/*

 * Copyright 2003-2005 Sun Microsystems, Inc.  All Rights Reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun in the LICENSE file that accompanied this code.

 *

 * This code 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 General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

package sun.awt.X11;

import java.awt.datatransfer.Transferable;

import java.awt.dnd.DnDConstants;

import java.awt.dnd.InvalidDnDOperationException;

import java.util.Map;

import java.util.logging.*;

import sun.misc.Unsafe;

/**

 * XDragSourceProtocol implementation for XDnD protocol.

 *

 * @since 1.5

 */

class XDnDDragSourceProtocol extends XDragSourceProtocol {

    private static final Logger logger =

        Logger.getLogger("sun.awt.X11.xembed.xdnd.XDnDDragSourceProtocol");

    private static final Unsafe unsafe = XlibWrapper.unsafe;

    protected XDnDDragSourceProtocol(XDragSourceProtocolListener listener) {

        super(listener);

    }

    /**

     * Creates an instance associated with the specified listener.

     *

     * @throws NullPointerException if listener is <code>null</code>.

     */

    static XDragSourceProtocol createInstance(XDragSourceProtocolListener listener) {

        return new XDnDDragSourceProtocol(listener);

    }

    public String getProtocolName() {

        return XDragAndDropProtocols.XDnD;

    }

    /**

     * Performs protocol-specific drag initialization.

     *

     * @returns true if the initialized successfully.

     */

    protected void initializeDragImpl(int actions, Transferable contents,

                                         Map formatMap, long[] formats)

      throws InvalidDnDOperationException,

        IllegalArgumentException, XException {

        assert XToolkit.isAWTLockHeldByCurrentThread();

        long window = XDragSourceProtocol.getDragSourceWindow();

        long data = Native.allocateLongArray(3);

        int action_count = 0;

        try {

            if ((actions & DnDConstants.ACTION_COPY) != 0) {

                Native.putLong(data, action_count,

                               XDnDConstants.XA_XdndActionCopy.getAtom());

                action_count++;

            }

            if ((actions & DnDConstants.ACTION_MOVE) != 0) {

                Native.putLong(data, action_count,

                               XDnDConstants.XA_XdndActionMove.getAtom());

                action_count++;

            }

            if ((actions & DnDConstants.ACTION_LINK) != 0) {

                Native.putLong(data, action_count,

                               XDnDConstants.XA_XdndActionLink.getAtom());

                action_count++;

            }

            XToolkit.WITH_XERROR_HANDLER(XWM.VerifyChangePropertyHandler);

            XDnDConstants.XA_XdndActionList.setAtomData(window,

                                                        XAtom.XA_ATOM,

                                                        data, action_count);

            XToolkit.RESTORE_XERROR_HANDLER();

            if (XToolkit.saved_error != null &&

                XToolkit.saved_error.get_error_code() != XlibWrapper.Success) {

                cleanup();

                throw new XException("Cannot write XdndActionList property");

            }

        } finally {

            unsafe.freeMemory(data);

            data = 0;

        }

        data = Native.allocateLongArray(formats.length);

        try {

            Native.put(data, formats);

            XToolkit.WITH_XERROR_HANDLER(XWM.VerifyChangePropertyHandler);

            XDnDConstants.XA_XdndTypeList.setAtomData(window,

                                                      XAtom.XA_ATOM,

                                                      data, formats.length);

            XToolkit.RESTORE_XERROR_HANDLER();

            if (XToolkit.saved_error != null &&

                XToolkit.saved_error.get_error_code() != XlibWrapper.Success) {

                cleanup();

                throw new XException("Cannot write XdndActionList property");

            }

        } finally {

            unsafe.freeMemory(data);

            data = 0;

        }

        if (!XDnDConstants.XDnDSelection.setOwner(contents, formatMap, formats,

                                                  XlibWrapper.CurrentTime)) {

            cleanup();

            throw new InvalidDnDOperationException("Cannot acquire selection ownership");

        }

    }

    private boolean processXdndStatus(XClientMessageEvent xclient) {

        int action = DnDConstants.ACTION_NONE;

        /* Ignore XDnD messages from all other windows. */

        if (xclient.get_data(0) != getTargetWindow()) {

            return true;

        }

        if ((xclient.get_data(1) & XDnDConstants.XDND_ACCEPT_DROP_FLAG) != 0) {

            /* This feature is new in XDnD version 2, but we can use it as XDnD

               compliance only requires supporting version 3 and up. */

            action = XDnDConstants.getJavaActionForXDnDAction(xclient.get_data(4));

        }

        getProtocolListener().handleDragReply(action);

        return true;

    }

    private boolean processXdndFinished(XClientMessageEvent xclient) {

        /* Ignore XDnD messages from all other windows. */

        if (xclient.get_data(0) != getTargetWindow()) {

            return true;

        }

        if (getTargetProtocolVersion() >= 5) {

            boolean success = (xclient.get_data(1) & XDnDConstants.XDND_ACCEPT_DROP_FLAG) != 0;

            int action = XDnDConstants.getJavaActionForXDnDAction(xclient.get_data(2));

            getProtocolListener().handleDragFinished(success, action);

        } else {

            getProtocolListener().handleDragFinished();

        }

        finalizeDrop();

        return true;

    }

    public boolean processClientMessage(XClientMessageEvent xclient) {

        if (xclient.get_message_type() == XDnDConstants.XA_XdndStatus.getAtom()) {

            return processXdndStatus(xclient);

        } else if (xclient.get_message_type() == XDnDConstants.XA_XdndFinished.getAtom()) {

            return processXdndFinished(xclient);

        } else {

            return false;

        }

    }

    public TargetWindowInfo getTargetWindowInfo(long window) {

        assert XToolkit.isAWTLockHeldByCurrentThread();

        WindowPropertyGetter wpg1 =

            new WindowPropertyGetter(window, XDnDConstants.XA_XdndAware, 0, 1,

                                     false, XlibWrapper.AnyPropertyType);

        int status = wpg1.execute(XToolkit.IgnoreBadWindowHandler);

        if (status == XlibWrapper.Success &&

            wpg1.getData() != 0 && wpg1.getActualType() == XAtom.XA_ATOM) {

            int targetVersion = (int)Native.getLong(wpg1.getData());

            wpg1.dispose();

            if (targetVersion >= XDnDConstants.XDND_MIN_PROTOCOL_VERSION) {

                long proxy = 0;

                int protocolVersion =

                    targetVersion < XDnDConstants.XDND_PROTOCOL_VERSION ?

                    targetVersion : XDnDConstants.XDND_PROTOCOL_VERSION;

                WindowPropertyGetter wpg2 =

                    new WindowPropertyGetter(window, XDnDConstants.XA_XdndProxy,

                                             0, 1, false, XAtom.XA_WINDOW);

                try {

                    status = wpg2.execute(XToolkit.IgnoreBadWindowHandler);

                    if (status == XlibWrapper.Success &&

                        wpg2.getData() != 0 &&

                        wpg2.getActualType() == XAtom.XA_WINDOW) {

                        proxy = Native.getLong(wpg2.getData());

                    }

                } finally {

                    wpg2.dispose();

                }

                if (proxy != 0) {

                    WindowPropertyGetter wpg3 =

                        new WindowPropertyGetter(proxy, XDnDConstants.XA_XdndProxy,

                                                 0, 1, false, XAtom.XA_WINDOW);

                    try {

                        status = wpg3.execute(XToolkit.IgnoreBadWindowHandler);

                        if (status != XlibWrapper.Success ||

                            wpg3.getData() == 0 ||

                            wpg3.getActualType() != XAtom.XA_WINDOW ||

                            Native.getLong(wpg3.getData()) != proxy) {

                            proxy = 0;

                        } else {

                            WindowPropertyGetter wpg4 =

                                new WindowPropertyGetter(proxy,

                                                         XDnDConstants.XA_XdndAware,

                                                         0, 1, false,

                                                         XlibWrapper.AnyPropertyType);

                            try {

                                status = wpg4.execute(XToolkit.IgnoreBadWindowHandler);

                                if (status != XlibWrapper.Success ||

                                    wpg4.getData() == 0 ||

                                    wpg4.getActualType() != XAtom.XA_ATOM) {

                                    proxy = 0;

                                }

                            } finally {

                                wpg4.dispose();

                            }

                        }

                    } finally {

                        wpg3.dispose();

                    }

                }

                return new TargetWindowInfo(proxy, protocolVersion);

            }

        } else {

            wpg1.dispose();

        }

        return null;

    }

    public void sendEnterMessage(long[] formats,

                                 int sourceAction, int sourceActions, long time) {

        assert XToolkit.isAWTLockHeldByCurrentThread();

        assert getTargetWindow() != 0;

        assert formats != null;

        XClientMessageEvent msg = new XClientMessageEvent();

        try {

            msg.set_type((int)XlibWrapper.ClientMessage);

            msg.set_window(getTargetWindow());

            msg.set_format(32);

            msg.set_message_type(XDnDConstants.XA_XdndEnter.getAtom());

            msg.set_data(0, XDragSourceProtocol.getDragSourceWindow());

            long data1 =

                getTargetProtocolVersion() << XDnDConstants.XDND_PROTOCOL_SHIFT;

            data1 |= formats.length > 3 ? XDnDConstants.XDND_DATA_TYPES_BIT : 0;

            msg.set_data(1, data1);

            msg.set_data(2, formats.length > 0 ? formats[0] : 0);

            msg.set_data(3, formats.length > 1 ? formats[1] : 0);

            msg.set_data(4, formats.length > 2 ? formats[2] : 0);

            XlibWrapper.XSendEvent(XToolkit.getDisplay(),

                                   getTargetProxyWindow(),

                                   false, XlibWrapper.NoEventMask,

                                   msg.pData);

        } finally {

            msg.dispose();

        }

    }

    public void sendMoveMessage(int xRoot, int yRoot,

                                int sourceAction, int sourceActions, long time) {

        assert XToolkit.isAWTLockHeldByCurrentThread();

        assert getTargetWindow() != 0;

        XClientMessageEvent msg = new XClientMessageEvent();

        try {

            msg.set_type((int)XlibWrapper.ClientMessage);

            msg.set_window(getTargetWindow());

            msg.set_format(32);

            msg.set_message_type(XDnDConstants.XA_XdndPosition.getAtom());

            msg.set_data(0, XDragSourceProtocol.getDragSourceWindow());

            msg.set_data(1, 0); /* flags */

            msg.set_data(2, xRoot << 16 | yRoot);

            msg.set_data(3, time);

            msg.set_data(4, XDnDConstants.getXDnDActionForJavaAction(sourceAction));

            XlibWrapper.XSendEvent(XToolkit.getDisplay(),

                                   getTargetProxyWindow(),

                                   false, XlibWrapper.NoEventMask,

                                   msg.pData);

        } finally {

            msg.dispose();

        }

    }

    public void sendLeaveMessage(long time) {

        assert XToolkit.isAWTLockHeldByCurrentThread();

        assert getTargetWindow() != 0;

        XClientMessageEvent msg = new XClientMessageEvent();

        try {

            msg.set_type((int)XlibWrapper.ClientMessage);

            msg.set_window(getTargetWindow());

            msg.set_format(32);

            msg.set_message_type(XDnDConstants.XA_XdndLeave.getAtom());

            msg.set_data(0, XDragSourceProtocol.getDragSourceWindow());

            msg.set_data(1, 0);

            msg.set_data(2, 0);

            msg.set_data(3, 0);

            msg.set_data(4, 0);

            XlibWrapper.XSendEvent(XToolkit.getDisplay(),

                                   getTargetProxyWindow(),

                                   false, XlibWrapper.NoEventMask,

                                   msg.pData);

        } finally {

            msg.dispose();

        }

    }

    public void sendDropMessage(int xRoot, int yRoot,

                                int sourceAction, int sourceActions,

                                long time) {

        assert XToolkit.isAWTLockHeldByCurrentThread();

        assert getTargetWindow() != 0;

        XClientMessageEvent msg = new XClientMessageEvent();

        try {

            msg.set_type((int)XlibWrapper.ClientMessage);

            msg.set_window(getTargetWindow());

            msg.set_format(32);

            msg.set_message_type(XDnDConstants.XA_XdndDrop.getAtom());

            msg.set_data(0, XDragSourceProtocol.getDragSourceWindow());

            msg.set_data(1, 0); /* flags */

            msg.set_data(2, time);

            msg.set_data(3, 0);

            msg.set_data(4, 0);

            XlibWrapper.XSendEvent(XToolkit.getDisplay(),

                                   getTargetProxyWindow(),

                                   false, XlibWrapper.NoEventMask,

                                   msg.pData);

        } finally {

            msg.dispose();

        }

    }

    public boolean processProxyModeEvent(XClientMessageEvent xclient,

                                         long sourceWindow) {

        if (xclient.get_message_type() == XDnDConstants.XA_XdndStatus.getAtom() ||

            xclient.get_message_type() == XDnDConstants.XA_XdndFinished.getAtom()) {

            if (xclient.get_message_type() == XDnDConstants.XA_XdndFinished.getAtom()) {

                XDragSourceContextPeer.setProxyModeSourceWindow(0);

            }

            // This can happen if the drag operation started in the XEmbed server.

            // In this case there is no need to forward it elsewhere, we should

            // process it here.

            if (xclient.get_window() == sourceWindow) {

                return false;

            }

            if (logger.isLoggable(Level.FINEST)) {

                logger.finest("        sourceWindow=" + sourceWindow +

                              " get_window=" + xclient.get_window() +

                              " xclient=" + xclient);

            }

            xclient.set_data(0, xclient.get_window());

            xclient.set_window(sourceWindow);

            assert XToolkit.isAWTLockHeldByCurrentThread();

            XlibWrapper.XSendEvent(XToolkit.getDisplay(), sourceWindow,

                                   false, XlibWrapper.NoEventMask,

                                   xclient.pData);

            return true;

        }

        return false;

    }

    // TODO: register this runnable with XDnDSelection.

    public void run() {

        // XdndSelection ownership lost.

        cleanup();

    }

}