/*

 * Copyright (c) 2011, Oracle and/or its affiliates. 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.  Oracle designates this

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

 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

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 */

package com.apple.eawt;

import java.awt.Frame;

import java.awt.peer.MenuComponentPeer;

import javax.swing.*;

import javax.swing.plaf.MenuBarUI;

import sun.lwawt.macosx.CMenuBar;

import com.apple.laf.AquaMenuBarUI;

class _AppMenuBarHandler {

    private static final int MENU_ABOUT = 1;

    private static final int MENU_PREFS = 2;

    private static native void nativeSetMenuState(final int menu, final boolean visible, final boolean enabled);

    private static native void nativeSetDefaultMenuBar(final long menuBarPeer);

    static final _AppMenuBarHandler instance = new _AppMenuBarHandler();

    static _AppMenuBarHandler getInstance() {

        return instance;

    }

    // callback from the native delegate -init function

    private static void initMenuStates(final boolean aboutMenuItemVisible, final boolean aboutMenuItemEnabled, final boolean prefsMenuItemVisible, final boolean prefsMenuItemEnabled) {

        synchronized (instance) {

            instance.aboutMenuItemVisible = aboutMenuItemVisible;

            instance.aboutMenuItemEnabled = aboutMenuItemEnabled;

            instance.prefsMenuItemVisible = prefsMenuItemVisible;

            instance.prefsMenuItemEnabled = prefsMenuItemEnabled;

        }

    }

    _AppMenuBarHandler() { }

    boolean aboutMenuItemVisible;

    boolean aboutMenuItemEnabled;

    boolean prefsMenuItemVisible;

    boolean prefsMenuItemEnabled;

    boolean prefsMenuItemExplicitlySet;

    void setDefaultMenuBar(final JMenuBar menuBar) {

        installDefaultMenuBar(menuBar);

        // scan the current frames, and see if any are foreground

        final Frame[] frames = Frame.getFrames();

        for (final Frame frame : frames) {

        }

        // if we have no foreground frames, then we have to "kick" the menubar

        final JFrame pingFrame = new JFrame();

        pingFrame.getRootPane().putClientProperty("Window.alpha", new Float(0.0f));

        pingFrame.setVisible(true);

        pingFrame.toFront();

        pingFrame.setVisible(false);

        pingFrame.dispose();

    }

    static boolean isFrameMinimized(final Frame frame) {

        return (frame.getExtendedState() & Frame.ICONIFIED) != 0;

    }

    @SuppressWarnings("deprecation")

    static void installDefaultMenuBar(final JMenuBar menuBar) {

        if (menuBar == null) {

            // intentionally clearing the default menu

            nativeSetDefaultMenuBar(0);

            return;

        }

        final MenuBarUI ui = menuBar.getUI();

        if (!(ui instanceof AquaMenuBarUI)) {

            // Aqua was not installed

            throw new IllegalStateException("Application.setDefaultMenuBar() only works with the Aqua Look and Feel");

        }

        final AquaMenuBarUI aquaUI = (AquaMenuBarUI)ui;

        final ScreenMenuBar screenMenuBar = aquaUI.getScreenMenuBar();

        if (screenMenuBar == null) {

            // Aqua is installed, but we aren't using the screen menu bar

            throw new IllegalStateException("Application.setDefaultMenuBar() only works if apple.laf.useScreenMenuBar=true");

        }

        screenMenuBar.addNotify();

        final MenuComponentPeer peer = screenMenuBar.getPeer();

        if (!(peer instanceof CMenuBar)) {

            // such a thing should not be possible

            throw new IllegalStateException("Unable to determine native menu bar from provided JMenuBar");

        }

        // grab the pointer to the CMenuBar, and retain it in native

    }

    void setAboutMenuItemVisible(final boolean present) {

        synchronized (this) {

            if (aboutMenuItemVisible == present) return;

            aboutMenuItemVisible = present;

        }

        nativeSetMenuState(MENU_ABOUT, aboutMenuItemVisible, aboutMenuItemEnabled);

    }

    void setPreferencesMenuItemVisible(final boolean present) {

        synchronized (this) {

            prefsMenuItemExplicitlySet = true;

            if (prefsMenuItemVisible == present) return;

            prefsMenuItemVisible = present;

        }

        nativeSetMenuState(MENU_PREFS, prefsMenuItemVisible, prefsMenuItemEnabled);

    }

    void setAboutMenuItemEnabled(final boolean enable) {

        synchronized (this) {

            if (aboutMenuItemEnabled == enable) return;

            aboutMenuItemEnabled = enable;

        }

        nativeSetMenuState(MENU_ABOUT, aboutMenuItemVisible, aboutMenuItemEnabled);

    }

    void setPreferencesMenuItemEnabled(final boolean enable) {

        synchronized (this) {

            prefsMenuItemExplicitlySet = true;

            if (prefsMenuItemEnabled == enable) return;

            prefsMenuItemEnabled = enable;

        }

        nativeSetMenuState(MENU_PREFS, prefsMenuItemVisible, prefsMenuItemEnabled);

    }

    boolean isAboutMenuItemVisible() {

        return aboutMenuItemVisible;

    }

    boolean isPreferencesMenuItemVisible() {

        return prefsMenuItemVisible;

    }

    boolean isAboutMenuItemEnabled() {

        return aboutMenuItemEnabled;

    }

    boolean isPreferencesMenuItemEnabled() {

        return prefsMenuItemEnabled;

    }

}