package io.mifos.core.async.core;

import io.mifos.core.api.util.UserContextHolder;
import io.mifos.core.lang.TenantContextHolder;
import org.springframework.core.task.AsyncTaskExecutor;
import org.springframework.security.task.DelegatingSecurityContextAsyncTaskExecutor;

import java.util.concurrent.Callable;
import java.util.concurrent.Future;

public class DelegatingContextExecutor implements AsyncTaskExecutor {

  private final DelegatingSecurityContextAsyncTaskExecutor delegate;

  public DelegatingContextExecutor(final DelegatingSecurityContextAsyncTaskExecutor delegate) {
    super();
    this.delegate = delegate;
  }

  @Override
  public void execute(final Runnable task, final long startTimeout) {
    final Runnable taskWrapper = this.wrap(task);
    this.delegate.execute(taskWrapper, startTimeout);
  }

  @Override
  public Future<?> submit(final Runnable task) {
    final Runnable taskWrapper = this.wrap(task);
    return this.delegate.submit(taskWrapper);
  }

  @Override
  public <T> Future<T> submit(final Callable<T> task) {
    final Callable<T> taskWrapper = this.wrap(task);
    return this.delegate.submit(taskWrapper);
  }

  @Override
  public void execute(final Runnable task) {
    final Runnable taskWrapper = this.wrap(task);
    this.delegate.execute(taskWrapper);
  }

  private Runnable wrap(final Runnable task) {
    if(TenantContextHolder.identifier().isPresent()
        || UserContextHolder.getUserContext().isPresent()) {
      return new DelegatingContextRunnable(task, TenantContextHolder.checkedGetIdentifier(),
          UserContextHolder.getUserContext().get());
    }
    return new DelegatingContextRunnable(task);
  }

  private <T> Callable<T> wrap(final Callable<T> task) {
    if(TenantContextHolder.identifier().isPresent()
        || UserContextHolder.getUserContext().isPresent()) {
      return new DelegatingContextCallable<>(task, TenantContextHolder.checkedGetIdentifier(),
          UserContextHolder.getUserContext().get());
    }
    return new DelegatingContextCallable<>(task);
  }
}