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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2010-2012 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
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 * 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://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
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 */

package org.glassfish.config.support;


import com.sun.enterprise.config.serverbeans.Config;
import com.sun.enterprise.config.serverbeans.Server;
import com.sun.enterprise.config.serverbeans.Cluster;
import org.glassfish.api.Param;
import org.glassfish.api.admin.AdminCommandContext;
import org.glassfish.hk2.api.ServiceLocator;
import org.jvnet.hk2.annotations.Service;
import org.jvnet.hk2.config.ConfigBeanProxy;
import org.jvnet.hk2.config.ConfigModel;
import org.jvnet.hk2.config.Dom;

import javax.inject.Inject;
import java.util.Collection;


/**
 * Resolver based on a supplied target parameter (with a possible default
 * value).
 *
 * @author Jerome Dochez
 */
@Service
public class TargetBasedResolver implements CrudResolver {

    @Param(defaultValue = "server", optional=true)
    String target="server";

    @Inject
    ServiceLocator habitat;
    
    @Override
    public  T resolve(AdminCommandContext context, Class type) {
        try {
            ConfigBeanProxy proxy = getTarget(Config.class, type);
            if (proxy==null) {
                proxy=getTarget(Cluster.class, type);
            }
            if (proxy==null) {
                proxy=getTarget(Server.class, type);
            }
            return type.cast(proxy);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
        }
        return null;
    }

    private  T getTarget(Class targetType, Class type) throws ClassNotFoundException {

        // when using the target based parameter, we look first for a configuration of that name,
        // then we look for a cluster of that name and finally we look for a subelement of the right type

        final String name = getName();

        ConfigBeanProxy config = habitat.getService(targetType, target);
        if (config!=null) {
            try {
                return type.cast(config);
            } catch (ClassCastException e) {
                // ok we need to do more work to find which object is really requested.
            }
            Dom parentDom = Dom.unwrap(config);

            String elementName = GenericCrudCommand.elementName(parentDom.document, targetType, type);
            if (elementName==null) {
                return null;
            }
            ConfigModel.Property property = parentDom.model.getElement(elementName);
            if (property.isCollection()) {
                Collection collection = parentDom.nodeElements(elementName);
                if (collection==null) {
                    return null;
                }

                for (Dom child : collection) {
                    if (name.equals(child.attribute("ref"))) {
                        return type.cast(child.createProxy());
                    }
                }
            }
        }
        return null;
    }

    public String getName() {
        return "";
    }

}