/*

 * Expandable fieldsets

 */

var expander_onload = function()

{

  var sets = document.getElementsByTagName('fieldset');

  if ( sets.length < 1 )

    return false;

  var init_us = [];

  for ( var index = 0; index < sets.length; index++ )

  {

    var mode = sets[index].getAttribute('enano:expand');

    if ( mode == 'closed' || mode == 'open' )

    {

      init_us.push(sets[index]);

    }

  }

  for ( var k = 0; k < init_us.length; k++ )

  {

    expander_init_element(init_us[k]);

  }

}

function expander_init_element(el)

{

  // get the legend tag

  var legend = el.getElementsByTagName('legend')[0];

  if ( !legend )

    return false;

  // existing content

  var existing_inner = legend.innerHTML;

  // blank the innerHTML and replace it with a link

  legend.innerHTML = '';

  var button = document.createElement('a');

  button.className = 'expander expander-open';

  button.innerHTML = existing_inner;

  button.href = '#';

  legend.appendChild(button);

  button.onclick = function()

  {

    try

    {

      expander_handle_click(this);

    }

    catch(e)

    {

      console.debug('Exception caught: ', e);

    }

    return false;

  }

  if ( el.getAttribute('enano:expand') == 'closed' )

  {

    expander_close(el);

  }

}

function expander_handle_click(el)

{

  if ( el.parentNode.parentNode.tagName != 'FIELDSET' )

    return false;

  var parent = el.parentNode.parentNode;

  if ( parent.getAttribute('enano:expand') == 'closed' )

  {

    expander_open(parent);

  }

  else

  {

    expander_close(parent);

  }

}

function expander_close(el)

{

  var children = el.childNodes;

  for ( var i = 0; i < children.length; i++ )

  {

    var child = children[i];

    if ( child.tagName == 'LEGEND' )

    {

      var a = child.getElementsByTagName('a')[0];

      $(a).rmClass('expander-open');

      $(a).addClass('expander-closed');

      continue;

    }

    if ( child.style )

    {

      child.expander_meta_old_state = child.style.display;

      child.style.display = 'none';

    }

  }

  el.expander_meta_padbak = el.style.padding;

  el.setAttribute('enano:expand', 'closed');

}

function expander_open(el)

{

  var children = el.childNodes;

  for ( var i = 0; i < children.length; i++ )

  {

    var child = children[i];

    if ( child.tagName == 'LEGEND' )

    {

      var a = child.getElementsByTagName('a')[0];

      $(a).rmClass('expander-closed');

      $(a).addClass('expander-open');

      continue;

    }

    if ( child.expander_meta_old_state && child.style )

    {

      child.style.display = child.expander_meta_old_state;

      child.expander_meta_old_state = null;

    }

    else

    {

      if ( child.style )

      {

        child.style.display = null;

      }

    }

  }

  if ( el.expander_meta_padbak )

  {

    el.style.padding = el.expander_meta_padbak;

    el.expander_meta_padbak = null;

  }

  else

  {

    el.style.padding = null;

  }

  el.setAttribute('enano:expand', 'open');

}

addOnloadHook(expander_onload);