// Register the related command.
FCKCommands.RegisterCommand( 'Placeholder', new FCKDialogCommand( 'Placeholder', FCKLang.PlaceholderDlgTitle, FCKPlugins.Items['placeholder'].Path + 'fck_placeholder.html', 340, 170 ) ) ;

// Create the "Plaholder" toolbar button.
var oPlaceholderItem = new FCKToolbarButton( 'Placeholder', FCKLang.PlaceholderBtn ) ;
oPlaceholderItem.IconPath = FCKPlugins.Items['placeholder'].Path + 'placeholder.gif' ;
FCKToolbarItems.RegisterItem( 'Placeholder', oPlaceholderItem ) ;


// The object used for all Placeholder operations.
var FCKPlaceholders = new Object() ;

// Add a new placeholder at the actual selection.
FCKPlaceholders.Add = function( name )
{
  var oSpan = FCK.CreateElement( 'SPAN' ) ;
  this.SetupSpan( oSpan, name ) ;
}

FCKPlaceholders.SetupSpan = function( span, name )
{
  span.innerHTML = '[[ ' + name + ' ]]' ;

	span.style.backgroundColor = '#ffff00' ;
	span.style.color = '#000000' ;

	if ( FCKBrowserInfo.IsGecko )
    span.style.cursor = 'default' ;

	span._fckplaceholder = name ;
	span.contentEditable = false ;

  // To avoid it to be resized.
  span.onresizestart = function()
  {
    FCK.EditorWindow.event.returnValue = false ;
    return false ;
  }
}

// On Gecko we must do this trick so the user select all the SPAN when clicking on it.
FCKPlaceholders._SetupClickListener = function()
{
  FCKPlaceholders._ClickListener = function( e )
  {
    if ( e.target.tagName == 'SPAN' && e.target._fckplaceholder )
      FCKSelection.SelectNode( e.target ) ;
  }

  FCK.EditorDocument.addEventListener( 'click', FCKPlaceholders._ClickListener, true ) ;
}

// Open the Placeholder dialog on double click.
FCKPlaceholders.OnDoubleClick = function( span )
{
  if ( span.tagName == 'SPAN' && span._fckplaceholder )
    FCKCommands.GetCommand( 'Placeholder' ).Execute() ;
}

FCK.RegisterDoubleClickHandler( FCKPlaceholders.OnDoubleClick, 'SPAN' ) ;

// Check if a Placholder name is already in use.
FCKPlaceholders.Exist = function( name )
{
  var aSpans = FCK.EditorDocument.getElementsByTagName( 'SPAN' )

  for ( var i = 0 ; i < aSpans.length ; i++ )
  {
    if ( aSpans[i]._fckplaceholder == name )
      return true ;
  }
}

if ( FCKBrowserInfo.IsIE )
{
  FCKPlaceholders.Redraw = function()
  {
    var aPlaholders = FCK.EditorDocument.body.innerText.match( /\[\[[^\[\]]+\]\]/g ) ;
    if ( !aPlaholders )
      return ;

    var oRange = FCK.EditorDocument.body.createTextRange() ;

    for ( var i = 0 ; i < aPlaholders.length ; i++ )
    {
      if ( oRange.findText( aPlaholders[i] ) )
      {
        var sName = aPlaholders[i].match( /\[\[\s*([^\]]*?)\s*\]\]/ )[1] ;
        oRange.pasteHTML( '<span style="color: #000000; background-color: #ffff00" contenteditable="false" _fckplaceholder="' + sName + '">' + aPlaholders[i] + '</span>' ) ;
      }
    }
  }
}
else
{
  FCKPlaceholders.Redraw = function()
  {
    var oInteractor = FCK.EditorDocument.createTreeWalker( FCK.EditorDocument.body, NodeFilter.SHOW_TEXT, FCKPlaceholders._AcceptNode, true ) ;

    var	aNodes = new Array() ;

    while ( oNode = oInteractor.nextNode() )
    {
      aNodes[ aNodes.length ] = oNode ;
    }

    for ( var n = 0 ; n < aNodes.length ; n++ )
    {
      var aPieces = aNodes[n].nodeValue.split( /(\[\[[^\[\]]+\]\])/g ) ;

      for ( var i = 0 ; i < aPieces.length ; i++ )
      {
        if ( aPieces[i].length > 0 )
        {
          if ( aPieces[i].indexOf( '[[' ) == 0 )
          {
            var sName = aPieces[i].match( /\[\[\s*([^\]]*?)\s*\]\]/ )[1] ;

            var oSpan = FCK.EditorDocument.createElement( 'span' ) ;
            FCKPlaceholders.SetupSpan( oSpan, sName ) ;

            aNodes[n].parentNode.insertBefore( oSpan, aNodes[n] ) ;
          }
          else
            aNodes[n].parentNode.insertBefore( FCK.EditorDocument.createTextNode( aPieces[i] ) , aNodes[n] ) ;
        }
      }

      aNodes[n].parentNode.removeChild( aNodes[n] ) ;
    }
    
    FCKPlaceholders._SetupClickListener() ;
  }

  FCKPlaceholders._AcceptNode = function( node )
  {
    if ( /\[\[[^\[\]]+\]\]/.test( node.nodeValue ) )
      return NodeFilter.FILTER_ACCEPT ;
    else
      return NodeFilter.FILTER_SKIP ;
  }
}

FCK.Events.AttachEvent( 'OnAfterSetHTML', FCKPlaceholders.Redraw ) ;

// The "Redraw" method must be called on startup.
FCKPlaceholders.Redraw() ;

// We must process the SPAN tags to replace then with the real resulting value of the placeholder.
FCKXHtml.TagProcessors['span'] = function( node, htmlNode )
{
  if ( htmlNode._fckplaceholder )
    node = FCKXHtml.XML.createTextNode( '[[' + htmlNode._fckplaceholder + ']]' ) ;
  else
    FCKXHtml._AppendChildNodes( node, htmlNode, false ) ;

  return node ;
}
