package com.yahoo.labs.samoa.topology.impl;

/*
 * #%L
 * SAMOA
 * %%
 * Copyright (C) 2014 - 2015 Apache Software Foundation
 * %%
 * Licensed 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.
 * #L%
 */

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

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

import backtype.storm.Config;
import backtype.storm.utils.Utils;

/**
 * The main class that used by samoa script to execute SAMOA task.
 * 
 * @author Arinto Murdopo
 * 
 */
public class StormDoTask {
  private static final Logger logger = LoggerFactory.getLogger(StormDoTask.class);
  private static String localFlag = "local";
  private static String clusterFlag = "cluster";

  /**
   * The main method.
   * 
   * @param args
   *          the arguments
   */
  public static void main(String[] args) {

    List<String> tmpArgs = new ArrayList<String>(Arrays.asList(args));

    boolean isLocal = isLocal(tmpArgs);
    int numWorker = StormSamoaUtils.numWorkers(tmpArgs);

    args = tmpArgs.toArray(new String[0]);

    // convert the arguments into Storm topology
    StormTopology stormTopo = StormSamoaUtils.argsToTopology(args);
    String topologyName = stormTopo.getTopologyName();

    Config conf = new Config();
    conf.putAll(Utils.readStormConfig());
    conf.setDebug(false);

    if (isLocal) {
      // local mode
      conf.setMaxTaskParallelism(numWorker);

      backtype.storm.LocalCluster cluster = new backtype.storm.LocalCluster();
      cluster.submitTopology(topologyName, conf, stormTopo.getStormBuilder().createTopology());

      backtype.storm.utils.Utils.sleep(600 * 1000);

      cluster.killTopology(topologyName);
      cluster.shutdown();

    } else {
      // cluster mode
      conf.setNumWorkers(numWorker);
      try {
        backtype.storm.StormSubmitter.submitTopology(topologyName, conf,
            stormTopo.getStormBuilder().createTopology());
      } catch (backtype.storm.generated.AlreadyAliveException ale) {
        ale.printStackTrace();
      } catch (backtype.storm.generated.InvalidTopologyException ite) {
        ite.printStackTrace();
      }
    }
  }

  private static boolean isLocal(List<String> tmpArgs) {
    ExecutionMode executionMode = ExecutionMode.UNDETERMINED;

    int position = tmpArgs.size() - 1;
    String flag = tmpArgs.get(position);
    boolean isLocal = true;

    if (flag.equals(clusterFlag)) {
      executionMode = ExecutionMode.CLUSTER;
      isLocal = false;
    } else if (flag.equals(localFlag)) {
      executionMode = ExecutionMode.LOCAL;
      isLocal = true;
    }

    if (executionMode != ExecutionMode.UNDETERMINED) {
      tmpArgs.remove(position);
    }

    return isLocal;
  }

  private enum ExecutionMode {
    LOCAL, CLUSTER, UNDETERMINED
  };
}