/**
 * 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.OutputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.StringTokenizer;
import java.util.concurrent.ConcurrentHashMap;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.wsdl.Definition;
import javax.wsdl.Import;
import javax.wsdl.Port;
import javax.wsdl.Service;
import javax.wsdl.Types;
import javax.wsdl.extensions.ExtensibilityElement;
import javax.wsdl.extensions.schema.Schema;
import javax.wsdl.extensions.schema.SchemaImport;
import javax.wsdl.extensions.schema.SchemaReference;
import javax.wsdl.extensions.soap.SOAPAddress;
import javax.wsdl.extensions.soap12.SOAP12Address;
import javax.wsdl.xml.WSDLWriter;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLStreamWriter;

import org.w3c.dom.Document;
import org.w3c.dom.Element;

import org.xml.sax.InputSource;

import org.apache.cxf.Bus;
import org.apache.cxf.catalog.OASISCatalogManager;
import org.apache.cxf.common.i18n.Message;
import org.apache.cxf.common.logging.LogUtils;
import org.apache.cxf.helpers.CastUtils;
import org.apache.cxf.helpers.DOMUtils;
import org.apache.cxf.helpers.XMLUtils;
import org.apache.cxf.service.model.EndpointInfo;
import org.apache.cxf.staxutils.StaxUtils;
import org.apache.cxf.transports.http.StemMatchingQueryHandler;
import org.apache.cxf.wsdl.WSDLManager;
import org.apache.cxf.wsdl11.ResourceManagerWSDLLocator;
import org.apache.cxf.wsdl11.ServiceWSDLBuilder;


public class WSDLQueryHandler implements StemMatchingQueryHandler {
    private static final Logger LOG = LogUtils.getL7dLogger(WSDLQueryHandler.class, "QueryMessages");
    private Bus bus;

    public WSDLQueryHandler(Bus b) {
        bus = b;
    }
    
    public String getResponseContentType(String baseUri, String ctx) {
        if (baseUri.toLowerCase().contains("?wsdl")
            || baseUri.toLowerCase().contains("?xsd=")) {
            return "text/xml";
        }
        return null;
    }

    public boolean isRecognizedQuery(String baseUri, String ctx, 
                                     EndpointInfo endpointInfo, boolean contextMatchExact) {
        if (baseUri != null 
            && (baseUri.contains("?") 
                && (baseUri.toLowerCase().contains("wsdl")
                || baseUri.toLowerCase().contains("xsd=")))) {
            
            int idx = baseUri.indexOf("?");
            Map<String, String> map = parseQueryString(baseUri.substring(idx + 1));
            if (map.containsKey("wsdl")
                || map.containsKey("xsd")) {
                if (contextMatchExact) {
                    return endpointInfo.getAddress().contains(ctx);
                } else {
                    // contextMatchStrategy will be "stem"
                    return endpointInfo.getAddress().contains(getStem(baseUri.substring(0, idx)));
                }
            }
        }
        return false;
    }

    public void writeResponse(String baseUri, String ctxUri,
                              EndpointInfo endpointInfo, OutputStream os) {
        try {
            int idx = baseUri.toLowerCase().indexOf("?");
            Map<String, String> params = parseQueryString(baseUri.substring(idx + 1));
            String base = baseUri.substring(0, baseUri.toLowerCase().indexOf("?"));
            String wsdl = params.get("wsdl");
            String xsd =  params.get("xsd");
            
            Map<String, Definition> mp = CastUtils.cast((Map)endpointInfo.getService()
                                                        .getProperty(WSDLQueryHandler.class.getName()));
            Map<String, SchemaReference> smp = CastUtils.cast((Map)endpointInfo.getService()
                                                        .getProperty(WSDLQueryHandler.class.getName() 
                                                                     + ".Schemas"));

            if (mp == null) {
                endpointInfo.getService().setProperty(WSDLQueryHandler.class.getName(),
                                                      new ConcurrentHashMap());
                mp = CastUtils.cast((Map)endpointInfo.getService()
                                    .getProperty(WSDLQueryHandler.class.getName()));
            }
            if (smp == null) {
                endpointInfo.getService().setProperty(WSDLQueryHandler.class.getName()
                                                      + ".Schemas",
                                                      new ConcurrentHashMap());
                smp = CastUtils.cast((Map)endpointInfo.getService()
                                    .getProperty(WSDLQueryHandler.class.getName()
                                                 + ".Schemas"));
            }
            
            if (!mp.containsKey("")) {
                Definition def = new ServiceWSDLBuilder(bus, endpointInfo.getService()).build();

                mp.put("", def);
                updateDefinition(def, mp, smp, base, endpointInfo);
            }
            
            
            Document doc;
            if (xsd == null) {
                Definition def = mp.get(wsdl);
                if (def == null) {
                    String wsdl2 = resolveWithCatalogs(OASISCatalogManager.getCatalogManager(bus),
                                                       wsdl,
                                                       base);
                    if (wsdl2 != null) {
                        def = mp.get(wsdl2);
                    }
                }
                if (def == null) {
                    throw new WSDLQueryException(new Message("WSDL_NOT_FOUND", LOG, wsdl), null);
                }
                
                synchronized (def) {
                    //writing a def is not threadsafe.  Sync on it to make sure
                    //we don't get any ConcurrentModificationExceptions
                    if (endpointInfo.getProperty("publishedEndpointUrl") != null) {
                        String publishingUrl = 
                            String.valueOf(endpointInfo.getProperty("publishedEndpointUrl"));
                        updatePublishedEndpointUrl(publishingUrl, def, endpointInfo.getName());
                    }
        
                    WSDLWriter wsdlWriter = bus.getExtension(WSDLManager.class)
                        .getWSDLFactory().newWSDLWriter();
                    def.setExtensionRegistry(bus.getExtension(WSDLManager.class).getExtensionRegistry());
                    doc = wsdlWriter.getDocument(def);
                }
            } else {
                SchemaReference si = smp.get(xsd);
                if (si == null) {
                    String xsd2 = resolveWithCatalogs(OASISCatalogManager.getCatalogManager(bus),
                                                       xsd,
                                                       base);
                    if (xsd2 != null) { 
                        si = smp.get(xsd2);
                    }
                }
                if (si == null) {
                    throw new WSDLQueryException(new Message("SCHEMA_NOT_FOUND", LOG, wsdl), null);
                }
                
                String uri = si.getReferencedSchema().getDocumentBaseURI();
                uri = resolveWithCatalogs(OASISCatalogManager.getCatalogManager(bus),
                                          uri,
                                          si.getReferencedSchema().getDocumentBaseURI());
                if (uri == null) {
                    uri = si.getReferencedSchema().getDocumentBaseURI();
                }
                ResourceManagerWSDLLocator rml = new ResourceManagerWSDLLocator(uri,
                                                                                bus);
                
                InputSource src = rml.getBaseInputSource();
                doc = XMLUtils.getParser().parse(src);
            }
            
            updateDoc(doc, base, mp, smp);
            String enc = doc.getXmlEncoding();
            if (enc == null) {
                enc = "utf-8";
            }

            XMLStreamWriter writer = StaxUtils.createXMLStreamWriter(os,
                                                                     enc);
            StaxUtils.writeNode(doc, writer, true);
            writer.flush();
        } catch (WSDLQueryException wex) {
            throw wex;
        } catch (Exception wex) {
            throw new WSDLQueryException(new Message("COULD_NOT_PROVIDE_WSDL",
                                                     LOG,
                                                     baseUri), wex);
        }
    }
    
    private void updateDoc(Document doc, String base,
                           Map<String, Definition> mp,
                           Map<String, SchemaReference> smp) {        
        List<Element> elementList = DOMUtils.findAllElementsByTagNameNS(doc.getDocumentElement(),
                                                                       "http://www.w3.org/2001/XMLSchema",
                                                                       "import");
        for (Element el : elementList) {
            String sl = el.getAttribute("schemaLocation");
            if (smp.containsKey(sl)) {
                el.setAttribute("schemaLocation", base + "?xsd=" + sl);
            }
        }
        
        elementList = DOMUtils.findAllElementsByTagNameNS(doc.getDocumentElement(),
                                                          "http://www.w3.org/2001/XMLSchema",
                                                          "include");
        for (Element el : elementList) {
            String sl = el.getAttribute("schemaLocation");
            if (smp.containsKey(sl)) {
                el.setAttribute("schemaLocation", base + "?xsd=" + sl);
            }
        }
        
        elementList = DOMUtils.findAllElementsByTagNameNS(doc.getDocumentElement(),
                                                          "http://schemas.xmlsoap.org/wsdl/",
                                                          "import");
        for (Element el : elementList) {
            String sl = el.getAttribute("location");
            if (mp.containsKey(sl)) {
                el.setAttribute("location", base + "?wsdl=" + sl);
            }
        }
        doc.setXmlStandalone(true);
    }

    static String resolveWithCatalogs(OASISCatalogManager catalogs, String start, String base) {
        String resolvedSchemaLocation = null;
        try {
            resolvedSchemaLocation = catalogs.getCatalog().resolveSystem(start);
            if (resolvedSchemaLocation == null) {
                resolvedSchemaLocation = catalogs.getCatalog().resolveURI(start);
            }
            if (resolvedSchemaLocation == null) {
                resolvedSchemaLocation = catalogs.getCatalog().resolvePublic(start, base);
            }
        } catch (Exception ex) {
            //ignore
        }
        return resolvedSchemaLocation;
    }
    
    protected void updateDefinition(Definition def, Map<String, Definition> done,
                                  Map<String, SchemaReference> doneSchemas,
                                  String base, EndpointInfo ei) {
        OASISCatalogManager catalogs = OASISCatalogManager.getCatalogManager(bus);    
        
        Collection<List> imports = CastUtils.cast((Collection<?>)def.getImports().values());
        for (List lst : imports) {
            List<Import> impLst = CastUtils.cast(lst);
            for (Import imp : impLst) {
                String start = imp.getLocationURI();
                String resolvedSchemaLocation = resolveWithCatalogs(catalogs, start, base);
                
                if (resolvedSchemaLocation == null) {
                    try {
                        //check to see if it's aleady in a URL format.  If so, leave it.
                        new URL(start);
                    } catch (MalformedURLException e) {
                        if (done.put(start, imp.getDefinition()) == null) {
                            updateDefinition(imp.getDefinition(), done, doneSchemas, base, ei);
                        }
                    }
                } else {
                    if (done.put(start, imp.getDefinition()) == null) {
                        done.put(resolvedSchemaLocation, imp.getDefinition());
                        updateDefinition(imp.getDefinition(), done, doneSchemas, base, ei);
                    }
                }
            }
        }      
        
        
        /* This doesn't actually work.   Setting setSchemaLocationURI on the import
        * for some reason doesn't actually result in the new URI being written
        * */
        Types types = def.getTypes();
        if (types != null) {
            for (ExtensibilityElement el 
                : CastUtils.cast((List)types.getExtensibilityElements(), ExtensibilityElement.class)) {
                if (el instanceof Schema) {
                    Schema see = (Schema)el;
                    updateSchemaImports(see, doneSchemas, base);
                }
            }
        }
    }    

    protected void updatePublishedEndpointUrl(String publishingUrl, Definition def, QName name) {
        Collection<Service> services = CastUtils.cast(def.getAllServices().values());
        for (Service service : services) {
            Collection<Port> ports = CastUtils.cast(service.getPorts().values());
            if (ports.isEmpty()) {
                continue;
            }
            
            if (name == null) {
                setSoapAddressLocationOn(ports.iterator().next(), publishingUrl);
                break; // only update the first port since we don't target any specific port
            } else {
                for (Port port : ports) {
                    if (name.getLocalPart().equals(port.getName())) {
                        setSoapAddressLocationOn(port, publishingUrl);
                    }
                }
            }
        }
    }
    
    private void setSoapAddressLocationOn(Port port, String url) {
        List extensions = port.getExtensibilityElements();
        for (Object extension : extensions) {
            if (extension instanceof SOAP12Address) {
                ((SOAP12Address)extension).setLocationURI(url);
            } else if (extension instanceof SOAPAddress) {
                ((SOAPAddress)extension).setLocationURI(url);
            }
        }
    }
    
    protected void updateSchemaImports(Schema schema,
                                           Map<String, SchemaReference> doneSchemas,
                                           String base) {
        OASISCatalogManager catalogs = OASISCatalogManager.getCatalogManager(bus);    
        Collection<List>  imports = CastUtils.cast((Collection<?>)schema.getImports().values());
        for (List lst : imports) {
            List<SchemaImport> impLst = CastUtils.cast(lst);
            for (SchemaImport imp : impLst) {
                String start = imp.getSchemaLocationURI();
                if (start != null && !doneSchemas.containsKey(start)) {
                    String resolvedSchemaLocation = resolveWithCatalogs(catalogs, start, base);
                    if (resolvedSchemaLocation == null) {
                        try {
                            //check to see if it's aleady in a URL format.  If so, leave it.
                            new URL(start);
                        } catch (MalformedURLException e) {
                            if (doneSchemas.put(start, imp) == null) {
                                updateSchemaImports(imp.getReferencedSchema(), doneSchemas, base);
                            }
                        }
                    } else {
                        if (doneSchemas.put(start, imp) == null) {
                            doneSchemas.put(resolvedSchemaLocation, imp);
                            updateSchemaImports(imp.getReferencedSchema(), doneSchemas, base);
                        }
                    }
                }
            }
        }
        List<SchemaReference> includes = CastUtils.cast(schema.getIncludes());
        for (SchemaReference included : includes) {
            String start = included.getSchemaLocationURI();

            if (start != null) {
                String resolvedSchemaLocation = resolveWithCatalogs(catalogs, start, base);
                if (resolvedSchemaLocation == null) {
                    if (!doneSchemas.containsKey(start)) {
                        try {
                            //check to see if it's aleady in a URL format.  If so, leave it.
                            new URL(start);
                        } catch (MalformedURLException e) {
                            if (doneSchemas.put(start, included) == null) {
                                updateSchemaImports(included.getReferencedSchema(), doneSchemas, base);
                            }
                        }
                    }
                } else if (!doneSchemas.containsKey(start) 
                    || !doneSchemas.containsKey(resolvedSchemaLocation)) {
                    doneSchemas.put(start, included);
                    doneSchemas.put(resolvedSchemaLocation, included);
                    updateSchemaImports(included.getReferencedSchema(), doneSchemas, base);
                }
            }
        }
    }
    
    public boolean isRecognizedQuery(String baseUri, String ctx, EndpointInfo endpointInfo) {
        return isRecognizedQuery(baseUri, ctx, endpointInfo, false);
    }
    
      
    private String getStem(String baseURI) {
        
        URL url = null;
        try {
            url = new URL(baseURI);
        } catch (MalformedURLException e) {
            LOG.log(Level.WARNING, "URL creation failed: ", e);
        }
        if (url != null) {
            baseURI = url.getPath();
            int idx = baseURI.lastIndexOf('/');
            if (idx != -1) {
                baseURI = baseURI.substring(0, idx);
            }
        }        
        return baseURI;
    }
    
    static Map<String, String> parseQueryString(String s) {
        Map<String, String> ht = new HashMap<String, String>();
        StringTokenizer st = new StringTokenizer(s, "&");
        while (st.hasMoreTokens()) {
            String pair = (String)st.nextToken();
            int pos = pair.indexOf('=');
            if (pos == -1) {
                ht.put(pair.toLowerCase(), "");
            } else {
                ht.put(pair.substring(0, pos).toLowerCase(),
                       pair.substring(pos + 1));
            }
        }
        return ht;
    }
     
}
