/*
 * 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.openejb.core.webservices;

import org.apache.openejb.OpenEJBRuntimeException;
import org.apache.openejb.core.ivm.naming.JaxWsServiceReference;
import org.apache.openejb.loader.IO;
import org.apache.openejb.util.LogCategory;
import org.apache.openejb.util.Logger;
import org.w3c.dom.Element;

import javax.jws.WebService;
import javax.xml.bind.JAXBContext;
import javax.xml.namespace.QName;
import javax.xml.transform.Source;
import javax.xml.ws.BindingProvider;
import javax.xml.ws.Dispatch;
import javax.xml.ws.Endpoint;
import javax.xml.ws.EndpointReference;
import javax.xml.ws.Service;
import javax.xml.ws.WebServiceException;
import javax.xml.ws.WebServiceFeature;
import javax.xml.ws.handler.HandlerResolver;
import javax.xml.ws.soap.SOAPBinding;
import javax.xml.ws.spi.Provider;
import javax.xml.ws.spi.ServiceDelegate;
import javax.xml.ws.wsaddressing.W3CEndpointReference;
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.Executor;

public class ProviderWrapper extends Provider {
    public static final Logger logger = Logger.getInstance(LogCategory.OPENEJB_WS, ProviderWrapper.class);

    //
    // Magic to get our provider wrapper installed with the PortRefData
    //

    private static final ThreadLocal<ProviderWrapperData> threadPortRefs = new ThreadLocal<ProviderWrapperData>();

    public static void beforeCreate(final List<PortRefData> portRefData, final JaxWsServiceReference.WebServiceClientCustomizer customizer, final Properties properties) {
        // Axis JAXWS api is non compliant and checks system property before classloader
        // so we replace system property so this wrapper is selected.  The original value
        // is saved into an openejb property so we can load the class in the find method
        final String oldProperty = System.getProperty(JAXWSPROVIDER_PROPERTY);
        if (oldProperty != null && !oldProperty.equals(ProviderWrapper.class.getName())) {
            System.setProperty("openejb." + JAXWSPROVIDER_PROPERTY, oldProperty);
            System.setProperty(JAXWSPROVIDER_PROPERTY, ProviderWrapper.class.getName());
        }

        System.setProperty(JAXWSPROVIDER_PROPERTY, ProviderWrapper.class.getName());

        final ClassLoader oldClassLoader = Thread.currentThread().getContextClassLoader();
        if (oldClassLoader != null) {
            Thread.currentThread().setContextClassLoader(new ProviderClassLoader(oldClassLoader));
        } else {
            Thread.currentThread().setContextClassLoader(new ProviderClassLoader());
        }
        threadPortRefs.set(new ProviderWrapperData(portRefData, oldClassLoader, customizer, properties));
    }

    public static void afterCreate() {
        Thread.currentThread().setContextClassLoader(threadPortRefs.get().callerClassLoader);
        threadPortRefs.set(null);
    }

    private static class ProviderWrapperData {
        private final List<PortRefData> portRefData;
        private final ClassLoader callerClassLoader;
        private final JaxWsServiceReference.WebServiceClientCustomizer customizer;
        private final Properties properties;

        public ProviderWrapperData(final List<PortRefData> portRefData, final ClassLoader callerClassLoader, final JaxWsServiceReference.WebServiceClientCustomizer customizer, final Properties properties) {
            this.portRefData = portRefData;
            this.callerClassLoader = callerClassLoader;
            this.customizer = customizer;
            this.properties = properties;
        }
    }


    //
    // Provider wapper implementation
    //

    private final Provider delegate;
    private final List<PortRefData> portRefs;

    public ProviderWrapper() {
        delegate = findProvider();
        portRefs = threadPortRefs.get() == null ? null : threadPortRefs.get().portRefData;
    }

    public Provider getDelegate() {
        return delegate;
    }

    public ServiceDelegate createServiceDelegate(final URL wsdlDocumentLocation, final QName serviceName, final Class serviceClass) {
        ServiceDelegate serviceDelegate = delegate.createServiceDelegate(wsdlDocumentLocation, serviceName, serviceClass);
        // the PortRef list is bound to this thread when using @WebServiceRef injection
        // When using the JAX-WS API we don't need to wrap the ServiceDelegate
        if (threadPortRefs.get() != null) {
            serviceDelegate = new ServiceDelegateWrapper(serviceDelegate);

        }
        return serviceDelegate;
    }

    public Endpoint createEndpoint(final String bindingId, final Object implementor) {
        return delegate.createEndpoint(bindingId, implementor);
    }

    public Endpoint createAndPublishEndpoint(final String address, final Object implementor) {
        return delegate.createAndPublishEndpoint(address, implementor);
    }

    public W3CEndpointReference createW3CEndpointReference(final String address,
                                                           final QName serviceName,
                                                           final QName portName,
                                                           final List<Element> metadata,
                                                           final String wsdlDocumentLocation,
                                                           final List<Element> referenceParameters) {

        return (W3CEndpointReference) invoke21Delegate(delegate, createW3CEndpointReference,
            address,
            serviceName,
            portName,
            metadata,
            wsdlDocumentLocation,
            referenceParameters);
    }

    public EndpointReference readEndpointReference(final Source source) {
        return (EndpointReference) invoke21Delegate(delegate, readEndpointReference, source);
    }

    @SuppressWarnings({"unchecked"})
    public <T> T getPort(final EndpointReference endpointReference, final Class<T> serviceEndpointInterface, final WebServiceFeature... features) {
        return (T) invoke21Delegate(delegate, providerGetPort, endpointReference, serviceEndpointInterface, features);
    }

    private class ServiceDelegateWrapper extends ServiceDelegate {
        private final ServiceDelegate serviceDelegate;
        private final JaxWsServiceReference.WebServiceClientCustomizer customizer;
        private final Properties configuration;

        public ServiceDelegateWrapper(final ServiceDelegate serviceDelegate) {
            this.serviceDelegate = serviceDelegate;
            final ProviderWrapperData providerWrapperData = threadPortRefs.get();
            if (providerWrapperData != null) {
                this.customizer = providerWrapperData.customizer;
                this.configuration = providerWrapperData.properties;
            } else {
                this.customizer = null;
                this.configuration = null;
            }
        }

        private <T> T customizePort(final T port) {
            if (customizer != null && configuration != null) {
                customizer.customize(port, configuration);
            }
            return port;
        }

        public <T> T getPort(final QName portName, final Class<T> serviceEndpointInterface) {
            final T t = serviceDelegate.getPort(portName, serviceEndpointInterface);
            setProperties((BindingProvider) t, portName);
            return customizePort(t);
        }

        public <T> T getPort(final Class<T> serviceEndpointInterface) {
            final T t = serviceDelegate.getPort(serviceEndpointInterface);

            QName qname = null;
            if (serviceEndpointInterface.isAnnotationPresent(WebService.class)) {
                final WebService webService = serviceEndpointInterface.getAnnotation(WebService.class);
                final String targetNamespace = webService.targetNamespace();
                final String name = webService.name();
                if (targetNamespace != null && targetNamespace.length() > 0 && name != null && name.length() > 0) {
                    qname = new QName(targetNamespace, name);
                }
            }

            setProperties((BindingProvider) t, qname);
            return customizePort(t);
        }

        public void addPort(final QName portName, final String bindingId, final String endpointAddress) {
            serviceDelegate.addPort(portName, bindingId, endpointAddress);
        }

        public <T> Dispatch<T> createDispatch(final QName portName, final Class<T> type, final Service.Mode mode) {
            final Dispatch<T> dispatch = serviceDelegate.createDispatch(portName, type, mode);
            setProperties(dispatch, portName);
            return dispatch;
        }

        public Dispatch<Object> createDispatch(final QName portName, final JAXBContext context, final Service.Mode mode) {
            final Dispatch<Object> dispatch = serviceDelegate.createDispatch(portName, context, mode);
            setProperties(dispatch, portName);
            return dispatch;
        }

        @SuppressWarnings({"unchecked"})
        public <T> Dispatch<T> createDispatch(final QName portName, final Class<T> type, final Service.Mode mode, final WebServiceFeature... features) {
            return (Dispatch<T>) invoke21Delegate(serviceDelegate, createDispatchInterface,
                portName,
                type,
                mode,
                features);
        }

        @SuppressWarnings({"unchecked"})
        public Dispatch<Object> createDispatch(final QName portName, final JAXBContext context, final Service.Mode mode, final WebServiceFeature... features) {
            return (Dispatch<Object>) invoke21Delegate(serviceDelegate, createDispatchJaxBContext,
                portName,
                context,
                mode,
                features);
        }

        @SuppressWarnings({"unchecked"})
        public Dispatch<Object> createDispatch(
            final EndpointReference endpointReference,
            final JAXBContext context,
            final Service.Mode mode,
            final WebServiceFeature... features) {
            return (Dispatch<Object>) invoke21Delegate(serviceDelegate, createDispatchReferenceJaxB,
                endpointReference,
                context,
                mode,
                features);
        }

        @SuppressWarnings({"unchecked"})
        public <T> Dispatch<T> createDispatch(final EndpointReference endpointReference,
                                              final Class<T> type,
                                              final Service.Mode mode,
                                              final WebServiceFeature... features) {
            return (Dispatch<T>) invoke21Delegate(serviceDelegate, createDispatchReferenceClass,
                endpointReference,
                type,
                mode,
                features);

        }

        @SuppressWarnings({"unchecked"})
        public <T> T getPort(final QName portName, final Class<T> serviceEndpointInterface, final WebServiceFeature... features) {
            return customizePort((T) invoke21Delegate(serviceDelegate, serviceGetPortByQName, portName, serviceEndpointInterface, features));
        }

        @SuppressWarnings({"unchecked"})
        public <T> T getPort(final EndpointReference endpointReference, final Class<T> serviceEndpointInterface, final WebServiceFeature... features) {
            return customizePort((T) invoke21Delegate(serviceDelegate, serviceGetPortByEndpointReference, endpointReference, serviceEndpointInterface, features));
        }

        @SuppressWarnings({"unchecked"})
        public <T> T getPort(final Class<T> serviceEndpointInterface, final WebServiceFeature... features) {
            return customizePort((T) invoke21Delegate(serviceDelegate, serviceGetPortByInterface, serviceEndpointInterface, features));
        }

        public QName getServiceName() {
            return serviceDelegate.getServiceName();
        }

        public Iterator<QName> getPorts() {
            return serviceDelegate.getPorts();
        }

        public URL getWSDLDocumentLocation() {
            return serviceDelegate.getWSDLDocumentLocation();
        }

        public HandlerResolver getHandlerResolver() {
            return serviceDelegate.getHandlerResolver();
        }

        public void setHandlerResolver(final HandlerResolver handlerResolver) {
            serviceDelegate.setHandlerResolver(handlerResolver);
        }

        public Executor getExecutor() {
            return serviceDelegate.getExecutor();
        }

        public void setExecutor(final Executor executor) {
            serviceDelegate.setExecutor(executor);
        }

        private void setProperties(final BindingProvider proxy, final QName qname) {
            for (final PortRefData portRef : portRefs) {
                Class intf = null;
                if (portRef.getServiceEndpointInterface() != null) {
                    try {
                        intf = proxy.getClass().getClassLoader().loadClass(portRef.getServiceEndpointInterface());
                    } catch (final Exception e) {
                        // no-op
                    }
                }
                if (qname != null && qname.equals(portRef.getQName()) || intf != null && intf.isInstance(proxy)) {
                    // set address
                    if (!portRef.getAddresses().isEmpty()) {
                        proxy.getRequestContext().put(BindingProvider.ENDPOINT_ADDRESS_PROPERTY, portRef.getAddresses().get(0));
                    }

                    // set mtom
                    final boolean enableMTOM = portRef.isEnableMtom();
                    if (enableMTOM && proxy.getBinding() instanceof SOAPBinding) {
                        ((SOAPBinding) proxy.getBinding()).setMTOMEnabled(enableMTOM);
                    }

                    // set properties
                    for (final Map.Entry<Object, Object> entry : portRef.getProperties().entrySet()) {
                        final String name = (String) entry.getKey();
                        final String value = (String) entry.getValue();
                        proxy.getRequestContext().put(name, value);
                    }

                    return;
                }
            }
        }
    }

    private static Provider findProvider() {
        ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
        if (classLoader == null) {
            classLoader = ClassLoader.getSystemClassLoader();
        }

        // 0. System.getProperty("openejb.javax.xml.ws.spi.Provider")
        // This is so those using old axis rules still work as expected
        String providerClass = System.getProperty("openejb." + JAXWSPROVIDER_PROPERTY);
        Provider provider = createProviderInstance(providerClass, classLoader);
        if (provider != null) {
            return provider;
        }

        // 1. META-INF/services/javax.xml.ws.spi.Provider
        try {
            for (final URL url : Collections.list(classLoader.getResources("META-INF/services/" + JAXWSPROVIDER_PROPERTY))) {
                BufferedReader in = null;
                try {
                    in = new BufferedReader(new InputStreamReader(url.openStream()));

                    providerClass = in.readLine();
                    provider = createProviderInstance(providerClass, classLoader);
                    if (provider != null) {
                        return provider;
                    }
                } catch (final Exception ignored) {
                    // no-op
                } finally {
                    if (in != null) {
                        try {
                            in.close();
                        } catch (final IOException e) {
                            // no-op
                        }
                    }
                }
            }
        } catch (final Exception ingored) {
            // no-op
        }

        // 2. $java.home/lib/jaxws.properties
        final String javaHome = System.getProperty("java.home");
        final File jaxrpcPropertiesFile = new File(new File(javaHome, "lib"), "jaxrpc.properties");
        if (jaxrpcPropertiesFile.exists()) {
            try {
                final Properties properties = IO.readProperties(jaxrpcPropertiesFile);

                providerClass = properties.getProperty(JAXWSPROVIDER_PROPERTY);
                provider = createProviderInstance(providerClass, classLoader);
                if (provider != null) {
                    return provider;
                }
            } catch (final Exception ignored) {
                // no-op
            }
        }

        // 3. System.getProperty("javax.xml.ws.spi.Provider")
        providerClass = System.getProperty(JAXWSPROVIDER_PROPERTY);
        provider = createProviderInstance(providerClass, classLoader);
        if (provider != null) {
            return provider;
        }


        // 4. Use javax.xml.ws.spi.Provider default
        try {
            System.getProperties().remove(JAXWSPROVIDER_PROPERTY);
            provider = Provider.provider();
            if (provider != null && !provider.getClass().getName().equals(ProviderWrapper.class.getName())) {
                return provider;
            }
        } finally {
            // restore original jax provider property
            System.setProperty(JAXWSPROVIDER_PROPERTY, providerClass);
        }

        throw new WebServiceException("No " + JAXWSPROVIDER_PROPERTY + " implementation found");
    }

    private static Provider createProviderInstance(final String providerClass, final ClassLoader classLoader) {
        if (providerClass != null && providerClass.length() > 0 && !providerClass.equals(ProviderWrapper.class.getName())) {
            try {
                final Class<? extends Provider> clazz = classLoader.loadClass(providerClass).asSubclass(Provider.class);
                return clazz.newInstance();
            } catch (final Throwable e) {
                logger.warning("Unable to construct provider implementation " + providerClass, e);
            }
        }
        return null;
    }

    private static class ProviderClassLoader extends ClassLoader {
        private static final String PROVIDER_RESOURCE = "META-INF/services/" + JAXWSPROVIDER_PROPERTY;
        private static final URL PROVIDER_URL;

        static {
            try {
                File tempFile = null;
                try {
                    tempFile = File.createTempFile("openejb-jaxws-provider", "tmp");
                } catch (final Throwable e) {
                    final File tmp = new File("tmp");
                    if (!tmp.exists() && !tmp.mkdirs()) {
                        throw new IOException("Failed to create local tmp directory: " + tmp.getAbsolutePath());
                    }

                    tempFile = File.createTempFile("openejb-jaxws-provider", "tmp", tmp);
                }
                tempFile.deleteOnExit();
                final OutputStream out = IO.write(tempFile);
                out.write(ProviderWrapper.class.getName().getBytes());
                out.close();
                PROVIDER_URL = tempFile.toURI().toURL();
            } catch (final IOException e) {
                throw new OpenEJBRuntimeException("Cound not create openejb-jaxws-provider file");
            }
        }

        public ProviderClassLoader() {
        }

        public ProviderClassLoader(final ClassLoader parent) {
            super(parent);
        }

        public Enumeration<URL> getResources(final String name) throws IOException {
            Enumeration<URL> resources = super.getResources(name);
            if (PROVIDER_RESOURCE.equals(name)) {
                final ArrayList<URL> list = new ArrayList<URL>();
                list.add(PROVIDER_URL);
                list.addAll(Collections.list(resources));
                resources = Collections.enumeration(list);
            }
            return resources;
        }


        public URL getResource(final String name) {
            if (PROVIDER_RESOURCE.equals(name)) {
                return PROVIDER_URL;
            }
            return super.getResource(name);
        }
    }


    //
    // Delegate methods for JaxWS 2.1
    //

    private static Object invoke21Delegate(final Object delegate, final Method method, final Object... args) {
        if (method == null) {
            throw new UnsupportedOperationException("JaxWS 2.1 APIs are not supported");
        }
        try {
            return method.invoke(delegate, args);
        } catch (final IllegalAccessException e) {
            throw new WebServiceException(e);
        } catch (final InvocationTargetException e) {
            if (e.getCause() != null) {
                throw new WebServiceException(e.getCause());
            }
            throw new WebServiceException(e);
        }
    }

    // Provider methods
    private static final Method createW3CEndpointReference;
    private static final Method providerGetPort;
    private static final Method readEndpointReference;

    // ServiceDelegate methods
    private static final Method createDispatchReferenceJaxB;
    private static final Method createDispatchReferenceClass;
    private static final Method createDispatchInterface;
    private static final Method createDispatchJaxBContext;
    private static final Method serviceGetPortByEndpointReference;
    private static final Method serviceGetPortByQName;
    private static final Method serviceGetPortByInterface;

    static {
        Method method = null;
        try {
            method = Provider.class.getMethod("createW3CEndpointReference",
                String.class,
                QName.class,
                QName.class,
                List.class,
                String.class,
                List.class);
        } catch (final NoSuchMethodException e) {
            // no-op
        }
        createW3CEndpointReference = method;

        method = null;
        try {
            method = Provider.class.getMethod("getPort",
                EndpointReference.class,
                Class.class,
                WebServiceFeature[].class);
        } catch (final NoSuchMethodException e) {
            // no-op
        }
        providerGetPort = method;

        method = null;
        try {
            method = Provider.class.getMethod("readEndpointReference", Source.class);
        } catch (final NoSuchMethodException e) {
            // no-op
        }
        readEndpointReference = method;


        method = null;
        try {
            method = ServiceDelegate.class.getMethod("createDispatch",
                EndpointReference.class,
                JAXBContext.class,
                Service.Mode.class,
                WebServiceFeature[].class);
        } catch (final NoSuchMethodException e) {
            // no-op
        }
        createDispatchReferenceJaxB = method;

        method = null;
        try {
            method = ServiceDelegate.class.getMethod("createDispatch",
                EndpointReference.class,
                Class.class,
                Service.Mode.class,
                WebServiceFeature[].class);
        } catch (final NoSuchMethodException e) {
            // no-op
        }
        createDispatchReferenceClass = method;

        method = null;
        try {
            method = ServiceDelegate.class.getMethod("createDispatch",
                QName.class,
                JAXBContext.class,
                Service.Mode.class,
                WebServiceFeature[].class);
        } catch (final NoSuchMethodException e) {
            // no-op
        }
        createDispatchJaxBContext = method;

        method = null;
        try {
            method = ServiceDelegate.class.getMethod("createDispatch",
                QName.class,
                Class.class,
                Service.Mode.class,
                WebServiceFeature[].class);
        } catch (final NoSuchMethodException e) {
            // no-op
        }
        createDispatchInterface = method;

        method = null;
        try {
            method = ServiceDelegate.class.getMethod("getPort",
                EndpointReference.class,
                Class.class,
                WebServiceFeature[].class);
        } catch (final NoSuchMethodException e) {
            // no-op
        }
        serviceGetPortByEndpointReference = method;

        method = null;
        try {
            method = ServiceDelegate.class.getMethod("getPort",
                QName.class,
                Class.class,
                WebServiceFeature[].class);
        } catch (final NoSuchMethodException e) {
            // no-op
        }
        serviceGetPortByQName = method;

        method = null;
        try {
            method = ServiceDelegate.class.getMethod("getPort",
                Class.class,
                WebServiceFeature[].class);
        } catch (final NoSuchMethodException e) {
            // no-op
        }
        serviceGetPortByInterface = method;

    }
}
