// --------------------------------------------------------------------------


function insertAtCursor(element, start, end) {
    element = document.getElementById(element);
    
    // IE
    if (document.selection) {
	element.focus();
	caretPos = document.selection.createRange().duplicate();
	
	caretPos.text = start + caretPos.text + end;
	
	if (caretPos.text.length == 0)
	{
		caretPos.moveStart("character", -end.length);
		caretPos.moveEnd("character", -end.length);
		caretPos.select();
	}
	
	
	element.focus(caretPos);
 
    // MOZILLA
    
    } else if (element.selectionStart || element.selectionStart == '0') {
    
        element.focus();
    
        var startPos = element.selectionStart;
        var endPos = element.selectionEnd;
	var preTxt = element.value.substring(0, startPos);
	var selTxt = element.value.substring(startPos, endPos) ;
	var follTxt = element.value.substring(endPos, element.value.length);
	var scrollPos = element.scrollTop;
 
	
        element.value = preTxt + start + selTxt + end + follTxt;
	
 
	if (element.setSelectionRange)
	{
		if (selTxt.length == 0)
			element.setSelectionRange(startPos + start.length, startPos + start.length);
		else
			element.setSelectionRange(startPos, startPos + start.length + selTxt.length + end.length);
		element.focus();
	}
	element.scrollTop = scrollPos;
	
    } else {
    
        element.value += start + end;
    }
}
// calling the function
// insertAtCursor(document.formName.fieldName, ‘this value’);

function insBBCode(code) {
	
	insertAtCursor('content', '[' + code + ']','[/' + code + ']');
}


function insImage(val) {
	if (val !='--')
	insertAtCursor('content', '[img=images/'+val+']',' ');
}


function insAttach(val) {
if (val !='--')
	insertAtCursor('content', '[url=attachs/'+val+']','[/url]');
}

//-------------------------------------------------------------------------

var bbcode_editmode = true; // if false, tab move to next element
function tabKeyOverrider() {

	// Observe keypress on these fields
	if (Event.observe)
		Event.observe($('content'), 'keypress', checkTab);
          
}

var bbcode_mode_trapTab = false;

// took from
// http://www.ajaxian.com/archives/handling-tabs-in-textareas
// with the 'mode' thingie... I think I'll add more 'trapping' stuff like this for Ctrl+B (bold) etc. 
// At this time we're just using the altkey function (which is not that bad anyway)

function checkTab(evt) {
	
	if (evt.keyCode == Event.KEY_ESC) {
		if (bbcode_mode_trapTab) {
			var bar = $('bbcode_statusbar');
			bar.style.background = 'green';
			bar.innerHTML = 'Normal mode. Press <Esc> to switch editing mode.';
			bbcode_mode_trapTab = false;
		} else {
			var bar = $('bbcode_statusbar');
			bar.style.background = 'blue';
			bar.innerHTML = 'Editing mode. <Tab> is now allowed in the textarea. <Esc> to switch.';
			bbcode_mode_trapTab = true;
		}
	}
	
	if (!bbcode_mode_trapTab)
		return;


	// Set desired tab- defaults to four space softtab
	var tab = "\t";

    var t = evt.target;
    var ss = t.selectionStart;
    var se = t.selectionEnd;

    // Tab key - insert tab expansion
    if (evt.keyCode == 9) {
        evt.preventDefault();
               
        // Special case of multi line selection
        if (ss != se && t.value.slice(ss,se).indexOf("\n") != -1) {
            // In case selection was not of entire lines (e.g. selection begins in the middle of a line)
            // we ought to tab at the beginning as well as at the start of every following line.
            var pre = t.value.slice(0,ss);
            var sel = t.value.slice(ss,se).replace(/\n/g,"\n"+tab);
            var post = t.value.slice(se,t.value.length);
            t.value = pre.concat(tab).concat(sel).concat(post);
                   
            t.selectionStart = ss + tab.length;
            t.selectionEnd = se + tab.length;
        }
               
        // "Normal" case (no selection or selection on one line only)
        else {
            t.value = t.value.slice(0,ss).concat(tab).concat(t.value.slice(ss,t.value.length));
            if (ss == se) {
                t.selectionStart = t.selectionEnd = ss + tab.length;
            }
            else {
                t.selectionStart = ss + tab.length;
                t.selectionEnd = se + tab.length;
            }
        }
    }
}



if (typeof(Event.observe)=='function') //prototype is loaded
	{ Event.observe(window, 'load', tabKeyOverrider, false) }