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package ratpack.rx2.internal;

import io.reactivex.Observer;
import io.reactivex.disposables.Disposable;
import io.reactivex.exceptions.CompositeException;
import io.reactivex.exceptions.OnErrorNotImplementedException;
import io.reactivex.exceptions.UndeliverableException;
import ratpack.exec.Promise;
import ratpack.func.Action;

public  class ExecutionBackedObserver implements Observer {
  private final Observer observer;

  public ExecutionBackedObserver(Observer observer) {
    this.observer = observer;
  }

  @Override
  public void onComplete() {
    try {
      observer.onComplete();
    } catch (final OnErrorNotImplementedException e) {
      Promise.error(e.getCause()).then(Action.noop());
    } catch (Exception e) {
      Promise.error(new UndeliverableException(e)).then(Action.noop());
    }
  }

  @Override
  public void onError(Throwable e) {
    try {
      observer.onError(e);
    } catch (final OnErrorNotImplementedException e2) {
      Promise.error(e2.getCause()).then(Action.noop());
    } catch (Exception e2) {
      Promise.error(new CompositeException(e, e2)).then(Action.noop());
    }
  }

  @Override
  public void onSubscribe(Disposable d) {
    try {
      observer.onSubscribe(d);
    } catch (final OnErrorNotImplementedException e) {
      Promise.error(e.getCause()).then(Action.noop());
    } catch (Exception e) {
      Promise.error(new UndeliverableException(e)).then(Action.noop());
    }
  }

  @Override
  public void onNext(T t) {
    try {
      observer.onNext(t);
    } catch (final OnErrorNotImplementedException e) {
      Promise.error(e.getCause()).then(Action.noop());
    } catch (Exception e) {
      Promise.error(new UndeliverableException(e)).then(Action.noop());
    }
  }

}