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// Portions Copyright [2016-2017] [Payara Foundation and/or its affiliates]

package com.sun.ejb.containers;

import com.sun.enterprise.container.common.spi.util.IndirectlySerializable;
import com.sun.enterprise.container.common.spi.util.SerializableObjectFactory;

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

/**
 * This class is used as a "proxy" or adapter between the business interface
 *  proxy and the EJBLocalObjectInvocationHandler. An instance of this class
 *  is created for each business interface of a bean. All java.lang.Object
 *  methods and mthods of IndirectlySerializable are handled by this 
 *  InvocationHandler itself while the business interface methods are delegated
 *  to the delegate (which is the EJBLocalObjectInvocaionHandler). 
 *   
 * @author Mahesh Kannan
 *
 */
public class EJBLocalObjectInvocationHandlerDelegate
    implements InvocationHandler {

    private final Class intfClass;
    private final long containerId;
    private final EJBLocalObjectInvocationHandler delegate;
    private final boolean isOptionalLocalBusinessView;
    
    EJBLocalObjectInvocationHandlerDelegate(Class intfClass, long containerId,
            EJBLocalObjectInvocationHandler delegate) {
        this.intfClass = intfClass;
        this.containerId = containerId;
        this.delegate = delegate;
        this.isOptionalLocalBusinessView = delegate.isOptionalLocalBusinessView();
    }
    
    @Override
    public Object invoke(Object proxy, Method method, Object[] args) 
        throws Throwable {
        
        Class methodClass = method.getDeclaringClass();
        Object result = null;
        if( methodClass == java.lang.Object.class ) {
            result = InvocationHandlerUtil.invokeJavaObjectMethod
                (this, method, args);
        } else if( methodClass == IndirectlySerializable.class ) {
            result = this.getSerializableObjectFactory();
        }else {
            result = delegate.invoke(intfClass, method, args);
        }
        
        return result;
    }

    EJBLocalObjectInvocationHandler getDelegate() {
        return delegate;
    }
    
    @Override
    public int hashCode() {
        return (int) containerId;
    }
    
    @Override
    public boolean equals(Object other) {
        boolean result = false;
        
        if ((other != null)
        && (other instanceof EJBLocalObjectInvocationHandlerDelegate)) {
            EJBLocalObjectInvocationHandlerDelegate otherDelegate
                    = (EJBLocalObjectInvocationHandlerDelegate) other;
            if ((containerId == otherDelegate.containerId)
            && (intfClass == otherDelegate.intfClass)) {
                EJBLocalObjectInvocationHandler otherHandler
                    = otherDelegate.delegate;
                result = (delegate.getKey() != null)
                    ? delegate.getKey().equals(otherHandler.getKey())
                    : (otherHandler.getKey() == null);
            }
        }
        
        return result;
    }

    @Override
    public String toString() {
        return intfClass.getName() + "_" + System.identityHashCode(this);
    }
    
    public SerializableObjectFactory getSerializableObjectFactory() {
        // Note: for stateful SessionBeans, the EJBLocalObjectImpl contains
        // a pointer to the EJBContext. We should not serialize it here.
        
        return new SerializableLocalObjectDelegate(
            containerId, intfClass.getName(), delegate.getKey(),
            isOptionalLocalBusinessView,
            delegate.getSfsbClientVersion());
    }
    
    private static final class SerializableLocalObjectDelegate
        implements SerializableObjectFactory
    {
        private final long containerId;
        private final String intfClassName;
        private final Object primaryKey;
        private final boolean isOptionalLocalBusinessView;
        private long version = 0L; //Used only for SFSBs
        
        SerializableLocalObjectDelegate(long containerId, 
                String intfClassName, Object primaryKey, boolean isOptionalLocalBusView, long version) {
            this.containerId = containerId;
            this.intfClassName = intfClassName;
            this.primaryKey = primaryKey;
            this.isOptionalLocalBusinessView = isOptionalLocalBusView;
            this.version = version;
        }

        @Override
        public Object createObject(long appUniqueId)
            throws IOException
        {
            BaseContainer container = EjbContainerUtilImpl.getInstance().getContainer(containerId, appUniqueId);
            // if really cannot find it
            if(container == null) {
                throw new IOException(String.format("Cannot find EJB with ID: %d", containerId));
            }
            EJBLocalObjectImpl ejbLocalBusinessObjectImpl = isOptionalLocalBusinessView ?
                container.getOptionalEJBLocalBusinessObjectImpl(primaryKey) :
                container.getEJBLocalBusinessObjectImpl(primaryKey);
            ejbLocalBusinessObjectImpl.setSfsbClientVersion(version);
            // Return the client EJBLocalObject.

            return isOptionalLocalBusinessView ?
                ejbLocalBusinessObjectImpl.getOptionalLocalBusinessClientObject() :
                ejbLocalBusinessObjectImpl.getClientObject(intfClassName);
        }
    }
}