/*
 * 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.tuscany.sca.host.embedded.impl;

import javax.xml.namespace.QName;

import org.apache.tuscany.sca.assembly.AssemblyFactory;
import org.apache.tuscany.sca.assembly.Component;
import org.apache.tuscany.sca.assembly.ComponentService;
import org.apache.tuscany.sca.assembly.Composite;
import org.apache.tuscany.sca.assembly.CompositeService;
import org.apache.tuscany.sca.assembly.SCABinding;
import org.apache.tuscany.sca.assembly.SCABindingFactory;
import org.apache.tuscany.sca.assembly.builder.CompositeBuilder;
import org.apache.tuscany.sca.assembly.builder.CompositeBuilderException;
import org.apache.tuscany.sca.assembly.xml.Constants;
import org.apache.tuscany.sca.contribution.ModelFactoryExtensionPoint;
import org.apache.tuscany.sca.contribution.service.ContributionService;
import org.apache.tuscany.sca.core.assembly.ActivationException;
import org.apache.tuscany.sca.core.assembly.CompositeActivator;
import org.apache.tuscany.sca.core.context.ServiceReferenceImpl;
import org.apache.tuscany.sca.host.embedded.SCADomain;
import org.apache.tuscany.sca.host.embedded.management.ComponentManager;
import org.apache.tuscany.sca.interfacedef.InterfaceContract;
import org.apache.tuscany.sca.interfacedef.java.JavaInterfaceFactory;
import org.apache.tuscany.sca.node.impl.RuntimeBootStrapper;
import org.apache.tuscany.sca.runtime.RuntimeComponent;
import org.apache.tuscany.sca.runtime.RuntimeComponentContext;
import org.apache.tuscany.sca.runtime.RuntimeComponentReference;
import org.osoa.sca.CallableReference;
import org.osoa.sca.ServiceReference;
import org.osoa.sca.ServiceRuntimeException;

/**
 * An SCA domain facade implementation.
 * 
 * @version $Rev$ $Date$
 */
public class EmbeddedSCADomain extends SCADomain {

    private String uri;
    private Composite domainComposite;
    private RuntimeBootStrapper runtime;
    private ComponentManagerImpl componentManager = new ComponentManagerImpl(this);
    
    /**
     * Constructs a new domain facade.
     *
     * @param runtimeClassLoader
     * @param domainURI
     */
    public EmbeddedSCADomain(ClassLoader runtimeClassLoader,
                            String domainURI) {
        this.uri = domainURI;
        
        // Create a runtime
        runtime = new RuntimeBootStrapper(runtimeClassLoader);
    }
    
    public void start() throws ActivationException {

        // Start the runtime
        runtime.start();
        
        // Create an in-memory domain level composite
        AssemblyFactory assemblyFactory = runtime.getAssemblyFactory();
        domainComposite = assemblyFactory.createComposite();
        domainComposite.setName(new QName(Constants.SCA10_NS, "domain"));
        domainComposite.setURI(uri);
        
        getCompositeActivator().setDomainComposite(domainComposite);
        
    }

    public void stop() throws ActivationException {
        
        // Stop the runtime
        runtime.stop();
        
        // Cleanup
        domainComposite = null;
    }
    
    public void buildComposite(Composite composite) throws CompositeBuilderException {
        runtime.buildComposite(composite);
    }

    public ContributionService getContributionService() {
        return runtime.getContributionService();
    }
    
    public CompositeBuilder getCompositeBuilder() {
        return runtime.getCompositeBuilder();
    }
    
    public CompositeActivator getCompositeActivator() {
        return runtime.getCompositeActivator();
    }
    
    public Composite getDomainComposite() {
        return domainComposite;
    }
    
    @Override
    public ComponentManager getComponentManager() {
        return componentManager;
    }
    
    @Override
    public void close() {
        super.close();
    }

    @Override
    public <B, R extends CallableReference<B>> R cast(B target) throws IllegalArgumentException {
        return (R)runtime.getProxyFactory().cast(target);
    }

    @Override
    public <B> B getService(Class<B> businessInterface, String serviceName) {
        ServiceReference<B> serviceReference = getServiceReference(businessInterface, serviceName);
        if (serviceReference == null) {
            throw new ServiceRuntimeException("Service not found: " + serviceName);
        }
        return serviceReference.getService();
    }

    private <B> ServiceReference<B> createServiceReference(Class<B> businessInterface, String targetURI) {
        try {
            AssemblyFactory assemblyFactory = runtime.getAssemblyFactory();
            Composite composite = assemblyFactory.createComposite();
            composite.setName(new QName(Constants.SCA10_TUSCANY_NS, "default"));
            RuntimeComponent component = (RuntimeComponent)assemblyFactory.createComponent();
            component.setName("default");
            component.setURI("default");
            runtime.getCompositeActivator().configureComponentContext(component);
            composite.getComponents().add(component);
            RuntimeComponentReference reference = (RuntimeComponentReference)assemblyFactory.createComponentReference();
            reference.setName("default");
            ModelFactoryExtensionPoint factories =
                runtime.getExtensionPointRegistry().getExtensionPoint(ModelFactoryExtensionPoint.class);
            JavaInterfaceFactory javaInterfaceFactory = factories.getFactory(JavaInterfaceFactory.class);
            InterfaceContract interfaceContract = javaInterfaceFactory.createJavaInterfaceContract();
            interfaceContract.setInterface(javaInterfaceFactory.createJavaInterface(businessInterface));
            reference.setInterfaceContract(interfaceContract);
            component.getReferences().add(reference);
            reference.setComponent(component);
            SCABindingFactory scaBindingFactory = factories.getFactory(SCABindingFactory.class);
            SCABinding binding = scaBindingFactory.createSCABinding();
            binding.setURI(targetURI);
            reference.getBindings().add(binding);
            return new ServiceReferenceImpl<B>(businessInterface, component, reference, binding, runtime
                .getProxyFactory(), runtime.getCompositeActivator());
        } catch (Exception e) {
            throw new ServiceRuntimeException(e);
        }
    }
    @Override
    public <B> ServiceReference<B> getServiceReference(Class<B> businessInterface, String name) {

        // Extract the component name
        String componentName;
        String serviceName;
        int i = name.indexOf('/');
        if (i != -1) {
            componentName = name.substring(0, i);
            serviceName = name.substring(i + 1);

        } else {
            componentName = name;
            serviceName = null;
        }

        // Lookup the component in the domain
        Component component = componentManager.getComponent(componentName);
        if (component == null) {
            // The component is not local in the partition, try to create a remote service ref
            return createServiceReference(businessInterface, name);
        }
        RuntimeComponentContext componentContext = null;

        // If the component is a composite, then we need to find the
        // non-composite component that provides the requested service
        if (component.getImplementation() instanceof Composite) {
            for (ComponentService componentService : component.getServices()) {
                if (serviceName == null || serviceName.equals(componentService.getName())) {
                    CompositeService compositeService = (CompositeService)componentService.getService();
                    if (compositeService != null) {
                        if (serviceName != null) {
                            serviceName = "$promoted$" + component.getName() + "$slash$" + serviceName;
                        }
                        componentContext =
                            ((RuntimeComponent)compositeService.getPromotedComponent()).getComponentContext();
                        return componentContext.createSelfReference(businessInterface, compositeService
                            .getPromotedService());
                    }
                    break;
                }
            }
            // No matching service is found
            throw new ServiceRuntimeException("Composite service not found: " + name);
        } else {
            componentContext = ((RuntimeComponent)component).getComponentContext();
            if (serviceName != null) {
                return componentContext.createSelfReference(businessInterface, serviceName);
            } else {
                return componentContext.createSelfReference(businessInterface);
            }
        }

    }

    @Override
    public String getURI() {
        return uri;
    }

}