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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) [2016-2021] 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/main/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
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package fish.payara.monitoring.rest.app.handler;

import fish.payara.monitoring.rest.app.RestMonitoringAppResponseToken;
import fish.payara.monitoring.rest.app.MBeanServerDelegate;
import fish.payara.monitoring.rest.app.processor.ProcessorFactory;
import fish.payara.monitoring.rest.app.processor.TypeProcessor;
import jakarta.inject.Singleton;
import jakarta.json.Json;
import jakarta.json.JsonException;
import jakarta.json.JsonObject;
import jakarta.json.JsonObjectBuilder;
import jakarta.json.JsonValue;
import javax.management.AttributeNotFoundException;
import javax.management.InstanceNotFoundException;
import javax.management.MBeanException;
import javax.management.MalformedObjectNameException;
import javax.management.ReflectionException;
import jakarta.ws.rs.core.Response;

/**
 *
 * @author Fraser Savage
 */
public class MBeanAttributeReadHandler extends ReadHandler {

    private final String mbeanname;
    private final String attributename;

    /**
     * Creates an instance of MBeanAttributeReadHandler, which handles MBean
     * attribute read requests.
     * 
     * @param delegate The {@link MBeanServerDelegate} to get information from.
     * @param mbeanname The {@link ObjectName} of the MBean to get information from.
     * @param attributename The name of the MBean attribute to get values for.
     */
    public MBeanAttributeReadHandler(@Singleton MBeanServerDelegate delegate, 
            String mbeanname, String attributename) {
        super(delegate);
        this.mbeanname = mbeanname;
        this.attributename = attributename;
    }

    @Override
    public JsonObject getRequestObject() {
        JsonObjectBuilder objectBuilder = Json.createObjectBuilder();
        try {
            objectBuilder.add(RestMonitoringAppResponseToken.getMbeanNameKey(), 
                    mbeanname);
            objectBuilder.add(RestMonitoringAppResponseToken.getAttributeNameKey(), 
                    attributename);
            objectBuilder.add(RestMonitoringAppResponseToken.getRequestTypeKey(), 
                    requesttype);
        } catch (JsonException ex) {
            super.setStatus(Response.Status.INTERNAL_SERVER_ERROR);
        }
        return objectBuilder.build();
    }

    @Override
    public JsonValue getValueObject() throws JsonException {
        try {
            Object attribute = delegate
                    .getMBeanAttribute(mbeanname, attributename);
            if (attribute == null) {
                return JsonValue.NULL;
            }
            TypeProcessor processor = ProcessorFactory.getTypeProcessor(attribute);
            
            return processor.processObject(attribute);
        } catch (InstanceNotFoundException | ReflectionException | MalformedObjectNameException | MBeanException | AttributeNotFoundException ex) {
            super.setStatus(Response.Status.NOT_FOUND);
            return getTraceObject(ex);
        }
    }
}