/**************************************************************
 * 
 * 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
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * 
 *************************************************************/


package com.sun.star.comp.beans;

import java.awt.Component;

import com.sun.star.lang.EventObject;
import com.sun.star.lang.SystemDependent;
import com.sun.star.lang.XEventListener;
import com.sun.star.lang.XMultiServiceFactory;
import com.sun.star.lang.XMultiComponentFactory;
import com.sun.star.awt.Rectangle;
import com.sun.star.awt.XWindow;
import com.sun.star.awt.XWindowPeer;
import com.sun.star.awt.XVclWindowPeer;
import com.sun.star.awt.XToolkit;
import com.sun.star.awt.WindowDescriptor;
import com.sun.star.awt.WindowAttribute;
import com.sun.star.awt.WindowClass;
import com.sun.star.uno.UnoRuntime;
import com.sun.star.uno.XComponentContext;
import com.sun.star.uno.Any;
import com.sun.star.uno.Type;
import com.sun.star.beans.NamedValue;

/**
 * This class represents a local office window. 
 *
 * @since OOo 2.0.0
 */
public class LocalOfficeWindow
	extends java.awt.Canvas
	implements OfficeWindow, XEventListener
{
	private transient OfficeConnection	mConnection;
	private transient XWindowPeer		mParentProxy;
	private transient XWindowPeer		mWindow;
	private boolean 			bPeer = false;

	/**
	 * Construnctor.
	 *
	 * @param connection The office connection object the window 
	 *	belongs to.
	 */
	protected LocalOfficeWindow(OfficeConnection connection)
	{
		mConnection	= connection;
		mConnection.addEventListener((XEventListener)this);
	}

	/**
	 * Retrives an AWT component object associated with the OfficeWindow.
	 *
	 * @return The AWT component object associated with the OfficeWindow.
	 */
	public Component getAWTComponent()
	{
		return this;
	}

	/**
	 * Retrives an UNO XWindowPeer object associated with the OfficeWindow.
	 *
	 * @return The UNO XWindowPeer object associated with the OfficeWindow.
	 */
	public XWindowPeer getUNOWindowPeer()
	{
		if (mWindow == null)
			createUNOWindowPeer();
		return mWindow;
	}

	/**
	 * Receives a notification about the connection has been closed.
	 * This method has to set the connection to <code>null</code>.
	 *
	 * @source The event object.
	 */
	public void disposing(EventObject source)
	{
		// the window will be disposed by the framework
		mWindow = null;
		mConnection	= null;
	}

	/**
	* Returns an AWT toolkit.
        */
       private XToolkit queryAWTToolkit()
               throws com.sun.star.uno.Exception 
       {
			// Create a UNO toolkit.
			XMultiComponentFactory  compfactory;
			XComponentContext xContext = mConnection.getComponentContext();
			if ( xContext != null )
			{
				compfactory     = mConnection.getComponentContext().getServiceManager();
				XMultiServiceFactory    factory;
				factory = (XMultiServiceFactory)UnoRuntime.queryInterface(
						XMultiServiceFactory.class, compfactory);
				Object          object  = factory.createInstance( "com.sun.star.awt.Toolkit");
				return (XToolkit)UnoRuntime.queryInterface(XToolkit.class, object);
			}
			else
				return null;
       }
 
       	/// called when system parent is available, reparents the bean window
	private synchronized void aquireSystemWindow()
	{
		if ( !bPeer )
		{
			// set real parent
			XVclWindowPeer xVclWindowPeer = (XVclWindowPeer)UnoRuntime.queryInterface(
                               XVclWindowPeer.class, mWindow);

			xVclWindowPeer.setProperty( "PluginParent", getWrappedWindowHandle());
			bPeer = true;
            // show document window
			XWindow aWindow = (XWindow)UnoRuntime.queryInterface(XWindow.class, mWindow);
			aWindow.setVisible( true );
		}
	}

       	/// called when system parent is about to die, reparents the bean window
	private synchronized void releaseSystemWindow()
	{
		if ( bPeer )
		{
		       	// hide document window
			XWindow aWindow = (XWindow)UnoRuntime.queryInterface(XWindow.class, mWindow);
			aWindow.setVisible( false );

			// set null parent
			XVclWindowPeer xVclWindowPeer = (XVclWindowPeer)UnoRuntime.queryInterface(
                               XVclWindowPeer.class, mWindow);
			xVclWindowPeer.setProperty( "PluginParent", new Long(0) );
			bPeer = false;
		}
	}


	/// Overriding java.awt.Component.setVisible() due to Java bug (no showing event).
	public void setVisible( boolean b )
	{
		super.setVisible(b);

		// Java-Bug: componentShown() is never called :-(
		// is still at least in Java 1.4.1_02
		if ( b )
			aquireSystemWindow();
		else
			releaseSystemWindow();
	}	
	 
       /** Factory method for a UNO AWT toolkit window as a child of this Java window.
	*
	*/
       private synchronized XWindowPeer createUNOWindowPeer()
       {
		try 
		{
			// get this windows native window type
            int type = getNativeWindowSystemType();

            // Java AWT windows only have a system window when showing.
            XWindowPeer parentPeer;
            if ( isShowing() )
            {
				// create direct parent relationship
				//setVisible( true );
                parentPeer = new JavaWindowPeerFake(getWrappedWindowHandle(), type);
				bPeer = true;
                        }
                        else
			{
				// no parent yet
				parentPeer = null;
				bPeer = false;
			}

			// create native window (mWindow)
			Rectangle aRect = new Rectangle( 0, 0, 20, 20 );
			WindowDescriptor desc = new WindowDescriptor();
			desc.Type = WindowClass.TOP;
			desc.Parent = parentPeer;
			desc.Bounds = aRect;
			desc.WindowServiceName = "workwindow";
			desc.WindowAttributes = (type == SystemDependent.SYSTEM_WIN32)	
				? WindowAttribute.SHOW : 0;
			mWindow	= queryAWTToolkit().createWindow(desc);


			// set initial visibility
            XWindow aWindow = (XWindow)UnoRuntime.queryInterface(XWindow.class, mWindow);
			aWindow.setVisible( bPeer );
		} 
		catch (com.sun.star.uno.Exception exp) {
		}

		return mWindow;
	}
    /** We make sure that the office window is notified that the parent
     *  will be removed.
     */   
    public void removeNotify()
    {
        try {
            releaseSystemWindow();
        } catch (java.lang.Exception e) {
            System.err.println("LocaleOfficeWindow.removeNotify: Exception in releaseSystemWindow.");
            System.err.println(e.getMessage());
            e.printStackTrace(System.err);
        }
        super.removeNotify();
    }

	/**
	 * Retrives a platform dependent system window identifier.
	 *
	 * @return The system window identifier.
	 */
    private native long getNativeWindow();

	/**
	 * Retrives a platform dependent system window type.
	 *
	 * @return The system window type.
	 */
	private native int getNativeWindowSystemType();

    /**
    Returns an Any containing a sequences of com.sun.star.beans.NamedValue. One NamedValue
    contains the name "WINDOW" and the value is a Long representing the window handle.
    The second NamedValue  has the name "XEMBED" and the value is true, when the XEmbed
    protocol shall be used fore embedding the native Window.
    */
    protected Any getWrappedWindowHandle()
    {
                
        NamedValue window = new NamedValue(
            "WINDOW", new Any(new Type(Long.class), new Long(getNativeWindow())));
        NamedValue xembed = new NamedValue(
            "XEMBED", new Any(new Type(Boolean.class), new Boolean(false)));

        if (getNativeWindowSystemType() == SystemDependent.SYSTEM_XWINDOW )
        {
            String vendor = System.getProperty("java.vendor");
            if (vendor.equals("Sun Microsystems Inc.")
                && Boolean.valueOf(System.getProperty("sun.awt.xembedserver")).booleanValue())
            {
                xembed = new NamedValue(
                    "XEMBED",
                    new Any(new Type(Boolean.class), new Boolean(true)));
            }
        }
        return new Any(
            new Type("[]com.sun.star.beans.NamedValue"),
            new NamedValue[] {window, xembed});
    }

}