/*
 * 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.core.spring.context;

import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.transform.TransformerFactory;

import org.apache.tuscany.sca.assembly.AssemblyFactory;
import org.apache.tuscany.sca.assembly.Composite;
import org.apache.tuscany.sca.assembly.DefaultAssemblyFactory;
import org.apache.tuscany.sca.assembly.SCABindingFactory;
import org.apache.tuscany.sca.assembly.builder.CompositeBuilderException;
import org.apache.tuscany.sca.assembly.builder.impl.CompositeBuilderImpl;
import org.apache.tuscany.sca.contribution.ModelFactoryExtensionPoint;
import org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessor;
import org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessorExtensionPoint;
import org.apache.tuscany.sca.contribution.service.ContributionException;
import org.apache.tuscany.sca.core.DefaultExtensionPointRegistry;
import org.apache.tuscany.sca.core.UtilityExtensionPoint;
import org.apache.tuscany.sca.core.spring.assembly.impl.BeanAssemblyFactory;
import org.apache.tuscany.sca.core.spring.implementation.java.impl.BeanJavaImplementationFactory;
import org.apache.tuscany.sca.implementation.java.JavaImplementationFactory;
import org.apache.tuscany.sca.implementation.java.introspect.JavaClassVisitor;
import org.apache.tuscany.sca.implementation.java.introspect.impl.AllowsPassByReferenceProcessor;
import org.apache.tuscany.sca.implementation.java.introspect.impl.BaseJavaClassVisitor;
import org.apache.tuscany.sca.implementation.java.introspect.impl.ComponentNameProcessor;
import org.apache.tuscany.sca.implementation.java.introspect.impl.ConstructorProcessor;
import org.apache.tuscany.sca.implementation.java.introspect.impl.ContextProcessor;
import org.apache.tuscany.sca.implementation.java.introspect.impl.ConversationProcessor;
import org.apache.tuscany.sca.implementation.java.introspect.impl.DestroyProcessor;
import org.apache.tuscany.sca.implementation.java.introspect.impl.EagerInitProcessor;
import org.apache.tuscany.sca.implementation.java.introspect.impl.HeuristicPojoProcessor;
import org.apache.tuscany.sca.implementation.java.introspect.impl.InitProcessor;
import org.apache.tuscany.sca.implementation.java.introspect.impl.PolicyProcessor;
import org.apache.tuscany.sca.implementation.java.introspect.impl.PropertyProcessor;
import org.apache.tuscany.sca.implementation.java.introspect.impl.ReferenceProcessor;
import org.apache.tuscany.sca.implementation.java.introspect.impl.ResourceProcessor;
import org.apache.tuscany.sca.implementation.java.introspect.impl.ScopeProcessor;
import org.apache.tuscany.sca.implementation.java.introspect.impl.ServiceProcessor;
import org.apache.tuscany.sca.interfacedef.InterfaceContractMapper;
import org.apache.tuscany.sca.interfacedef.java.JavaInterfaceFactory;
import org.apache.tuscany.sca.monitor.Monitor;
import org.apache.tuscany.sca.monitor.Problem;
import org.apache.tuscany.sca.policy.DefaultIntentAttachPointTypeFactory;
import org.apache.tuscany.sca.policy.PolicyFactory;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;

/**
 * A mini test runtime that uses the SCA assembly model variant implementation 
 * backed by Spring bean definitions.
 * 
 * @version $Rev$ $Date$
 */
public class SCADomainContext {

    private DefaultListableBeanFactory beanFactory;
    
    public SCADomainContext(String... compositeFiles) {

        // Create Spring bean factory
        beanFactory = new DefaultListableBeanFactory();

        // Create SCA assembly and SCA Java factories
        DefaultExtensionPointRegistry extensionPoints = new DefaultExtensionPointRegistry();
        ModelFactoryExtensionPoint modelFactories = extensionPoints.getExtensionPoint(ModelFactoryExtensionPoint.class);
        AssemblyFactory assemblyFactory = new BeanAssemblyFactory(new DefaultAssemblyFactory(), beanFactory);
        modelFactories.addFactory(assemblyFactory);
        UtilityExtensionPoint utilities = extensionPoints.getExtensionPoint(UtilityExtensionPoint.class);
        InterfaceContractMapper mapper = utilities.getUtility(InterfaceContractMapper.class);
        JavaInterfaceFactory javaFactory = modelFactories.getFactory(JavaInterfaceFactory.class);
        PolicyFactory policyFactory = modelFactories.getFactory(PolicyFactory.class);
        SCABindingFactory scaBindingFactory = modelFactories.getFactory(SCABindingFactory.class);
        modelFactories.addFactory(javaFactory);
        JavaImplementationFactory javaImplementationFactory = new BeanJavaImplementationFactory(beanFactory);
        modelFactories.addFactory(javaImplementationFactory);
        
        BaseJavaClassVisitor[] extensions = new BaseJavaClassVisitor[] {
            new ConstructorProcessor(assemblyFactory),
            new AllowsPassByReferenceProcessor(assemblyFactory),
            new ComponentNameProcessor(assemblyFactory),
            new ContextProcessor(assemblyFactory),
            new ConversationProcessor(assemblyFactory),
            new DestroyProcessor(assemblyFactory),
            new EagerInitProcessor(assemblyFactory),
            new InitProcessor(assemblyFactory),
            new PropertyProcessor(assemblyFactory),
            new ReferenceProcessor(assemblyFactory, javaFactory),
            new ResourceProcessor(assemblyFactory),
            new ScopeProcessor(assemblyFactory),
            new ServiceProcessor(assemblyFactory, javaFactory),
            new HeuristicPojoProcessor(assemblyFactory, javaFactory),
            new PolicyProcessor(assemblyFactory, policyFactory)
        };
        for (JavaClassVisitor e : extensions) {
            javaImplementationFactory.addClassVisitor(e);
        }

        // Populate ArtifactProcessor registry
        StAXArtifactProcessorExtensionPoint staxProcessors = extensionPoints.getExtensionPoint(StAXArtifactProcessorExtensionPoint.class);
        StAXArtifactProcessor<Composite> compositeProcessor = staxProcessors.getProcessor(Composite.class);
        
        // Create a resolver
        //FIXME The ClassLoader should be passed in 
        ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
        ModelResolverImpl resolver = new ModelResolverImpl(classLoader);

        try {
            XMLInputFactory inputFactory = XMLInputFactory.newInstance();
            
            // Read the composite files
            List<Composite> composites = new ArrayList<Composite>();
            for (String compositeFile: compositeFiles) {
                InputStream is = classLoader.getResourceAsStream(compositeFile);
                XMLStreamReader reader = inputFactory.createXMLStreamReader(is);
                Composite composite = compositeProcessor.read(reader);
                resolver.addModel(composite);
                composites.add(composite);
            }
            
            for (Composite composite: composites) {
                
                // Resolve the composite
                compositeProcessor.resolve(composite, resolver);
            }
            
            // Wire the top level component's composite
            DocumentBuilderFactory documentBuilderFactory = modelFactories.getFactory(DocumentBuilderFactory.class);
            TransformerFactory transformerFactory = modelFactories.getFactory(TransformerFactory.class);
            buildComposite(composites.get(0), assemblyFactory, scaBindingFactory,
                           documentBuilderFactory, transformerFactory, mapper);
            
        } catch (ContributionException e) {
            throw new RuntimeException(e);
        } catch (CompositeBuilderException e) {
            throw new RuntimeException(e);
        } catch (XMLStreamException e) {
            throw new RuntimeException(e);
        } 
    }
    
    private void buildComposite(Composite composite, AssemblyFactory assemblyFactory,
                                SCABindingFactory scaBindingFactory,
                                DocumentBuilderFactory documentBuilderFactory,
                                TransformerFactory transformerFactory,
                                InterfaceContractMapper interfaceContractMapper) throws CompositeBuilderException {

        Monitor monitor = new Monitor() {

            public void problem(Problem problem) {
                System.out.println("Composite assembly problem: " + problem.toString());
            }
            public List<Problem> getProblems() {
                return null;
            }
        };

        // Configure and wire the composite
        CompositeBuilderImpl compositeUtil = new CompositeBuilderImpl(assemblyFactory, scaBindingFactory, new DefaultIntentAttachPointTypeFactory(),
                                                                      documentBuilderFactory, transformerFactory, interfaceContractMapper, monitor);
        compositeUtil.build(composite);

    }

    public <B> B getService(Class<B> businessInterface, String serviceName) {
        Object bean = beanFactory.getBean(serviceName);
        return businessInterface.cast(bean);
    }

}