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/*
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 *
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 *
 * 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://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.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
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 * GPL Classpath Exception:
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 */
package com.sun.enterprise.config.modularity.parser;

import com.sun.enterprise.config.modularity.ConfigModularityUtils;
import com.sun.enterprise.config.modularity.RankedConfigBeanProxy;
import com.sun.enterprise.config.modularity.annotation.HasNoDefaultConfiguration;
import com.sun.enterprise.config.modularity.customization.ConfigBeanDefaultValue;
import com.sun.enterprise.config.util.ConfigApiLoggerInfo;
import com.sun.enterprise.module.bootstrap.StartupContext;

import org.glassfish.api.admin.ServerEnvironment;
import org.glassfish.api.admin.config.ConfigExtension;
import org.glassfish.hk2.api.ServiceLocator;
import org.glassfish.hk2.utilities.BuilderHelper;
import org.glassfish.hk2.utilities.ServiceLocatorUtilities;
import org.jvnet.hk2.annotations.Service;
import org.jvnet.hk2.config.ConfigBeanProxy;
import org.jvnet.hk2.config.ConfigSupport;
import org.jvnet.hk2.config.Dom;
import org.jvnet.hk2.config.SingleConfigCode;
import org.jvnet.hk2.config.TransactionFailure;

import javax.inject.Inject;

import java.beans.PropertyVetoException;
import java.util.List;
import java.util.logging.Logger;

/**
 * Containing shared functionalists between different derived classes like ConfigSnippetLoader and so on.
 * Shared functionalists includes finding, loading the configuration and creating a ConFigBean from it.
 *
 * @author Masoud Kalali
 */
@Service
public class ModuleConfigurationLoader {
    
    @Inject
    private ServiceLocator serviceLocator;

    @Inject
    private ConfigurationParser configurationParser;

    @Inject
    private ConfigModularityUtils configModularityUtils;

    private C extensionOwner;

    public  U createConfigBeanForType(Class configExtensionType, C extensionOwner) throws TransactionFailure {
        this.extensionOwner = extensionOwner;
        if (configModularityUtils.hasCustomConfig(configExtensionType)) {
            addConfigBeanFor(configExtensionType);
        } else {
            if (configExtensionType.getAnnotation(HasNoDefaultConfiguration.class) != null) {
                return null;
            }
            final Class childElement = configExtensionType;
            synchronized (configModularityUtils) {
                boolean oldIP = configModularityUtils.isIgnorePersisting();
                try {
                    configModularityUtils.setIgnorePersisting(true);
                    ConfigSupport.apply(new SingleConfigCode() {
                        @Override
                        public Object run(ConfigBeanProxy parent) throws PropertyVetoException, TransactionFailure {
                            U child = parent.createChild(childElement);
                            Dom unwrappedChild = Dom.unwrap(child);
                            unwrappedChild.addDefaultChildren();
                            configModularityUtils.getExtensions(parent).add(child);
                            return child;
                        }
                    }, extensionOwner);
                } finally {
                    configModularityUtils.setIgnorePersisting(oldIP);
                }
            }
        }

        return getExtension(configExtensionType, extensionOwner);
    }

    private  U getExtension(Class configExtensionType, C extensionOwner) {
        List extensions = configModularityUtils.getExtensions(extensionOwner);
        for (ConfigBeanProxy extension : extensions) {
            try {
                U configBeanInstance = configExtensionType.cast(extension);
                if (configBeanInstance instanceof ConfigExtension) {
                    ServiceLocatorUtilities.addOneDescriptor(serviceLocator,
                            BuilderHelper.createConstantDescriptor(configBeanInstance, ServerEnvironment.DEFAULT_INSTANCE_NAME,
                                    ConfigSupport.getImpl(configBeanInstance).getProxyType()));
                }
                return configBeanInstance;
            } catch (Exception e) {
                // ignore, not the right type.
            }
        }
        return null;
    }


    protected  void addConfigBeanFor(Class extensionType) {
        if (!RankedConfigBeanProxy.class.isAssignableFrom(extensionType)) {
            if (getExtension(extensionType, extensionOwner) != null) {
                return;
            }
        }
        StartupContext context = serviceLocator.getService(StartupContext.class);
        List configBeanDefaultValueList =
                configModularityUtils.getDefaultConfigurations(extensionType, configModularityUtils.getRuntimeTypePrefix(context));
        configurationParser.parseAndSetConfigBean(configBeanDefaultValueList);
    }


}