/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */

import com.sun.star.uno.UnoRuntime;
import com.sun.star.accessibility.XAccessible;
import com.sun.star.accessibility.XAccessibleContext;
import com.sun.star.accessibility.XAccessibleSelection;
import com.sun.star.lang.IndexOutOfBoundsException;



class AccessibleSelectionHandler
    extends NodeHandler
{
    @Override
    public NodeHandler createHandler( XAccessibleContext xContext )
    {
        XAccessibleSelection xSelection =
            UnoRuntime.queryInterface(
            XAccessibleSelection.class, xContext);
        return (xSelection == null) ? null :
            new AccessibleSelectionHandler(xSelection);
    }

    public AccessibleSelectionHandler()
    {
    }

    private AccessibleSelectionHandler( XAccessibleSelection xSelection )
    {
        if (xSelection != null)
            maChildList.setSize( 2 );
    }

    @Override
    public AccessibleTreeNode createChild( AccessibleTreeNode aParent,
                                           int nIndex )
    {
        if( !(aParent instanceof AccTreeNode) )
            return null;

        XAccessibleSelection xSelection = ((AccTreeNode)aParent).getSelection();
        if( xSelection == null )
            return null;

        AccessibleTreeNode aChild = null;

        switch( nIndex )
        {
            case 0:
                aChild = new StringNode(
                    "getSelectedAccessibleChildCount: " +
                    xSelection.getSelectedAccessibleChildCount(),
                    aParent );
                break;
            case 1:
            {
                VectorNode aVNode =
                    new VectorNode( "Selected Children", aParent);
                int nSelected = 0;
                int nCount = ((AccTreeNode)aParent).getContext().
                    getAccessibleChildCount();
                try
                {
                    for( int i = 0; i < nCount; i++ )
                    {
                        try
                        {
                            if( xSelection.isAccessibleChildSelected( i ) )
                            {
                                XAccessible xSelChild = xSelection.
                                    getSelectedAccessibleChild(nSelected);
                                XAccessible xNChild =
                                    ((AccTreeNode)aParent).
                                    getContext().getAccessibleChild( i );
                                aVNode.addChild( new StringNode(
                                    i + ": " +
                                    xNChild.getAccessibleContext().
                                    getAccessibleDescription() + " (" +
                                    (xSelChild.equals(xNChild) ? "OK" : "XXX") +
                                    ")", aParent ) );
                            }
                        }
                        catch (com.sun.star.lang.DisposedException e)
                        {
                            aVNode.addChild( new StringNode(
                                i + ": caught DisposedException while creating",
                                aParent ));
                        }
                    }
                    aChild = aVNode;
                }
                catch( IndexOutOfBoundsException e )
                {
                    aChild = new StringNode( "IndexOutOfBounds",
                                             aParent );
                }
            }
            break;
            default:
                aChild = new StringNode( "ERROR", aParent );
                break;
        }

        return aChild;
    }


    @Override
    public String[] getActions (AccessibleTreeNode aNode)
    {
        if( aNode instanceof AccTreeNode )
        {
            XAccessibleSelection xSelection =
                ((AccTreeNode)aNode).getSelection();
            if( xSelection != null )
            {
                return new String[] { "Select..." };
            }
        }
        return new String[0];
    }

    @Override
    public void performAction (AccessibleTreeNode aNode, int nIndex)
    {
        SelectionDialog selectionDialog = new SelectionDialog( (AccTreeNode)aNode );
        selectionDialog.setVisible(true);
    }
}
