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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.geom.PickRay;
import com.sun.javafx.scene.input.PickResultChooser;
import com.sun.javafx.sg.prism.NGTriangleMesh;
import com.sun.javafx.util.Utils;
import javafx.scene.Node;
import javafx.scene.shape.CullFace;
import javafx.scene.shape.Mesh;
import javafx.scene.shape.TriangleMesh;

/**
 * Used to access internal methods of TriangleMesh.
 */
public class TriangleMeshHelper extends MeshHelper {

    private static final TriangleMeshHelper theInstance;
    private static TriangleMeshAccessor triangleMeshAccessor;

    static {
        theInstance = new TriangleMeshHelper();
        Utils.forceInit(TriangleMesh.class);
    }

    private static TriangleMeshHelper getInstance() {
        return theInstance;
    }

    public static void initHelper(TriangleMesh triangleMesh) {
        setHelper(triangleMesh, getInstance());
    }

    @Override
    protected  boolean computeIntersectsImpl(Mesh mesh,
            PickRay pickRay, PickResultChooser pickResult, Node candidate,
            CullFace cullFace, boolean reportFace) {
        return triangleMeshAccessor.doComputeIntersects(mesh, pickRay, pickResult,
                candidate, cullFace, reportFace);
    }

    public static void setTriangleMeshAccessor(final TriangleMeshAccessor newAccessor) {
        if (triangleMeshAccessor != null) {
            throw new IllegalStateException();
        }

        triangleMeshAccessor = newAccessor;
    }

    public interface TriangleMeshAccessor {
        boolean doComputeIntersects(Mesh mesh,
            PickRay pickRay, PickResultChooser pickResult, Node candidate,
            CullFace cullFace, boolean reportFace);
    }

}