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/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2011, Red Hat, Inc., and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.jboss.as.webservices.invocation;

import static org.jboss.as.webservices.WSMessages.MESSAGES;
import static org.jboss.as.webservices.metadata.model.AbstractEndpoint.COMPONENT_VIEW_NAME;
import static org.jboss.as.webservices.util.ASHelper.getMSCService;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.UndeclaredThrowableException;
import java.util.Collection;

import javax.management.MBeanException;
import javax.xml.ws.soap.SOAPFaultException;

import org.jboss.as.ee.component.Component;
import org.jboss.as.ee.component.ComponentView;
import org.jboss.as.naming.ManagedReference;
import org.jboss.as.webservices.WSLogger;
import org.jboss.as.webservices.injection.WSComponent;
import org.jboss.invocation.InterceptorContext;
import org.jboss.msc.service.ServiceName;
import org.jboss.wsf.spi.deployment.Endpoint;
import org.jboss.wsf.spi.invocation.Invocation;

/**
 * Invocation abstraction for all endpoint types
 *
 * @author Richard Opalka
 * @author Jim Ma
 */
abstract class AbstractInvocationHandler extends org.jboss.ws.common.invocation.AbstractInvocationHandler {

   private ServiceName componentViewName;
   private volatile ComponentView componentView;
   protected volatile ManagedReference reference;

   /**
    * Initializes component view name.
    *
    * @param endpoint web service endpoint
    */
   public void init(final Endpoint endpoint) {
       componentViewName = (ServiceName) endpoint.getProperty(COMPONENT_VIEW_NAME);
   }

   /**
    * Gets endpoint container lazily.
    *
    * @return endpoint container
    */
   protected ComponentView getComponentView() {
       // we need to check both, otherwise it is possible for
       // componentView to be initialized before reference
      if (componentView == null) {
         synchronized(this) {
            if (componentView == null) {
               componentView = getMSCService(componentViewName, ComponentView.class);
               if (componentView == null) {
            	   throw MESSAGES.cannotFindComponentView(componentViewName);
               }
               if (reference == null) {
                  try {
                      reference = componentView.createInstance();
                  } catch (Exception e) {
                      throw new RuntimeException(e);
                  }
               }
            }
         }
      }
      return componentView;
   }

   /**
    * Invokes WS endpoint.
    *
    * @param endpoint WS endpoint
    * @param wsInvocation web service invocation
    * @throws Exception if any error occurs
    */
   public void invoke(final Endpoint endpoint, final Invocation wsInvocation) throws Exception {
      try {
         // prepare for invocation
         onBeforeInvocation(wsInvocation);
         // prepare invocation data
         final ComponentView componentView = getComponentView();
         Component component = componentView.getComponent();
         //for spring integration and @FactoryType is annotated we don't need to go into ee's interceptors
         if(wsInvocation.getInvocationContext().getTargetBean() != null
                 && (endpoint.getProperty("SpringBus") != null)
                 || wsInvocation.getInvocationContext().getProperty("forceTargetBean") != null) {
             this.reference = new ManagedReference() {
                 public void release() {
                 }

                 public Object getInstance() {
                     return wsInvocation.getInvocationContext().getTargetBean();
                 }
             };
             if (component instanceof WSComponent) {
                 ((WSComponent) component).setReference(reference);
             }
         }
         final Method method = getComponentViewMethod(wsInvocation.getJavaMethod(), componentView.getViewMethods());
         final InterceptorContext context = new InterceptorContext();
         prepareForInvocation(context, wsInvocation);
         context.setMethod(method);
         context.setParameters(wsInvocation.getArgs());
         context.putPrivateData(Component.class, component);
         context.putPrivateData(ComponentView.class, componentView);
         if(wsInvocation.getInvocationContext().getProperty("forceTargetBean") != null) {
             context.putPrivateData(ManagedReference.class, reference);
         }
         // invoke method
         final Object retObj = componentView.invoke(context);
         // set return value
         wsInvocation.setReturnValue(retObj);
      }
      catch (Throwable t) {
         handleInvocationException(t);
      }
      finally {
         onAfterInvocation(wsInvocation);
      }
   }

   protected void prepareForInvocation(final InterceptorContext context, final Invocation wsInvocation) {
      // does nothing
   }

   /**
    * Translates SEI method to component view method.
    *
    * @param seiMethod SEI method
    * @param viewMethods component view methods
    * @return matching component view method
    */
   protected Method getComponentViewMethod(final Method seiMethod, final Collection viewMethods) {
       for (final Method viewMethod : viewMethods) {
           if (matches(seiMethod, viewMethod)) {
               return viewMethod;
           }
       }
       throw new IllegalStateException();
   }

   protected void handleInvocationException(final Throwable t) throws Exception {
      if (t instanceof MBeanException) {
         throw ((MBeanException) t).getTargetException();
      }
      if (t instanceof Exception) {
         if (t instanceof InvocationTargetException) {
            throw (Exception) t;
         } else {
            SOAPFaultException ex = findSoapFaultException(t);
            if (ex != null) {
               throw new InvocationTargetException(ex);
            }
            throw new InvocationTargetException(t);
         }
      }
      if (t instanceof Error) {
         throw (Error) t;
      }
      throw new UndeclaredThrowableException(t);
    }

    protected SOAPFaultException findSoapFaultException(Throwable ex) {
        if (ex instanceof SOAPFaultException) {
            return (SOAPFaultException) ex;
        }
        if (ex.getCause() != null) {
            return findSoapFaultException(ex.getCause());
        }
        return null;
    }

   /**
    * Compares two methods if they are identical.
    *
    * @param seiMethod reference method
    * @param viewMethod target method
    * @return true if they match, false otherwise
    */
   private boolean matches(final Method seiMethod, final Method viewMethod) {
       if (!seiMethod.getName().equals(viewMethod.getName())) return false;
       final Class[] sourceParams = seiMethod.getParameterTypes();
       final Class[] targetParams = viewMethod.getParameterTypes();
       if (sourceParams.length != targetParams.length) return false;
       for (int i = 0; i < sourceParams.length; i++) {
           if (!sourceParams[i].equals(targetParams[i])) return false;
       }
       return true;
   }

}