// DCLinabox.js
//
// Core JavaScript for DCLinabox.
//
// Copyright (C) 2011-2024 Mark G Daniel <mark.daniel@wasd.vsm.com.au>
// Based on ShellInABox ... http://shellinabox.com/
// Copyright (C) 2008,2009 Markus Gutschke <markus@shellinabox.com>
//
// 07-OCT-2023  MGD  v1.7.3  changes to paste functionality
// 02-JUL-2021  MGD  v1.7.1  add DCLinboxVisualBell
//                           bugfix; getParameter('DCLinaboxTheme','light');
// 25-JAN-2021  MGD  v1.7.0, virtual keyboard
//                           implemented using KioskBoard
//                           https://furcan.github.io/KioskBoard/
// 06-OCT-2020  MGD  v1.6.0, Allow F1..F12 to be VT220-style function keys
//                           Long Line Editor (LLE)
//                           use 0x2591 not 0x2592 with Safari :-/
// 01-OCT-2016  MGD  v1.5.0  DCLinaboxVMSkeysPC/Mac configuration
//                           login prompt processing
// 18-JUL-2016  MGD  v1.4.0, support DEC SHDW, DHDW, DECELR and DECSLE
//                             as VT100.js enhancements
//                           DCLinaboxLEDs configuration
// 12-MAY-2015  MGD  v1.3.1, transparent client<->server keep-alive
// 04-APR-2015  MGD  v1.3.0, allow executable to initiate session
//                           integrate with WASD acme.js (MonDesi & aLaMode)
//                           modify hash parse parameters
//                           DCLinaboxFontSize, DCLinaboxSplash configuration
// 20-DEC-2013  MGD  v1.2.1, bugfix; VT100.JS for Firefox '-'/'_' issue
// 20-JUL-2013  MGD  v1.2.0, paste portal
//                           WebSocket support check
//                           set DCLinaboxVersion by server
//                           audible bell via MP3
// 01-OCT-2012  MGD  v1.1.0, single sign-on (in DCLINABOX.EXE)
//                           dynamic terminal resize
//                           refine process termination reporting
//                           set terminal title to include logged-in username
//                           JavaScript/DCLINABOX.EXE IPC 'escape' sequences
// 21-JUL-2012  MGD  v1.0.2, dclws.onopen() MSIE (10) needs the try-catch
//                           plus VT100.JS MSIE (10) non-breaking 0xa0 space
//                           DCLinaboxLogoutClose configuration
// 28-APR-2012  MGD  v1.0.1, kludge for Firefox line height discrepencies
//                           DCLinaboxWxH configuration
// 04-DEC-2011  MGD  initial
//

///////////////////////////////////////////////////////////////////////////////

///////////////////////////////
// acme required infrastructure
///////////////////////////////

function $dclinabox ()
{
   // let acme know the frame has commenced loading OK
   if (window.location.search.substr(1,6) == 'frame=') acmeIframeCheck(true);

   // kick off the terminal by loading the JavaScript
   acmeLoadFile('loadinabox.js');
}
// this shonky causes the script to abort after instatiating $dclinabox()
if (typeof getParameter != 'function')
   throw new Error('*** NOT A REAL ERROR *** (DCLinabox.js kludge :-)');

var inabox_AcmeFrame = (typeof acmeIframeCheck == 'function') ? true : false;

///////////////////////////////////////////////////////////////////////////////

///////////////////////
// rest of DCLinabox //
///////////////////////

var DCLinaboxVersion = 'v1.7.4';
// versions of DCLBINABOX.EXE this JavaScript is compatible with
var compatibleVersions = new Array ('1.7.0','1.7.1','1.7.2','1.7.3','1.7.4','1.7.5'); 
var DCLinaboxCopyright = '2011-2024 Mark G. Daniel';

/* DEVELOPMENT - repeatedly connects to terminal, disconnects, reconnects */
var DCLinaboxExercise = false;

if (document.getElementById('vtversion'))
   document.getElementById('vtversion').innerHTML = DCLinaboxVersion;

// resize to an embedded terminal iframe as quickly as possible
if (!window.opener)
   if (window.parent.resizeBasicIframe)
      window.parent.resizeBasicIframe(window.frameElement,600,350);

/////////////////////////
// configuration settings
/////////////////////////

// DO NOT MODIFY THESE, follow the instructions in CONFIGINABOX.JS

// language configuration
var messageDefault = { NOTSUP : 'WebSocket not supported!', 

                       // buttons, etc.
                       COCLIP : 'Use Ctrl/Cmd+C to copy to the clipboard.',
                       CONNEC : 'CONNECT',
                       DISCON : 'DISCONNECT',
                       DISURE : 'DISCONNECT: Are you sure?',
                       PACLIP : 'Paste into this box using right-click ' +
                                'or Ctrl/Cmd+V',
                       PRINT  : 'Print',
                       LLE    : 'LLE',
                       LLEPH  : 'Long Line Editor allows \
DCL commands to be composed and then sent to the system.  Unlike the \
terminal which cannot edit behind the current line, the LLE allows a \
very long line to be edited before [Send].  It also allows multiple \
commands to be composed.  Any line terminator ([Return]) is sent.  \
[Strip] removes all terminators from the content.  \
The content remains in the LLE and may be repeatedly modified.',
                       PATXT  : 'paste',
                       VKB    : 'VKB',
                       STRIP  : 'Strip',
                       SEND   : 'Send',
                       TXDATA : 'TX',
                       RXDATA : 'RX',

                       // messages for connection status
                       FAILED : 'FAILED to connect',
                       CONCED : 'CONNECTED',
                       NORESP : 'CONNECTED but no response',
                       BROKEN : 'CONNECTION broken',
                       DISCED : 'DISCONNECTED',
                       LOGOUT : 'LOGOUT',
                       TERMIN : 'TERMINATED',

                       // user menu
                       MNUCPT : 'Copy Terminal',
                       MNUPAT : 'Paste Terminal',
                       MNUCPC : 'Copy Clipboard',
                       MNUPAC : 'Paste Clipboard',
                       MNURST : 'Reset',
                       MNULGI : 'Login Prompt',
                       MNUUNI : 'Unicode',
                       MNUABL : 'Audible Bell',
                       MNUVBL : 'Visual Bell',
                       MNUVPC : 'VMS Keys - PC',
                       MNUVMC : 'VMS Keys - Mac',
                       MNUTLS : 'Light Screen',
                       MNUTDS : 'Dark Screen',
                       MNUTGS : 'Green Screen',
                       MNUABT : 'About...',

                       // other
                       COMPAT : 'JavaScript and executable incompatible.\n' +
                                '(Try reload/refresh, otherwise expect ' +
                                'quirky or broken behaviour!)',
                       SUPPRT : 'Your browser does not support WebSocket!',
                     };

getParameter('DCLinaboxMessage',messageDefault);

for (var key in messageDefault)
   if (typeof DCLinaboxMessage[key] == 'undefined')
      DCLinaboxMessage[key] = messageDefault[key];

var resizeDefault = new Array ('80x12','80x16','80x20','80x24','80x28','80x32',
                               '80x36','80x40','80x44','80x48',
                               '132x24','132x28','132x32','132x36','132x40',
                               '132x44','132x48','132x52','132x56','132x60',
                               '132x64',
                               '255x24','255x48','255x64','255x96','255x255');

// the above but user-supplied array of options
getParameter('DCLinaboxResizeOptions',resizeDefault);

// if true then resize dialogue is available embedded terminals
getParameter('DCLinaboxResizeEmbedded',false);

// always connect via "wss:" (i.e. via SSL, true or false)
getParameter('DCLinaboxSecureAlways',true);

// connect immediately the page opens
getParameter('DCLinaboxImmediate',false);

// by default the [^] button is available on a standalone terminal
getParameter('DCLinaboxAnother',false);

// by default a standalone terminal "LOGOUT" response closes window
getParameter('DCLinaboxLogoutClose',true);

// suppress scrollbar using 0 or set to number of lines in buffer (e.g. 500)
getParameter('DCLinaboxScroll',0);

// obscuring the application by using an alternate script name
getParameter('DCLinaboxScriptName',DCLinaboxAppName());

// light, dark, green
getParameter('DCLinaboxTheme','light');

// enable/disable
getParameter('DCLinaboxVisualBell',true);

// explicitly title the window
getParameter('DCLinaboxTitle','');

// get any explictly defined host name or default to the current host
getParameter('DCLinaboxHost',window.location.host);

// get any explicitly set font-size
getParameter('DCLinaboxFontSize',14);

// the splash screen visibility can be increased
getParameter('DCLinaboxSplash',300);

// editing and numeric keypads VMS-style
getParameter('DCLinaboxVMSkeysPC',false);
getParameter('DCLinaboxVMSkeysMac',false);

// site-defined terminal colour scheme
getParameter('DCLinaboxScreen','');

// display the four keyboard LEDs
getParameter('DCLinaboxLEDs',false);

// is the virtual keyboard available
DCLinaboxHashVKB = 0;
DCLinaboxHashVKBhat = 0;
getParameter('DCLinaboxVKB',1);

// number of characters available in the virtual paste texarea
// zero is default which is itself 524288
DCLinaboxHashPaste = 0;
getParameter('DCLinaboxPaste',0);

// number of lines available in the Long Line Editor (LLE) - zero disables
DCLinaboxHashLLE = 0;
getParameter('DCLinaboxLLE',10);
if (DCLinaboxLLE && (DCLinaboxLLE < 5 || DCLinaboxLLE > 30)) DCLinaboxLLE = 10;

// these are ShellInABox (vt100.js) configuration elements ...

getParameter('suppressAllAudio',true);
getParameter('linkifyURLs',1);

// terminal size
getSizeParameter ();

var charWidth = 0;
var charHeight = 0;
var scrollWidth = 0;
var dclws = null;
var thisDCLinabox = null;
var vtinabox = null;
var vtvkb = null;
var vtlle = null;
var taedit = null;
var lledit = null;
var vtterm = null;
var vtpaste = null;
var vtstatus = null;
var username = null;
var password = null;
var esc = String.fromCharCode(27);
var compatibilityAlert = true;

// 0=unconnected,1=connecting,2=connected,3..n=data_rx,
// -1=[disconnect],-2=logout,-3=terminated
var connectionStatus = 0;

// character sequences emitted by DCLINABOX.EXE for signalling purposes
var substrEscape =     '\r\x02' + 'DCLinabox\x03\r\\';
var consoleEscape =    substrEscape + 'F'; //(plus trailing string)
var alertEscape =      substrEscape + 'A'; //(plus message string)
var writeDelayEscape = substrEscape + '9'; //(plus integer string)
var keepAliveEscape =  substrEscape + '8';
var logoutEscape =     substrEscape + '7';
var passwordEscape =   substrEscape + '6';
var termSizeEscape =   substrEscape + '5'; //(plus WxH string)
var terminateEscape =  substrEscape + '4';
var titleEscape =      substrEscape + '3'; //(plus title string)
var usernameEscape =   substrEscape + '2';
var versionEscape =    substrEscape + '1'; //(plus trailing version string)

var charsABC = '01234567890ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
charsABC = charsABC + charsABC + charsABC + charsABC + charsABC + charsABC;

///////////////////////////
// fairly basic requirement
///////////////////////////

function supportsWebSocket()
{
   return ('WebSocket' in window);
}

///////////////////////////////////////////////////////////////////////////////

/////////////////////////////////////////
// instantiate the DCLinabox/VT100 object
/////////////////////////////////////////

// monkey see, monkey do

function extend(subClass, baseClass)
{
  function inheritance() { }
  inheritance.prototype          = baseClass.prototype;
  subClass.prototype             = new inheritance();
  subClass.prototype.constructor = subClass;
  subClass.prototype.superClass  = baseClass.prototype;
};

function DCLinabox()
{
   thisDCLinabox = this;

   document.getElementById('vtsplash').style.display = 'none';
   document.getElementById('vtinabox').style.display = 'block';

   vtinabox = document.getElementById ('vtinabox');
   vtterm = document.getElementById ('vt100');
   vtvkb = document.getElementById ('vtvkb');
   vtlle = document.getElementById ('vtlle');
   vtstatus = document.getElementById ('vtstatus');
   virtualKeyboard();
   longLineTextArea();

   // calculate a monospace character's width and height
   vtterm.innerHTML = '<div id="scrollor" style="overflow:scroll;"></div>' +
                      '<div id="cursor">' + charsABC + '</div>';
   var cid = document.getElementById('cursor');

   charWidth = cid.clientWidth / (charsABC.length - 1);
   charHeight = cid.clientHeight;

   if (typeof DCLinaboxTheme != 'undefined')
   {
      this.themeLight = this.themeDark =
         this.themeGreen = this.themeLocal = false;
      if (this.DCLinaboxTheme == 'light') this.themeLight = true;
      if (this.DCLinaboxTheme == 'dark') this.themeDark = true;
      if (this.DCLinaboxTheme == 'green') this.themeGreen = true;
      if (this.DCLinaboxTheme == 'local') this.themeLocal = true;
   }

   if (DCLinaboxScroll) {
      var scrollor = document.getElementById('scrollor');
      scrollWidth = scrollor.offsetWidth - scrollor.clientWidth;
   }

   resizeTerminal ();

   if (window.opener) makeTerminal();

   this.superClass.constructor.call(this, vtterm);

   this.maxScrollbackLines = DCLinaboxScroll;
   this.DCLinaboxVMSkeysPC = DCLinaboxVMSkeysPC;
   this.DCLinaboxVMSkeysMac = DCLinaboxVMSkeysMac;

   if (DCLinaboxScreen.length)
   {
      var theme = DCLinaboxScreen.split(',');
      this.themeLocalName = theme[0];
      terminalCSS ('#vt100 .ansi9','color',theme[1]);
      terminalCSS ('#vt100 .bgAnsi9','background-color',theme[2]);
   }
   else
      this.themeLocalName = undefined;

   if ('WebSocket' in window) {
      terminalStatus();
      if (DCLinaboxImmediate) {
         setTimeout(retrieveLogin,100);
         setTimeout(webSocketOpen,250);
      }
   }
   else
      terminalStatus(DCLinaboxNotSupportedMsg);

   vkbBuild();

   if (inabox_AcmeFrame) terminalTickClick();
};
extend(DCLinabox, VT100);

// override the VT100.JS function
// transmit vt100.js key-press to PTD (via WebSocket)

DCLinabox.prototype.keysPressed = function(ch)
{
   if (dclws)
      dataTx(ch);
   else
   if (ch == esc)
      connTerm();
};

// override the VT100.JS function
// add our bell character to the VT status line

DCLinabox.prototype.beep = function()
{
   bellChar(true);
   if (this.visualBell) this.flashScreen();
   // slight delay improves some behaviours
   if (this.audibleBell) setTimeout('playBeep()',250);
};

// override the VT100.JS function
// we'll never need to display that size

DCLinabox.prototype.showCurrentSize = function() {
};

function dataTx (data)
{
   if (!dclws) return;
   if (cboxTx1 || cboxTx2) hexTxRx('|',data);
   if (cboxTx1 && !cboxTx2) return;
   dclws.send(data);
}

function dataRx (data)
{
   if (!dclws) return "";
   if (cboxRx1 || cboxRx2) hexTxRx('!',data);
   if (cboxRx1 && !cboxRx2) return "";
   return thisDCLinabox.vt100(data);
}

function hexTxRx (ch,data)
{
   // do not report DCLinabox internal comms with executable
   if (data.length > substrEscape.length)
      if (data.substring(0,substrEscape.length) == substrEscape)
         return;

   var arr = [];
   for (var i = 0; i < data.length; i++)
      arr[i] = ('00' + data.charCodeAt(i).toString(16)).slice(-2);
   var str = ch + "x" + arr.join("x");
   if (cboxTx1 || cboxRx1)
      thisDCLinabox.vt100(str);
   else
   if (cboxTx2 || cboxRx2)
      console.log(str);
}

///////////////////////////////////////////////////////////////////////////////

////////////////////////////////
// open the WebSocket connection
////////////////////////////////

function webSocketOpen ()
{
   if (!('WebSocket' in window))
   {
      terminalStatus(DCLinaboxMessage.NOTSUP);
      return;
   }

   // with dynamic host list it may have changed since the page was generated!
   getParameter('DCLinaboxHost',window.location.host);

   if (DCLinaboxTitle.length)
   {
      if (window.parent &&
          window.frameElement &&
          window.parent.setDCLinaboxTitle)
         window.parent.setDCLinaboxTitle(DCLinaboxTitle);
      else
         setDCLinaboxTitle(DCLinaboxTitle);
   }
   else
      setDCLinaboxTitle(DCLinaboxTitle);

   if (DCLinaboxHost.substr(0,6) == 'wss://')
   {
      var URL = 'wss://';
      DCLinaboxHost = DCLinaboxHost.substr(6);
   }
   else
   if (DCLinaboxHost.substr(0,5) == 'ws://')
   {
      var URL = 'ws://';
      DCLinaboxHost = DCLinaboxHost.substr(5);
      if (DCLinaboxSecureAlways) URL = 'wss://';
   }
   else
   if (DCLinaboxSecureAlways)
      var URL = 'wss://';
   else
   if (window.location.protocol == 'https:')
      var URL = 'wss://';
   else
      var URL = 'ws://';

   var socketPort = window.location.port;

   if (DCLinaboxHost.indexOf(':') >= 0)
   {
      // includes a specific port
      socketPort = DCLinaboxHost.split(':')[1];
      DCLinaboxHost = DCLinaboxHost.split(':')[0];
      // if only the port was supplied
      if (DCLinaboxHost == '') DCLinaboxHost = window.location.host;
   }
   URL += DCLinaboxHost;

   if (socketPort.length && socketPort != 80 && socketPort != 443)
      URL += ':' + socketPort;

   // path is optional
   if (DCLinaboxScriptName.indexOf('/') == -1)
      URL += '/cgiplus-bin/' + DCLinaboxScriptName;
   else
      URL += DCLinaboxScriptName;

   connectionStatus = 1;

   try { dclws = new WebSocket(URL) }
   catch (err) { alert(err); }

   if (typeof dclws.protocol == 'undefined')
   {
      // WebSocket API/version is not recent enough
      dclws.close();
      dclws = null;
      connectionStatus = 0;
      terminalStatus(DCLinaboxMessage.NOTSUP);
      return;
   }

   // WebSocket open

   dclws.onopen = function(evt)
   {
      connectionStatus = 2;
      DCLinaboxImmediate = true;
      // MSIE (10) needs the try-catch
      window.onbeforeunload = function() { 
         try { return dclws.close(); } catch (err) { return null; }
      };
      vtterm.style.backgroundColor = 'white';
      terminalStatus();
      if (inabox_AcmeFrame) terminalTickStatus(null);
      thisDCLinabox.focusCursor();
      thisDCLinabox.input.focus();
      thisDCLinabox.setWriteDelay();

      var dt = new Date;
      var at = '&nbsp;&nbsp;<span id="howlong"></span><br>' +
               dt.toDateString() + ' ' + dt.toTimeString().substr(0,8);
      var msg = DCLinaboxMessage.CONCED + at;
      howLongNow(null);
      terminalStatus(msg);
      howLongNow(new Date());
   };

   // WebSocket close

   dclws.onclose = function(evt)
   {
      var msg = null;
      var reason = '';
      if (typeof evt != 'undefined') {
         var code = evt.code;
         var reason = ' (' + evt.code
         if (evt.reason.length) reason += ' ' + evt.reason;
         reason += ')';
      }
      var dt = new Date;
      var at = '&nbsp;&nbsp;<span id="howlong"></span><br>' +
               dt.toDateString() + ' ' + dt.toTimeString().substr(0,8);
      switch (connectionStatus) {
         case -3 : msg = DCLinaboxMessage.TERMIN + at; break;
         case -2 : msg = DCLinaboxMessage.LOGOUT + at; break;
         case -1 : msg = DCLinaboxMessage.DISCED + at; break;
         case  0 : msg = '?' + at; break;
         case  1 : msg = DCLinaboxMessage.FAILED + reason + at; break;
         case  2 : msg = DCLinaboxMessage.NORESP + reason + at; break;
         default : msg = DCLinaboxMessage.BROKEN + reason + at; break;
      }
      connectionStatus = 0;
      vtterm.style.backgroundColor = 'whitesmoke';
      terminalStatus(msg);
      howLongNow(false);
      dclws = null;
   };

   // WebSocket data from PTD

   dclws.onmessage = function (evt)
   { 
      if (evt.data.substr(0,substrEscape.length) == substrEscape) {
         // a DCLinabox 'escape' sequence emitted by the executable
         if (evt.data == logoutEscape) {
            if ((DCLinaboxAnother && DCLinaboxLogoutClose) == true)
               window.close();
            else {
               connectionStatus = -2;
               dclws.close();
            }
         }
         else
         if (evt.data == terminateEscape) {
            connectionStatus = -3;
            dclws.close();
         }
         else
         if (evt.data.substr(0,alertEscape.length) == alertEscape) {
            connectionStatus++;
            var msg = evt.data.substr(alertEscape.length);
            alert (msg);
         }
         else
         if (evt.data.substr(0,termSizeEscape.length) == termSizeEscape) {
            connectionStatus++;
            var termSize = evt.data.substr(termSizeEscape.length);
            var WxH = termSize.split('x');
            if (WxH.length == 2)
               resizeTerminal (parseInt(WxH[0]), parseInt(WxH[1]));
         }
         else
         if (evt.data.substr(0,titleEscape.length) == titleEscape) {
            connectionStatus++;
            var title = evt.data.substr(titleEscape.length);
            setDCLinaboxTitle (title);
            if (inabox_AcmeFrame) terminalTickStatus(title);
         }
         else
         if (evt.data.substr(0,usernameEscape.length) == usernameEscape) {
            connectionStatus++;
            if (username && username.length) {
               dataTx(username+'\n'); 
               username = null;
            }
         }
         else
         if (evt.data.substr(0,passwordEscape.length) == passwordEscape) {
            connectionStatus++;
            if (password && password.length) {
               dataTx(password+'\n'); 
               password = null;
            }
         }
         else
         if (evt.data.substr(0,versionEscape.length) == versionEscape) {
            connectionStatus++;
            var version = evt.data.substr(versionEscape.length);
            DCLinaboxVersion = 'v' + version;
            terminalStatus();
            if (compatibleVersions.indexOf(version) != -1)
               compatibilityAlert = false;
         }
         else
         if (evt.data.substr(0,consoleEscape.length) == consoleEscape) {
            connectionStatus++;
            var msg = evt.data.substr(consoleEscape.length);
            console.log (msg+'\n');
         }
         else
         if (evt.data.substr(0,keepAliveEscape.length) == keepAliveEscape)
            dataTx(keepAliveEscape);
         else
            alert ('Unknown DCLinabox escape!');
      }
      else {
         // end-use terminal output
         if (compatibilityAlert) {
            compatibilityAlert = false;
            alert(DCLinaboxMessage.COMPAT);
         }
         connectionStatus++;
         if (thisDCLinabox.logStream) logStream(evt.data);
         var termResponse = dataRx(evt.data);
         if (termResponse.length) dataTx(termResponse); 
         if (inabox_AcmeFrame) terminalTickComms();
      }
   };
}

///////////////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////
// Derive an application identifying name from the script name
//////////////////////////////////////////////////////////////

function DCLinaboxAppName ()
{
   if (typeof $ScriptName == 'undefined') return 'DCLinabox';
   var lio = $ScriptName.lastIndexOf('/');
   if (lio == -1)
      var name = $ScriptName.toLowerCase();
   else
      var name = $ScriptName.substr(lio+1).toLowerCase();
   lio = name.lastIndexOf('.exe');
   if (lio == -1) lio = name.lastIndexOf('.com');
   if (lio != -1) name = name.substring(0,lio);
   // support script name obfuscation by eliminating all but alphanumerics
   name = name.replace(/[^a-zA-Z0-9-]/g,'');
   return (name);
}

///////////////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////
// get parameters from hash (or search string)
//////////////////////////////////////////////

// only these directives may be set from the hash data
var parseHashAllowed = new Array
(
'Another','FontSize','Height','Host',
'Immediate','LLE','LogoutClose',
'Minimise','Minimize','Paste',
'ResizeEmbedded','Screen','ScriptName',
'Scroll','Splash','Style','Title','Theme',
'VisualBell','VKB','VKB^','VMSkeysPC','VMSkeysMac',
'Width','WxH'
);

function parseHash ()
{
   if (!window.location.hash.length &&
       !window.location.search.length) return;

   var hash = window.location.hash.substr(1);
   if (!hash.length) hash = window.location.search.substr(1);

   if (hash.substr(0,6) == 'wss://' ||
       hash.substr(0,5) == 'ws://')
   {
      // pre-v1.3 (bookmarklet support)
      if (hash.substr(0,6) == 'wss://') {
         var protocol = 'wss://';
         hash = hash.substr(6);
      }
      else
      if (hash.substr(0,5) == 'ws://') {
         var protocol = 'ws://';
         hash = hash.substr(5);
      }
      else {
         alert('ERROR:'+hash);
         return;
      }

      var WxH = null;
      var sizeat = hash.indexOf(';');
      if (sizeat > 0) {
         WxH = hash.substr(sizeat+1)
         hash = hash.substr(0,sizeat);
      }

      var pathat = hash.indexOf('/');
      if (pathat > 0) {
         var host = hash.substr(0,pathat)
         var script = hash.substr(pathat);
      }
      else {
         alert('ERROR:'+hash);
         return;
      }

      DCLinaboxHost = protocol + host;
      DCLinaboxScriptName = script;
      if (WxH) DCLinaboxWxH = WxH;
   }
   else
   {
      // post-v1.3 (more general request customisation support)
      var directs = hash.split('&');
      for (var idx = 0; idx < directs.length; idx++)
      {
         var item = directs[idx].split('=');
         if (!item[0].length) continue;
         // special cases: from aLaMode or MondeSi
         if (item[0] == 'frame' || item[0] == 'salone') continue;
         if (parseHashAllowed.indexOf(item[0]) == -1) {
            alert('DCLinabox parameter: ' + hash+' ... '+item[0]+'?');
            continue;
         }
         if (item[1] == 'true')
            item[1] = true;
         else
         if (item[1] == 'false')
            item[1] = false;

         /* special cases first */
         if (item[0] == 'VKB')
            window['DCLinaboxHashVKB'] = item[1];
         else
         if (item[0] == 'VKB^')
            window['DCLinaboxHashVKBhat'] = item[1];
         else
         if (item[0] == 'LLE')
            window['DCLinaboxHashLLE'] = item[1];
         else
            /* finally the general case */
            window['DCLinabox'+item[0]] = item[1];
      }
   }

   getSizeParameter ();
}

///////////////////////////////////////////////////////////////////////////////

//////////////////////////////////
// get the terminal size parameter
//////////////////////////////////

function getSizeParameter ()
{
   // width x height
   getParameter('DCLinaboxWxH',null);
   if (DCLinaboxWxH != null) {
      var WxH = DCLinaboxWxH.split('x');
      if (WxH.length == 2) {
         DCLinaboxWidth = parseInt(WxH[0]);
         DCLinaboxHeight = parseInt(WxH[1]);
      }
   }

   // opening terminal width and height
   getParameter('DCLinaboxWidth',80);
   if (DCLinaboxWidth != 80 && DCLinaboxWidth != 132) DCLinaboxWidth = 80;
   getParameter('DCLinaboxHeight',24);
   if (DCLinaboxHeight < 12 || DCLinaboxHeight > 96) DCLinaboxHeight = 24;
}

///////////////////////////////////////////////////////////////////////////////

////////////////////////////////////
// make the popup a terminal window
////////////////////////////////////

var makeTerminalSnap = null;
var makeTerminalPopup = false;

function makeTerminal ()
{
   makeTerminalPopup = true;
   DCLinaboxImmediate = true;
   DCLinaboxAnother = true;
   document.body.style.margin = 0;
   document.body.style.padding = 0;
   document.body.style.overflow = 'hidden';
   vtinabox.style.margin = 0;

   if (typeof window.innerWidth != 'undefined') {
      var width = window.innerWidth;
      var height = window.innerHeight;
   } else {
      var width = document.body.clientWidth; 
      var height = document.body.clientHeight;
   }
   width = parseInt(vtinabox.style.width) - width;
   height = parseInt(vtinabox.style.height) - height;
   if (DCLinaboxScroll) { width++; height++; }
   window.resizeBy(width,height);

   window.onresize = function ()
   {
      clearTimeout(makeTerminalSnap);
      makeTerminalSnap = setTimeout('makeTerminalSnap=null;makeTerminal()',500);
      return true;
   };
}

///////////////////////////////////////////////////////////////////////////////

/////////////////////////////////////////////
// resize a parent IFRAME to fit the terminal
/////////////////////////////////////////////

function makeIframe () {

   if (!(window.parent &&
         window.frameElement &&
         window.parent.resizeDCLinaboxIframe)) return;
         
   document.body.style.margin = 0;
   document.body.style.padding = 0;
   vtinabox.style.margin = 0;

   var width = parseInt(vtinabox.style.width) + 20;
   var height = parseInt(vtinabox.style.height) + 20;
   window.parent.resizeDCLinaboxIframe(window.frameElement,width,height);
}

//////////////////////
// resize the terminal
//////////////////////

function resizeTerminal (cols,rows)
{
   if (typeof cols != 'undefined') DCLinaboxWidth = cols;
   if (typeof rows != 'undefined') DCLinaboxHeight = rows;

   // set the terminal elements' width
   var width = (charWidth * DCLinaboxWidth) + scrollWidth;
   vtterm.style.width = vtterm.style.maxWidth =
      vtvkb.style.width = vtvkb.style.maxWidth =
      vtlle.style.maxWidth = vtlle.style.width = vtlle.style.maxWidth =
      vtstatus.style.width = vtstatus.style.maxWidth = width + 'px';
   width = vtterm.offsetWidth;
   vtinabox.style.width = width + 'px';

   // set the terminal elements' height
   vtterm.style.height = (charHeight * DCLinaboxHeight) + 2 + 'px';
   // dclinabox.css #vtvkb max-height in em
   vtvkb.style.height = (charHeight * parseInt(vtvkb.style.maxHeight)) + 'px';
   // dclinabox.css #vtlle max-height in em
   vtlle.style.height = (charHeight * parseInt(vtlle.style.maxHeight)) + 'px';
   vtstatus.style.height = (charHeight * parseInt(vtstatus.style.maxHeight)) + 'px';
   var height = vtterm.offsetHeight + vtvkb.offsetHeight +
                vtlle.offsetHeight + vtstatus.offsetHeight;
   vtinabox.style.height = height + 'px';

   if (makeTerminalPopup)
      makeTerminal();
   else
      makeIframe();

   if (typeof cols == 'undefined') {
      // initial terminal instantiation
      thisDCLinabox.initializeElements();
      thisDCLinabox.reset();
   }
   else
      thisDCLinabox.resizer();

   terminalStatus();

   if (typeof parent.DCLinaboxResizeFunction == 'function')
      parent.DCLinaboxResizeFunction(width,height);

   if (typeof acmeAdjustSize == 'function')
      acmeAdjustSize();

   thisDCLinabox.focusCursor();
   thisDCLinabox.input.focus();

   if (cboxVKB) document.getElementById('terminalVKB').checked = true;

   setTimeout('longLineAdjust()',100);
};

///////////////////////////////////////////////////////////////////////////////

/////////////////////////
// virtual keyboard (VKB)
/////////////////////////

var cboxVKB = false;

function virtualKeyboardClick (cbox)
{
   if (!cbox) (cbox = document.getElementById('terminalVKB')).checked = true;
   if (cbox.checked)
   {
      cboxVKB = true;
      vtvkb.style.display = 'block';
   }
   else
   {
      cboxVKB = false;
      vtvkb.style.display = 'none';
   }
   resizeTerminal (DCLinaboxWidth, DCLinaboxHeight);
}

function virtualKeyboard ()
{
   vtvkb.style.display = 'none';
   if (!DCLinaboxVKB) return;

   vtvkb.style.backgroundColor = 'white';
   vtvkb.style.borderWidth = '0 2px 1px 2px';
   vtvkb.style.borderColor = 'silver';
   vtvkb.style.borderStyle = 'groove';
}

///////////////////////////////////////////////////////////////////////////////

//////////////////////////
// long-line editor (LLE)
//////////////////////////

var cboxLLE = false;
var cboxRx1 = false;
var cboxRx2 = false;
var cboxTx1 = false;
var cboxTx2 = false;

function longLineTextArea ()
{
   vtlle.style.display = 'none';
   if (!DCLinaboxLLE) return;

   lledit = document.createElement ('TEXTAREA');
   lledit.setAttribute ('id', 'lledit');
   lledit.setAttribute ('maxlength', 2048);
   lledit.setAttribute ('placeholder', DCLinaboxMessage.LLEPH);
   lledit.style.height = '' + DCLinaboxLLE + '.7em';
   lledit.style.outline = 'none';
   lledit.style.resize = 'none';
   lledit.style.border = 'none';
   vtlle.appendChild (lledit);

   vtlle.style.borderWidth = '0 2px 1px 2px';
   vtlle.style.borderColor = 'silver';
   vtlle.style.borderStyle = 'groove';

   setTimeout('longLineAdjust()',50);
}

function longLineAdjust ()
{
   vtlle.style.width = '100%';
   setTimeout('longLineAdjust2()',50);
}

function longLineAdjust2 ()
{
   var width = document.getElementById('scrollable').offsetWidth;
//   var width = vtlle.offsetWidth;
   lledit.style.width = (width - 9) + 'px';
}

function longLineClick (cbox)
{
   if (!cbox) (cbox = document.getElementById('terminalLLE')).checked = true;
   if (cbox.checked)
      showLLE();
   else
      hideLLE();
   resizeTerminal (DCLinaboxWidth, DCLinaboxHeight);
}

function showLLE ()
{
   cboxLLE = true;
   vtlle.style.display = 'block';
   setTimeout ('showTools()',50);
}

function hideLLE ()
{
   cboxLLE = false;
   vtlle.style.display = 'none';
   getToolCheckboxes();
   setTimeout ('hideTools()',50);
}

function showTools ()
{
   document.getElementById('terminalLLE').checked = true;
   document.getElementById('terminalTools').style.display = 'inline-block';
   setTimeout ('setToolCheckboxes()',50);
}

function hideTools ()
{
   document.getElementById('terminalLLE').checked = false;
   document.getElementById('terminalTools').style.display = 'none';
}

function getToolCheckboxes ()
{
   cboxLLE = document.getElementById('terminalLLE').checked;
   cboxRx1 = document.getElementById('checkboxRx1').checked;
   cboxRx2 = document.getElementById('checkboxRx2').checked;
   cboxTx1 = document.getElementById('checkboxTx1').checked;
   cboxTx2 = document.getElementById('checkboxTx2').checked;
}

function setToolCheckboxes ()
{
   document.getElementById('checkboxRx1').checked = cboxRx1;
   document.getElementById('checkboxRx2').checked = cboxRx2;
   document.getElementById('checkboxTx1').checked = cboxTx1;
   document.getElementById('checkboxTx2').checked = cboxTx2;
}

function longLineStrip ()
{
   if (lledit.value.length)
      lledit.value = lledit.value.replace(/(\r\n|\n|\r)/gm, "");;
}

function longLineSend ()
{
   if (lledit.value.length) dataTx (lledit.value);
   lledit.removeAttribute ('placeholder');
}

///////////////////////////////////////////////////////////////////////////////

//////////////////
// terminal status
//////////////////

var terminalStatusMsg;

function terminalStatus (msg)
{
   var style = getStyleRule('#vtnotlogo','cssText').replace(/[\""]/g,'\\"');
   var status = '<div id="vtnotlogo" style="' + style + '">\
<div id="vtcontrol">';

   if (msg)
      terminalStatusMsg = msg;
   else
      msg = terminalStatusMsg;

   if (connectionStatus)
      status += '<input type="submit" \
onclick="discTerm()" value="' + DCLinaboxMessage.DISCON + '">';
   else
   if (thisDCLinabox.loginPrompt)
      status += '<form login-form-autofill-fix autocomplete="on" \
accept-charset="utf-8" method="POST" action="javascript:connTerm();" \
style="display:inline-block;">\
<input type="text" name="username" id="username" placeholder="username" \
value="" size="10">\
<input type="password" name="password" id="password" placeholder="password" \
value="" size="10" \
style="margin-left:0;">\
<input type="submit" id="connect" value="' + DCLinaboxMessage.CONNEC + '">\
</form>';
   else
      status += '<input type="submit" id="connect" \
onclick="connTerm();return false;" value="' + DCLinaboxMessage.CONNEC + '">';

   if (DCLinaboxAnother)
      status += '<button onclick="openAnotherDCLinabox()">' +
                '&nbsp;^&nbsp;</button>';

   if (DCLinaboxAnother || DCLinaboxResizeEmbedded)
      status += '<div id="vtWxH"></div>';

   status += '<input type="submit" \
onclick="thisDCLinabox.vt100(esc+\'[i\');return false;" value="' +
              DCLinaboxMessage.PRINT + '">';

   status += '<textarea id="vtpaste" placeholder="' + 
             DCLinaboxMessage.PATXT + '"></textarea>';

   if (DCLinaboxVKB)
   { 
      status += '<input type="checkbox" id="terminalVKB" \
style="margin-left:0.7em;" onclick="virtualKeyboardClick(this)">\
<div style="display:inline-block;" onclick="vkbDetach()">' +
DCLinaboxMessage.VKB + '</div>';
   }

   if (DCLinaboxLLE)
   { 
      status += '<input type="checkbox" id="terminalLLE" \
style="margin-left:0.7em;" \
onclick="longLineClick(this)">' + DCLinaboxMessage.LLE;

      status += '<div id="terminalTools" style="display:none;">';

      status += '<input type="submit" id="longLineStrip" \
style="margin-left:0.5em;" \
onclick="longLineStrip();return false;" value="' +
DCLinaboxMessage.STRIP + '">';

      status += '<input type="submit" id="longLineSend" \
style="margin-left:0.4em;" \
onclick="longLineSend();return false;" value="' +
DCLinaboxMessage.SEND + '">';

      status += '<input type="checkbox" id="checkboxTx1" \
style="margin-left:0.8em;" \
onclick="cboxTx1 = this.checked">\
<input type="checkbox" id="checkboxTx2" \
style="margin-left:-0.2em;" \
onclick="cboxTx2 = this.checked">' + DCLinaboxMessage.TXDATA;

      status += '<input type="checkbox" id="checkboxRx1" \
style="margin-left:0.5em;" \
onclick="cboxRx1 = this.checked">\
<input type="checkbox" id="checkboxRx2" \
style="margin-left:-0.2em;" \
onclick="cboxRx2 = this.checked">' + DCLinaboxMessage.RXDATA;

      status += '</div>';
   }

   if (DCLinaboxLEDs)
      status += '<div id="leds"><div id="led1">&nbsp;</div>' +
                '<div id="led2">&nbsp;</div><div id="led3">&nbsp;</div>' +
                '<div id="led4">&nbsp;</div></div>';

   if (msg != undefined && msg != null)
      status += '<div id="vtmsg">' + msg + '</div>';

   status += '<div id="vtbell"></div>';

   if (!cboxLLE)
   {
      var style = getStyleRule('#vtlogo','cssText').replace(/[\""]/g,'\\"');
      status += '</div></div><div id="vtlogo" style="' + style + '">\
DCLinabox\n<span style="font-size:90%;">' + DCLinaboxVersion + '</span>';
   }

   status += '</div></div>';

   vtstatus.innerHTML = status;

   if (cboxLLE) showTools();

   if (DCLinaboxAnother || DCLinaboxResizeEmbedded) buttonWxH();

   if (inabox_AcmeFrame) terminalTickStatus(msg);

   if (cboxLLE) document.getElementById('terminalLLE').checked = true;
   if (cboxVKB) document.getElementById('terminalVKB').checked = true;

   var width = document.getElementById('scrollable').offsetWidth;
   vtstatus.style.width = width + 'px';

   vtstatus.style.borderWidth = '0 2px 2px 2px';
   vtstatus.style.borderColor = 'silver';
   vtstatus.style.borderStyle = 'groove';

   howLongNow();

   setTimeout (pasteEvent, 50);
}

function pasteEvent ()
{
   vtpaste = document.getElementById ('vtpaste');
   if (DCLinaboxPaste)
      vtpaste.setAttribute('maxlength', DCLinaboxPaste);
   vtpaste.addEventListener ('mousedown', pasteFocus, false);
   vtpaste.addEventListener ('input', pasteSend, false);
}

function pasteFocus ()
{
   // only allow pull-down [paste] focus when connected
   if (connectionStatus <= 0) return setTimeout (pasteReFocus, 100);
   vtpaste.focus();
}

function pasteReFocus ()
{
   // refocus on the terminal
   thisDCLinabox.focusCursor();
   thisDCLinabox.input.focus();
}

function pasteSend (event)
{
   dataTx (vtpaste.value);
   vtpaste.value = '';
   setTimeout (pasteReFocus, 100);
}

function retrieveLogin ()
{
   if (thisDCLinabox.loginPrompt)
   {
      username = document.getElementById('username').value;
      password = document.getElementById('password').value;
   }
   else
      username = password = null;
}

// connect button clicked

function connTerm ()
{
   retrieveLogin();
   thisDCLinabox.initializeElements();
   thisDCLinabox.reset();
   terminalStatus();
   webSocketOpen ();

   if (DCLinaboxExercise) setTimeout(discTerm,1000);
}

// disconnect button clicked

function discTerm ()
{
   if (DCLinaboxExercise)
   {
      setTimeout(connTerm,3000);
      dclws.close();
      return;
   }

   if (confirm(DCLinaboxMessage.DISURE))
   {
      connectionStatus = -1;
      dclws.close();
   }
}

// resize selection dialogue

function selectWxH ()
{
   if (!dclws) return;

   var vtwxh = document.getElementById('vtWxH');
   var wxh = DCLinaboxWidth + 'x' + DCLinaboxHeight;
   var selected;
   var options = "";
   for (var idx = 0; idx < DCLinaboxResizeOptions.length; idx++) {
      if (DCLinaboxResizeOptions[idx] == wxh)
         selected = ' selected';
      else
         selected = '';
      options += '<option value="' + DCLinaboxResizeOptions[idx] + '"' +
                 selected + '>' + DCLinaboxResizeOptions[idx];
   }
   vtwxh.innerHTML = '<span id="selWxH"" ' +
                     'style="margin-left:5px;margin-right:5px;">' +
                     '<select id="selectWxH" ' +
                     'onblur="buttonWxH()" onchange="changedWxH()">' +
                     options + '</select></span>';

   var selectwxh = document.getElementById('selectWxH');
   selectwxh.focus();
}

// resize selection changed

function changedWxH ()
{
   var selectwxh = document.getElementById('selectWxH');
   var wxh = selectwxh.options[selectwxh.selectedIndex].text;
   var defer = 'buttonWxH("' + wxh + '")';
   setTimeout (defer, 50);
   if (dclws) dataTx(termSizeEscape+wxh);
}

// enable/disable (developmental) write delay

function writeDelay (millisec)
{
   if (dclws) dataTx(writeDelayEscape+millisec);
}

// make the WxH button

function buttonWxH (wxh)
{
   if (typeof wxh == 'undefined') wxh = DCLinaboxWidth + 'x' + DCLinaboxHeight;
   var vtwxh = document.getElementById('vtWxH');
   vtwxh.innerHTML = '<button onclick="selectWxH()">&nbsp;' +
                     wxh + '&nbsp;</button>';
}

// [^] button clicked

function openAnotherDCLinabox ()
{
   var specs = 'toolbar=0,location=0,directories=0,status=0,menubar=0,' +
               'scrollbars=0,resizable=0,copyhistory=0,width=' +
               (DCLinaboxWidth * charWidth) + ',height=' +
               ((DCLinaboxHeight * charHeight) + vtvkb.offsetHeight  +
               vtlle.offsetHeight + vtstatus.offsetHeight);

   window.open(window.location.href,'_blank',specs);
}

// set the title of a standalone terminal
// this function can also be found in OPENINABOX.JS

function setDCLinaboxTitle (title)
{
   // do not override a configuration set title
   if (DCLinaboxTitle.length) return;
   if (typeof title == 'undefined' ||
       !title.length ||
       title.substr(0,1) == '?')
      title = 'DCLinabox: ' + DCLinaboxHost;
   document.getElementsByTagName('title')[0].innerHTML = title;
}

///////////////////////////////////////////////////////////////////////////////

//////////////////////////
// log the terminal stream
//////////////////////////

function logStream (data)
{
   var ch;
   var line = '[' + data.length + ']';
   for (var i = 0; i < data.length; i++) {
      ch = data.charCodeAt(i).toString(16);
      if (ch.length < 2) ch = '0' + ch;
      line += '\u00a0' + ch;
   }
   line += '\n[' + data.length + ']';
   for (var i = 0; i < data.length; i++) {
      ch = data[i];
      switch (ch)
      {
         case '\u0000': ch = '\\0'; break;
         case '\u0007': ch = '\\a'; break;
         case '\u0008': ch = '\\b'; break;
         case '\u0009': ch = '\\t'; break;
         case '\u000a': ch = '\\n'; break;
         case '\u000b': ch = '\\v'; break;
         case '\u000c': ch = '\\f'; break;
         case '\u000d': ch = '\\r'; break;
         case '\u001b': ch = '\\e'; break;
         default : if (ch < ' ' || ch > '~') ch = '\u00a0';
      }
      if (ch.length == 1) ch = '\u00a0' + ch;
      line += '\u00a0' + ch;
   }
   console.log(line);
}

///////////////////////////////////////////////////////////////////////////////

///////////////////////////////////////////
// "He's deaf. The bells have made him so."
///////////////////////////////////////////

var vtbell = null;
var bellCharCount = 0;
var utf237e = null;

function bellChar (ding)
{
   if (!vtbell) vtbell = document.getElementById('vtbell');
   utf237e = '<span style="display:inline-block;' +
             'transform:scale(1.4,1.4)translateY(0.1em);">' +
             '&nbsp;&#9086;</span>';
   if (ding) {
      if (bellCharCount > 10) return;
      bellCharCount++;
      setTimeout('bellChar(false)',900);
   }
   else {
      bellCharCount--;
   }
   var bellCharVisual = '';
   for (var cnt = bellCharCount; cnt; cnt--) bellCharVisual += utf237e;
   vtbell.innerHTML = bellCharVisual;
}

function playBeep()
{
   var src = 'beep.mp3';
   var audio, embed, obj;
   audio = document.createElement('audio');
   if (audio && audio.canPlayType && audio.canPlayType('audio/mpeg'))
   {
      audio.setAttribute('src', src);
      audio.setAttribute('autoplay', true);
      audio.setAttribute('controls', false);
      audio.load();
      audio.play();
   }
   else
   if ((obj = document.createElement('object')))
   {
      obj.setAttribute('type','audio/mpeg');
      obj.setAttribute('data', src);
      obj.setAttribute('autostart', true);
      document.getElementsByTagName('body')[0].appendChild(obj);
   }
   else
   if ((embed = document.createElement('embed')))
   {
      embed.setAttribute('type','audio/mpeg');
      embed.setAttribute('src', src);
      embed.setAttribute('autostart', true);
      document.getElementsByTagName('body')[0].appendChild(embed);
   }
}

///////////////////////////////////////////////////////////////////////////////

// update the 'howlong' with how long
// if |start| an object (date) then kick-off the duration display
// if |start| a boolean (true or false) stop the duration display

var howLongStart = 0;
var howLongTimer = null;

function howLongNow (start)
{
   var now, mSec, days, daysmSec, hours, hoursmSec, mins, minsmSec, secs;

   if (typeof start != 'undefined')
   {
      if (start == null)
         howLongStart = 0;
      else
      if (typeof start == 'object')
      {
         // of milliseconds from date
         howLongStart = start;
         howLongTimer = setInterval(howLongNow,60000);
      }
      else
      if (typeof start == 'boolean')
      {
         clearInterval(howLongTimer);
         howLongTimer = null;
      }
   }

   if (!howLongStart) return;

   now = new Date();
   mSec = now - howLongStart;
   days = Math.floor(mSec / (24*60*60*1000));
   if (days < 1) days = ''; else days = days + '-';
   daysmSec = mSec % (24*60*60*1000);
   hours = Math.floor((daysmSec)/(60*60*1000));
   if (hours < 10) hours = '0' + hours;
   hoursmSec= mSec % (60*60*1000);
   mins = Math.floor((hoursmSec)/(60*1000));
   if (mins < 10) mins = '0' + mins;
   minsmSec = mSec % (60*1000);
   secs = Math.floor((minsmSec)/(1000));

   document.getElementById('howlong').innerHTML = '(' + days + hours + ':' + mins + ')';
}

///////////////////////////////////////////////////////////////////////////////

///////////////////////////
// more acme infrastructure
///////////////////////////

function inaboxAcmeInit ()
{
   var checked = ' checked';
   getParameter('DCLinaboxMinimise',false);
   getParameter('DCLinaboxMinimize',false);
   if (DCLinaboxMinimise || DCLinaboxMinimize) checked = '';

   $byId('vttick').innerHTML = '<input id="terminalTick" type="checkbox" \
style="position:absolute;top:0;left:0;z-index:99;" \
onclick="terminalTickClick(this)"' + checked + '>';
}

/*
The terminal tick checkbox has been clicked.
*/

function terminalTickClick ()
{
   var tick = $byId('terminalTick');
   var vtinabox = $byId('vtinabox');
   var vtacme = $byId('vtacme');
   if (tick.checked)
   {
      vtacme.setAttribute('name','acme_App_Div')
      vtinabox.setAttribute('name','acmeAppDiv')
      vtinabox.style.display = 'block';
      vtacme.style.display = 'none';
   }
   else
   {
      vtinabox.setAttribute('name','acme_App_Div')
      vtacme.setAttribute('name','acmeAppDiv')
      terminalTickStatus();
      vtinabox.style.display = 'none';
      vtacme.style.display = 'block';
      vtacme.style.width = parseInt(vtinabox.style.width) - 20 + 'px';
      if (acme_StandAlone)
      {
         terminalCSS ('#vtacme','background-color','transparent');
         terminalCSS ('#vtacme','border','none');
         terminalCSS ('#vtacme','box-shadow','none');
      }
   }
   acmeAdjustSize();
}

/*
Put this message into the terminal tick status.
*/

var terminalTickMsg = null;

function terminalTickStatus (msg)
{
   if (typeof msg != 'undefined') terminalTickMsg = msg;
   var vtacme = $byId('vtacme');
   var html = '<span class="acmeDCLinabox">DCLinabox</span>' +
              ' &nbsp;&ndash;&nbsp; ';
   if (connectionStatus)
      if (terminalTickMsg)
         html += 'connected';
      else
         html += 'connected &nbsp;&ndash;&nbsp; ' + DCLinaboxHost;
   else
      html += 'not connected';
   if (terminalTickMsg) html += ' &nbsp;&nbsp;&nbsp; ' + terminalTickMsg;
   html += '<span style="margin-left:1em;" id="terminalTickComms"></span>';
   vtacme.innerHTML = html;
}

/*
Each time there is network traffic with the terminal indicate that with a
lightning symbol on the terminal tick status.
*/

var terminalTickCommsTimer = null;

function terminalTickComms(timeout)
{
   var comms = $byId('terminalTickComms');
   if (timeout)
   {
      terminalTickCommsTimer = null;
      if (comms) comms.innerHTML = '';
      return;
   }
   if (terminalTickCommsTimer) return;
   terminalTickCommsTimer = setTimeout('terminalTickComms(true)',900);
   if (comms)
      comms.innerHTML = '<span style="display:inline-block;' +
                        'transform:scale(1.4,1.4)translateY(0.1em);">' +
                        '&nbsp;&#9889;</span>';
}

/*
Dynamically modify a stylesheet.
*/

function terminalCSS (selector, property, value)
{
    for (var idx = 0; idx < document.styleSheets.length; idx++)
    {
       var sheet = document.styleSheets[idx];
       try {
          var rule = selector + '{' + property + ':' + value + ';}';
          sheet.insertRule(rule,sheet.cssRules.length);
       }
       catch(err) {
          try {
             sheet.addRule(selector,property+':'+value);
          }
          catch(err) {}
       }
    }
}

/*
Return a reference to the specified stylesheet.
*/

function getStyleRule (selector, style)
{
   for (var i = 0; i < document.styleSheets.length; i++)
   {
      var thesheet = document.styleSheets[i];
      var therules = thesheet.cssRules ? thesheet.cssRules : thesheet.rules;

      for (var j = 0; j < therules.length; j++)
      {
         // console.log(therules[j].selectorText);
         if (therules[j].selectorText && therules[j].selectorText === selector)
         {
            // console.log(therules[j].style);
            if (!style) return therules[j].style;
            return therules[j].style[style];
         }
      }
   }
   return '"' + selector + '" "' + style + '" not found';
}

///////////////////////////////////////////////////////////////////////////////

///////////////////
// inline execution
///////////////////

parseHash();

// create a style element and add some inline style
{
   var style = '';

   style += '#vtinabox { font-size: ' + DCLinaboxFontSize + 'px; }\n';
   style += '#lledit { font-size: ' + DCLinaboxFontSize + 'px; }\n';

   if (typeof DCLinaboxScroll == "undefined" || !DCLinaboxScroll)
      style += '#vt100 #scrollable { overflow: hidden; }\n';

   // comment from original ShellInABox DEMO.HTML on why this was included

   // We would like to hide overflowing lines as this can lead to
   // visually jarring results if the browser substitutes oversized
   // Unicode characters from different fonts. Unfortunately, a bug
   // in Firefox prevents it from allowing multi-line text
   // selections whenever we change the "overflow" style. So, only
   // do so for non-Netscape browsers.

   if (typeof navigator.appName == 'undefined' ||
       navigator.appName != 'Netscape')
     style += '#vt100 #console div, #vt100 #alt_console div ' +
              '{ overflow: hidden; }\n';

   var styleobj = document.createElement('style');
   styleobj.setAttribute('type','text/css');
   styleobj.innerHTML = style;
   document.getElementsByTagName('head')[0].appendChild(styleobj);
}

if (inabox_AcmeFrame) inaboxAcmeInit();

if (supportsWebSocket())
   setTimeout('new DCLinabox()',DCLinaboxSplash+10);
else
   alert (DCLinaboxMessage.SUPPRT);

if (navigator.platform.toUpperCase().search('OS X') >= 0)
{
   /* :-/ at least Mojave and Catalina has a "thin" 0x2592 distorting
      the character layout for some browsers.  Substitute this! */
   VT100.prototype.VT100GraphicsMap [97] = 0x2591;  // or 0x2593
}

/* implement the hash directives */
if (DCLinaboxHashVKB) setTimeout (virtualKeyboardClick,500,null);
if (DCLinaboxHashVKBhat) setTimeout (vkbDetach,510);
if (DCLinaboxHashLLE) setTimeout (longLineClick,520,null);

//////
// end
//////