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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2008, Red Hat, Inc., and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jboss.weld.ejb;

import static org.jboss.weld.util.reflection.Reflections.cast;

import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Set;

import org.jboss.weld.annotated.enhanced.MethodSignature;
import org.jboss.weld.annotated.enhanced.jlr.MethodSignatureImpl;
import org.jboss.weld.ejb.spi.BusinessInterfaceDescriptor;
import org.jboss.weld.ejb.spi.EjbDescriptor;
import org.jboss.weld.ejb.spi.SubclassedComponentDescriptor;
import org.jboss.weld.ejb.spi.helpers.ForwardingEjbDescriptor;
import org.jboss.weld.util.Function;
import org.jboss.weld.util.collections.ImmutableSet;
import org.jboss.weld.util.collections.Iterables;
import org.jboss.weld.util.reflection.Reflections;


/**
 * More powerful version of {@link EjbDescriptor} that exposes Maps for some
 * metadata. The {@link EjbDescriptor} to enhance should be passed to the
 * constructor
 *
 * @author Pete Muir
 */
public class InternalEjbDescriptor extends ForwardingEjbDescriptor {

    public static  InternalEjbDescriptor of(EjbDescriptor ejbDescriptor) {
        if (ejbDescriptor instanceof InternalEjbDescriptor) {
            return cast(ejbDescriptor);
        }
        return new InternalEjbDescriptor(ejbDescriptor);
    }

    private static class BusinessInterfaceDescriptorToClassFunction implements Function, Class> {

        private static final BusinessInterfaceDescriptorToClassFunction INSTANCE = new BusinessInterfaceDescriptorToClassFunction();

        @Override
        public Class apply(BusinessInterfaceDescriptor input) {
            return input.getInterface();
        }
    }

    private final Class objectInterface;
    private final EjbDescriptor delegate;
    private final Collection removeMethodSignatures;
    private final Set> localBusinessInterfaces;
    private final Set> remoteBusinessInterfaces;

    private InternalEjbDescriptor(EjbDescriptor ejbDescriptor) {
        this.delegate = ejbDescriptor;
        this.objectInterface = findObjectInterface(ejbDescriptor.getLocalBusinessInterfaces());
        removeMethodSignatures = new ArrayList();
        if (ejbDescriptor.getRemoveMethods() != null) {
            for (Method method : ejbDescriptor.getRemoveMethods()) {
                removeMethodSignatures.add(new MethodSignatureImpl(method));
            }
        }
        this.localBusinessInterfaces = transformToClasses(getLocalBusinessInterfaces());
        this.remoteBusinessInterfaces = transformToClasses(getRemoteBusinessInterfaces());
    }

    private static Set> transformToClasses(Collection> interfaceDescriptors) {
        if (interfaceDescriptors == null) {
            return Collections.emptySet();
        }
        return ImmutableSet.copyOf(Iterables.transform(interfaceDescriptors, BusinessInterfaceDescriptorToClassFunction.INSTANCE));
    }

    @Override
    public EjbDescriptor delegate() {
        return delegate;
    }

    public Class getObjectInterface() {
        return objectInterface;
    }

    public Collection getRemoveMethodSignatures() {
        return removeMethodSignatures;
    }

    private static Class findObjectInterface(Collection> interfaces) {
        if (interfaces != null && !interfaces.isEmpty()) {
            return interfaces.iterator().next().getInterface();
        } else {
            return null;
        }
    }

    public Set> getLocalBusinessInterfacesAsClasses() {
        return localBusinessInterfaces;
    }

    public Set> getRemoteBusinessInterfacesAsClasses() {
        return remoteBusinessInterfaces;
    }

    public Class getImplementationClass() {
        if (delegate instanceof SubclassedComponentDescriptor) {
            SubclassedComponentDescriptor descriptor = Reflections.>cast(delegate);
            Class implementationClass = descriptor.getComponentSubclass();
            if (implementationClass != null) {
                return implementationClass;
            }
        }
        return delegate.getBeanClass();
    }
}