// <nowiki><pre>
if ( ( mw.config.get('wgAction') == "submit" || mw.config.get('wgAction') == "edit" ) && mw.config.get('wgNamespaceNumber') == 0 ) {
  addOnloadHook ( init_tmpl ) ;
}

var tmpl_active = 0 ;
var tmpl_original = '' ;
var tmpl_template_texts = new Array () ;
var tmpl_keys = new Array () ;

function init_tmpl () {
  tmpl_hook_button ( 'wpSave' ) ;
  tmpl_hook_button ( 'wpPreview' ) ;
  tmpl_hook_button ( 'wpDiff' ) ;
  tmpl_parse_textbox () ;
}

function tmpl_hook_button ( id ) {
  var b = document.getElementById ( id ) ;
  b.onclick = function () { tmpl_rejoin() ; return true ; } ;
}

function tmpl_rejoin () {
  if ( tmpl_active == 0 ) return ;
  var tb = document.getElementById('wpTextbox1') ;
  var all = tb.value ;
  for ( var akey in tmpl_keys ) {
    var key = tmpl_keys[akey] ;
    if ( null == key.match ( /^##TEMPLATE\d+:/ ) ) continue ;
    var text = tmpl_template_texts[akey] ;
    all = all.split(key).join("{{"+text+"}}");
  }
  tmpl_active = 0 ;
  tb.value = all ;
}

function tmpl_parse_textbox () {
  if ( tmpl_active == 1 ) return ;
  tmpl_active = 1 ;
  var tb = document.getElementById('wpTextbox1') ;
  tmpl_original = tb.value ;
  var tcnt = 0 ;
  var ts = '' ;
  var ns = '' ;
  var curt = 0 ;
  for ( var a = 0 ; a < tmpl_original.length ; a++ ) {
    if ( tmpl_original[a] == '{' && tmpl_original[a+1] == '{' ) {
      tcnt++ ;
      a++ ;
      if ( tcnt > 1 ) ts += '{{' ;
    } else if ( tmpl_original[a] == '}' && tmpl_original[a+1] == '}' ) {
      if ( tcnt > 1 ) ts += '}}' ;
      if ( tcnt > 0 ) tcnt-- ;
      if ( tcnt == 0 ) {
        if ( 1 == ts.split('\|').length ) { // Just a simple template, no parameters
          ns += "{{" + ts + "}}" ;
        } else {
          curt++ ;
          var tname = tmpl_get_template_name ( ts ) ;
          var key1 = "##TEMPLATE" + curt + ":" + tname + "##" ;
          tmpl_keys[curt] = key1 ;
          ns += key1 ;
          tmpl_template_texts[curt] = ts ;
        }
        ts = '' ;
      }
      a++ ;
    } else {
      if ( tcnt == 0 ) {
        ns += tmpl_original[a] ;
      } else {
        ts += tmpl_original[a] ;
      }
    }
  }
  tb.value = ns ;
  tb.ondblclick = tmpl_textbox_dblclick ;
}

function tmpl_get_template_name ( text ) {
  text = text.split('\|').shift() ;
  text = text.split('\{').shift() ;
  text = text.replace ( /\s+$/ , '' ) ;
  text = text.replace ( /^\s+/ , '' ) ;
  return text ;
}

function tmpl_textbox_dblclick () {
  var tb = document.getElementById('wpTextbox1') ;
  var len = tb.value.length;
  var start = tb.selectionStart-2;
  var end = tb.selectionEnd+1;
  if ( start < 0 ) return ;
  if ( end >= tb.value.length ) return ;
  var sel = tb.value.substring(start, end);

  if ( null == sel.match ( /^##TEMPLATE\d+:$/ ) ) return ;

  var num = sel.match ( /\d+/ ) ;
  var text = tmpl_template_texts[num] ;

  alert ( num + " stands for:\n" + text ) ;
}
// </pre></nowiki>