package jalview.ws2.actions.alignment;

import java.util.List;
import java.util.Objects;

import jalview.viewmodel.AlignmentViewport;
import jalview.ws.params.ArgumentI;
import jalview.ws2.actions.BaseAction;
import jalview.ws2.actions.api.TaskEventListener;
import jalview.ws2.actions.api.TaskI;
import jalview.ws2.api.Credentials;
import jalview.ws2.client.api.AlignmentWebServiceClientI;

/**
 * Implementation of the {@link BaseAction} that runs alignment services. This
 * type of action requires {@link AlignmentWebServiceClientI} to retrieve
 * alignment result from the server.
 * 
 * @author mmwarowny
 *
 */
public class AlignmentAction extends BaseAction<AlignmentResult>
{
  /**
   * A builder for AlignemntActions. Adds {@code client} and {@code submitGaps}
   * parameters to the base builder.
   * 
   * @author mmwarowny
   */
  public static class Builder extends BaseAction.Builder<AlignmentAction>
  {
    protected AlignmentWebServiceClientI client;

    protected boolean submitGaps = false;

    public Builder(AlignmentWebServiceClientI client)
    {
      super();
      Objects.requireNonNull(client);
      this.client = client;
    }

    public void submitGaps(boolean val)
    {
      submitGaps = val;
    }

    public AlignmentAction build()
    {
      return new AlignmentAction(this);
    }
  }

  public static Builder newBuilder(AlignmentWebServiceClientI client)
  {
    return new Builder(client);
  }

  protected final boolean submitGaps;

  protected final AlignmentWebServiceClientI client;

  public AlignmentAction(Builder builder)
  {
    super(builder);
    submitGaps = builder.submitGaps;
    client = builder.client;
  }

  @Override
  public TaskI<AlignmentResult> perform(AlignmentViewport viewport,
      List<ArgumentI> args, Credentials credentials,
      TaskEventListener<AlignmentResult> handler)
  {
    var msa = viewport.getAlignmentView(true);
    var task = new AlignmentTask(
        client, this, args, credentials, msa, viewport, submitGaps, handler);
    task.start(viewport.getServiceExecutor());
    return task;
  }

  /**
   * Returns if the action is active for the given viewport. Alignment services
   * are non-interactive, so the action is never active.
   */
  @Override
  public boolean isActive(AlignmentViewport viewport)
  {
    return false;
  }

}