/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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.apache.cxf.interceptor;

import java.io.IOException;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;

import org.apache.cxf.Bus;
import org.apache.cxf.binding.Binding;
import org.apache.cxf.common.logging.LogUtils;
import org.apache.cxf.endpoint.ConduitSelector;
import org.apache.cxf.endpoint.Endpoint;
import org.apache.cxf.endpoint.PreexistingConduitSelector;
import org.apache.cxf.message.Exchange;
import org.apache.cxf.message.Message;
import org.apache.cxf.phase.AbstractPhaseInterceptor;
import org.apache.cxf.phase.Phase;
import org.apache.cxf.phase.PhaseChainCache;
import org.apache.cxf.phase.PhaseInterceptorChain;
import org.apache.cxf.phase.PhaseManager;
import org.apache.cxf.service.model.BindingMessageInfo;
import org.apache.cxf.service.model.BindingOperationInfo;
import org.apache.cxf.service.model.MessageInfo;
import org.apache.cxf.transport.Conduit;
import org.apache.cxf.ws.addressing.EndpointReferenceType;

public class OutgoingChainInterceptor extends AbstractPhaseInterceptor<Message> {
    private static final Logger LOG = LogUtils.getL7dLogger(OutgoingChainInterceptor.class);
    
    private PhaseChainCache chainCache = new PhaseChainCache();
    
    public OutgoingChainInterceptor() {
        super(Phase.POST_INVOKE);
    }

    public void handleMessage(Message message) {
        Exchange ex = message.getExchange();
        BindingOperationInfo bin = ex.get(BindingOperationInfo.class);
        if (null != bin && null != bin.getOperationInfo() && bin.getOperationInfo().isOneWay()) {
            return;
        }
        Message out = ex.getOutMessage();
        if (out != null) {
            getBackChannelConduit(message);
            if (bin != null) {
                out.put(MessageInfo.class, bin.getOperationInfo().getOutput());
                out.put(BindingMessageInfo.class, bin.getOutput());
            }
            
            InterceptorChain outChain = out.getInterceptorChain();
            if (outChain == null) {
                outChain = getChain(ex);
                out.setInterceptorChain(outChain);
            }
            outChain.doIntercept(out);
        }
    }
    
    protected static Conduit getBackChannelConduit(Message message) {
        Conduit conduit = null;
        Exchange ex = message.getExchange();
        if (ex.getConduit(message) == null
            && ex.getDestination() != null) {
            try {
                EndpointReferenceType target =
                    ex.get(EndpointReferenceType.class);
                conduit = ex.getDestination().getBackChannel(ex.getInMessage(), null, target);
                ex.put(ConduitSelector.class, 
                       new PreexistingConduitSelector(conduit, ex.get(Endpoint.class)));
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        return conduit;
    }
    
    public static InterceptorChain getOutInterceptorChain(Exchange ex) {
        Bus bus = ex.get(Bus.class);
        Binding binding = ex.get(Binding.class);
        PhaseManager pm = bus.getExtension(PhaseManager.class);
        PhaseInterceptorChain chain = new PhaseInterceptorChain(pm.getOutPhases());
        
        Endpoint ep = ex.get(Endpoint.class);
        List<Interceptor> il = ep.getOutInterceptors();
        if (LOG.isLoggable(Level.FINE)) {
            LOG.fine("Interceptors contributed by endpoint: " + il);
        }
        chain.add(il);
        il = ep.getService().getOutInterceptors();
        if (LOG.isLoggable(Level.FINE)) {
            LOG.fine("Interceptors contributed by service: " + il);
        }
        chain.add(il);
        il = bus.getOutInterceptors();
        if (LOG.isLoggable(Level.FINE)) {
            LOG.fine("Interceptors contributed by bus: " + il);
        }
        chain.add(il);        
        if (binding != null) {
            il = binding.getOutInterceptors();
            if (LOG.isLoggable(Level.FINE)) {
                LOG.fine("Interceptors contributed by binding: " + il);
            }
            chain.add(il);
        }
        chain.setFaultObserver(ep.getOutFaultObserver());
        return chain;
    }

    private PhaseInterceptorChain getChain(Exchange ex) {
        Bus bus = ex.get(Bus.class);
        Binding binding = ex.get(Binding.class);
        
        Endpoint ep = ex.get(Endpoint.class);
        
        List<Interceptor> i1 = ep.getOutInterceptors();
        if (LOG.isLoggable(Level.FINE)) {
            LOG.fine("Interceptors contributed by endpoint: " + i1);
        }
        List<Interceptor> i2 = ep.getService().getOutInterceptors();
        if (LOG.isLoggable(Level.FINE)) {
            LOG.fine("Interceptors contributed by service: " + i2);
        }
        List<Interceptor> i3 = bus.getOutInterceptors();
        if (LOG.isLoggable(Level.FINE)) {
            LOG.fine("Interceptors contributed by bus: " + i3);
        }
        List<Interceptor> i4 = null;
        PhaseInterceptorChain chain;
        if (binding != null) {
            i4 = binding.getOutInterceptors();
            if (LOG.isLoggable(Level.FINE)) {
                LOG.fine("Interceptors contributed by binding: " + i4);
            }
        }
        if (i4 != null) {
            chain = chainCache.get(bus.getExtension(PhaseManager.class).getOutPhases(),
                                   i1, i2, i3, i4);
        } else {
            chain = chainCache.get(bus.getExtension(PhaseManager.class).getOutPhases(),
                                   i1, i2, i3);
        }
        
        chain.setFaultObserver(ep.getOutFaultObserver());
        return chain;
    }
    
    
}

