/*
 * 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.reef.bridge.driver.launch.yarn;

import org.apache.commons.lang.StringUtils;
import org.apache.reef.bridge.driver.launch.IDriverLauncher;
import org.apache.reef.bridge.driver.service.IDriverServiceConfigurationProvider;
import org.apache.reef.bridge.driver.service.grpc.GRPCDriverServiceConfigurationProvider;
import org.apache.reef.bridge.proto.ClientProtocol;
import org.apache.reef.client.DriverLauncher;
import org.apache.reef.client.LauncherStatus;
import org.apache.reef.runtime.yarn.client.YarnClientConfiguration;
import org.apache.reef.runtime.yarn.driver.parameters.FileSystemUrl;
import org.apache.reef.tang.Configuration;
import org.apache.reef.tang.Configurations;
import org.apache.reef.tang.JavaConfigurationBuilder;
import org.apache.reef.tang.Tang;
import org.apache.reef.tang.exceptions.InjectionException;

import javax.inject.Inject;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * This is a bootstrap launcher for YARN for submission from the bridge. It allows for Java Driver
 * configuration generation directly on the Driver without need of Java dependency if REST
 * submission is used.
 */
public final class YarnLauncher implements IDriverLauncher {
  private static final Logger LOG = Logger.getLogger(YarnLauncher.class.getName());

  @Inject
  private YarnLauncher(){
  }

  public LauncherStatus launch(final ClientProtocol.DriverClientConfiguration driverClientConfiguration) {
    try {
      try {
        final IDriverServiceConfigurationProvider driverConfigurationProvider =
            Tang.Factory.getTang().newInjector(Tang.Factory.getTang().newConfigurationBuilder()
                .bindImplementation(IDriverServiceConfigurationProvider.class,
                    GRPCDriverServiceConfigurationProvider.class)
                .build()
            ).getInstance(IDriverServiceConfigurationProvider.class);
        Configuration yarnConfiguration = YarnClientConfiguration.CONF
            .set(YarnClientConfiguration.UNMANAGED_DRIVER,
                driverClientConfiguration.getYarnRuntime().getUnmangedDriver())
            .set(YarnClientConfiguration.YARN_PRIORITY, driverClientConfiguration.getYarnRuntime().getPriority())
            .set(YarnClientConfiguration.JVM_HEAP_SLACK, 0.0)
            .build();
        if (StringUtils.isNotEmpty(driverClientConfiguration.getYarnRuntime().getFilesystemUrl())) {
          final JavaConfigurationBuilder providerConfig = Tang.Factory.getTang().newConfigurationBuilder()
              .bindNamedParameter(FileSystemUrl.class, driverClientConfiguration.getYarnRuntime().getFilesystemUrl());
          yarnConfiguration = Configurations.merge(yarnConfiguration, providerConfig.build());
        }
        final LauncherStatus status = DriverLauncher.getLauncher(yarnConfiguration)
            .run(driverConfigurationProvider.getDriverServiceConfiguration(driverClientConfiguration));
        LOG.log(Level.INFO, "Job complete status: " + status.toString());
        if (status.getError().isPresent()) {
          LOG.log(Level.SEVERE, status.getError().get().getMessage());
          status.getError().get().printStackTrace();
        }
        return status;
      } catch (InjectionException e) {
        throw new RuntimeException(e);
      }

    } catch (final Exception e) {
      throw fatal("Failed to initialize configurations.", e);
    }
  }

  private static RuntimeException fatal(final String msg, final Throwable t) {
    LOG.log(Level.SEVERE, msg, t);
    return new RuntimeException(msg, t);
  }
}