/*
 * Copyright 2014 Fluo authors (see AUTHORS)
 *
 * 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.
 */

package io.fluo.stress.trie;

import java.io.File;
import java.io.IOException;

import org.apache.fluo.api.client.Loader;
import org.apache.fluo.api.config.FluoConfiguration;
import org.apache.fluo.mapreduce.FluoOutputFormat;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.lib.input.SequenceFileInputFormat;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class Load extends Configured implements Tool {

  private static final Logger log = LoggerFactory.getLogger(Load.class);

  public static class LoadMapper extends Mapper<LongWritable, NullWritable, Loader, NullWritable> {

    @Override
    protected void map(LongWritable key, NullWritable val, Context context)
        throws IOException, InterruptedException {
      context.write(new NumberLoader(key.get()), val);
    }
  }

  @Override
  public int run(String[] args) throws Exception {

    if (args.length != 2) {
      log.error("Usage: " + this.getClass().getSimpleName() + "<fluoProps> <input dir>");
      System.exit(-1);
    }

    FluoConfiguration props = new FluoConfiguration(new File(args[0]));
    Path input = new Path(args[1]);

    Job job = Job.getInstance(getConf());

    job.setJobName(Load.class.getName());

    job.setJarByClass(Load.class);

    job.setInputFormatClass(SequenceFileInputFormat.class);
    SequenceFileInputFormat.addInputPath(job, input);

    job.setMapperClass(LoadMapper.class);

    job.setNumReduceTasks(0);

    job.setOutputFormatClass(FluoOutputFormat.class);
    FluoOutputFormat.configure(job, props);

    job.getConfiguration().setBoolean("mapreduce.map.speculative", false);

    boolean success = job.waitForCompletion(true);
    return success ? 0 : 1;
  }

  public static void main(String[] args) throws Exception {
    int ret = ToolRunner.run(new Load(), args);
    System.exit(ret);
  }

}