var reorder_state = {

  _: false,

  type: false,

  id: false,

  obj: false,

  over: false

}

function decir_admin_dragforum_start(e)

{

  document.onmouseup = decir_admin_dragforum_close;

  reorder_state.obj = this;

  reorder_state.over = this;

  reorder_state._ = true;

  if ( $dynano(this).hasClass('decir_forum') )

  {

    reorder_state.type = 'forum';

  }

  document.onmousemove = decir_admin_dragforum_onmouse;

  return false;

}

function decir_admin_dragforum_onmouse(e)

{

  setMousePos(e);

  // Determine threshold for moving the target

  var nodes = reorder_state.obj.parentNode.parentNode.childNodes;

  var threshold = new Object();

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

  {

    var node = nodes[i];

    if ( node.tagName == 'TR' && node.DecirForumID )

    {

      // This is a row with a forum in it - add to the threshold list.

      var t = $(node).Top();

      var h = $(node).Height();

      threshold[node.DecirForumID] = t + ( h / 2 );

    }

  }

  // Move the bar if mouseY is lower than the threshold for the next cell up or higher (lower on screen) than the next cell down.

  var moveme = false;

  var current_threshold = threshold[ reorder_state.over.parentNode.DecirForumID ];

  var next_threshold = threshold[ parseInt(reorder_state.over.parentNode.DecirForumID) + 1 ];

  if ( !next_threshold )

    next_threshold = -1;

  // window.console.debug('current ', current_threshold, ' next ', next_threshold);

  if ( mouseY < current_threshold )

  {

    var prev_tr = reorder_state.over.parentNode.previousSibling;

    if ( !prev_tr )

      // already at the top

      return false;

    // find the prev_td

    var i = 0;

    var prev_td;

    while ( true )

    {

      prev_td = prev_tr.childNodes[i];

      if ( !prev_td )

        continue;

      if ( prev_td.tagName == 'TD' || i == 10000 )

        break;

      i++;

    }

    if ( prev_td.tagName != 'TD' )

      return false;

    reorder_state.over.style.borderBottom = null;

    reorder_state.over = prev_td;

    reorder_state.over.style.borderBottom = '5px solid #000000';

  }

  else if ( mouseY > next_threshold && next_threshold > -1 )

  {

    var next_tr = reorder_state.over.parentNode.nextSibling;

    if ( !next_tr )

      // already at the top

      return false;

    // find the next_td

    var i = 0;

    var next_td;

    while ( true )

    {

      next_td = next_tr.childNodes[i];

      if ( i >= 100 )

        break;

      if ( !next_td )

      {

        i++;

        continue;

      }

      if ( next_td.tagName == 'TD' || i == 100 )

        break;

      i++;

    }

    if ( !next_td )

      return false;

    if ( next_td.tagName != 'TD' )

      return false;

    reorder_state.over.style.borderBottom = null;

    reorder_state.over = next_td;

    reorder_state.over.style.borderBottom = '5px solid #000000';

  }

}

function decir_admin_dragforum_reset(e)

{

  var cls = ( reorder_state.type == 'forum' ? 'decir_forum' : 'decir_category' ); 

  var forums = getElementsByClassName(document, '*', cls);

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

  {

    forums[i].onmousedown = decir_admin_dragforum_start;

    forums[i].style.cursor = 'move';

    forums[i].style.borderBottom = null;

  }

}

function decir_admin_dragforum_close(e)

{

  document.onmousemove = function(e) {

    setMousePos(e);

  }

  document.onmouseup = function() {};

  decir_admin_dragforum_reset(e);

  reorder_state._ = false;

  // Move the row (or rather copy and delete)

  var newnode = reorder_state.obj.parentNode.cloneNode(true);

  insertAfter(reorder_state.obj.parentNode.parentNode, newnode, reorder_state.over.parentNode);

  reorder_state.obj.parentNode.parentNode.removeChild(reorder_state.obj.parentNode);

  // for some reason this needs to be called again in gecko (to reinit some values)

  decir_admin_dragforum_onload();

  var idlist = [];

  var forums = getElementsByClassName(document, '*', 'decir_forum');

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

  {

    idlist.push(forums[i].parentNode.DecirForumID);

  }

  idlist = implode(',', idlist);

  $('forum_order').object.value = idlist;

}

var decir_admin_dragforum_onload = function(e)

{

  var forums = getElementsByClassName(document, '*', 'decir_forum');

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

  {

    forums[i].onmousedown = decir_admin_dragforum_start;

    forums[i].style.cursor = 'move';

    forums[i].parentNode.DecirForumID = forums[i].firstChild.value;

    forums[i].title = 'Click and drag to re-order this forum';

  }

  var forums = getElementsByClassName(document, '*', 'decir_category');

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

  {

    //forums[i].onmousedown = decir_admin_dragforum_start;

    //forums[i].style.cursor = 'move';

    //forums[i].parentNode.DecirForumID = forums[i].firstChild.value;

  }

}

addOnloadHook(decir_admin_dragforum_onload);