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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.injection;

import java.lang.annotation.Annotation;
import java.util.List;

import javax.enterprise.context.spi.CreationalContext;
import javax.enterprise.inject.spi.Bean;

import javassist.util.proxy.ProxyObject;
import org.jboss.weld.bean.proxy.BeanInstance;
import org.jboss.weld.bean.proxy.CombinedInterceptorAndDecoratorStackMethodHandler;
import org.jboss.weld.bean.proxy.ProxyFactory;
import org.jboss.weld.bean.proxy.TargetBeanInstance;
import org.jboss.weld.introspector.WeldConstructor;
import org.jboss.weld.manager.BeanManagerImpl;

/**
 * A wrapper on a {@link ConstructorInjectionPoint}, to be used if a proxy subclass is instantiated instead of the
 * original (e.g. because the original is an abstract {@link javax.decorator.Decorator})
 * 
 * This is a wrapper class, it is not thread-safe and any instance of this class should be used only for temporarily
 * enhancing the bean instance creation process.
 *
 * @author Marius Bogoevici
 * @author Ales Justin
 */
// TODO Needs equals/hashcode
// TODO Would be clearer to make this either a wrapper or not
// TODO (AJ) this needs proper cleanup!
public class ProxyClassConstructorInjectionPointWrapper extends ConstructorInjectionPoint {
    private ConstructorInjectionPoint originalConstructorInjectionPoint;
    private Object decoratorDelegate = null;
    private boolean decorator;
    private final Bean bean;

    public ProxyClassConstructorInjectionPointWrapper(Bean declaringBean, WeldConstructor weldConstructor, ConstructorInjectionPoint originalConstructorInjectionPoint) {
        super(declaringBean, weldConstructor);
        this.decorator = (declaringBean instanceof javax.enterprise.inject.spi.Decorator);
        this.originalConstructorInjectionPoint = originalConstructorInjectionPoint;
        this.bean = declaringBean;
    }

    @Override
    public List> getWeldParameters() {
        return originalConstructorInjectionPoint.getWeldParameters();
    }

    @Override
    protected Object[] getParameterValues(List> parameters, Object specialVal, Class specialParam, BeanManagerImpl manager, CreationalContext creationalContext) {
        Object[] parameterValues = super.getParameterValues(parameters, specialVal, specialParam, manager, creationalContext);
        // Check if any of the injections are for a delegate
        for (ParameterInjectionPoint parameter : getWeldParameters()) {
            if (parameter.isDelegate()) {
                decoratorDelegate = parameterValues[parameter.getPosition()];
            }
        }
        return parameterValues;
    }

    @Override
    public T newInstance(final BeanManagerImpl manager, final CreationalContext creationalContext) {
        // Once the instance is created, a method handler is required regardless of whether
        // an actual bean instance is known yet.
        final T instance = super.newInstance(manager, creationalContext);
        if (decorator) {
            BeanInstance beanInstance = null;
            if (decoratorDelegate != null) {
                beanInstance = new TargetBeanInstance(decoratorDelegate);
            }
            ProxyFactory.setBeanInstance(instance, beanInstance, bean);
        } else {
            if (instance instanceof ProxyObject) {
                ((ProxyObject) instance).setHandler(new CombinedInterceptorAndDecoratorStackMethodHandler());
            }
        }
        return instance;
    }
}