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/*

 * FCKeditor - The text editor for internet

 * Copyright (C) 2003-2005 Frederico Caldeira Knabben

 *

 * Licensed under the terms of the GNU Lesser General Public License:

 * 		http://www.opensource.org/licenses/lgpl-license.php

 *

 * For further information visit:

 * 		http://www.fckeditor.net/

 *

 * File Name: fcktablehandler.js

 * 	Manage table operations.

 *

 * File Authors:

 * 		Frederico Caldeira Knabben (fredck@fckeditor.net)

 */

var FCKTableHandler = new Object() ;

FCKTableHandler.InsertRow = function()

{

	// Get the row where the selection is placed in.

	var oRow = FCKSelection.MoveToAncestorNode("TR") ;

	if ( !oRow ) return ;

	// Create a clone of the row.

	var oNewRow = oRow.cloneNode( true ) ;

	// Insert the new row (copy) before of it.

	oRow.parentNode.insertBefore( oNewRow, oRow ) ;

	// Clean the row (it seems that the new row has been added after it).

	FCKTableHandler.ClearRow( oRow ) ;

}

FCKTableHandler.DeleteRows = function( row )

{

	// If no row has been passed as a parameer,

	// then get the row where the selection is placed in.

	if ( !row )

		row = FCKSelection.MoveToAncestorNode("TR") ;

	if ( !row ) return ;

	// Get the row's table.

	var oTable = FCKTools.GetElementAscensor( row, 'TABLE' ) ;

	// If just one row is available then delete the entire table.

	if ( oTable.rows.length == 1 )

	{

		FCKTableHandler.DeleteTable( oTable ) ;

		return ;

	}

	// Delete the row.

	row.parentNode.removeChild( row ) ;

}

FCKTableHandler.DeleteTable = function( table )

{

	// If no table has been passed as a parameer,

	// then get the table where the selection is placed in.

	if ( !table )

		table = FCKSelection.MoveToAncestorNode("TABLE") ;

	if ( !table ) return ;

	// Delete the table.

	table.parentNode.removeChild( table ) ;

}

FCKTableHandler.InsertColumn = function()

{

	// Get the cell where the selection is placed in.

	var oCell = FCKSelection.MoveToAncestorNode("TD") ;

	if ( !oCell ) return ;

	// Get the cell's table.

	var oTable = FCKTools.GetElementAscensor( oCell, 'TABLE' ) ;

	// Get the index of the column to be created (based on the cell).

	var iIndex = oCell.cellIndex + 1 ;

	// Loop throw all rows available in the table.

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

	{

		// Get the row.

		var oRow = oTable.rows[i] ;

		// If the row doens't have enought cells, ignore it.

		if ( oRow.cells.length < iIndex )

			continue ;

		// Create the new cell element to be added.

		oCell = FCK.EditorDocument.createElement('TD') ;

		if ( FCKBrowserInfo.IsGecko )

			oCell.innerHTML = '<br _moz_editor_bogus_node="TRUE">' ;

//		oCell.innerHTML = ' ' ;

		// Get the cell that is placed in the new cell place.

		var oBaseCell = oRow.cells[iIndex] ;

		// If the cell is available (we are not in the last cell of the row).

		if ( oBaseCell )

		{

			// Insert the new cell just before of it.

			oRow.insertBefore( oCell, oBaseCell ) ;

		}

		else

		{

			// Append the cell at the end of the row.

			oRow.appendChild( oCell ) ;

		}

	}

}

FCKTableHandler.DeleteColumns = function()

{

	// Get the cell where the selection is placed in.

	var oCell = FCKSelection.MoveToAncestorNode("TD") ;

	if ( !oCell ) return ;

	// Get the cell's table.

	var oTable = FCKTools.GetElementAscensor( oCell, 'TABLE' ) ;

	// Get the cell index.

	var iIndex = oCell.cellIndex ;

	// Loop throw all rows (from down to up, because it's possible that some

	// rows will be deleted).

	for ( var i = oTable.rows.length - 1 ; i >= 0 ; i-- )

	{

		// Get the row.

		var oRow = oTable.rows[i] ;

		// If the cell to be removed is the first one and the row has just one cell.

		if ( iIndex == 0 && oRow.cells.length == 1 )

		{

			// Remove the entire row.

			FCKTableHandler.DeleteRows( oRow ) ;

			continue ;

		}

		// If the cell to be removed exists the delete it.

		if ( oRow.cells[iIndex] )

			oRow.removeChild( oRow.cells[iIndex] ) ;

	}

}

FCKTableHandler.InsertCell = function( cell )

{

	// Get the cell where the selection is placed in.

	var oCell = cell ? cell : FCKSelection.MoveToAncestorNode("TD") ;

	if ( !oCell ) return ;

	// Create the new cell element to be added.

	var oNewCell = FCK.EditorDocument.createElement("TD");

	if ( FCKBrowserInfo.IsGecko )

		oNewCell.innerHTML = '<br _moz_editor_bogus_node="TRUE">' ;

//	oNewCell.innerHTML = " " ;

	// If it is the last cell in the row.

	if ( oCell.cellIndex == oCell.parentNode.cells.lenght - 1 )

	{

		// Add the new cell at the end of the row.

		oCell.parentNode.appendChild( oNewCell ) ;

	}

	else

	{

		// Add the new cell before the next cell (after the active one).

		oCell.parentNode.insertBefore( oNewCell, oCell.nextSibling ) ;

	}

	return oNewCell ;

}

FCKTableHandler.DeleteCell = function( cell )

{

	// If this is the last cell in the row.

	if ( cell.parentNode.cells.length == 1 )

	{

		// Delete the entire row.

		FCKTableHandler.DeleteRows( FCKTools.GetElementAscensor( cell, 'TR' ) ) ;

		return ;

	}

	// Delete the cell from the row.

	cell.parentNode.removeChild( cell ) ;

}

FCKTableHandler.DeleteCells = function()

{

	var aCells = FCKTableHandler.GetSelectedCells() ;

	for ( var i = aCells.length - 1 ; i >= 0  ; i-- )

	{

		FCKTableHandler.DeleteCell( aCells[i] ) ;

	}

}

FCKTableHandler.MergeCells = function()

{

	// Get all selected cells.

	var aCells = FCKTableHandler.GetSelectedCells() ;

	// At least 2 cells must be selected.

	if ( aCells.length < 2 )

		return ;

	// The merge can occour only if the selected cells are from the same row.

	if ( aCells[0].parentNode != aCells[aCells.length-1].parentNode )

		return ;

	// Calculate the new colSpan for the first cell.

	var iColSpan = isNaN( aCells[0].colSpan ) ? 1 : aCells[0].colSpan ;

	var sHtml = '' ;

	for ( var i = aCells.length - 1 ; i > 0  ; i-- )

	{

		iColSpan += isNaN( aCells[i].colSpan ) ? 1 : aCells[i].colSpan ;

		// Append the HTML of each cell.

		sHtml = aCells[i].innerHTML + sHtml ;

		// Delete the cell.

		FCKTableHandler.DeleteCell( aCells[i] ) ;

	}

	// Set the innerHTML of the remaining cell (the first one).

	aCells[0].colSpan = iColSpan ;

	aCells[0].innerHTML += sHtml ;

}

FCKTableHandler.SplitCell = function()

{

	// Check that just one cell is selected, otherwise return.

	var aCells = FCKTableHandler.GetSelectedCells() ;

	if ( aCells.length != 1 )

		return ;

	var aMap = this._CreateTableMap( aCells[0].parentNode.parentNode ) ;

	var iCellIndex = FCKTableHandler._GetCellIndexSpan( aMap, aCells[0].parentNode.rowIndex , aCells[0] ) ;

	var aCollCells = this._GetCollumnCells( aMap, iCellIndex ) ;

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

	{

		if ( aCollCells[i] == aCells[0] )

		{

			var oNewCell = this.InsertCell( aCells[0] ) ;

			if ( !isNaN( aCells[0].rowSpan ) && aCells[0].rowSpan > 1 )

				oNewCell.rowSpan = aCells[0].rowSpan ;

		}

		else

		{

			if ( isNaN( aCollCells[i].colSpan ) )

				aCollCells[i].colSpan = 2 ;

			else

				aCollCells[i].colSpan += 1 ;

		}

	}

}

// Get the cell index from a TableMap.

FCKTableHandler._GetCellIndexSpan = function( tableMap, rowIndex, cell )

{

	if ( tableMap.length < rowIndex + 1 )

		return ;

	var oRow = tableMap[ rowIndex ] ;

	for ( var c = 0 ; c < oRow.length ; c++ )

	{

		if ( oRow[c] == cell )

			return c ;

	}

}

// Get the cells available in a collumn of a TableMap.

FCKTableHandler._GetCollumnCells = function( tableMap, collumnIndex )

{

	var aCollCells = new Array() ;

	for ( var r = 0 ; r < tableMap.length ; r++ )

	{

		var oCell = tableMap[r][collumnIndex] ;

		if ( oCell && ( aCollCells.length == 0 || aCollCells[ aCollCells.length - 1 ] != oCell ) )

			aCollCells[ aCollCells.length ] = oCell ;

	}

	return aCollCells ;

}

// This function is quite hard to explain. It creates a matrix representing all cells in a table.

// The difference here is that the "spanned" cells (colSpan and rowSpan) are duplicated on the matrix

// cells that are "spanned". For example, a row with 3 cells where the second cell has colSpan=2 and rowSpan=3

// will produce a bi-dimensional matrix with the following values (representing the cells):

//		Cell1, Cell2, Cell2, Cell 3

//		Cell4, Cell2, Cell2, Cell 5

FCKTableHandler._CreateTableMap = function( table )

{

	var aRows = table.rows ;

	// Row and Collumn counters.

	var r = -1 ;

	var aMap = new Array() ;

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

	{

		r++ ;

		if ( !aMap[r] )

			aMap[r] = new Array() ;

		var c = -1 ;

		for ( var j = 0 ; j < aRows[i].cells.length ; j++ )

		{

			var oCell = aRows[i].cells[j] ;

			c++ ;

			while ( aMap[r][c] )

				c++ ;

			var iColSpan = isNaN( oCell.colSpan ) ? 1 : oCell.colSpan ;

			var iRowSpan = isNaN( oCell.rowSpan ) ? 1 : oCell.rowSpan ;

			for ( var rs = 0 ; rs < iRowSpan ; rs++ )

			{

				if ( !aMap[r + rs] )

					aMap[r + rs] = new Array() ;

				for ( var cs = 0 ; cs < iColSpan ; cs++ )

				{

					aMap[r + rs][c + cs] = aRows[i].cells[j] ;

				}

			}

			c += iColSpan - 1 ;

		}

	}

	return aMap ;

}

FCKTableHandler.ClearRow = function( tr )

{

	// Get the array of row's cells.

	var aCells = tr.cells ;

	// Replace the contents of each cell with "nothing".

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

	{

		if ( FCKBrowserInfo.IsGecko )

			aCells[i].innerHTML = '<br _moz_editor_bogus_node="TRUE">' ;

		else

			aCells[i].innerHTML = '' ;

	}

}