/**
 * 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.common.basics.ByteAmount;
import org.apache.heron.common.basics.SysUtils;
import org.apache.heron.scheduler.utils.Runtime;
import org.apache.heron.spi.common.Config;
import org.apache.heron.spi.common.Context;

import io.kubernetes.client.openapi.ApiException;

import okhttp3.Response;

final class KubernetesUtils {

  private static final String CONTAINER = "kubernetes";

  private KubernetesUtils() {
  }

  static String getConfCommand(Config config) {
    return String.format("%s %s", Context.downloaderConf(config), CONTAINER);
  }

  static String getFetchCommand(Config config, Config runtime) {
    return String.format("%s %s .", Context.downloaderBinary(config),
        Runtime.topologyPackageUri(runtime).toString());
  }

  static void logResponseBodyIfPresent(Logger log, Response response) {
    try {
      log.log(Level.SEVERE, "Error details:\n" +  response.body().string());
    } catch (IOException ioe) {
      // ignore
      SysUtils.closeIgnoringExceptions(response.body());
    }
  }

  static void logExceptionWithDetails(Logger log, String message, Exception e) {
    log.log(Level.SEVERE, message + " " + e.getMessage());
    if (e instanceof ApiException) {
      log.log(Level.SEVERE, "Error details:\n" +  ((ApiException) e).getResponseBody());
    }
  }

  static String errorMessageFromResponse(Response response) {
    final String message = response.message();
    String details;
    try {
      details = response.body().string();
    } catch (IOException ioe) {
      // ignore
      details = ioe.getMessage();
    } finally {
      SysUtils.closeIgnoringExceptions(response.body());
    }
    return message + "\ndetails:\n" + details;
  }

  // https://kubernetes.io/docs/concepts/configuration/manage-compute-resources-container/
  // #meaning-of-memory
  static String Megabytes(ByteAmount amount) {
    return String.format("%sMi", Long.toString(amount.asMegabytes()));
  }
}