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package org.glassfish.jersey.gf.cdi.internal;

import javax.inject.Inject;
import javax.inject.Provider;

import javax.transaction.TransactionalException;

import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Response;
import javax.ws.rs.ext.ExceptionMapper;

import org.glassfish.hk2.api.ServiceLocator;

import org.glassfish.jersey.server.ContainerRequest;
import org.glassfish.jersey.spi.ExceptionMappers;
import org.glassfish.jersey.spi.ExtendedExceptionMapper;

/**
 * Helper class to handle exceptions thrown by JTA layer. If this mapper was not
 * registered, no {@link WebApplicationException} thrown from a transactional
 * CDI bean would get properly mapped to corresponding response.
 *
 * @author Jakub Podlesak (jakub.podlesak at oracle.com)
 */
public class TransactionalExceptionMapper implements ExtendedExceptionMapper {

    private final Provider mappers;
    private ServiceLocator locator;

    /**
     * Create new transactional exception mapper.
     *
     * @param mappers utility to find mapper delegate.
     * @param locator HK2 locator to get access to the original
     * {@link WebApplicationException} instance.
     */
    @Inject
    public TransactionalExceptionMapper(Provider mappers, ServiceLocator locator) {
        this.mappers = mappers;
        this.locator = locator;
    }

    @Override
    public Response toResponse(TransactionalException exception) {
        final ExceptionMapper mapper = mappers.get().findMapping(exception);

        if (mapper != null && mapper != this) {
            return mapper.toResponse(exception);
        } else {
            final ContainerRequest jerseyRequest = locator.getService(ContainerRequest.class);
            if (jerseyRequest != null) {
                final WebApplicationException wae =
                        (WebApplicationException) jerseyRequest.getProperty(
                            CdiComponentProvider.TRANSACTIONAL_WAE);
                if (wae != null) {
                    return wae.getResponse();
                }
            }
            throw exception;
        }
    }

    @Override
    public boolean isMappable(TransactionalException exception) {
        return true;
    }
}