/*
 * Copyright (c) 2013, 2015, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */

package com.sun.javafx.stage;

import javafx.beans.property.ReadOnlyObjectProperty;
import javafx.stage.Screen;
import javafx.stage.Window;

import java.security.AccessControlContext;

/**
 * Used to access internal window methods.
 */
public final class WindowHelper {
    private static WindowAccessor windowAccessor;

    static {
        forceInit(Window.class);
    }

    private WindowHelper() {
    }

    public static void notifyLocationChanged(final Window window,
                                             final double x,
                                             final double y) {
        windowAccessor.notifyLocationChanged(window, x, y);
    }

    public static void notifySizeChanged(final Window window,
                                         final double width,
                                         final double height) {
        windowAccessor.notifySizeChanged(window, width, height);
    }

    public static void notifyScaleChanged(final Window window,
                                          final double newOutputScaleX,
                                          final double newOutputScaleY) {
        windowAccessor.notifyScaleChanged(window, newOutputScaleX, newOutputScaleY);
    }

    static AccessControlContext getAccessControlContext(Window window) {
        return windowAccessor.getAccessControlContext(window);
    }

    public static void setWindowAccessor(final WindowAccessor newAccessor) {
        if (windowAccessor != null) {
            throw new IllegalStateException();
        }

        windowAccessor = newAccessor;
    }

    public static WindowAccessor getWindowAccessor() {
        return windowAccessor;
    }

    public interface WindowAccessor {
        void notifyLocationChanged(Window window, double x, double y);

        void notifySizeChanged(Window window, double width, double height);

        void notifyScreenChanged(Window window, Object from, Object to);

        float getRenderScale(Window window);
        float getPlatformScaleX(Window window);
        float getPlatformScaleY(Window window);

        void notifyScaleChanged(Window window, double newOutputScaleX, double newOutputScaleY);

        ReadOnlyObjectProperty<Screen> screenProperty(Window window);

        AccessControlContext getAccessControlContext(Window window);
    }

    private static void forceInit(final Class<?> classToInit) {
        try {
            Class.forName(classToInit.getName(), true,
                          classToInit.getClassLoader());
        } catch (final ClassNotFoundException e) {
            throw new AssertionError(e);  // Can't happen
        }
    }
}
