failure':
				// Generic login user error.
				var error = '', x;
				if ( (x = $lang.get(response.error)) != response.error || ! (/^[a-z0-9_]+/).test(response.error) )
					error = x;
				else
					error = $lang.get('user_err_' + response.error);
				if ( response.lockout.active && response.lockout.policy == 'lockout' )
				{
					// Lockout enforcement was just activated.
					return $lang.get('user_err_locked_out_initial_' + response.lockout.policy, response.lockout);
				}
				else if ( response.lockout.policy != 'disable' && !response.lockout.active && response.lockout.fails > 0 )
				{
					// Lockout is in a warning state.
					error += ' ' + $lang.get('user_err_invalid_credentials_' + response.lockout.policy, response.lockout);
				}
				return error;
				break;
			case 'api_error':
				// Error in the API.
				return $lang.get('user_err_login_generic_title') + ': ' + $lang.get('user_' + response.error.toLowerCase());
				break;
		}
	}
	
	return typeof(response.error) == 'string' ? response.error : false;
}

window.ajaxShowCaptcha = function(code)
{
	var mydiv = document.createElement('div');
	mydiv.style.backgroundColor = '#FFFFFF';
	mydiv.style.padding = '10px';
	mydiv.style.position = 'absolute';
	mydiv.style.top = '0px';
	mydiv.id = 'autoCaptcha';
	mydiv.style.zIndex = String( getHighestZ() + 1 );
	var img = document.createElement('img');
	img.onload = function()
	{
		if ( this.loaded )
			return true;
		var mydiv = document.getElementById('autoCaptcha');
		var width = getWidth();
		var divw = $dynano(mydiv).Width();
		var left = ( width / 2 ) - ( divw / 2 );
		mydiv.style.left = left + 'px';
		fly_in_top(mydiv, false, true);
		this.loaded = true;
	};
	img.src = makeUrlNS('Special', 'Captcha/' + code);
	img.onclick = function() { this.src = this.src + '/a'; };
	img.style.cursor = 'pointer';
	mydiv.appendChild(img);
	domObjChangeOpac(0, mydiv);
	var body = document.getElementsByTagName('body')[0];
	body.appendChild(mydiv);
}

window.ajaxInitLogout = function()
{
	load_component(['messagebox', 'l10n', 'flyin', 'fadefilter', 'jquery', 'jquery-ui']);
	
	var title = $lang.get('user_logout_confirm_title');
	var message = ( auth_level > USER_LEVEL_MEMBER ) ? $lang.get('user_logout_confirm_body_nelev') : $lang.get('user_logout_confirm_body_normal');
	var buttons = [];
	buttons.push({
			text: $lang.get('user_logout_confirm_btn_logout'),
			color: 'red',
			style: {
				fontWeight: 'bold'
			},
			onclick: function()
			{
				miniPromptDestroy(this);
				window.location = makeUrlNS('Special', 'Logout/' + csrf_token + '/' + window.title);
				return false;
			}
		});
	if ( auth_level > USER_LEVEL_MEMBER )
	{
		buttons.push({
				text: $lang.get('user_logout_confirm_btn_deauth'),
				color: 'blue',
				onclick: function()
				{
					var mp = miniPromptGetParent(this);
					var whitey = whiteOutMiniPrompt(mp);
					
					ajaxLoginPerformRequest({
							mode:  'logout',
							level: auth_level,
							csrf_token: csrf_token
					}, function(response)
						{
							whiteOutReportSuccess(whitey);
						});
					return false;
				}
			});
	}
	buttons.push({
			text: $lang.get('etc_cancel'),
			onclick: function()
			{
				miniPromptDestroy(this);
				return false;
			}
		});
	
	miniPromptMessage({
			title: title,
			message: message,
			buttons: buttons
	});
}

window.mb_logout = function()
{
	ajaxInitLogout();
}

window.ajaxStartLogin = function()
{
	ajaxLogonToMember();
}

window.ajaxStartAdminLogin = function()
{
	// IE <6 pseudo-compatibility
	if ( KILL_SWITCH )
		return true;
	if ( auth_level < USER_LEVEL_ADMIN )
	{
		ajaxLoginInit(function(k) {
			ENANO_SID = k;
			auth_level = USER_LEVEL_ADMIN;
			var loc = makeUrlNS('Special', 'Administration');
			if ( (ENANO_SID + ' ').length > 1 )
				window.location = loc;
		}, USER_LEVEL_ADMIN);
		return false;
	}
	var loc = makeUrlNS('Special', 'Administration');
	window.location = loc;
}

window.ajaxAdminPage = function()
{
	// IE <6 pseudo-compatibility
	if ( KILL_SWITCH )
		return true;
	if ( auth_level < USER_LEVEL_ADMIN )
	{
		ajaxPromptAdminAuth(function(k) {
			ENANO_SID = k;
			auth_level = USER_LEVEL_ADMIN;
			var loc = String(window.location + '');
			window.location = append_sid(loc);
			var loc = makeUrlNS('Special', 'Administration', 'module=' + namespace_list['Admin'] + 'PageManager&source=ajax&page_id=' + ajaxEscape(title));
			if ( (ENANO_SID + ' ').length > 1 )
				window.location = loc;
		}, 9);
		return false;
	}
	var loc = makeUrlNS('Special', 'Administration', 'module=' + namespace_list['Admin'] + 'PageManager&source=ajax&page_id=' + ajaxEscape(title));
	window.location = loc;
}

window.ajaxLoginNavTo = function(namespace, page_id, min_level, get)
{
	// IE <6 pseudo-compatibility
	if ( KILL_SWITCH )
		return true;
	void(namespace);
	void(page_id);
	get = get || false;
	if ( auth_level < min_level )
	{
		ajaxPromptAdminAuth(function(k) {
			ENANO_SID = k;
			auth_level = min_level;
			var loc = makeUrlNS(namespace, page_id, get);
			if ( (ENANO_SID + ' ').length > 1 )
				window.location = loc;
		}, min_level);
		return false;
	}
	var loc = makeUrlNS(namespace, page_id, get);
	window.location = loc;
}

window.ajaxAdminUser = function(username)
{
	// IE <6 pseudo-compatibility
	if ( KILL_SWITCH )
		return true;
	if ( auth_level < USER_LEVEL_ADMIN )
	{
		ajaxPromptAdminAuth(function(k) {
			ENANO_SID = k;
			auth_level = USER_LEVEL_ADMIN;
			var loc = String(window.location + '');
			window.location = append_sid(loc);
			var loc = makeUrlNS('Special', 'Administration', 'module=' + namespace_list['Admin'] + 'UserManager&src=get&user=' + ajaxEscape(username));
			if ( (ENANO_SID + ' ').length > 1 )
				window.location = loc;
		}, 9);
		return false;
	}
	var loc = makeUrlNS('Special', 'Administration', 'module=' + namespace_list['Admin'] + 'UserManager&src=get&user=' + ajaxEscape(username));
	window.location = loc;
}

window.ajaxDynamicReauth = function(adminpage, level)
{
	if ( auth_level < USER_LEVEL_MEMBER )
	{
		ajaxStartLogin();
		return false;
	}
	
	var old_sid = ENANO_SID;
	var targetpage = adminpage;
	if ( !level )
	{
		level = USER_LEVEL_ADMIN;
	}
	
	ajaxLogonInit(function(k, response)
		{
			ajaxLoginReplaceSIDInline(k, old_sid, level);
			window.user_id = response.user_id;
			window.user_level = response.user_level;
			mb_current_obj.destroy();
			if ( typeof(targetpage) == 'string' )
			{
				ajaxPage(targetpage);
			}
			else if ( typeof(targetpage) == 'function' )
			{
				targetpage(k);
			}
		}, level);
	if ( typeof(adminpage) == 'string' )
	{
		ajaxLoginShowFriendlyError({
				error_code: 'admin_session_timed_out',
				respawn_info: {}
		});
	}
}

window.ajaxRenewSession = function()
{
	ajaxDynamicReauth(false);
}

window.ajaxTrashElevSession = function()
{
	load_component(['messagebox', 'fadefilter', 'l10n', 'flyin', 'jquery', 'jquery-ui']);
	miniPromptMessage({
		title: $lang.get('user_logout_confirm_title_elev'),
		message: $lang.get('user_logout_confirm_body_elev'),
		buttons: [
			{
				text: $lang.get('user_logout_confirm_btn_logout'),
				color: 'red',
				style: {
					fontWeight: 'bold'
				},
				onclick: function()
				{
					ajaxLoginPerformRequest({
							mode:  'logout',
							level: auth_level,
							csrf_token: csrf_token
					});
					miniPromptDestroy(this);
				}
			},
			{
				text: $lang.get('etc_cancel'),
				onclick: function()
				{
					miniPromptDestroy(this);
				}
			}
		]
	});
}

/**
 * Take an SID and patch all internal links on the page.
 * @param string New key. If false, removes keys from the page.
 * @param string Old key. If false, only appends the new SID (more work as it uses DOM, use when dynamically going up to elevated)
 * @param int New level, not a huge deal but sets auth_level. Try to specify it as some functions depend on it.
 */

window.ajaxLoginReplaceSIDInline = function(key, oldkey, level)
{
	var host = String(window.location.hostname);
	var exp = new RegExp('^https?://' + host.replace('.', '\.') + contentPath.replace('.', '\.'), 'g');
	var rexp = new RegExp('^https?://' + host.replace('.', '\.'), 'g');
	
	if ( key )
	{
		if ( oldkey )
		{
			var body = document.getElementsByTagName('body')[0];
			var replace = new RegExp(oldkey, 'g');
			body.innerHTML = body.innerHTML.replace(replace, key);
			ENANO_SID = key;
		}
		else
		{
			// append SID to all internal links
			ENANO_SID = key;
			
			var links = document.getElementsByTagName('a');
			for ( var i = 0; i < links.length; i++ )
			{
				if ( links[i].href.match(exp, links[i]) && links[i].href.indexOf('#') == -1 )
				{
					var newurl = (String(append_sid(links[i].href))).replace(rexp, '');
					links[i].href = newurl;
				}
			}
			
			var forms = document.getElementsByTagName('form');
			for ( var i = 0; i < forms.length; i++ )
			{
				if ( forms[i].method.toLowerCase() == 'post' )
				{
					if ( forms[i].action.match(exp, links[i]) )
					{
						var newurl = (String(append_sid(forms[i].action))).replace(rexp, '');
						forms[i].action = newurl;
					}
				}
				else
				{
					if ( !forms[i].auth )
					{
						var auth = document.createElement('input');
						auth.type = 'hidden';
						auth.name = 'auth';
						auth.value = key;
						forms[i].appendChild(auth);
					}
					else
					{
						forms[i].auth.value = key;
					}
				}
			}
		}
		if ( level )
		{
			auth_level = level;
		}
		window.location.hash = '#auth:' + key;
	}
	else
	{
		auth_level = USER_LEVEL_MEMBER;
		ENANO_SID = false;
		if ( oldkey )
		{
			var links = document.getElementsByTagName('a');
			for ( var i = 0; i < links.length; i++ )
			{
				if ( links[i].href.match(exp, links[i]) && links[i].href.indexOf('#') == -1 )
				{
					links[i].href = links[i].href.replace(/\?auth=([a-f0-9]+)(&|#|$)/, '$2').replace(/&auth=([a-f0-9]+)/, '').replace(rexp, '');
				}
			}
		}
		window.location.hash = '#auth:false';
	}
	window.stdAjaxPrefix = append_sid(scriptPath + '/ajax.php?title=' + title);
}