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


// Helpline messages
b_help = "Bold text: <b>text</b>  (alt+b)";
i_help = "Italic text: <i>text</i>  (alt+i)";
u_help = "Underline text: <u>text</u>  (alt+u)";
q_help = "Quote text: <quote>text</quote>  (alt+q)";
c_help = "Code display: <code>code</code>  (alt+c)";
l_help = "List: <list>text</list> (alt+l)";
o_help = "Ordered list: <list=>text</list>  (alt+o)";
p_help = "Insert image: <img>http://image_url</img>  (alt+p)";
w_help = "Insert URL: <url>http://url</url> or [url=http://url]URL text[/url]  (alt+w)";
a_help = "Close all open bbCode tags";
s_help = "Font color: <font color=\"red\">text</color>  Tip: you can also use color=#FF0000";
f_help = "Font size: <font size=\"x-small\">small text</size>";

// Define the bbCode tags
bbcode = new Array();
bbtags = new Array('<b>','</b>','<i>','</i>','<u>','</u>','<em>','</em>','<h1>','</h1>','<h2>','</h2>','<h3>','</h3>','<h4>','</h4>','<q>','</q>','<pre>','</pre>','<p>','</p>','<li>','</li>','<img src="" />','','<a href="">','</a>');
imageTag = false;

// Shows the help messages in the helpline window
function helpline(help) {
	document.fw.helpbox.value = eval(help + "_help");
}


// 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(field,bbopen, bbclose) {
	if ((clientVer >= 4) && is_ie && is_win) {
		theSelection = document.selection.createRange().text;
		if (!theSelection) {
			eval('document.fw.'+field+'.value += bbopen + bbclose');
			eval('document.fw.'+field+'.focus()');
			return;
		}
		document.selection.createRange().text = bbopen + theSelection + bbclose;
		eval('document.fw.'+field+'.focus()');
		return;
	} else {
		eval('document.fw.'+field+'.value += bbopen + bbclose');
		eval('document.fw.'+field+'.focus()');
		return;
	}

	eval('storeCaret(document.fw.'+field+')');
}


function bbstyle(field, bbnumber) {

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

	if (bbnumber == -1) { // Close all open tags & default button names
		while (bbcode[0]) {
			butnumber = arraypop(bbcode) - 1;
			eval('document.fw.'+field+'value += bbtags[butnumber + 1]');
			buttext = eval('document.fw.'+field+'bb'+butnumber+'.value');
			eval('document.fw.'+field+'bb'+butnumber+'.value ="' + buttext.substr(0,(buttext.length - 1)) + '"');
		}
		imageTag = false; // All tags are closed including image tags :D
		eval('document.fw.'+field+'.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];
		eval('document.fw.'+field+'.focus()');
		theSelection = '';
		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;
				eval('document.fw.'+field+'.value += bbtags[butnumber + 1]');
				buttext = eval('document.fw.'+field+'bb' + butnumber + '.value');
				eval('document.fw.'+field+'bb' + butnumber + '.value ="' + buttext.substr(0,(buttext.length - 1)) + '"');
				imageTag = false;
			}
			eval('document.fw.'+field+'.focus()');
			return;
	} else { // Open tags

		if (imageTag && (bbnumber != 14)) {		// Close image tag before adding another
			eval('document.fw.'+field+'.value += bbtags[15]');
			lastValue = arraypop(bbcode) - 1;	// Remove the close image tag from the list
			eval('document.fw.'+field+'bb14.value = "Img"');	// Return button back to normal state
			imageTag = false;
		}

		// Open tag
		eval('document.fw.'+field+'.value += bbtags[bbnumber]');
		if ((bbnumber == 14) && (imageTag == false)) imageTag = 1; // Check to stop additional tags after an unclosed image tag
		arraypush(bbcode,bbnumber+1);
		eval('document.fw.'+field+'bb'+bbnumber+'.value += "*"');
		eval('document.fw.'+field+'.focus()');
		return;
	}
	eval('storeCaret(document.fw.'+field+')');
}

// Insert at Claret position. Code from
// http://www.faqts.com/knowledge_base/view.phtml/aid/1052/fid/130
function storeCaret(textEl) {
	if (textEl.createTextRange) textEl.caretPos = document.selection.createRange().duplicate();
}