package net.curisit.securis.ioc;

import java.io.IOException;
import java.lang.reflect.Method;

import javax.annotation.Priority;
import javax.interceptor.InvocationContext;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.ws.rs.Priorities;
import javax.ws.rs.container.ContainerRequestContext;
import javax.ws.rs.container.ContainerRequestFilter;
import javax.ws.rs.container.ContainerResponseContext;
import javax.ws.rs.container.ContainerResponseFilter;
import javax.ws.rs.core.Response.Status;
import javax.ws.rs.ext.Provider;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.jboss.resteasy.core.ResourceMethodInvoker;
import org.jboss.resteasy.spi.ResteasyProviderFactory;

@Provider
@Priority(Priorities.AUTHENTICATION)
public class TransactionsManager implements ContainerRequestFilter, ContainerResponseFilter {

    private static final Logger LOG = LogManager.getLogger(TransactionsManager.class);

    private EntityManagerFactory entityManagerFactory = javax.persistence.Persistence.createEntityManagerFactory("localdb");

    private EntityManager getEM() {
        return entityManagerFactory.createEntityManager();
    }

    // @Inject
    // private ThreadLocal<EntityManager> threadLocal;

    // @AroundInvoke
    public Object invoke(InvocationContext context) throws Exception {
        EntityManager em = getEM();
        if (!em.getTransaction().isActive()) {
            em.getTransaction().begin();
            LOG.info("INIT trans");
            ResteasyProviderFactory.pushContext(EntityManager.class, em);
            Object result = context.proceed();

            em.getTransaction().commit();
            LOG.info("COMMIT trans");
            return result;
        }
        LOG.info("No trans");
        Object result = context.proceed();
        return result;
    }

    @Override
    public void filter(ContainerRequestContext requestContext) throws IOException {
        ResourceMethodInvoker methodInvoker = (ResourceMethodInvoker) requestContext.getProperty("org.jboss.resteasy.core.ResourceMethodInvoker");
        Method method = methodInvoker.getMethod();
        EntityManager em = getEM();

        ResteasyProviderFactory.pushContext(EntityManager.class, em);

        if (method.isAnnotationPresent(EnsureTransaction.class)) {
            LOG.info("WE need transaction!!!");

            em.getTransaction().begin();
        }
        LOG.info("Sent to context, em: {}, {}?", em, method.toGenericString());
    }

    @Override
    public void filter(ContainerRequestContext requestContext, ContainerResponseContext responseContext) throws IOException {
        // TODO Auto-generated method stub
        // ResteasyProviderFactory.pushContext(EntityManager.class, em);
        EntityManager em = (EntityManager) ResteasyProviderFactory.getContextData(EntityManager.class);
        LOG.info("Operating on em: {}", em);

        if (em != null && em.getTransaction().isActive()) {
            LOG.info("There is transaction go ahead...");
            if (responseContext.getStatus() == Status.OK.getStatusCode()) {
                em.getTransaction().commit();
                LOG.info("COMMIT");
            } else {
                em.getTransaction().rollback();
                LOG.info("ROLLBACK");
            }
        } else {
            LOG.info("There is NO transaction");

        }
    }

}