/*
 * 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.accumulo.testing.core.randomwalk.multitable;

import java.io.IOException;

import org.apache.accumulo.core.client.Accumulo;
import org.apache.accumulo.core.client.ClientInfo;
import org.apache.accumulo.core.client.mapreduce.AccumuloInputFormat;
import org.apache.accumulo.core.client.mapreduce.AccumuloOutputFormat;
import org.apache.accumulo.core.data.Key;
import org.apache.accumulo.core.data.Mutation;
import org.apache.accumulo.core.data.Value;
import org.apache.accumulo.core.security.Authorizations;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.util.Tool;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class CopyTool extends Configured implements Tool {
  protected final Logger log = LoggerFactory.getLogger(this.getClass());

  public static class SeqMapClass extends Mapper<Key,Value,Text,Mutation> {
    @Override
    public void map(Key key, Value val, Context output) throws IOException, InterruptedException {
      Mutation m = new Mutation(key.getRow());
      m.put(key.getColumnFamily(), key.getColumnQualifier(), val);
      output.write(null, m);
    }
  }

  @Override
  public int run(String[] args) throws Exception {
    Job job = Job.getInstance(getConf(), this.getClass().getSimpleName());
    job.setJarByClass(this.getClass());

    if (job.getJar() == null) {
      log.error("M/R requires a jar file!  Run mvn package.");
      return 1;
    }

    ClientInfo info = Accumulo.newClient().from(args[0]).info();
    job.setInputFormatClass(AccumuloInputFormat.class);
    AccumuloInputFormat.setClientInfo(job, info);
    AccumuloInputFormat.setInputTableName(job, args[1]);
    AccumuloInputFormat.setScanAuthorizations(job, Authorizations.EMPTY);

    job.setMapperClass(SeqMapClass.class);
    job.setMapOutputKeyClass(Text.class);
    job.setMapOutputValueClass(Mutation.class);
    job.setNumReduceTasks(0);

    job.setOutputFormatClass(AccumuloOutputFormat.class);
    AccumuloOutputFormat.setClientInfo(job, info);
    AccumuloOutputFormat.setCreateTables(job, true);
    AccumuloOutputFormat.setDefaultTableName(job, args[2]);

    job.waitForCompletion(true);
    return job.isSuccessful() ? 0 : 1;
  }
}