/*
 * Copyright (c) 2010, 2016, 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
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package com.sun.glass.ui.gtk;

import com.sun.glass.ui.Application;
import com.sun.glass.ui.Menu;
import com.sun.glass.ui.MenuBar;
import com.sun.glass.ui.MenuItem;
import com.sun.glass.ui.PlatformFactory;
import com.sun.glass.ui.Window;
import com.sun.glass.ui.delegate.ClipboardDelegate;
import com.sun.glass.ui.delegate.MenuBarDelegate;
import com.sun.glass.ui.delegate.MenuDelegate;
import com.sun.glass.ui.delegate.MenuItemDelegate;
import com.sun.javafx.util.Logging;
import sun.util.logging.PlatformLogger;

import java.lang.reflect.Method;
import java.security.AccessController;
import java.security.PrivilegedAction;

public final class GtkPlatformFactory extends PlatformFactory {
    private static final String SWT_INTERNAL_CLASS =
                                              "org.eclipse.swt.internal.gtk.OS";
    private static final int forcedGtkVersion;


    static  {
        //check for SWT-GTK lib presence
        Class<?> OS = AccessController.
                doPrivileged((PrivilegedAction<Class<?>>) () -> {
                    try {
                        return Class.forName(SWT_INTERNAL_CLASS, true,
                                ClassLoader.getSystemClassLoader());
                    } catch (Exception e) {}
                    try {
                        return Class.forName(SWT_INTERNAL_CLASS, true,
                                Thread.currentThread().getContextClassLoader());
                    } catch (Exception e) {}
                    return null;
                });
        if (OS != null) {
            PlatformLogger logger = Logging.getFocusLogger();
            logger.fine("SWT-GTK library found. Try to obtain GTK version.");
            Method method = AccessController.
                    doPrivileged((PrivilegedAction<Method>) () -> {
                        try {
                            return OS.getMethod("gtk_major_version");
                        } catch (Exception e) {
                            return null;
                        }
                    });
            int ver = 0;
            if (method != null) {
                try {
                    ver = ((Number)method.invoke(OS)).intValue();
                } catch (Exception e) {
                    logger.warning("Method gtk_major_version() of " +
                         "the org.eclipse.swt.internal.gtk.OS class " +
                         "returns error. SWT GTK version cannot be detected. " +
                         "GTK3 will be used as default.");
                    ver = 3;
                }
            }
            if (ver < 2 && ver > 3) {
                logger.warning("SWT-GTK uses unsupported major GTK version "
                        + ver + ". GTK3 will be used as default.");
                ver = 3;
            }
            forcedGtkVersion = ver;
        } else {
            forcedGtkVersion = 0;
        }
    }

    @Override public Application createApplication(){
        return new GtkApplication(forcedGtkVersion);
    }

    @Override public MenuBarDelegate createMenuBarDelegate(MenuBar menubar) {
        return new GtkMenuBarDelegate();
    }

    @Override public MenuDelegate createMenuDelegate(Menu menu) {
        return new GtkMenuDelegate();
    }

    @Override public MenuItemDelegate createMenuItemDelegate(MenuItem item) {
        return new GtkMenuItemDelegate();
    }

    public ClipboardDelegate createClipboardDelegate() {
        return new GtkClipboardDelegate();
    }
}