package jalview.ws2.client.ebi;

import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.List;

import jalview.bin.Console;
import jalview.ws.params.ParamManager;
import jalview.ws2.actions.NullAction;
import jalview.ws2.actions.api.ActionI;
import jalview.ws2.actions.hmmer.PhmmerAction;
import jalview.ws2.api.WebService;
import jalview.ws2.client.api.AbstractWebServiceDiscoverer;
import uk.ac.dundee.compbio.hmmerclient.PhmmerClient;

public final class JobDispatcherWSDiscoverer extends AbstractWebServiceDiscoverer
{

  private static final URL DEFAULT_URL;
  static
  {
    try
    {
      DEFAULT_URL = new URL("https://www.ebi.ac.uk/Tools/services/rest/hmmer3_phmmer/");
    } catch (MalformedURLException e)
    {
      throw new ExceptionInInitializerError(e);
    }
  }
  
  private static JobDispatcherWSDiscoverer instance = null;
  private static ParamManager paramManager = null;
  
  private JobDispatcherWSDiscoverer() {}
  
  public static JobDispatcherWSDiscoverer getInstance() {
    if (instance == null)
      instance = new JobDispatcherWSDiscoverer();
    return instance;
  }
  
  public static void setParamManager(ParamManager manager)
  {
    paramManager = manager;
  }
  
  @Override
  public int getStatusForUrl(URL url)
  {
    try
    {
      return new PhmmerClient(url).testEndpoint() ? STATUS_OK : STATUS_INVALID;
    } catch (URISyntaxException e)
    {
      Console.error(e.getMessage());
      return STATUS_INVALID;
    } 
  }

  @Override
  protected String getUrlsPropertyKey()
  {
    return null;
  }

  @Override
  protected URL getDefaultUrl()
  {
    return DEFAULT_URL;
  }

  @Override
  protected List<WebService<?>> fetchServices(URL url) throws IOException
  {
    PhmmerClient phmmerClient;
    try {
      phmmerClient = new PhmmerClient(url);
    }
    catch (URISyntaxException e) {
      throw new MalformedURLException(e.getMessage());
    }
    if (!phmmerClient.testEndpoint())
      throw new IOException(
              "unable to reach dispatcher server at " + url);
    var wsBuilder = WebService.<PhmmerAction> newBuilder();
    wsBuilder.url(url);
    wsBuilder.clientName("job dispatcher");
    wsBuilder.category("Database search");
    wsBuilder.name("pHMMER");
    wsBuilder.description("Hmmer3 phmmer is used to search one or more query sequences against a sequence database.");
    wsBuilder.interactive(false);
    wsBuilder.paramDatastore(ParamStores.newPhmmerDatastore(url, paramManager));
    wsBuilder.actionClass(PhmmerAction.class);
    var webService = wsBuilder.build(); 
    
    var client = new PhmmerWSClient(phmmerClient);
    var actionBuilder = PhmmerAction.newBuilder(client);
    actionBuilder.webService(webService);
    actionBuilder.name("");
    webService.addAction(actionBuilder.build());
    
    return List.of(webService);
  }

}