/*
 * This file is part of OneConfig.
 * OneConfig - Next Generation Config Library for Minecraft: Java Edition
 * Copyright (C) 2021, 2022 Polyfrost.
 *   <https://polyfrost.cc> <https://github.com/Polyfrost/>
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 *   OneConfig is licensed under the terms of version 3 of the GNU Lesser
 * General Public License as published by the Free Software Foundation, AND
 * under the Additional Terms Applicable to OneConfig, as published by Polyfrost,
 * either version 1.0 of the Additional Terms, or (at your option) any later
 * version.
 *
 *   This program 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
 * Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public
 * License.  If not, see <https://www.gnu.org/licenses/>. You should
 * have also received a copy of the Additional Terms Applicable
 * to OneConfig, as published by Polyfrost. If not, see
 * <https://polyfrost.cc/legal/oneconfig/additional-terms>
 */

package cc.polyfrost.oneconfig.internal.plugin.hooks;

import org.lwjgl.system.FunctionProvider;

import java.lang.reflect.Method;
import java.nio.ByteBuffer;

/**
 * Taken from LWJGLTwoPointFive under The Unlicense
 * <a href="https://github.com/DJtheRedstoner/LWJGLTwoPointFive/blob/master/LICENSE/">https://github.com/DJtheRedstoner/LWJGLTwoPointFive/blob/master/LICENSE/</a>
 */
public class Lwjgl2FunctionProvider implements FunctionProvider {

    private static final Class<?> GLContext;
    private final Method m_getFunctionAddress;

    static {
        try {
            GLContext = Class.forName("org.lwjgl.opengl.GLContext");
        } catch (Throwable t) {
            throw new RuntimeException("Unable to initialize LWJGL2FunctionProvider", t);
        }
    }

    public Lwjgl2FunctionProvider() {
        try {
            m_getFunctionAddress = GLContext.getDeclaredMethod("getFunctionAddress", String.class);
            m_getFunctionAddress.setAccessible(true);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public long getFunctionAddress(CharSequence functionName) {
        try {
            return (long) m_getFunctionAddress.invoke(null, functionName.toString());
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public long getFunctionAddress(ByteBuffer byteBuffer) {
        throw new UnsupportedOperationException();
    }
}