package jalview.rest;

import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import jalview.api.AlignmentViewPanel;
import jalview.bin.Console;
import jalview.datamodel.AlignmentI;
import jalview.datamodel.SequenceI;
import jalview.gui.AlignFrame;
import jalview.gui.Desktop;
import jalview.gui.SequenceFetcher;
import jalview.util.DBRefUtils;

public class FetchSequencesEndpoint extends AbstractEndpointAsync
{
  public FetchSequencesEndpoint(API api)
  {
    super(api, path, name, parameters, description);
  }

  private static final String path = "fetchsequences";

  private static final String name = "Fetch Sequences";

  private static final String parameters = "<resource name>/<sequence ids>";

  private static final String description = "Fetch sequences from online resource";

  private SequenceFetcher sf;

  @Override
  protected void initialise(HttpServletRequest request,
          HttpServletResponse response)
  {
    if (!checkParameters(request, response, 2))
    {
      return;
    }
    String[] parameters = getEndpointPathParameters(request);

    String dbName = parameters[0];
    String dbId = parameters[1];

    setId(request, dbName + "::" + dbId);
    saveParameters(request);

    if (checkStatus(request, response))
      return;

    String db = DBRefUtils.getCanonicalName(dbName);
    Desktop desktop = Desktop.instance;
    sf = new SequenceFetcher(desktop, db, dbId, false);
    setCompletableFuture(sf.ok_actionPerformed(true, getId()));
  }

  protected void processAsync(HttpServletRequest request,
          HttpServletResponse response, Map<String, Object> map)
  {
    // all the work being done by the SequenceFetcher!
    Console.warn("THIS SHOULD NOT BE RUN");
  }

  @Override
  protected void atEnd()
  {
    sf.close_actionPerformed(null);
  }

  @Override
  protected String finishedResponseString(HttpServletRequest request,
          HttpServletResponse response)
  {
    AlignFrame af = getAlignFrameUsingId(request);
    if (af == null)
      return null;
    List<AlignmentViewPanel> aps = (List<AlignmentViewPanel>) af
            .getAlignPanels();
    StringBuilder sb = new StringBuilder();
    for (AlignmentViewPanel ap : aps)
    {
      AlignmentI al = ap.getAlignment();
      if (al == null)
        continue;
      List<SequenceI> seqs = (List<SequenceI>) al.getSequences();
      for (SequenceI seq : seqs)
      {
        if (sb.length() > 0)
          sb.append(",");
        sb.append(seq.getName());
        seq.setStart(1000);
      }
    }
    sb.insert(0, "sequences=");
    sb.append("\n");
    return sb.toString();
  }

}