/*
    * $Id: CeaResourceServer.java,v 1.9 2004/11/12 10:44:54 mch Exp $
    *
    * (C) Copyright Astrogrid...
    */
   
   package org.astrogrid.datacenter.metadata;
   import java.io.IOException;
   import java.io.StringWriter;
  import java.util.Date;
  import javax.xml.parsers.ParserConfigurationException;
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.astrogrid.applications.CeaException;
  import org.astrogrid.applications.component.CEAComponentManagerFactory;
  import org.astrogrid.config.SimpleConfig;
  import org.astrogrid.datacenter.metadata.VoDescriptionServer;
  import org.astrogrid.io.xml.XmlPrinter;
  import org.astrogrid.io.xml.XmlTagPrinter;
  import org.astrogrid.util.DomHelper;
  import org.w3c.dom.Document;
  import org.w3c.dom.Element;
  import org.w3c.dom.NodeList;
  import org.xml.sax.SAXException;
  
  /***
   * Serves the CEA resources.  Bit of a mangled fudge at the moment to get
   * the right stuff from the right bit into the right bit.
   * <p>
   * @author M Hill
   */
  
  public class CeaResourceServer implements VoResourcePlugin {
  
     protected static Log log = LogFactory.getLog(VoDescriptionServer.class);
     
     /***
      * Returns an array of VOResource elements of the metadata.  Returns a string (rather than
      * DOM element)
      * so that we can combine them easily; some DOMs do not mix well.
      */
     public String[] getVoResources() throws IOException {
  
        //add the voresource for the CEA access to the datacenter
        try {
           String ceaVoDescription = CEAComponentManagerFactory.getInstance().getMetadataService().returnRegistryEntry();
           //extract the resource elements
           Document ceaDoc = DomHelper.newDocument(ceaVoDescription);
           NodeList ceaResources = ceaDoc.getElementsByTagName("Resource");
           if (ceaResources.getLength() ==0) {
              ceaResources = ceaDoc.getElementsByTagName("vr:Resource");
           }
  
           String[] returns = new String[ceaResources.getLength()];
  
           //each resource will need a little tweaking using the PALs configuration.
           for (int i = 0; i < ceaResources.getLength(); i++) {
              
              Element resource = (Element) ceaResources.item(i);
  
              String type = resource.getAttribute("xsi:type");
              resource.setAttribute("status", "active");
              resource.setAttribute("update", VoDescriptionServer.REGISTRY_DATEFORMAT.format(new Date()));
  
              if (type.indexOf("CeaApplicationType")>-1) {
                 returns[i] = getApplicationType(resource);
              }
              else if (type.indexOf("CeaServiceType")>-1) {
                 returns[i] = getServiceType(resource);
              }
              else {
                 returns[i] = DomHelper.ElementToString(resource);
              }
           }
  
           return returns;
           
        } catch (SAXException th) {
          log.error(th+" getting CEA resources",th);
        }
        catch (ParserConfigurationException th) {
          log.error(th+" getting CEA resources",th);
        }
        catch (CeaException th) {
          log.error(th+" getting CEA resources",th);
        }
        return new String[] {} ;
     }
  
     /*** Application type seems to be some of the authority stuff plus some
      * application definition stuff.  the authority stuff is cut and pasted in
      * from the autority plugin :-( and the application stuff lifted from the given reosurce */
     public String getApplicationType(Element resource) throws IOException {
        StringWriter sw = new StringWriter();
        XmlPrinter printer = new XmlPrinter(sw, false);
        XmlTagPrinter appType = printer.newTag("Resource", new String[] {
                 "xsi:type='CeaApplicationType'",
                 "status='active'",
                 "updated='"+VoDescriptionServer.REGISTRY_DATEFORMAT.format(new Date())+"'"
             });
       VoDescriptionServer.writeIdentifier(appType, "/ceaApplication");
 
       VoDescriptionServer.writeSummary(appType);
       VoDescriptionServer.writeCuration(appType);
 
       appType.writeTag("Type", "Other"); //for the workflow builder
 
       NodeList appDefs = resource.getElementsByTagName("cea:ApplicationDefinition");
       if (appDefs.getLength() == 0) {
          throw new MetadataException("No cea:ApplicationDefinition in CEA resource "+resource);
       }
       for (int i=0;i<appDefs.getLength();i++) {
          appType.writeTag( (Element) appDefs.item(i));
       }
       appType.close();
       sw.flush();
       sw.close();
       
       return sw.toString();
    }
 
    public String getServiceType(Element resource) throws IOException {
       StringWriter sw = new StringWriter();
       XmlPrinter printer = new XmlPrinter(sw, false);
       XmlTagPrinter servType = printer.newTag("Resource", new String[] {
                "xsi:type='CeaServiceType'",
                "status='active'",
                "updated='"+VoDescriptionServer.REGISTRY_DATEFORMAT.format(new Date())+"'"
             });
       VoDescriptionServer.writeIdentifier(servType , "/ceaService");
 
       VoDescriptionServer.writeSummary(servType );
       VoDescriptionServer.writeCuration(servType );
 
       servType.writeTag("Type", "Other"); //for the workflow builder
       
       XmlTagPrinter capabilityTag = servType.newTag("vr:Capability");
       capabilityTag.writeTag("vr:StandardURL",  "http://www.astrogrid.org/maven/build/applications/");
       XmlTagPrinter sidTag = capabilityTag.newTag("vr:StandardID");
       sidTag.writeTag("vr:AuthorityID", "astrogrid.org");
       sidTag.writeTag("vr:ResourceKey", "CommonExecutionArchitucture");
 
       XmlTagPrinter intTag = servType.newTag("vr:Interface");
       intTag.writeTag("vr:Invocation", "WebService");
       intTag.writeTag("vr:AccessURL",  new String[] { "use='base'"},
 //         ServletHelper.getUrlStem()+"services/CommonExecutionConnectorService"
             SimpleConfig.getSingleton().getString("datacenter.url")+"services/CommonExecutionConnectorService"
          );
 
       //reference to CeaApplication resource
       XmlTagPrinter manappTag = servType.newTag("cea:ManagedApplications");
       XmlTagPrinter appRefTag = manappTag.newTag("cea:ApplicationReference");
       appRefTag.writeTag("AuthorityID", SimpleConfig.getSingleton().getString("datacenter.authorityId"));
       appRefTag.writeTag("ResourceKey", SimpleConfig.getSingleton().getString("datacenter.resourceKey")+"/ceaApplication");
 
       /*
       <vr:Capability>
          <vr:StandardURL>http://www.astrogrid.org/maven/build/applications/</vr:StandardURL>
          <vr:StandardID>
             <vr:AuthorityID>astrogrid.og</vr:AuthorityID>
             <vr:ResourceKey>CommonExecutionArchitucture</vr:ResourceKey>
          </vr:StandardID>
       </vr:Capability>
       <vr:Interface>
          <vr:Invocation>WebService</vr:Invocation>
          <vr:AccessURL use="base">http://localhost:8080/astrogrid-cea-server/services/CommonExecutionConnectorService</vr:AccessURL>
       </vr:Interface>
 
       <cea:ManagedApplications>
          <cea:ApplicationReference>
             <vr:AuthorityID>org.astrogrid.localhost</vr:AuthorityID>
             <vr:ResourceKey>testdsa</vr:ResourceKey>
          </cea:ApplicationReference>
       </cea:ManagedApplications>
     */
 
       servType.close();
       sw.flush();
       sw.close();
       
       return sw.toString();
 
    }
 }