// snip.js Mike Schilli, m@perlmeister.com, 2005

// ##################################################
function topic_add(topic) {
// ##################################################
  var itemTable = document.getElementById("topics");
  var newRow    = document.createElement("TR");
  var newCol1   = document.createElement("TD");
  var newCol2   = document.createElement("TD");
  var input     = document.createElement("INPUT");

  if(topic.length == 0) {
      alert("No topic name specified.");
      return false;
  }

  input.name    = "r";
  input.type    = "radio";
  input.id      = topic;
  input.value   = topic;
  input.onclick = function() {
      display([topic], ['tarea', 'statusdiv']);
  };
  input.checked = 1;
  newCol1.appendChild(input);

  var textnode = document.createTextNode(topic);
  newCol2.appendChild(textnode);
    
  itemTable.appendChild(newRow);
  newRow.appendChild(newCol1);
  newRow.appendChild(newCol2);

  document.getElementById('tarea').value = "";
  document.getElementById('new_topic').value = "";

  return false;
}

// ##################################################
function topic_update() {
// ##################################################
  if(!id_selected()) {
    alert("Create a new topic first");
    return;
  }
  update_me( [ id_selected(), 'tarea' ], 
             'statusdiv');
}

// ##################################################
function topic_remove() {
// ##################################################
  var sel = id_selected();

  if(!sel) { alert("No topic available");
    return;
  }

  remove_me([sel], 'statusdiv');

  var node = document.getElementById(sel);
  var row  = node.parentNode.parentNode;
  row.parentNode.removeChild(row);
  select_first();
}

// ##################################################
function select_first() {
// ##################################################
  var form = document.getElementById("form");
  if(! form.r) { return; }
  if(! form.r.length) {
    form.r.checked = 1;
    if(! document.getElementById(id_selected()) ) {
       document.getElementById('tarea').value = "";
      return;
    }
    display([id_selected()], ['tarea', 'statusdiv']);
  }

  for(var i = 0; i < form.r.length; i++) {
    form.r[i].checked = 1;
    break;
  }
  display([id_selected()], ['tarea', 'statusdiv']);
}

// ##################################################
function id_selected() {
// ##################################################
  sel = id_selected_first_pass();

  if(! document.getElementById(sel) ) {
    document.getElementById('tarea').value = "";
    return;
  }
  return sel;
}

// ##################################################
function id_selected_first_pass() {
// ##################################################
  var form = document.getElementById("form");
  if(! form.r) { return 0; }
  if(! form.r.length) { return form.r.id; }

  for(var i = 0; i < form.r.length; i++) {
    if(form.r[i].checked) {
      return form.r[i].id;
    }
  }
  alert("Selected ID is unknown");
  return 0;
}