/*************************************************************************
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * Copyright 2000, 2010 Oracle and/or its affiliates.
 *
 * OpenOffice.org - a multi-platform office productivity suite
 *
 * This file is part of OpenOffice.org.
 *
 * OpenOffice.org is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License version 3
 * only, as published by the Free Software Foundation.
 *
 * OpenOffice.org is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License version 3 for more details
 * (a copy is included in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU Lesser General Public License
 * version 3 along with OpenOffice.org.  If not, see
 * <http://www.openoffice.org/license.html>
 * for a copy of the LGPLv3 License.
 *
 ************************************************************************/

package com.sun.star.wiki;

import com.sun.star.uno.Any;
import com.sun.star.awt.XDialog;
import com.sun.star.awt.XCallback;
import com.sun.star.awt.XMessageBox;
import com.sun.star.awt.XRequestCallback;
import com.sun.star.lang.XMultiComponentFactory;
import com.sun.star.uno.UnoRuntime;
import com.sun.star.uno.XComponentContext;

public class MainThreadDialogExecutor implements XCallback
{
    private WikiDialog m_aWikiDialog;
    private XDialog    m_xDialog;
    private XMessageBox m_xMessageBox;
    private boolean    m_bResult = false;
    private boolean    m_bCalled = false;
    private boolean    m_bClose = false;

    static public boolean Show( XComponentContext xContext, WikiDialog aWikiDialog )
    {
        MainThreadDialogExecutor aExecutor = new MainThreadDialogExecutor( aWikiDialog );
        return GetCallback( xContext, aExecutor );
    }

    static public boolean Execute( XComponentContext xContext, XDialog xDialog )
    {
        MainThreadDialogExecutor aExecutor = new MainThreadDialogExecutor( xDialog );
        return GetCallback( xContext, aExecutor );
    }

    static public boolean Execute( XComponentContext xContext, XMessageBox xMessageBox )
    {
        MainThreadDialogExecutor aExecutor = new MainThreadDialogExecutor( xMessageBox );
        return GetCallback( xContext, aExecutor );
    }

    static public boolean Close( XComponentContext xContext, XDialog xDialog )
    {
        MainThreadDialogExecutor aExecutor = new MainThreadDialogExecutor( xDialog, true );
        return GetCallback( xContext, aExecutor );
    }

    static private boolean GetCallback( XComponentContext xContext, MainThreadDialogExecutor aExecutor )
    {
        try
        {
            if ( aExecutor != null )
            {
                String aThreadName = null;
                Thread aCurThread = Thread.currentThread();
                if ( aCurThread != null )
                    aThreadName = aCurThread.getName();

                if ( aThreadName != null && aThreadName.equals( "com.sun.star.thread.WikiEditorSendingThread" ) )
                {
                    // the main thread should be accessed asynchronously
                    XMultiComponentFactory xFactory = xContext.getServiceManager();
                    if ( xFactory == null )
                        throw new com.sun.star.uno.RuntimeException();

                    XRequestCallback xRequest = (XRequestCallback)UnoRuntime.queryInterface(
                        XRequestCallback.class,
                        xFactory.createInstanceWithContext( "com.sun.star.awt.AsyncCallback", xContext ) );
                    if ( xRequest != null )
                    {
                        xRequest.addCallback( aExecutor, Any.VOID );
                        do
                        {
                            Thread.yield();
                        }
                        while( !aExecutor.m_bCalled );
                    }
                }
                else
                {
                    // handle it as a main thread
                    aExecutor.notify( Any.VOID );
                }
            }
        }
        catch( Exception e )
        {
            e.printStackTrace();
        }

        return aExecutor.GetResult();
    }

    private MainThreadDialogExecutor( WikiDialog aWikiDialog )
    {
        m_aWikiDialog = aWikiDialog;
    }

    private MainThreadDialogExecutor( XDialog xDialog )
    {
        m_xDialog = xDialog;
    }

    private MainThreadDialogExecutor( XDialog xDialog, boolean bClose )
    {
        m_xDialog = xDialog;
        m_bClose = true;
        m_bCalled = true; // no yielding, asynchronous closing
    }

    private MainThreadDialogExecutor( XMessageBox xMessageBox )
    {
        m_xMessageBox = xMessageBox;
    }

    private boolean GetResult()
    {
        return m_bResult;
    }

    public void notify( Object aData )
    {
        if ( m_aWikiDialog != null )
            m_bResult = m_aWikiDialog.show();
        else if ( m_xDialog != null )
        {
            if ( !m_bClose )
                m_bResult = ( m_xDialog.execute() == 1 );
            else
            {
                try
                {
                    m_xDialog.endExecute();
                }
                catch( Exception e )
                {
                    e.printStackTrace();
                }
                m_bResult = true;
            }
        }
        else if ( m_xMessageBox != null )
        {
            int nRes = m_xMessageBox.execute();
            m_bResult = ( nRes == com.sun.star.awt.MessageBoxCommand.OK
                          || nRes == com.sun.star.awt.MessageBoxCommand.YES );
        }

        m_bCalled = true;
    }
};