/**
 * 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.cxf.transport.http;

import java.io.IOException;
import java.net.MalformedURLException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;

import javax.annotation.PostConstruct;
import javax.annotation.Resource;
import javax.wsdl.Port;
import javax.wsdl.extensions.http.HTTPAddress;
import javax.wsdl.extensions.soap.SOAPAddress;
import javax.xml.namespace.QName;

import org.apache.cxf.Bus;
import org.apache.cxf.configuration.Configurer;
import org.apache.cxf.configuration.jsse.TLSClientParameters;
import org.apache.cxf.service.Service;
import org.apache.cxf.service.model.BindingInfo;
import org.apache.cxf.service.model.EndpointInfo;
import org.apache.cxf.service.model.ServiceInfo;
import org.apache.cxf.transport.AbstractTransportFactory;
import org.apache.cxf.transport.Conduit;
import org.apache.cxf.transport.ConduitInitiator;
import org.apache.cxf.transport.ConduitInitiatorManager;
import org.apache.cxf.transport.https.HttpsURLConnectionFactory;
import org.apache.cxf.ws.addressing.EndpointReferenceType;
import org.apache.cxf.wsdl.http.AddressType;
import org.apache.cxf.wsdl11.WSDLEndpointFactory;


/**
 * As a ConduitInitiator, this class sets up new HTTPConduits for particular
 * endpoints.
 *
 * TODO: Document WSDLEndpointFactory
 *
 */
public abstract class AbstractHTTPTransportFactory 
    extends AbstractTransportFactory 
    implements ConduitInitiator, WSDLEndpointFactory {

    /**
     * This constant holds the prefixes served by this factory.
     */
    private static final Set<String> URI_PREFIXES = new HashSet<String>();
    static {
        URI_PREFIXES.add("http://");
        URI_PREFIXES.add("https://");
    }

    /**
     * The CXF Bus which this HTTPTransportFactory
     * is governed.
     */
    protected Bus bus;
  
    /**
     * This collection contains "activationNamespaces" which is synominous
     * with "transportId"s. 
     */
    protected Collection<String> activationNamespaces;

    /**
     * This method is used by Spring to inject the bus.
     * @param b The CXF bus.
     */
    @Resource(name = "cxf")
    public void setBus(Bus b) {
        bus = b;
    }

    /**
     * This method returns the CXF Bus under which this HTTPTransportFactory
     * is governed.
     */
    public Bus getBus() {
        return bus;
    }

    /**
     * This call is used by CXF ExtensionManager to inject the activationNamespaces
     * @param ans The transport ids.
     */
    
    public void setActivationNamespaces(Collection<String> ans) {
        activationNamespaces = ans;
    }

    /**
     * This call gets called after this class is instantiated by Spring.
     * It registers itself as a ConduitInitiator and DestinationFactory under
     * the many names that are considered "transportIds" (which are currently
     * named "activationNamespaces").
     */
    @PostConstruct
    public void registerWithBindingManager() {
        if (null == bus) {
            return;
        }
        
        if (getTransportIds() == null) {
            setTransportIds(new ArrayList<String>(activationNamespaces));
        } else if (activationNamespaces == null) {
            activationNamespaces = getTransportIds();
        }
        
        ConduitInitiatorManager cim = bus.getExtension(ConduitInitiatorManager.class);
        //Note, activationNamespaces can be null
        if (null != cim && null != activationNamespaces) {
            for (String ns : activationNamespaces) {
                cim.registerConduitInitiator(ns, this);
            }
        }
    }

    /**
     * This call creates a new HTTPConduit for the endpoint. It is equivalent
     * to calling getConduit without an EndpointReferenceType.
     */
    public Conduit getConduit(EndpointInfo endpointInfo) throws IOException {
        return getConduit(endpointInfo, endpointInfo.getTarget());
    }

    /**
     * This call creates a new HTTP Conduit based on the EndpointInfo and
     * EndpointReferenceType.
     * TODO: What are the formal constraints on EndpointInfo and 
     * EndpointReferenceType values?
     */
    public Conduit getConduit(
            EndpointInfo endpointInfo,
            EndpointReferenceType target
    ) throws IOException {
        HTTPConduit conduit = target == null
            ? new HTTPConduit(bus, endpointInfo)
            : new HTTPConduit(bus, endpointInfo, target);
        
        // Spring configure the conduit.  
        configure(conduit);
        conduit.finalizeConfig();
        return conduit;
    }

    public EndpointInfo createEndpointInfo(
        ServiceInfo serviceInfo, 
        BindingInfo b, 
        Port        port
    ) {
        if (port != null) {
            List ees = port.getExtensibilityElements();
            for (Iterator itr = ees.iterator(); itr.hasNext();) {
                Object extensor = itr.next();
    
                if (extensor instanceof HTTPAddress) {
                    final HTTPAddress httpAdd = (HTTPAddress)extensor;
    
                    EndpointInfo info = new HttpEndpointInfo(serviceInfo, 
                                "http://schemas.xmlsoap.org/wsdl/http/");
                    info.setAddress(httpAdd.getLocationURI());
                    info.addExtensor(httpAdd);
                    return info;
                } else if (extensor instanceof AddressType) {
                    final AddressType httpAdd = (AddressType)extensor;
    
                    EndpointInfo info = 
                        new HttpEndpointInfo(serviceInfo, 
                                "http://schemas.xmlsoap.org/wsdl/http/");
                    info.setAddress(httpAdd.getLocation());
                    info.addExtensor(httpAdd);
                    return info;
                }
            }
        }
        HttpEndpointInfo hei = new HttpEndpointInfo(serviceInfo, 
            "http://schemas.xmlsoap.org/wsdl/http/");
        AddressType at = new HttpAddressType();
        hei.addExtensor(at);
        
        return hei;
    }

    public void createPortExtensors(EndpointInfo ei, Service service) {
        // TODO
    }

    public Set<String> getUriPrefixes() {
        return URI_PREFIXES;
    }

    /**
     * This call uses the Configurer from the bus to configure
     * a bean.
     * 
     * @param bean
     */
    protected void configure(Object bean) {
        Configurer configurer = bus.getExtension(Configurer.class);
        if (null != configurer) {
            configurer.configureBean(bean);
        }
    }

    /**
     * This static call creates a connection factory based on
     * the existence of the SSL (TLS) client side configuration. 
     */
    static HttpURLConnectionFactory getConnectionFactory(
        HTTPConduit configuredConduit
    ) {
        HttpURLConnectionFactory fac = null;
        boolean useHttps = false;

        try {
            String address = configuredConduit.getAddress();
            if (address != null 
                && address.startsWith(HttpsURLConnectionFactory.HTTPS_URL_PROTOCOL_ID + ":/")) {
                useHttps = true;
            }
        } catch (MalformedURLException e) {
            //ignore, just use info based on Tls
        }
        if (useHttps 
            || configuredConduit.getTlsClientParameters() != null) {
            
            TLSClientParameters params = configuredConduit.getTlsClientParameters();
            if (params == null) {
                params = new TLSClientParameters(); //use defaults
            }
            fac = new HttpsURLConnectionFactory(params);
        } else {
            fac = new HttpURLConnectionFactoryImpl();
        }
        return fac;
    }   
    
    private static class HttpEndpointInfo extends EndpointInfo {
        AddressType saddress;
        HttpEndpointInfo(ServiceInfo serv, String trans) {
            super(serv, trans);
        }
        public void setAddress(String s) {
            super.setAddress(s);
            if (saddress != null) {
                saddress.setLocation(s);
            }
        }

        public void addExtensor(Object el) {
            super.addExtensor(el);
            if (el instanceof AddressType) {
                saddress = (AddressType)el;
            }
        }
    }    
    
    private static class HttpAddressType extends AddressType 
        implements HTTPAddress, SOAPAddress {
        public HttpAddressType() {
            super();
            setElementType(new QName("http://schemas.xmlsoap.org/wsdl/soap/", "address"));
        }
        
        public String getLocationURI() {
            return getLocation();
        }

        public void setLocationURI(String locationURI) {
            setLocation(locationURI);
        }
        
    }

}
