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package org.glassfish.jersey.server.internal.inject;

import javax.ws.rs.BadRequestException;
import javax.ws.rs.container.ContainerRequestContext;
import javax.ws.rs.core.Request;
import javax.ws.rs.core.Response;

import javax.inject.Inject;
import javax.inject.Singleton;

import org.glassfish.jersey.server.ContainerRequest;
import org.glassfish.jersey.server.internal.LocalizationMessages;
import org.glassfish.jersey.server.model.Parameter;

import org.glassfish.hk2.api.Factory;
import org.glassfish.hk2.api.ServiceLocator;

/**
 * Provides injection of {@link Request} entity value or {@link Request} instance
 * itself.
 *
 * @author Marek Potociar (marek.potociar at oracle.com)
 */
@Singleton
class EntityParamValueFactoryProvider extends AbstractValueFactoryProvider {

    /**
     * Creates new instance initialized with parameters.
     *
     * @param mpep     Injected multivaluedParameterExtractor provider.
     * @param injector Injected HK2 injector.
     */
    @Inject
    EntityParamValueFactoryProvider(MultivaluedParameterExtractorProvider mpep, ServiceLocator injector) {
        super(mpep, injector, Parameter.Source.ENTITY);
    }

    private static class EntityValueFactory extends AbstractContainerRequestValueFactory<Object> {

        private final Parameter parameter;

        public EntityValueFactory(Parameter parameter) {
            this.parameter = parameter;
        }

        @Override
        public Object provide() {
            final ContainerRequest requestContext = getContainerRequest();

            final Class<?> rawType = parameter.getRawType();

            Object value;
            if ((Request.class.isAssignableFrom(rawType) || ContainerRequestContext.class.isAssignableFrom(rawType))
                    && rawType.isInstance(requestContext)) {
                value = requestContext;
            } else {
                value = requestContext.readEntity(rawType, parameter.getType(), parameter.getAnnotations());
                if (rawType.isPrimitive() && value == null) {
                    throw new BadRequestException(Response.status(Response.Status.BAD_REQUEST)
                            .entity(LocalizationMessages.ERROR_PRIMITIVE_TYPE_NULL()).build());
                }
            }
            return value;

        }
    }

    @Override
    protected Factory<?> createValueFactory(Parameter parameter) {
        return new EntityValueFactory(parameter);
    }
}
