/*
 * 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.dubbo.rpc.protocol.webservice;

import org.apache.dubbo.common.URL;
import org.apache.dubbo.remoting.Constants;
import org.apache.dubbo.remoting.RemotingServer;
import org.apache.dubbo.remoting.http.HttpBinder;
import org.apache.dubbo.remoting.http.HttpHandler;
import org.apache.dubbo.remoting.http.servlet.DispatcherServlet;
import org.apache.dubbo.rpc.ProtocolServer;
import org.apache.dubbo.rpc.RpcContext;
import org.apache.dubbo.rpc.RpcException;
import org.apache.dubbo.rpc.protocol.AbstractProxyProtocol;

import org.apache.cxf.binding.soap.SoapTransportFactory;
import org.apache.cxf.bus.extension.ExtensionManagerBus;
import org.apache.cxf.common.util.StringUtils;
import org.apache.cxf.endpoint.Client;
import org.apache.cxf.endpoint.Server;
import org.apache.cxf.frontend.ClientProxy;
import org.apache.cxf.frontend.ClientProxyFactoryBean;
import org.apache.cxf.frontend.ServerFactoryBean;
import org.apache.cxf.interceptor.Fault;
import org.apache.cxf.service.model.OperationInfo;
import org.apache.cxf.transport.Destination;
import org.apache.cxf.transport.http.AbstractHTTPDestination;
import org.apache.cxf.transport.http.DestinationRegistry;
import org.apache.cxf.transport.http.DestinationRegistryImpl;
import org.apache.cxf.transport.http.HTTPConduit;
import org.apache.cxf.transport.http.HttpDestinationFactory;
import org.apache.cxf.transport.servlet.ServletController;
import org.apache.cxf.transport.servlet.ServletDestinationFactory;
import org.apache.cxf.transports.http.configuration.HTTPClientPolicy;
import org.apache.cxf.wsdl.service.factory.AbstractServiceConfiguration;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.Method;
import java.net.SocketTimeoutException;

import static org.apache.dubbo.common.constants.CommonConstants.DEFAULT_TIMEOUT;
import static org.apache.dubbo.common.constants.CommonConstants.PROTOCOL_SERVER;
import static org.apache.dubbo.common.constants.CommonConstants.PROTOCOL_SERVER_SERVLET;
import static org.apache.dubbo.common.constants.CommonConstants.SERVICE_PATH_PREFIX;
import static org.apache.dubbo.common.constants.CommonConstants.TIMEOUT_KEY;

/**
 * WebServiceProtocol.
 */
public class WebServiceProtocol extends AbstractProxyProtocol {

    public static final int DEFAULT_PORT = 80;

    private final ExtensionManagerBus bus = new ExtensionManagerBus();

    private SoapTransportFactory transportFactory = null;

    private ServerFactoryBean serverFactoryBean = null;

    private DestinationRegistry destinationRegistry = null;

    private HttpBinder httpBinder;

    private Server server = null;

    public WebServiceProtocol() {
        super(Fault.class);
        bus.setExtension(new ServletDestinationFactory(), HttpDestinationFactory.class);
    }

    public void setHttpBinder(HttpBinder httpBinder) {
        this.httpBinder = httpBinder;
    }

    @Override
    public int getDefaultPort() {
        return DEFAULT_PORT;
    }

    @Override
    protected <T> Runnable doExport(T impl, Class<T> type, URL url) throws RpcException {
        transportFactory = new SoapTransportFactory();
        destinationRegistry = new DestinationRegistryImpl();
        String addr = getAddr(url);
        ProtocolServer protocolServer = serverMap.get(addr);
        if (protocolServer == null) {
            RemotingServer remotingServer = httpBinder.bind(url, new WebServiceHandler());
            serverMap.put(addr, new ProxyProtocolServer(remotingServer));
        }
        serverFactoryBean = new ServerFactoryBean();
        serverFactoryBean.setAddress(url.getAbsolutePath());
        serverFactoryBean.setServiceClass(type);
        serverFactoryBean.setServiceBean(impl);
        serverFactoryBean.setBus(bus);
        serverFactoryBean.setDestinationFactory(transportFactory);
        serverFactoryBean.getServiceFactory().getConfigurations().add(new URLHashMethodNameSoapActionServiceConfiguration());
        server = serverFactoryBean.create();
        return new Runnable() {
            @Override
            public void run() {
                if (serverFactoryBean.getServer() != null) {
                    serverFactoryBean.getServer().destroy();
                }
                if (serverFactoryBean.getBus() != null) {
                    serverFactoryBean.getBus().shutdown(true);
                }
                ProtocolServer httpServer = serverMap.get(addr);
                if (httpServer != null) {
                    httpServer.close();
                    serverMap.remove(addr);
                }
            }
        };
    }

    @Override
    @SuppressWarnings("unchecked")
    protected <T> T doRefer(final Class<T> serviceType, URL url) throws RpcException {
        ClientProxyFactoryBean proxyFactoryBean = new ClientProxyFactoryBean();
        String servicePathPrefix = url.getParameter(SERVICE_PATH_PREFIX);
        if (!StringUtils.isEmpty(servicePathPrefix) && PROTOCOL_SERVER_SERVLET.equals(url.getParameter(PROTOCOL_SERVER))) {
            url = url.setPath(servicePathPrefix + "/" + url.getPath());
        }
        String key = new URL("http", url.getHost(), url.getPort(), url.getPath(), url.getParameters()).toIdentityString();

        proxyFactoryBean.setAddress(key);
        proxyFactoryBean.setServiceClass(serviceType);
        proxyFactoryBean.setBus(bus);
        T ref = (T) proxyFactoryBean.create();
        Client proxy = ClientProxy.getClient(ref);
        HTTPConduit conduit = (HTTPConduit) proxy.getConduit();
        HTTPClientPolicy policy = new HTTPClientPolicy();
        policy.setConnectionTimeout(url.getParameter(Constants.CONNECT_TIMEOUT_KEY, Constants.DEFAULT_CONNECT_TIMEOUT));
        policy.setReceiveTimeout(url.getParameter(TIMEOUT_KEY, DEFAULT_TIMEOUT));
        conduit.setClient(policy);
        return ref;
    }

    @Override
    protected int getErrorCode(Throwable e) {
        if (e instanceof Fault) {
            e = e.getCause();
        }
        if (e instanceof SocketTimeoutException) {
            return RpcException.TIMEOUT_EXCEPTION;
        } else if (e instanceof IOException) {
            return RpcException.NETWORK_EXCEPTION;
        }
        return super.getErrorCode(e);
    }

    private class WebServiceHandler implements HttpHandler<HttpServletRequest, HttpServletResponse> {

        private volatile ServletController servletController;

        @Override
        public void handle(HttpServletRequest request, HttpServletResponse response) throws IOException {
            if (servletController == null) {
                HttpServlet httpServlet = DispatcherServlet.getInstance();
                if (httpServlet == null) {
                    response.sendError(500, "No such DispatcherServlet instance.");
                    return;
                }
                synchronized (this) {
                    if (servletController == null) {

                        if (server == null) {
                            server = WebServiceProtocol.this.serverFactoryBean.getServer();
                        }
                        Destination d = WebServiceProtocol.this.transportFactory.getDestination(server.getEndpoint().getEndpointInfo(), bus);
                        destinationRegistry.addDestination((AbstractHTTPDestination) d);
                        this.servletController = new ServletController(destinationRegistry, httpServlet.getServletConfig(), httpServlet);
                    }
                }
            }
            RpcContext.getContext().setRemoteAddress(request.getRemoteAddr(), request.getRemotePort());
            try {
                servletController.invoke(request, response);
            } catch (ServletException e) {
                throw new RuntimeException(e);
            }
        }


    }

    private class URLHashMethodNameSoapActionServiceConfiguration extends AbstractServiceConfiguration {
        public String getAction(OperationInfo op, Method method) {
            String uri = op.getName().getNamespaceURI();
            String action = op.getName().getLocalPart();
            if (StringUtils.isEmpty(action)) {
                action = method.getName();
            }
            return uri + "#" + action;
        }
    }

}