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/*
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 *
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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
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 */

package org.glassfish.cdi.transaction;

import javax.enterprise.context.spi.Contextual;
import javax.enterprise.context.spi.CreationalContext;
import javax.enterprise.inject.spi.Bean;
import javax.enterprise.inject.spi.BeanManager;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.transaction.Status;
import javax.transaction.Synchronization;
import javax.transaction.TransactionSynchronizationRegistry;
import java.util.Set;

/**
 * A wrapper for contextual instances of {@link javax.transaction.TransactionScoped} beans.
 * We need this wrapper so that the contextual instance can be destroyed when the transaction completes.
 *
 * @author JJ Snyder
 */
public class TransactionScopedBean implements Synchronization {
    private T contextualInstance;
    private Contextual contextual;
    private CreationalContext creationalContext;
    private TransactionScopedContextImpl transactionScopedContext;

    public TransactionScopedBean(Contextual contextual, CreationalContext creationalContext, TransactionScopedContextImpl transactionScopedContext) {
        this.contextual = contextual;
        this.creationalContext = creationalContext;
        this.transactionScopedContext = transactionScopedContext;
        contextualInstance = contextual.create(creationalContext);
    }

    public T getContextualInstance() {
        return contextualInstance;
    }

    @Override
    public void beforeCompletion() {
        // empty on purpose
    }

    /**
     * Destroy the contextual instance.
     */
    @Override
    public void afterCompletion(int i) {
        try {
            TransactionSynchronizationRegistry transactionSynchronizationRegistry = getTransactionSynchronizationRegistry();
            //We can't do "getResource" on TransactionSynchronizationRegistry at this stage in completion
            if (transactionSynchronizationRegistry != null) {
                if (transactionScopedContext != null) {
                    //Get list of TransactionScopedBeans for this Transaction
                    Set transactionScopedBeanSet = transactionScopedContext.beansPerTransaction.get(transactionSynchronizationRegistry);
                    if (transactionScopedBeanSet != null) {
                        //Remove the current TransactionScopedBean from list as we are destroying it now
                        if (transactionScopedBeanSet.contains(this)) {
                            transactionScopedBeanSet.remove(this);
                        }
                        //If current TransactionScopedBean is last in list, fire destroyed event and remove transaction entry from main Map
                        if (transactionScopedBeanSet.size() == 0) {
                            TransactionScopedCDIUtil.fireEvent(TransactionScopedCDIUtil.DESTORYED_EVENT);
                            transactionScopedContext.beansPerTransaction.remove(transactionSynchronizationRegistry);
                        }
                        //Not updating entry in main Map with leftover TransactionScopedBeans as it should happen by reference
                    }
                }
            }
        } catch (NamingException ne) {
            TransactionScopedCDIUtil.log("Can't get instance of TransactionSynchronizationRegistry to process TransactionScoped Destroyed CDI Event!");
            ne.printStackTrace();
        } finally {
            contextual.destroy(contextualInstance, creationalContext);
        }
    }

    private TransactionSynchronizationRegistry getTransactionSynchronizationRegistry() throws NamingException {
        TransactionSynchronizationRegistry transactionSynchronizationRegistry;
        try {
            InitialContext initialContext = new InitialContext();
            transactionSynchronizationRegistry =
                    (TransactionSynchronizationRegistry) initialContext.lookup(TransactionScopedContextImpl.TRANSACTION_SYNCHRONIZATION_REGISTRY_JNDI_NAME);
        } catch (NamingException ne) {
            throw ne;
        }
        //Not checking for transaction status, it would be 6, as its in afterCompletion
        return transactionSynchronizationRegistry;
    }
}