/**
 * 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 org.apache.heron.scheduler.kubernetes;

import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;

import org.apache.heron.scheduler.TopologyRuntimeManagementException;

import io.kubernetes.client.openapi.ApiClient;
import io.kubernetes.client.openapi.ApiException;
import io.kubernetes.client.openapi.Configuration;
import io.kubernetes.client.openapi.apis.CoreV1Api;

import okhttp3.Response;

public class KubernetesCompat {

  private static final Logger LOG = Logger.getLogger(KubernetesCompat.class.getName());

  boolean killTopology(String kubernetesUri, String topology, String namespace) {
    CoreV1Api coreClient;
    try {
      final ApiClient apiClient = io.kubernetes.client.util.Config.defaultClient();
      Configuration.setDefaultApiClient(apiClient);
      coreClient = new CoreV1Api(apiClient);
    } catch (IOException e) {
      LOG.log(Level.SEVERE, "Failed to setup Kubernetes client" + e);
      throw new RuntimeException(e);
    }

    // old version deployed topologies as naked pods
    try {
      final String labelSelector = KubernetesConstants.LABEL_TOPOLOGY + "=" + topology;
      final Response response =
          coreClient.deleteCollectionNamespacedPodCall(namespace, null, null, null, null, null,
          null, labelSelector, null, null,
          KubernetesConstants.DELETE_OPTIONS_PROPAGATION_POLICY,
          null, null, null, null, null).execute();

      if (response.isSuccessful()) {
        LOG.log(Level.INFO, "Pods for the Job [" + topology
            + "] in namespace [" + namespace + "] are deleted.");
        return true;
      } else {
        LOG.log(Level.SEVERE, "Error when deleting the Pods of the job ["
            + topology + "]: in namespace [" + namespace + "]");
        LOG.log(Level.SEVERE, "Error killing topology message: " + response.message());
        KubernetesUtils.logResponseBodyIfPresent(LOG, response);
        throw new TopologyRuntimeManagementException(
            KubernetesUtils.errorMessageFromResponse(response));
      }
    } catch (IOException | ApiException e) {
      LOG.log(Level.SEVERE, "Error killing topology " + e.getMessage());
      if (e instanceof ApiException) {
        LOG.log(Level.SEVERE, "Error details:\n" +  ((ApiException) e).getResponseBody());
      }
      return false;
    }
  }
}