package jalview.ws2;

import java.net.URL;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CopyOnWriteArrayList;

public interface WebServiceDiscoverer
{
  public static final int STATUS_OK = 1;

  public static final int STATUS_NO_SERVICES = 0;

  public static final int STATUS_INVALID = -1;

  public static final int STATUS_UNKNOWN = -2;

  public List<String> getUrls();

  public void setUrls(List<String> wsUrls);

  public boolean testUrl(URL url);

  public int getStatusForUrl(String url);

  public List<WebServiceI> getServices();

  public boolean hasServices();

  public boolean isRunning();

  public boolean isDone();

  public CompletableFuture<WebServiceDiscoverer> startDiscoverer();

  public String getErrorMessages();

  @FunctionalInterface
  static interface ServiceChangeListener
  {
    public void servicesChanged(WebServiceDiscoverer discoverer,
            Collection<? extends WebServiceI> services);
  }

  List<ServiceChangeListener> serviceListeners = new CopyOnWriteArrayList<>();

  public default void addServiceChangeListener(
          ServiceChangeListener listener)
  {
    serviceListeners.add(listener);
  }

  public default void removeServiceChangeListener(
          ServiceChangeListener listener)
  {
    serviceListeners.remove(listener);
  }

  default void fireServicesChanged(List<WebServiceI> services)
  {
    for (var listener : serviceListeners)
    {
      listener.servicesChanged(this, services);
    }
  }
}