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/*
 * Copyright (c) 2014 Spotify AB.
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package com.spotify.helios.testing;

import com.google.common.util.concurrent.ListenableFuture;

import com.spotify.helios.client.HeliosClient;
import com.spotify.helios.common.descriptors.Job;
import com.spotify.helios.common.descriptors.JobId;
import com.spotify.helios.common.protocol.JobDeleteResponse;
import com.spotify.helios.common.protocol.JobUndeployResponse;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.List;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

import static java.lang.String.format;
import static java.util.concurrent.TimeUnit.MILLISECONDS;

class Jobs {

  private static final Logger log = LoggerFactory.getLogger(Jobs.class);

  static final long TIMEOUT_MILLIS = TimeUnit.MINUTES.toMillis(5);

  static  T get(final ListenableFuture future)
      throws InterruptedException, ExecutionException, TimeoutException {
    return get(future, TIMEOUT_MILLIS);
  }

  static  T get(final ListenableFuture future, final long timeout)
      throws InterruptedException, ExecutionException, TimeoutException {
    return future.get(timeout, MILLISECONDS);
  }

  static String getJobDescription(final Job job) {
    final String shortHash = job.getId().getHash().substring(0, 7);
    return String.format("%s (Job %s)", job.getImage(), shortHash);
  }

  /**
   * Undeploy the job from all specified hosts, and delete the job. Any failures will be ignored,
   * and we will keep trying each host. A list of errors encountered along the way will be returned
   * to the caller.
   * @param client the HeliosClient to use
   * @param job the job to undeploy and delete
   * @param hosts the hosts to undeploy from
   * @param errors errors encountered during the undeploy will be added to this list
   * @return the list of errors
   */
  static List undeploy(final HeliosClient client, final Job job,
                                              final List hosts,
                                              final List errors) {
    final JobId id = job.getId();
    for (String host : hosts) {
      log.info("Undeploying {} from {}", getJobDescription(job), host);
      final JobUndeployResponse response;
      try {
        response = get(client.undeploy(id, host));
        if (response.getStatus() != JobUndeployResponse.Status.OK &&
            response.getStatus() != JobUndeployResponse.Status.JOB_NOT_FOUND) {
          errors.add(new AssertionError(format("Failed to undeploy job %s - %s",
                                               id, response)));
        }
      } catch (InterruptedException | ExecutionException | TimeoutException e) {
        errors.add(new AssertionError(e));
      }
    }

    try {
      log.debug("Deleting job {}", id);
      final JobDeleteResponse response = get(client.deleteJob(id));
      if (response.getStatus() != JobDeleteResponse.Status.OK &&
          response.getStatus() != JobDeleteResponse.Status.JOB_NOT_FOUND) {
        errors.add(new AssertionError(format("Failed to delete job %s - %s",
                                             id.toString(), response.toString())));
      }
    } catch (InterruptedException | ExecutionException | TimeoutException e) {
      errors.add(new AssertionError(e));
    }

    return errors;
  }

}