var LF = String.fromCharCode(10);

function insert_user(el,user_id)
{
  var content = ExtGetElementById(el);
  content.value += '[USER]'+user_id+'[/USER] ';
}

function quote(el, user_id, text)
{
  if (text == '') {
    return;
  }
  var content = ExtGetElementById(el);
  content.value += '[QUOTE][USER]' + user_id + '[/USER]' + LF + text + '[/QUOTE]' + LF;
}

function get_selection()
{
  selection = '';
  if (window.getSelection) selection = window.getSelection() + '';
  else if (document.getSelection) selection = document.getSelection() + '';
  else if (document.selection) selection = document.selection.createRange().text + '';
  selection = selection.replace(/\r/gi, '');
  while (selection.indexOf('  ') != -1) {
    selection = selection.replace(/  /gi, '');
  }
}

// Startup variables
var imageTag = false;
var theSelection = false;

// Check for Browser & Platform for PC & IE specific bits
// More details from: http://www.mozilla.org/docs/web-developer/sniffer/browser_type.html
var clientPC = navigator.userAgent.toLowerCase(); // Get client info
var clientVer = parseInt(navigator.appVersion); // Get browser version

var is_ie = ((clientPC.indexOf("msie") != -1) && (clientPC.indexOf("opera") == -1));
var is_nav = ((clientPC.indexOf('mozilla')!=-1) && (clientPC.indexOf('spoofer')==-1) && (clientPC.indexOf('compatible') == -1) && (clientPC.indexOf('opera')==-1) && (clientPC.indexOf('webtv')==-1) && (clientPC.indexOf('hotjava')==-1));
var is_moz = 0;

var is_win = ((clientPC.indexOf("win")!=-1) || (clientPC.indexOf("16bit") != -1));
var is_mac = (clientPC.indexOf("mac")!=-1);

// Define the bbCode tags
bbcode = new Array();
bbtags = new Array('[b]','[/b]','[i]','[/i]','[u]','[/u]','[center]','[/center]','[left]','[/left]','[right]','[/right]','[color=]','[/color]','[email]','[/email]','[email=]','[/email]','[url]','[/url]','[url=]','[/url]','[img]','[/img]','[quote]','[/quote]','[mark]','[/mark]','[code]','[/code]');
imageTag = false;

// Replacement for arrayname.length property
function getarraysize(thearray) {
  for (i = 0; i < thearray.length; i++) {
    if ((thearray[i] == "undefined") || (thearray[i] == "") || (thearray[i] == null)) return i;
  }
  return thearray.length;
}

// Replacement for arrayname.push(value) not implemented in IE until version 5.5
// Appends element to the array
function arraypush(thearray,value) {
  thearray[ getarraysize(thearray) ] = value;
}

// Replacement for arrayname.pop() not implemented in IE until version 5.5
// Removes and returns the last element of an array
function arraypop(thearray) {
  thearraysize = getarraysize(thearray);
  retval = thearray[thearraysize - 1];
  delete thearray[thearraysize - 1];
  return retval;
}

function bbfontstyle(bbopen, bbclose) {
  var txtarea = document.comment.content;

  if ((clientVer >= 4) && is_ie && is_win) {
    theSelection = document.selection.createRange().text;
    if (!theSelection) {
      txtarea.value += bbopen + bbclose;
      txtarea.focus();
      return;
    }
    document.selection.createRange().text = bbopen + theSelection + bbclose;
    txtarea.focus();
    return;
  }
  else if (txtarea.selectionEnd && (txtarea.selectionEnd - txtarea.selectionStart > 0)) {
    mozWrap(txtarea, bbopen, bbclose);
    return;
  }
  else {
    txtarea.value += bbopen + bbclose;
    txtarea.focus();
  }
  storeCaret(txtarea);
}

function bbstyle(el,bbnumber) {
  var txtarea = ExtGetElementById(el);

  donotinsert = false;
  theSelection = false;
  bblast = 0;

  if (bbnumber == -1) { // Close all open tags & default button names
    while (bbcode[0]) {
      butnumber = arraypop(bbcode) - 1;
      txtarea.value += bbtags[butnumber + 1];
    }
    imageTag = false; // All tags are closed including image tags :D
    txtarea.focus();
    return;
  }

  if ((clientVer >= 4) && is_ie && is_win) {
    theSelection = document.selection.createRange().text; // Get text selection
    if (theSelection) {
      // Add tags around selection
      document.selection.createRange().text = bbtags[bbnumber] + theSelection + bbtags[bbnumber+1];
      txtarea.focus();
      theSelection = '';
      return;
    }
  }
  else if (txtarea.selectionEnd && (txtarea.selectionEnd - txtarea.selectionStart > 0)) {
    mozWrap(txtarea, bbtags[bbnumber], bbtags[bbnumber+1]);
    return;
  }

  // Find last occurance of an open tag the same as the one just clicked
  for (i = 0; i < bbcode.length; i++) {
    if (bbcode[i] == bbnumber+1) {
      bblast = i;
      donotinsert = true;
    }
  }

  if (donotinsert) {    // Close all open tags up to the one just clicked & default button names
    while (bbcode[bblast]) {
        butnumber = arraypop(bbcode) - 1;
        txtarea.value += bbtags[butnumber + 1];
        imageTag = false;
      }
      txtarea.focus();
      return;
  }
  else { // Open tags

    if (imageTag && (bbnumber != 14)) {    // Close image tag before adding another
      txtarea.value += bbtags[15];
      lastValue = arraypop(bbcode) - 1;  // Remove the close image tag from the list
      
      imageTag = false;
    }

    // Open tag
    txtarea.value += bbtags[bbnumber];
    if ((bbnumber == 14) && (imageTag == false)) imageTag = 1; 
    arraypush(bbcode,bbnumber+1);
    txtarea.focus();
    return;
  }
  storeCaret(txtarea);
}

// From http://www.massless.org/mozedit/
function mozWrap(txtarea, open, close)
{
  var selLength = txtarea.textLength;
  var selStart = txtarea.selectionStart;
  var selEnd = txtarea.selectionEnd;
  if (selEnd == 1 || selEnd == 2) selEnd = selLength;

  var s1 = (txtarea.value).substring(0,selStart);
  var s2 = (txtarea.value).substring(selStart, selEnd)
  var s3 = (txtarea.value).substring(selEnd, selLength);
  txtarea.value = s1 + open + s2 + close + s3;
  return;
}