/**
 * 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.jaxws.interceptors;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ResourceBundle;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.xml.namespace.QName;
import javax.xml.stream.XMLStreamWriter;
import javax.xml.ws.WebFault;

import org.apache.cxf.common.classloader.ClassLoaderUtils;
import org.apache.cxf.common.i18n.BundleUtils;
import org.apache.cxf.common.logging.LogUtils;
import org.apache.cxf.common.util.StringUtils;
import org.apache.cxf.databinding.DataWriter;
import org.apache.cxf.interceptor.Fault;
import org.apache.cxf.interceptor.FaultOutInterceptor;
import org.apache.cxf.message.FaultMode;
import org.apache.cxf.message.Message;
import org.apache.cxf.service.Service;
import org.apache.cxf.service.model.BindingOperationInfo;
import org.apache.cxf.service.model.FaultInfo;
import org.apache.cxf.service.model.MessagePartInfo;
import org.apache.cxf.service.model.OperationInfo;
import org.apache.cxf.staxutils.W3CDOMStreamWriter;

public class WebFaultOutInterceptor extends FaultOutInterceptor {

    private static final Logger LOG = LogUtils.getL7dLogger(WebFaultOutInterceptor.class);
    private static final ResourceBundle BUNDLE = BundleUtils.getBundle(WebFaultOutInterceptor.class);

    public WebFaultOutInterceptor() {
        super();
    }
    
    private QName getFaultName(WebFault wf, Class<?> cls, OperationInfo op) {
        String ns = wf.targetNamespace();
        if (StringUtils.isEmpty(ns)) {
            ns = op.getName().getNamespaceURI();
        }
        String name = wf.name();
        if (StringUtils.isEmpty(name)) {
            name = cls.getSimpleName();
        }
        return new QName(ns, name);
    }
    

    private WebFault getWebFaultAnnotation(Class<?> t) {
        WebFault fault = t.getAnnotation(WebFault.class);
        if (fault == null
            && t.getSuperclass() != null
            && Throwable.class.isAssignableFrom(t.getSuperclass())) {
            fault = getWebFaultAnnotation(t.getSuperclass());
        }
        return fault;
    }
    
    public void handleMessage(Message message) throws Fault {
        Fault f = (Fault)message.getContent(Exception.class);

        Throwable cause = f.getCause();
        WebFault fault = null;
        if (cause != null) {
            fault = getWebFaultAnnotation(cause.getClass());
        }
        if (cause instanceof Exception && fault != null) {
            Exception ex = (Exception)cause;
            Object faultInfo = null;
            try {
                Method method = cause.getClass().getMethod("getFaultInfo", new Class[0]);
                faultInfo = method.invoke(cause, new Object[0]);
            } catch (NoSuchMethodException e) {
                faultInfo = createFaultInfoBean(fault, cause);
                
            } catch (InvocationTargetException e) {
                throw new Fault(new org.apache.cxf.common.i18n.Message("INVOCATION_TARGET_EXC", BUNDLE), e);
            } catch (IllegalAccessException e) {
                throw new Fault(new org.apache.cxf.common.i18n.Message("COULD_NOT_INVOKE", BUNDLE), e);
            } catch (IllegalArgumentException e) {
                throw new Fault(new org.apache.cxf.common.i18n.Message("COULD_NOT_INVOKE", BUNDLE), e);
            }
            Service service = message.getExchange().get(Service.class);

            try {
                DataWriter<XMLStreamWriter> writer 
                    = service.getDataBinding().createWriter(XMLStreamWriter.class);
    
                OperationInfo op = message.getExchange().get(BindingOperationInfo.class).getOperationInfo();
                QName faultName = getFaultName(fault, cause.getClass(), op);
                MessagePartInfo part = getFaultMessagePart(faultName, op);
                if (f.hasDetails()) {
                    writer.write(faultInfo, part, new W3CDOMStreamWriter(f.getDetail()));
                } else {
                    writer.write(faultInfo, part, new W3CDOMStreamWriter(f.getOrCreateDetail()));
                    if (!f.getDetail().hasChildNodes()) {
                        f.setDetail(null);
                    }
                }
    
                f.setMessage(ex.getMessage());
            } catch (Exception nex) {
                //if exception occurs while writing a fault, we'll just let things continue
                //and let the rest of the chain try handling it as is.
                LOG.log(Level.WARNING, "EXCEPTION_WHILE_WRITING_FAULT", nex);
            }
        } else {
            FaultMode mode = message.get(FaultMode.class);
            if (mode == FaultMode.CHECKED_APPLICATION_FAULT) {
                //only convert checked exceptions with this
                //otherwise delegate down to the normal protocol specific stuff
                super.handleMessage(message);
            }
        }
    }

    private Object createFaultInfoBean(WebFault fault, Throwable cause) {
        if (!StringUtils.isEmpty(fault.faultBean())) {
            try {
                Class<?> cls = ClassLoaderUtils.loadClass(fault.faultBean(),
                                                          cause.getClass());
                if (cls != null) {
                    Object ret = cls.newInstance();
                    //copy props
                    Method meth[] = cause.getClass().getMethods();
                    for (Method m : meth) {
                        if (m.getParameterTypes().length == 0
                            && (m.getName().startsWith("get")
                            || m.getName().startsWith("is"))) {
                            try {
                                String name;
                                if (m.getName().startsWith("get")) {
                                    name = "set" + m.getName().substring(3);
                                } else {
                                    name = "set" + m.getName().substring(2);
                                }
                                Method m2 = cls.getMethod(name, m.getReturnType());
                                m2.invoke(ret, m.invoke(cause));
                            } catch (Exception e) {
                                //ignore
                            }
                        }
                    }
                    return ret;
                }
            } catch (ClassNotFoundException e1) {
                //ignore
            } catch (InstantiationException e) {
                //ignore
            } catch (IllegalAccessException e) {
                //ignore
            }
        }

        LOG.fine("Using @WebFault annotated class "
                 + cause.getClass().getName() 
                 + " as faultInfo since getFaultInfo() was not found");
        return cause;
    }

    private MessagePartInfo getFaultMessagePart(QName qname, OperationInfo op) {
        for (FaultInfo faultInfo : op.getFaults()) {
            for (MessagePartInfo mpi : faultInfo.getMessageParts()) {
                String ns = null;
                if (mpi.isElement()) {
                    ns = mpi.getElementQName().getNamespaceURI();
                } else {
                    ns = mpi.getTypeQName().getNamespaceURI();
                }
                if (qname.getLocalPart().equals(mpi.getConcreteName().getLocalPart()) 
                        && qname.getNamespaceURI().equals(ns)) {
                    return mpi;
                }
            }
            
        }
        return null;
    }

}
