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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2013-2015 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
 * http://glassfish.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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 * 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
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 */

package org.glassfish.tyrus.gf.cdi;

import java.lang.annotation.Annotation;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.logging.Logger;

import javax.enterprise.context.spi.CreationalContext;
import javax.enterprise.inject.spi.AnnotatedType;
import javax.enterprise.inject.spi.BeanManager;
import javax.enterprise.inject.spi.InjectionTarget;
import javax.naming.InitialContext;
import javax.naming.NamingException;

import org.glassfish.tyrus.core.ComponentProvider;

/**
 * Provides the instance for CDI class.
 *
 * @author Stepan Kopriva (stepan.kopriva at oracle.com)
 */
public class CdiComponentProvider extends ComponentProvider {

    private final BeanManager beanManager;

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

    private final boolean managerRetrieved;

    private final Map cdiBeanToContext;

    /**
     * Constructor.
     * 
     * Looks up the {@link BeanManager} which is later used to provide the instance.
     *
     * @throws javax.naming.NamingException
     */
    public CdiComponentProvider() throws NamingException {
        cdiBeanToContext = new ConcurrentHashMap();
        InitialContext ic = new InitialContext();
        BeanManager manager = null;

        try {
            manager = (BeanManager) ic.lookup("java:comp/BeanManager");
        } catch (Exception e) {
            LOGGER.fine(e.getMessage());
        } finally {
            beanManager = manager;
            managerRetrieved = (beanManager != null);
        }
    }

    @Override
    public boolean isApplicable(Class c) {
        Annotation[] annotations = c.getAnnotations();

        for (Annotation annotation : annotations) {
            String annotationClassName = annotation.annotationType().getCanonicalName();
            if (annotationClassName.equals("javax.ejb.Singleton")
                    || annotationClassName.equals("javax.ejb.Stateful")
                    || annotationClassName.equals("javax.ejb.Stateless")) {
                return false;
            }
        }

        return managerRetrieved;
    }

    @SuppressWarnings("unchecked")
    @Override
    public  Object create(Class c) {
        if (managerRetrieved) {
            synchronized (beanManager) {
                T managedObject;
                AnnotatedType annotatedType = beanManager.createAnnotatedType(c);
                InjectionTarget it = beanManager.createInjectionTarget(annotatedType);
                CreationalContext cc = beanManager.createCreationalContext(null);
                managedObject = (T) it.produce(cc);
                it.inject(managedObject, cc);
                it.postConstruct(managedObject);
                cdiBeanToContext.put(managedObject, new CdiInjectionContext(it, cc));

                return managedObject;
            }
        } else {
            return null;
        }
    }

    @Override
    public boolean destroy(Object o) {
        //if the object is not in map, nothing happens
        if (cdiBeanToContext.containsKey(o)) {
            cdiBeanToContext.get(o).cleanup(o);
            cdiBeanToContext.remove(o);
            return true;
        }

        return false;
    }

    private static class CdiInjectionContext {
        final InjectionTarget it;
        final CreationalContext cc;

        CdiInjectionContext(InjectionTarget it, CreationalContext cc) {
            this.it = it;
            this.cc = cc;
        }

        @SuppressWarnings("unchecked")
        public void cleanup(Object instance) {
            it.preDestroy(instance);
            it.dispose(instance);
            cc.release();
        }
    }
}