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/*
 * Copyright (c) 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.javafx.scene.shape;

import com.sun.javafx.sg.prism.NGNode;
import com.sun.javafx.util.Utils;
import javafx.geometry.Bounds;
import javafx.scene.Node;
import javafx.scene.paint.Paint;
import javafx.scene.shape.Path;
import javafx.scene.shape.Shape;

/**
 * Used to access internal methods of Path.
 */
public class PathHelper extends ShapeHelper {

    private static final PathHelper theInstance;
    private static PathAccessor pathAccessor;

    static {
        theInstance = new PathHelper();
        Utils.forceInit(Path.class);
    }

    private static PathHelper getInstance() {
        return theInstance;
    }

    public static void initHelper(Path path) {
        setHelper(path, getInstance());
    }

    @Override
    protected NGNode createPeerImpl(Node node) {
        return pathAccessor.doCreatePeer(node);
    }

    @Override
    protected void updatePeerImpl(Node node) {
        super.updatePeerImpl(node);
        pathAccessor.doUpdatePeer(node);
    }

    @Override
    protected Bounds computeLayoutBoundsImpl(Node node) {
        Bounds bounds = pathAccessor.doComputeLayoutBounds(node);
        if (bounds != null) {
            return bounds;
        }
        return super.computeLayoutBoundsImpl(node);
    }

    @Override
    protected Paint cssGetFillInitialValueImpl(Shape shape) {
        return pathAccessor.doCssGetFillInitialValue(shape);
    }

    @Override
    protected Paint cssGetStrokeInitialValueImpl(Shape shape) {
        return pathAccessor.doCssGetStrokeInitialValue(shape);
    }

    @Override
    protected  com.sun.javafx.geom.Shape configShapeImpl(Shape shape) {
        return pathAccessor.doConfigShape(shape);
    }

    public static void setPathAccessor(final PathAccessor newAccessor) {
        if (pathAccessor != null) {
            throw new IllegalStateException();
        }

        pathAccessor = newAccessor;
    }

    public interface PathAccessor {
        NGNode doCreatePeer(Node node);
        void doUpdatePeer(Node node);
        Bounds doComputeLayoutBounds(Node node);
        Paint doCssGetFillInitialValue(Shape shape);
        Paint doCssGetStrokeInitialValue(Shape shape);
        com.sun.javafx.geom.Shape doConfigShape(Shape shape);
    }

}