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/**
 * 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;

import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.util.concurrent.Future;
import java.util.logging.Logger;

import javax.xml.ws.Response;

import org.apache.cxf.common.i18n.Message;
import org.apache.cxf.common.logging.LogUtils;
import org.apache.cxf.endpoint.Endpoint;
import org.apache.cxf.frontend.SimpleMethodDispatcher;
import org.apache.cxf.jaxws.support.JaxWsImplementorInfo;
import org.apache.cxf.service.factory.ServiceConstructionException;
import org.apache.cxf.service.model.BindingOperationInfo;
import org.apache.cxf.service.model.OperationInfo;

public class JAXWSMethodDispatcher extends SimpleMethodDispatcher {

    private static final Logger LOG = LogUtils.getL7dLogger(JAXWSMethodDispatcher.class);

    private JaxWsImplementorInfo implInfo;
    
    public JAXWSMethodDispatcher(JaxWsImplementorInfo implInfo) {
        this.implInfo = implInfo;
    }

    public void bind(OperationInfo o, Method... methods) {
        Method [] newMethods = new Method[methods.length];
        int i = 0;
        for (Method m : methods) {
            try {
                newMethods[i] = getImplementationMethod(m);
                i++;
            } catch (NoSuchMethodException e) {
                if (m.getName().endsWith("Async")
                    && (Future.class.equals(m.getReturnType())
                        || Response.class.equals(m.getReturnType()))) {
                    newMethods[i] = m;
                    i++;
                    continue;
                }
                Class endpointClass = implInfo.getImplementorClass();
                Message msg = new Message("SEI_METHOD_NOT_FOUND", LOG, 
                                          m.getName(), endpointClass.getName());
                throw new ServiceConstructionException(msg, e);
            }
        }
        super.bind(o, newMethods);
    }

    public BindingOperationInfo getBindingOperation(Method method, Endpoint endpoint) {
        try {
            method = getImplementationMethod(method);
        } catch (NoSuchMethodException e) {
            // ignore
        }
        return super.getBindingOperation(method, endpoint);
    }
    
    public Method getImplementationMethod(Method method) throws NoSuchMethodException {
        Class endpointClass = implInfo.getImplementorClass();
        
        if (!endpointClass.isAssignableFrom(method.getDeclaringClass())) {
            try {
                Method m2 = endpointClass.getMethod(method.getName(), 
                                                 (Class[])method.getParameterTypes());
                if (Modifier.isVolatile(m2.getModifiers())) {
                    //bridge method, need to map the generics
                    Class params[] = method.getParameterTypes();
                    for (Type t : method.getGenericParameterTypes()) {
                        if (t instanceof TypeVariable) {
                            TypeVariable tv = (TypeVariable)t;
                            for (int x = 0; x < implInfo.getSEIClass().getTypeParameters().length; x++) {
                                TypeVariable t2 = implInfo.getSEIClass().getTypeParameters()[x];
                                if (t2.getName().equals(tv.getName())) {
                                    params[x] = (Class)implInfo.getSEIType().getActualTypeArguments()[x];
                                }
                            }
                        }
                    }
                    method = endpointClass.getMethod(method.getName(),
                                                     params);
                } else {
                    method = m2;
                }
                try {
                    method.setAccessible(true);
                } catch (Throwable t) {
                    //ignore
                }                
            } catch (SecurityException e) {
                throw new ServiceConstructionException(e);
            }
        }
        return method;
    }
    
}