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// Portions Copyright [2020] [Payara Foundation and/or its affiliates]

package com.sun.ejb.containers.interceptors;

import com.sun.enterprise.container.common.spi.JavaEEInterceptorBuilder;
import com.sun.enterprise.container.common.spi.JavaEEInterceptorBuilderFactory;
import com.sun.enterprise.container.common.spi.util.InterceptorInfo;

import org.jvnet.hk2.annotations.Service;
import com.sun.ejb.EJBUtils;
import com.sun.ejb.codegen.EjbOptionalIntfGenerator;
import com.sun.ejb.spi.container.OptionalLocalInterfaceProvider;
import com.sun.logging.LogDomains;

import java.util.logging.Logger;

/**
 *
 */
@Service
public class JavaEEInterceptorBuilderFactoryImpl implements JavaEEInterceptorBuilderFactory {


    private static Logger _logger = LogDomains.getLogger(JavaEEInterceptorBuilderImpl.class,
            LogDomains.CORE_LOGGER);

    @Override
    public JavaEEInterceptorBuilder createBuilder(InterceptorInfo info) throws Exception {

        Class targetObjectClass = info.getTargetClass();

        // Create an interface with all public methods of the target class
        // in order to create a dynamic proxy
        String targetObjectClassName = targetObjectClass.getName();
        String subClassIntfName = EJBUtils.getGeneratedOptionalInterfaceName(targetObjectClassName);

        EjbOptionalIntfGenerator gen = new EjbOptionalIntfGenerator(targetObjectClass.getClassLoader());
        Class subClassIntf = gen.loadClass(
                targetObjectClassName,
                subClassIntfName,
                () -> gen.generateOptionalLocalInterface(targetObjectClass, subClassIntfName)
        );

        String beanSubClassName = subClassIntfName + "__Bean__";

        // Generate a sub-class of the application's class.  Use an instance of this subclass
        // as the actual object passed back to the application.  The sub-class instance
        // delegates all public methods to the dyanamic proxy, which calls the
        // InvocationHandler.
        Class subClass = gen.loadClass(
                targetObjectClassName,
                beanSubClassName,
                () -> gen.generateOptionalLocalInterfaceSubClass(targetObjectClass, beanSubClassName, subClassIntf)
        );

        // TODO do interceptor builder once per managed bean
        InterceptorManager interceptorManager = new InterceptorManager(_logger,
                targetObjectClass.getClassLoader(), targetObjectClass.getName(),
                info);

        JavaEEInterceptorBuilderImpl builderImpl =
                new JavaEEInterceptorBuilderImpl(info, interceptorManager,
                        gen, subClassIntf, subClass);

        return builderImpl;

    }

    /**
     * Tests if a given object is a client proxy associated with an interceptor
     * invoker.
     *
     * @param obj
     * @return
     */
    @Override
    public boolean isClientProxy(Object obj) {

        Class clazz = obj.getClass();

        return (OptionalLocalInterfaceProvider.class.isAssignableFrom(clazz));
    }
    

}