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package com.sun.enterprise.jbi.serviceengine;

import com.sun.enterprise.deployment.ServiceRefPortInfo;
import com.sun.enterprise.deployment.NameValuePairDescriptor;
import com.sun.enterprise.webservice.ServiceEngineRtObjectFactory;
import com.sun.enterprise.webservice.ServiceEngineUtil;
import com.sun.enterprise.webservice.ServiceEngineFacade;
import com.sun.enterprise.webservice.WSClientContainer;
import com.sun.enterprise.Switch;
import com.sun.enterprise.InvocationManager;
import com.sun.enterprise.ComponentInvocation;
import com.sun.xml.ws.api.pipe.ClientPipeAssemblerContext;
import com.sun.xml.ws.api.pipe.Pipe;
import com.sun.xml.ws.api.pipe.TransportPipeFactory;

import javax.xml.namespace.QName;
import java.net.URL;

/**
 * This Factory class is used by the JAX-WS client runtime to create TransportPipe.
 * This factory is configured using the standard JAR services framework. The file
 * "META-INF/services/com.sun.xml.ws.api.pipe.TransportPipeFactory" is used for
 * this purpose. It is put in appserv-rt.jar so that it is available in the 
 * appserver classpath.
 * 
 * @author Vikas Awasthi
 */
public class JBITransportPipeFactory extends TransportPipeFactory {

    /**
     * If jbi-enabled property in the context is true or if a composite 
     * application with this consumer endpoint is deployed then a 
     * JBITransportPipe is created otherwise null is returned. 
     * Returning null from this method allows JAX-WS to use the normal 
     * invocation path by creating other relevant Tranport pipe.
     */
    public Pipe doCreate(ClientPipeAssemblerContext context) {
        
        //if service engine is not installed then return null
        ServiceEngineFacade facade =
                ServiceEngineRtObjectFactory.getInstance().getFacade();
        if(facade == null)
            return null;

        InvocationManager invmgr =
           Switch.getSwitch().getInvocationManager();
        ComponentInvocation inv = invmgr.getCurrentInvocation();
        if (inv == null || inv.getInstance() == null) {
           return null;
        }

        // ServiceEngineUtil is used here because a package level variable of 
        // WSClientContainer is used to get the portInfo
        //For all jsr109 invocations container will be WSClientContainer. The
        //normal invocations need to check if there is a composite application.
        ServiceRefPortInfo portInfo =
                (context.getContainer() instanceof WSClientContainer)?
                        ServiceEngineUtil.getPortInfo((WSClientContainer)context.getContainer(),
                                                    context.getWsdlModel().getName()):
                        null;

        if(portInfo == null) {
            if(hasRegisteredEndpointInJBI(facade, context))
                return createJBITransportPipe(facade, context);
            return null;
        }

        NameValuePairDescriptor stubProp =
                                portInfo.getStubPropertyByName("jbi-enabled");
        // In a composite application jbi-enabled flag can be used to override 
        // the client routing logic 
        if(stubProp == null) {
            if(hasRegisteredEndpointInJBI(facade, context))
                return createJBITransportPipe(facade, context);
            return null;
        }

        String jbi_enabled = stubProp.getValue();

        if(jbi_enabled.equalsIgnoreCase("true")) {
                return createJBITransportPipe(facade, context);
        }
        return null;
    }

    /**
     * Check whether the composite application has registered an endpoint for 
     * this client
     */
    private boolean hasRegisteredEndpointInJBI(ServiceEngineFacade facade,
                                               ClientPipeAssemblerContext context) {
        QName serviceName = context.getService().getServiceName();
        String endpointName = context.getWsdlModel().getName().getLocalPart();

        return facade.hasConsumerEP(serviceName, endpointName);
    }
    
    private Pipe createJBITransportPipe(ServiceEngineFacade facade, 
                                        ClientPipeAssemblerContext context) {
        URL wsdlURL = context.getService().getWSDLDocumentLocation();
        QName service = context.getService().getServiceName();
        return facade.createJBITransportPipe(context.getBinding(),
                                            wsdlURL,
                                            service,
                                            context.getWsdlModel());
    }
}