/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2014 Oracle 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://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.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle 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:
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 * 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.cdi.transaction;

import org.glassfish.logging.annotation.LogMessagesResourceBundle;
import org.glassfish.logging.annotation.LoggerInfo;

import javax.enterprise.context.Dependent;
import javax.enterprise.context.spi.CreationalContext;
import javax.enterprise.inject.Any;
import javax.enterprise.inject.Default;
import javax.enterprise.inject.spi.*;
import javax.enterprise.util.AnnotationLiteral;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * This class contains utility methods used for TransactionScoped related CDI event processing.
 * @author <a href="mailto:arjav.desai@oracle.com">Arjav Desai</a>
 */
public class TransactionScopedCDIUtil {

    public static final String INITIALIZED_EVENT = "INITIALIZED_EVENT";
    public static final String DESTORYED_EVENT = "DESTORYED_EVENT";

    @LogMessagesResourceBundle
    public static final String SHARED_LOGMESSAGE_RESOURCE = "org.glassfish.cdi.LogMessages";

    @LoggerInfo(subsystem = "AS-CDI-JTA", description = "CDI-JTA", publish = true)
    public static final String CDI_JTA_LOGGER_SUBSYSTEM_NAME = "javax.enterprise.resource.jta";
    private static final Logger _logger = Logger.getLogger(CDI_JTA_LOGGER_SUBSYSTEM_NAME,
            SHARED_LOGMESSAGE_RESOURCE);

    public static void log(String message){
        _logger.log(Level.WARNING,message);
    }

    /* Copied from JSF */
    public static Bean createHelperBean(BeanManager beanManager, Class beanClass) {
        BeanWrapper result = null;
        AnnotatedType annotatedType = beanManager.createAnnotatedType(beanClass);
        result = new BeanWrapper(beanClass);

        //use this to create the class and inject dependencies
        InjectionTargetFactory factory = beanManager.getInjectionTargetFactory(annotatedType);
        final InjectionTarget injectionTarget = factory.createInjectionTarget(result);
        result.setInjectionTarget(injectionTarget);

        return result;
    }

    public static void fireEvent(String eventType) {
        BeanManager beanManager = null;
        try {
            beanManager = CDI.current().getBeanManager();
        } catch (Exception e){
            TransactionScopedCDIUtil.log("Can't get instance of BeanManager to process TransactionScoped CDI Event!");
        }
        if (beanManager != null) {
            //TransactionScopedCDIEventHelperImpl AnnotatedType is created in Extension
            Set<Bean<?>> availableBeans = beanManager.getBeans(TransactionScopedCDIEventHelperImpl.class);
            if (null != availableBeans && !availableBeans.isEmpty()) {
                Bean<?> bean = beanManager.resolve(availableBeans);
                TransactionScopedCDIEventHelper eventHelper =
                        (TransactionScopedCDIEventHelper) beanManager.getReference(bean, bean.getBeanClass(),
                                beanManager.createCreationalContext(null));
                if (eventType.equalsIgnoreCase(INITIALIZED_EVENT))
                    eventHelper.fireInitializedEvent(new TransactionScopedCDIEventPayload());
                else
                    eventHelper.fireDestroyedEvent(new TransactionScopedCDIEventPayload());
            }
        } else {
            TransactionScopedCDIUtil.log("Can't get instance of BeanManager to process TransactionScoped CDI Event!");
        }
    }
    /* Copied from JSF */
    private static class BeanWrapper implements Bean {
        private Class beanClass;
        private InjectionTarget injectionTarget = null;

        public BeanWrapper(Class beanClass) {
            this.beanClass = beanClass;

        }

        private void setInjectionTarget(InjectionTarget injectionTarget) {
            this.injectionTarget = injectionTarget;
        }

        @Override
        public Class<?> getBeanClass() {
            return beanClass;
        }

        @Override
        public Set<InjectionPoint> getInjectionPoints() {
            return injectionTarget.getInjectionPoints();
        }

        @Override
        public String getName() {
            return null;
        }

        @Override
        public Set<Annotation> getQualifiers() {
            Set<Annotation> qualifiers = new HashSet<Annotation>();
            qualifiers.add(new DefaultAnnotationLiteral());
            qualifiers.add(new AnyAnnotationLiteral());
            return qualifiers;
        }

        public static class DefaultAnnotationLiteral extends AnnotationLiteral<Default> {
            private static final long serialVersionUID = -9065007202240742004L;

        }

        public static class AnyAnnotationLiteral extends AnnotationLiteral<Any> {
            private static final long serialVersionUID = -4700109250603725375L;
        }

        @Override
        public Class<? extends Annotation> getScope() {
            return Dependent.class;
        }

        @Override
        public Set<Class<? extends Annotation>> getStereotypes() {
            return Collections.emptySet();
        }

        @Override
        public Set<Type> getTypes() {
            Set<Type> types = new HashSet<Type>();
            types.add(beanClass);
            types.add(Object.class);
            return types;
        }

        @Override
        public boolean isAlternative() {
            return false;
        }

        @Override
        public boolean isNullable() {
            return false;
        }

        @Override
        public Object create(CreationalContext ctx) {
            Object instance = injectionTarget.produce(ctx);
            injectionTarget.inject(instance, ctx);
            injectionTarget.postConstruct(instance);
            return instance;
        }

        @Override
        public void destroy(Object instance, CreationalContext ctx) {
            injectionTarget.preDestroy(instance);
            injectionTarget.dispose(instance);
            ctx.release();
        }
    }
}