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package org.glassfish.jersey.ext.cdi1x.validation.internal;

import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;

import javax.annotation.Priority;
import javax.enterprise.context.Dependent;
import javax.enterprise.context.spi.CreationalContext;
import javax.enterprise.event.Observes;
import javax.enterprise.inject.Any;
import javax.enterprise.inject.Default;
import javax.enterprise.inject.spi.AfterBeanDiscovery;
import javax.enterprise.inject.spi.AfterTypeDiscovery;
import javax.enterprise.inject.spi.AnnotatedType;
import javax.enterprise.inject.spi.Bean;
import javax.enterprise.inject.spi.BeanManager;
import javax.enterprise.inject.spi.BeforeBeanDiscovery;
import javax.enterprise.inject.spi.Extension;
import javax.enterprise.inject.spi.InjectionPoint;
import javax.enterprise.inject.spi.InjectionTarget;
import javax.enterprise.util.AnnotationLiteral;
import javax.interceptor.Interceptor;

import org.glassfish.jersey.server.model.Resource;

import org.glassfish.hk2.utilities.cache.Cache;
import org.glassfish.hk2.utilities.cache.Computable;

import org.hibernate.validator.internal.cdi.interceptor.ValidationInterceptor;

/**
 * CDI extension to register {@link CdiInterceptorWrapper}.
 *
 * @author Jakub Podlesak (jakub.podlesak at oracle.com)
 */
@Priority(value = Interceptor.Priority.PLATFORM_BEFORE + 199)
public class CdiInterceptorWrapperExtension implements Extension {

    public static final AnnotationLiteral<Default> DEFAULT_ANNOTATION_LITERAL = new AnnotationLiteral<Default>() {};
    public static final AnnotationLiteral<Any> ANY_ANNOTATION_LITERAL = new AnnotationLiteral<Any>() {};

    final Cache<Class<?>, Boolean> jaxRsResourceCache = new Cache<>(new Computable<Class<?>, Boolean>() {
        @Override
        public Boolean compute(final Class<?> clazz) {
            return Resource.from(clazz) != null;
        }
    });
    private AnnotatedType<ValidationInterceptor> interceptorAnnotatedType;

    /**
     * Register our validation interceptor wrapper.
     *
     * @param beforeBeanDiscoveryEvent CDI bootstrap event.
     * @param beanManager current bean manager.
     */
    private void beforeBeanDiscovery(@Observes BeforeBeanDiscovery beforeBeanDiscoveryEvent, final BeanManager beanManager) {
        beforeBeanDiscoveryEvent.addAnnotatedType(beanManager.createAnnotatedType(CdiInterceptorWrapper.class));
        interceptorAnnotatedType = beanManager.createAnnotatedType(ValidationInterceptor.class);
        beforeBeanDiscoveryEvent.addAnnotatedType(interceptorAnnotatedType);
    }

    /**
     * Remove the original interceptor, as we are going to proxy the calls with {@link CdiInterceptorWrapper}.
     *
     * @param afterTypeDiscovery CDI bootstrap event.
     */
    private void afterTypeDiscovery(@Observes final AfterTypeDiscovery afterTypeDiscovery) {
        afterTypeDiscovery.getInterceptors().remove(ValidationInterceptor.class);
    }

    /**
     * Register a CDI bean for the original interceptor so that we can have it injected in our wrapper.
     *
     * @param afterBeanDiscovery CDI bootstrap event.
     * @param beanManager current bean manager
     */
    private void afterBeanDiscovery(@Observes AfterBeanDiscovery afterBeanDiscovery, BeanManager beanManager) {

        // we need the injection target so that CDI could instantiate the original interceptor for us
        final AnnotatedType<ValidationInterceptor> interceptorType = interceptorAnnotatedType;
        final InjectionTarget<ValidationInterceptor> interceptorTarget = beanManager.createInjectionTarget(interceptorType);


        afterBeanDiscovery.addBean(new Bean<ValidationInterceptor>() {

            @Override
            public Class<?> getBeanClass() {
                return ValidationInterceptor.class;
            }

            @Override
            public Set<InjectionPoint> getInjectionPoints() {
                return interceptorTarget.getInjectionPoints();
            }

            @Override
            public String getName() {
                return "HibernateValidationInterceptorImpl";
            }

            @Override
            public Set<Annotation> getQualifiers() {
                return new HashSet<Annotation>() {{
                    add(DEFAULT_ANNOTATION_LITERAL);
                    add(ANY_ANNOTATION_LITERAL);
                }};
            }

            @Override
            public Class<? extends Annotation> getScope() {
                return Dependent.class;
            }

            @Override
            public Set<Class<? extends Annotation>> getStereotypes() {
                return Collections.emptySet();
            }

            @Override
            public Set<Type> getTypes() {
                return new HashSet<Type>() {{
                    add(ValidationInterceptor.class);
                    add(Object.class);
                }};
            }

            @Override
            public boolean isAlternative() {
                return false;
            }

            @Override
            public boolean isNullable() {
                return false;
            }

            @Override
            public ValidationInterceptor create(CreationalContext<ValidationInterceptor> ctx) {

                final ValidationInterceptor result = interceptorTarget.produce(ctx);
                interceptorTarget.inject(result, ctx);
                interceptorTarget.postConstruct(result);
                return result;
            }


            @Override
            public void destroy(ValidationInterceptor instance,
                                CreationalContext<ValidationInterceptor> ctx) {

                interceptorTarget.preDestroy(instance);
                interceptorTarget.dispose(instance);
                ctx.release();
            }
        });
    }
}