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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) [2020] Payara Foundation and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://github.com/payara/Payara/blob/master/LICENSE.txt
 * See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * The Payara Foundation designates this particular file as subject to the "Classpath"
 * exception as provided by the Payara Foundation in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */
package org.glassfish.config.support;

import static java.lang.String.format;
import static java.util.logging.Level.WARNING;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.HashMap;
import java.util.Map;
import java.util.logging.Logger;

import org.jvnet.hk2.config.ConfigBeanProxy;

public class GlassFishStubBean implements InvocationHandler {

    private static final Logger LOGGER = Logger.getLogger(GlassFishStubBean.class.getName());

    private final Map getterResults;

    private GlassFishStubBean(ConfigBeanProxy bean) {
        this.getterResults = new HashMap<>();
        for (Method m : bean.getClass().getMethods()) {
            final String methodName = m.getName();
            if (methodName.startsWith("get") && !methodName.equals("getParent") && m.getParameterTypes().length == 0) {
                try {
                    getterResults.put(methodName, m.invoke(bean));
                } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException ex) {
                    LOGGER.log(WARNING, format("Failed to call getter method \"%s\" for config bean \"%s\".",
                            methodName, bean.getClass().getSimpleName()), ex);
                }
            }
        }
    }

    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        return getterResults.get(method.getName());
    }

    public static  T cloneBean(T configBean, Class interfaceClass) {
        return (T) Proxy.newProxyInstance(interfaceClass.getClassLoader(), new Class[]{interfaceClass}, new GlassFishStubBean(configBean));
    }

}