/*
 * 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.samza.config;

import java.util.Optional;


public class ShellCommandConfig extends MapConfig {
  /**
   * This environment variable is used to store a JSON serialized map of all coordinator system configs.
   */
  public static final String ENV_COORDINATOR_SYSTEM_CONFIG = "SAMZA_COORDINATOR_SYSTEM_CONFIG";

  /**
   * This environment variable is used to pass a JSON serialized map of configs provided during job submission.
   */
  public static final String ENV_SUBMISSION_CONFIG = "SAMZA_SUBMISSION_CONFIG";

  /**
   * The ID for a container. This is a string representation that is unique to the runtime environment.
   */
  public static final String ENV_CONTAINER_ID = "SAMZA_CONTAINER_ID";

  /**
   * The URL location of the job coordinator's HTTP server.
   */
  public static final String ENV_COORDINATOR_URL = "SAMZA_COORDINATOR_URL";

  /**
   * Arguments to be passed to the processing running the TaskRunner (or equivalent, for non JVM languages).
   */
  public static final String ENV_JAVA_OPTS = "JAVA_OPTS";

  /**
   * The JAVA_HOME path for running the task
   */
  public static final String ENV_JAVA_HOME = "JAVA_HOME";

  /**
   * The ID assigned to the container by the execution environment (eg: YARN Container Id)
   */
  public static final String ENV_EXECUTION_ENV_CONTAINER_ID = "EXECUTION_ENV_CONTAINER_ID";

  /**
   * Set to "true" if split deployment feature is enabled. Otherwise, will be considered false.
   *
   * The launch process for the cluster-based job coordinator and job container depends on the value of this, since it
   * needs to be known if the cluster-based job coordinator and job container should be launched in a split deployment
   * mode.
   * This needs to be an environment variable, because the value needs to be known before the full configs can be read
   * from the metadata store (full configs are only read after launch is complete).
   */
  public static final String ENV_SPLIT_DEPLOYMENT_ENABLED = "ENV_SPLIT_DEPLOYMENT_ENABLED";

  /**
   * When running the cluster-based job coordinator and job container in a split deployment mode, it uses JARs and
   * resources from a lib directory which is provided by the framework. In some cases, it is necessary to use some
   * resources specified by the application as well. This environment variable can be set to a directory which is
   * different from the framework lib directory in order to tell Samza where application resources live.
   * This is an environment variable because it is needed in order to launch the cluster-based job coordinator and job
   * container Java processes, which means access to full configs is not available yet.
   * For example, this is used to set a system property for the location of an application-specified log4j configuration
   * file when launching the cluster-based job coordinator and job container Java processes.
   */
  public static final String ENV_APPLICATION_LIB_DIR = "APPLICATION_LIB_DIR";

  /*
   * The base directory for storing logged data stores used in Samza. This has to be set on all machine running Samza
   * containers. For example, when using YARN, it has to be set in all NMs and passed to the containers.
   * If this environment variable is not set, the path defaults to current working directory (which is the same as the
   * path for persisting non-logged data stores)
   */
  public static final String ENV_LOGGED_STORE_BASE_DIR = "LOGGED_STORE_BASE_DIR";

  /**
   * The directory path that contains the execution plan
   */
  public static final String EXECUTION_PLAN_DIR = "EXECUTION_PLAN_DIR";

  /**
   * Points to the lib directory of the localized resources(other than the framework dependencies).
   */
  public static final String ENV_ADDITIONAL_CLASSPATH_DIR = "ADDITIONAL_CLASSPATH_DIR";

  public static final String COMMAND_SHELL_EXECUTE = "task.execute";
  public static final String TASK_JVM_OPTS = "task.opts";
  public static final String TASK_JAVA_HOME = "task.java.home";

  /**
   * SamzaContainer uses JARs from the lib directory of the framework in it classpath. In some cases, it is necessary to include
   * the jars from lib directories of the resources that are localized along with the framework dependencies. These resources are logically
   * independent of the framework and cannot be bundled with the framework dependencies. The URI of these resources are set dynamically at
   * run-time before launching the SamzaContainer. This environment variable can be set to a lib directory of the localized resource and
   * it will be included in the java classpath of the SamzaContainer.
   */
  public static final String ADDITIONAL_CLASSPATH_DIR = "additional.classpath.dir";

  public ShellCommandConfig(Config config) {
    super(config);
  }

  public String getCommand() {
    return Optional.ofNullable(get(ShellCommandConfig.COMMAND_SHELL_EXECUTE)).orElse("bin/run-container.sh");
  }

  public Optional<String> getTaskOpts() {
    Optional<String> jvmOpts = Optional.ofNullable(get(ShellCommandConfig.TASK_JVM_OPTS));
    Optional<String> maxHeapMbOptional = Optional.ofNullable(get(JobConfig.JOB_AUTOSIZING_CONTAINER_MAX_HEAP_MB));
    if (new JobConfig(this).getAutosizingEnabled() && maxHeapMbOptional.isPresent()) {
      String maxHeapMb = maxHeapMbOptional.get();
      String xmxSetting = "-Xmx" + maxHeapMb + "m";
      if (jvmOpts.isPresent() && jvmOpts.get().contains("-Xmx")) {
        jvmOpts = Optional.of(jvmOpts.get().replaceAll("-Xmx\\S+", xmxSetting));
      } else if (jvmOpts.isPresent()) {
        jvmOpts = Optional.of(jvmOpts.get().concat(" " + xmxSetting));
      } else {
        jvmOpts = Optional.of(xmxSetting);
      }
    }
    return jvmOpts;
  }

  public Optional<String> getJavaHome() {
    return Optional.ofNullable(get(ShellCommandConfig.TASK_JAVA_HOME));
  }

  public Optional<String> getAdditionalClasspathDir() {
    return Optional.ofNullable(get(ShellCommandConfig.ADDITIONAL_CLASSPATH_DIR));
  }
}