/*

 * Copyright 2003-2009 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.Frame;

final class XNETProtocol extends XProtocol implements XStateProtocol, XLayerProtocol

{

    /**

     * XStateProtocol

     */

    public boolean supportsState(int state) {

        return doStateProtocol() ; // TODO - check for Frame constants

    }

    public void setState(XWindowPeer window, int state) {

        if (window.isShowing()) {

            requestState(window, state);

        } else {

            setInitialState(window, state);

        }

    }

    private void setInitialState(XWindowPeer window, int state) {

        XAtomList old_state = window.getNETWMState();

        if ((state & Frame.MAXIMIZED_VERT) != 0) {

            old_state.add(XA_NET_WM_STATE_MAXIMIZED_VERT);

        } else {

            old_state.remove(XA_NET_WM_STATE_MAXIMIZED_VERT);

        }

        if ((state & Frame.MAXIMIZED_HORIZ) != 0) {

            old_state.add(XA_NET_WM_STATE_MAXIMIZED_HORZ);

        } else {

            old_state.remove(XA_NET_WM_STATE_MAXIMIZED_HORZ);

        }

        window.setNETWMState(old_state);

    }

    private void requestState(XWindowPeer window, int state) {

        /*

         * We have to use toggle for maximization because of transitions

         * from maximization in one direction only to maximization in the

         * other direction only.

         */

        int old_net_state = getState(window);

        int max_changed = (state ^ old_net_state) & (Frame.MAXIMIZED_BOTH);

        XClientMessageEvent req = new XClientMessageEvent();

        try {

            switch(max_changed) {

              case 0:

                  return;

              case Frame.MAXIMIZED_HORIZ:

                  req.set_data(1, XA_NET_WM_STATE_MAXIMIZED_HORZ.getAtom());

                  req.set_data(2, 0);

                  break;

              case Frame.MAXIMIZED_VERT:

                  req.set_data(1, XA_NET_WM_STATE_MAXIMIZED_VERT.getAtom());

                  req.set_data(2, 0);

                  break;

              case Frame.MAXIMIZED_BOTH:

                  req.set_data(1, XA_NET_WM_STATE_MAXIMIZED_HORZ.getAtom());

                  req.set_data(2, XA_NET_WM_STATE_MAXIMIZED_VERT.getAtom());

                  break;

              default:

                  return;

            }

            req.set_type((int)XConstants.ClientMessage);

            req.set_window(window.getWindow());

            req.set_message_type(XA_NET_WM_STATE.getAtom());

            req.set_format(32);

            req.set_data(0, _NET_WM_STATE_TOGGLE);

            XToolkit.awtLock();

            try {

                XlibWrapper.XSendEvent(XToolkit.getDisplay(),

                        XlibWrapper.RootWindow(XToolkit.getDisplay(), window.getScreenNumber()),

                        false,

                        XConstants.SubstructureRedirectMask | XConstants.SubstructureNotifyMask,

                        req.pData);

            }

            finally {

                XToolkit.awtUnlock();

            }

        } finally {

            req.dispose();

        }

    }

    public int getState(XWindowPeer window) {

        return getStateImpl(window);

    }

    /*

     * New "NET" WM spec: _NET_WM_STATE/Atom[]

     */

    int getStateImpl(XWindowPeer window) {

        XAtomList net_wm_state = window.getNETWMState();

        if (net_wm_state.size() == 0) {

            return Frame.NORMAL;

        }

        int java_state = Frame.NORMAL;

        if (net_wm_state.contains(XA_NET_WM_STATE_MAXIMIZED_VERT)) {

            java_state |= Frame.MAXIMIZED_VERT;

        }

        if (net_wm_state.contains(XA_NET_WM_STATE_MAXIMIZED_HORZ)) {

            java_state |= Frame.MAXIMIZED_HORIZ;

        }

        return java_state;

    }

    public boolean isStateChange(XPropertyEvent e) {

        boolean res = doStateProtocol() && (e.get_atom() == XA_NET_WM_STATE.getAtom()) ;

        if (res) {

            // Since state change happened, reset our cached state.  It will be re-read by getState

            XWindowPeer wpeer = (XWindowPeer)XToolkit.windowToXWindow(e.get_window());

            wpeer.setNETWMState(null);

        }

        return res;

    }

    /*

     * Work around for 4775545.

     */

    public void unshadeKludge(XWindowPeer window) {

        XAtomList net_wm_state = window.getNETWMState();

        net_wm_state.remove(XA_NET_WM_STATE_SHADED);

        window.setNETWMState(net_wm_state);

    }

    /**

     * XLayerProtocol

     */

    public boolean supportsLayer(int layer) {

        return ((layer == LAYER_ALWAYS_ON_TOP) || (layer == LAYER_NORMAL)) && doLayerProtocol();

    }

    public void requestState(XWindow window, XAtom state, boolean isAdd) {

        XClientMessageEvent req = new XClientMessageEvent();

        try {

            req.set_type((int)XConstants.ClientMessage);

            req.set_window(window.getWindow());

            req.set_message_type(XA_NET_WM_STATE.getAtom());

            req.set_format(32);

            req.set_data(0, isAdd ? _NET_WM_STATE_ADD : _NET_WM_STATE_REMOVE);

            req.set_data(1, state.getAtom());

            // Fix for 6735584: req.data[2] must be set to 0 when only one property is changed

            req.set_data(2, 0);

            XToolkit.awtLock();

            try {

                XlibWrapper.XSendEvent(XToolkit.getDisplay(),

                        XlibWrapper.RootWindow(XToolkit.getDisplay(), window.getScreenNumber()),

                        false,

                        XConstants.SubstructureRedirectMask | XConstants.SubstructureNotifyMask,

                        req.pData);

            }

            finally {

                XToolkit.awtUnlock();

            }

        } finally {

            req.dispose();

        }

    }

    /**

     * Helper function to set/reset one state in NET_WM_STATE

     * If window is showing then it uses ClientMessage, otherwise adjusts NET_WM_STATE list

     * @param window Window which NET_WM_STATE property is being modified

     * @param state State atom to be set/reset

     * @param reset Indicates operation, 'set' if false, 'reset' if true

     */

    private void setStateHelper(XWindowPeer window, XAtom state, boolean set) {

        if (window.isShowing()) {

            requestState(window, state, set);

        } else {

            XAtomList net_wm_state = window.getNETWMState();

            if (!set) {

                net_wm_state.remove(state);

            } else {

                net_wm_state.add(state);

            }

            window.setNETWMState(net_wm_state);

        }

        XToolkit.XSync();

    }

    public void setLayer(XWindowPeer window, int layer) {

        setStateHelper(window, XA_NET_WM_STATE_ABOVE, layer == LAYER_ALWAYS_ON_TOP);

    }

    /* New "netwm" spec from www.freedesktop.org */

    XAtom XA_UTF8_STRING = XAtom.get("UTF8_STRING");   /* like STRING but encoding is UTF-8 */

    XAtom XA_NET_SUPPORTING_WM_CHECK = XAtom.get("_NET_SUPPORTING_WM_CHECK");

    XAtom XA_NET_SUPPORTED = XAtom.get("_NET_SUPPORTED");      /* list of protocols (property of root) */

    XAtom XA_NET_WM_NAME = XAtom.get("_NET_WM_NAME");  /* window property */

    XAtom XA_NET_WM_STATE = XAtom.get("_NET_WM_STATE");/* both window property and request */

/*

 * _NET_WM_STATE is a list of atoms.

 * NB: Standard spelling is "HORZ" (yes, without an 'I'), but KDE2

 * uses misspelled "HORIZ" (see KDE bug #20229).  This was fixed in

 * KDE 2.2.  Under earlier versions of KDE2 horizontal and full

 * maximization doesn't work .

 */

    XAtom XA_NET_WM_STATE_MAXIMIZED_HORZ = XAtom.get("_NET_WM_STATE_MAXIMIZED_HORZ");

    XAtom XA_NET_WM_STATE_MAXIMIZED_VERT = XAtom.get("_NET_WM_STATE_MAXIMIZED_VERT");

    XAtom XA_NET_WM_STATE_SHADED = XAtom.get("_NET_WM_STATE_SHADED");

    XAtom XA_NET_WM_STATE_ABOVE = XAtom.get("_NET_WM_STATE_ABOVE");

    XAtom XA_NET_WM_STATE_MODAL = XAtom.get("_NET_WM_STATE_MODAL");

    XAtom XA_NET_WM_STATE_FULLSCREEN = XAtom.get("_NET_WM_STATE_FULLSCREEN");

    XAtom XA_NET_WM_STATE_BELOW = XAtom.get("_NET_WM_STATE_BELOW");

    XAtom XA_NET_WM_STATE_HIDDEN = XAtom.get("_NET_WM_STATE_HIDDEN");

    XAtom XA_NET_WM_STATE_SKIP_TASKBAR = XAtom.get("_NET_WM_STATE_SKIP_TASKBAR");

    XAtom XA_NET_WM_STATE_SKIP_PAGER = XAtom.get("_NET_WM_STATE_SKIP_PAGER");

    XAtom XA_NET_WM_WINDOW_TYPE = XAtom.get("_NET_WM_WINDOW_TYPE");

    XAtom XA_NET_WM_WINDOW_TYPE_DIALOG = XAtom.get("_NET_WM_WINDOW_TYPE_DIALOG");

    XAtom XA_NET_WM_WINDOW_OPACITY = XAtom.get("_NET_WM_WINDOW_OPACITY");

/* For _NET_WM_STATE ClientMessage requests */

    final static int _NET_WM_STATE_REMOVE      =0; /* remove/unset property */

    final static int _NET_WM_STATE_ADD         =1; /* add/set property      */

    final static int _NET_WM_STATE_TOGGLE      =2; /* toggle property       */

    boolean supportChecked = false;

    long NetWindow = 0;

    void detect() {

        if (supportChecked) {

            // TODO: How about detecting WM-restart or exit?

            return;

        }

        NetWindow = checkAnchor(XA_NET_SUPPORTING_WM_CHECK, XAtom.XA_WINDOW);

        supportChecked = true;

    }

    boolean active() {

        detect();

        return NetWindow != 0;

    }

    boolean doStateProtocol() {

        boolean res = active() && checkProtocol(XA_NET_SUPPORTED, XA_NET_WM_STATE);

        stateLog.finer("doStateProtocol() returns " + res);

        return res;

    }

    boolean doLayerProtocol() {

        boolean res = active() && checkProtocol(XA_NET_SUPPORTED, XA_NET_WM_STATE_ABOVE);

        return res;

    }

    boolean doModalityProtocol() {

        boolean res = active() && checkProtocol(XA_NET_SUPPORTED, XA_NET_WM_STATE_MODAL);

        return res;

    }

    boolean doOpacityProtocol() {

        boolean res = active() && checkProtocol(XA_NET_SUPPORTED, XA_NET_WM_WINDOW_OPACITY);

        return res;

    }

    boolean isWMName(String name) {

        if (!active()) {

            return false;

        }

        String net_wm_name_string = getWMName();

        if (net_wm_name_string == null) {

            return false;

        }

        return net_wm_name_string.startsWith(name);

    }

    String net_wm_name_cache;

    public String getWMName() {

        if (!active()) {

            return null;

        }

        if (net_wm_name_cache != null) {

            return net_wm_name_cache;

        }

        /*

         * Check both UTF8_STRING and STRING.  We only call this function

         * with ASCII names and UTF8 preserves ASCII bit-wise.  wm-spec

         * mandates UTF8_STRING for _NET_WM_NAME but at least sawfish-1.0

         * still uses STRING.  (mmm, moving targets...).

         */

        String charSet = "UTF8";

        byte[] net_wm_name = XA_NET_WM_NAME.getByteArrayProperty(NetWindow, XA_UTF8_STRING.getAtom());

        if (net_wm_name == null) {

            net_wm_name = XA_NET_WM_NAME.getByteArrayProperty(NetWindow, XAtom.XA_STRING);

            charSet = "ASCII";

        }

        if (net_wm_name == null) {

            return null;

        }

        try {

            net_wm_name_cache = new String(net_wm_name, charSet);

            return net_wm_name_cache;

        } catch (java.io.UnsupportedEncodingException uex) {

            return null;

        }

    }

    /**

     * Sets _NET_WM_ICON property on the window using the List of XIconInfo

     * If icons is null or empty list, removes _NET_WM_ICON property

     */

    public void setWMIcons(XWindowPeer window, java.util.List<XIconInfo> icons) {

        if (window == null) return;

        XAtom iconsAtom = XAtom.get("_NET_WM_ICON");

        if (icons == null) {

            iconsAtom.DeleteProperty(window);

            return;

        }

        int length = 0;

        for (XIconInfo ii : icons) {

            length += ii.getRawLength();

        }

        int cardinalSize = (XlibWrapper.dataModel == 32) ? 4 : 8;

        int bufferSize = length * cardinalSize;

        if (bufferSize != 0) {

            long buffer = XlibWrapper.unsafe.allocateMemory(bufferSize);

            try {

                long ptr = buffer;

                for (XIconInfo ii : icons) {

                    int size = ii.getRawLength() * cardinalSize;

                    if (XlibWrapper.dataModel == 32) {

                        XlibWrapper.copyIntArray(ptr, ii.getIntData(), size);

                    } else {

                        XlibWrapper.copyLongArray(ptr, ii.getLongData(), size);

                    }

                    ptr += size;

                }

                iconsAtom.setAtomData(window.getWindow(), XAtom.XA_CARDINAL, buffer, bufferSize/Native.getCard32Size());

            } finally {

                XlibWrapper.unsafe.freeMemory(buffer);

            }

        } else {

            iconsAtom.DeleteProperty(window);

        }

    }

    public boolean isWMStateNetHidden(XWindowPeer window) {

        if (!doStateProtocol()) {

            return false;

        }

        XAtomList state = window.getNETWMState();

        return (state != null && state.size() != 0 && state.contains(XA_NET_WM_STATE_HIDDEN));

    }

}