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/* 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.flowable.engine.impl.webservice;

import java.io.IOException;
import java.net.URL;
import java.util.Arrays;
import java.util.Enumeration;
import java.util.concurrent.ConcurrentMap;

import javax.xml.namespace.QName;

import org.apache.cxf.endpoint.Client;
import org.apache.cxf.interceptor.Fault;
import org.apache.cxf.jaxws.endpoint.dynamic.JaxWsDynamicClientFactory;
import org.apache.cxf.message.Message;
import org.flowable.common.engine.api.FlowableException;
import org.flowable.engine.delegate.BpmnError;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * A CXF's synchronous web service client
 * 
 * @author Esteban Robles Luna
 */
public class CxfWebServiceClient implements SyncWebServiceClient {

    private static final Logger LOGGER = LoggerFactory.getLogger(CxfWebServiceClient.class);

    protected Client client;

    public CxfWebServiceClient(String wsdl) {
        JaxWsDynamicClientFactory dcf = JaxWsDynamicClientFactory.newInstance();
        Enumeration xjcBindingUrls;
        try {
            xjcBindingUrls = Thread.currentThread().getContextClassLoader()
                    .getResources(CxfWSDLImporter.JAXB_BINDINGS_RESOURCE);
            if (xjcBindingUrls.hasMoreElements()) {
                final URL xjcBindingUrl = xjcBindingUrls.nextElement();
                if (xjcBindingUrls.hasMoreElements()) {
                    throw new FlowableException("Several JAXB binding definitions found for flowable-cxf: "
                            + CxfWSDLImporter.JAXB_BINDINGS_RESOURCE);
                }
                this.client = dcf.createClient(wsdl, Arrays.asList(new String[] { xjcBindingUrl.toString() }));
                this.client.getRequestContext().put("org.apache.cxf.stax.force-start-document", Boolean.TRUE);
            } else {
                throw new FlowableException("The JAXB binding definitions are not found for flowable-cxf: "
                        + CxfWSDLImporter.JAXB_BINDINGS_RESOURCE);
            }
        } catch (IOException e) {
            throw new FlowableException("An error occurs creating a web-service client for WSDL '" + wsdl + "'.", e);
        }
    }

    @Override
    public Object[] send(String methodName, Object[] arguments, ConcurrentMap overridenEndpointAddresses) throws Exception {
        try {
            URL newEndpointAddress = null;
            if (overridenEndpointAddresses != null) {
                newEndpointAddress = overridenEndpointAddresses
                        .get(this.client.getEndpoint().getEndpointInfo().getName());
            }

            if (newEndpointAddress != null) {
                this.client.getRequestContext().put(Message.ENDPOINT_ADDRESS, newEndpointAddress.toExternalForm());
            }
            return client.invoke(methodName, arguments);
        } catch (Fault e) {
            LOGGER.debug("Technical error calling WS", e);
            throw new FlowableException(e.getMessage(), e);
        } catch (RuntimeException e) {
            LOGGER.debug("Technical error calling WS", e);
            throw new FlowableException(e.getMessage(), e);
        } catch (Exception e) {
            // Other exceptions should be associated to business fault defined in the service WSDL
            LOGGER.debug("Business error calling WS", e);
            throw new BpmnError(e.getClass().getName(), e.getMessage());
        }
    }
}