//
// @author Bernard Paques [email]bernard.paques@bigfoot.com[/email]
// @tester Fernand
// @reference
// @license http://www.gnu.org/copyleft/lesser.txt GNU Lesser General Public License
//

function countInstances(open,closed) {
     var ta = document.getElementById('edit_area');

     var opening = ta.value.split(open);
     var closing = ta.value.split(closed);
     return opening.length + closing.length - 2;
}

// insert some text
function edit_insert(text1, text2) {
     var ta = document.getElementById('edit_area');

	// ie
    if (document.selection) {
        var str = document.selection.createRange().text;
        ta.focus();
        var sel = document.selection.createRange();
        if (text2!="") {
           if (str=="") {
              var instances = countInstances(text1,text2);
              if (instances%2 != 0){ sel.text = sel.text + text2;}
              else{ sel.text = sel.text + text1;}
           } else {
              sel.text = text1 + sel.text + text2;
           }
        } else {
           sel.text = sel.text + text1;
        }

     // mozilla
     } else if (ta.selectionStart | ta.selectionStart == 0) {
        if (ta.selectionEnd > ta.value.length) {
            ta.selectionEnd = ta.value.length;
        }

        var firstPos = ta.selectionStart;
        var secondPos = ta.selectionEnd+text1.length;

        ta.value=ta.value.slice(0,firstPos)+text1+ta.value.slice(firstPos);
        ta.value=ta.value.slice(0,secondPos)+text2+ta.value.slice(secondPos);

        ta.selectionStart = firstPos+text1.length;
        ta.selectionEnd = secondPos;
        ta.focus();

     } else { // Opera
        var sel = document.hop.contenu;

        var instances = countInstances(text1,text2);
        if (instances%2 != 0 && text2 != ""){
            sel.value = sel.value + text2;
        } else{
            sel.value = sel.value + text1;
        }
     }
}

// insert current date
function edit_insert_date() {
	var now = new Date();
	edit_insert('\n- '+now.toString().substring(4, 10)+' ', '');
}

// tabindex to avoid form cluttering with buttons
document.write('<div style="margin-top: 2px;">'
    + '<a href="#" onclick="edit_insert_date();return false;" class="button" title="Date [d]" tabindex="1000" accesskey="d">- Date </a>'
    + '<a href="#" onclick="edit_insert(\'[nl]\',\'\');return false;" class="button" title="New line [n]" tabindex="1001" accesskey="n">[nl]</a>'
    + '<a href="#" onclick="edit_insert(\'\\t\',\'\');return false;" class="button" title="Tab [t]" tabindex="1002" accesskey="t"> -> </a>'
    + '<a href="#" onclick="edit_insert(\'[b]\',\'[/b]\');return false;" class="button" title="Bold [b]" tabindex="1003" accesskey="b"> <b>B</b> </a>'
    + '<a href="#" onclick="edit_insert(\'[i]\',\'[/i]\');return false;" class="button" title="Italic [i]" tabindex="1004" accesskey="i"> <i>I </i> </a>'
    + '<a href="#" onclick="edit_insert(\'[u]\',\'[/u]\');return false;" class="button" title="Underlined [u]" tabindex="1005" accesskey="u"> <u>U</u> </a>'
    + '<a href="#" onclick="edit_insert(\'\\n[*] \',\'\');return false;" class="button" title="Bullet [x]" tabindex="1006" accesskey="x">[*]</a>'
    + '<a href="#" onclick="edit_insert(\'[link=Label]\',\'[/link]\');return false;" class="button" title="Link [l]" tabindex="1007" accesskey="l">[link]</a>'
    + '<a href="#" onclick="edit_insert(\'[email]\',\'[/email]\');return false;" class="button" title="Email address [e]" tabindex="1008" accesskey="e">[email]</a>'
    + '<a href="#" onclick="edit_insert(\'\\n[quote]\',\'[/quote]\\n\');return false;" class="button" title="Quote [q]" tabindex="1009" accesskey="q">&quot;..&quot;</a>'
    + '<a href="#" onclick="edit_insert(\'\\n\\n[title]\',\'[/title]\\n\');return false;" class="button" title="Level 1 title [1]" tabindex="1010" accesskey="1">h1</a>'
    + '<a href="#" onclick="edit_insert(\'\\n\\n[subtitle]\',\'[/subtitle]\\n\');return false;" class="button" title="Level 2 title [2]" tabindex="1011" accesskey="2">h2</a>'
    + '</div><br />');