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/**
 * 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.hcatalog.mapreduce;

import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hive.metastore.Warehouse;
import org.apache.hadoop.hive.metastore.api.MetaException;
import org.apache.hadoop.hive.metastore.api.Partition;
import org.apache.hadoop.hive.metastore.api.StorageDescriptor;
import org.apache.hadoop.hive.metastore.api.Table;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.ql.parse.EximUtil;
import org.apache.hadoop.hive.ql.parse.SemanticException;
import org.apache.hadoop.mapreduce.JobContext;
import org.apache.hadoop.mapreduce.JobStatus;
import org.apache.hadoop.mapreduce.OutputCommitter;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import org.apache.hcatalog.common.ErrorType;
import org.apache.hcatalog.common.HCatException;

public class HCatEximOutputCommitter extends OutputCommitter {

  private static final Log LOG = LogFactory.getLog(HCatEximOutputCommitter.class);

  private final OutputCommitter baseCommitter;

  public HCatEximOutputCommitter(JobContext context, OutputCommitter baseCommitter) {
    this.baseCommitter = baseCommitter;
  }

  @Override
  public void abortTask(TaskAttemptContext context) throws IOException {
      baseCommitter.abortTask(context);
  }

  @Override
  public void commitTask(TaskAttemptContext context) throws IOException {
      baseCommitter.commitTask(context);
  }

  @Override
  public boolean needsTaskCommit(TaskAttemptContext context) throws IOException {
      return baseCommitter.needsTaskCommit(context);
  }

  @Override
  public void setupJob(JobContext context) throws IOException {
    if( baseCommitter != null ) {
      baseCommitter.setupJob(context);
    }
  }

  @Override
  public void setupTask(TaskAttemptContext context) throws IOException {
      baseCommitter.setupTask(context);
  }

  @Override
  public void abortJob(JobContext jobContext, JobStatus.State state) throws IOException {
    if(baseCommitter != null) {
      baseCommitter.abortJob(jobContext, state);
    }
    OutputJobInfo jobInfo = HCatOutputFormat.getJobInfo(jobContext);

    Path src = new Path(jobInfo.getLocation());
    FileSystem fs = src.getFileSystem(jobContext.getConfiguration());
    fs.delete(src, true);
  }

  @Override
  public void commitJob(JobContext jobContext) throws IOException {
    if(baseCommitter != null) {
      baseCommitter.commitJob(jobContext);
    }
  }

  @Override
  public void cleanupJob(JobContext jobContext) throws IOException {
    LOG.info("HCatEximOutputCommitter.cleanup invoked; m.o.d : " +
        jobContext.getConfiguration().get("mapred.output.dir"));
    if (baseCommitter != null) {
      LOG.info("baseCommitter.class = " + baseCommitter.getClass().getName());
      baseCommitter.cleanupJob(jobContext);
    }

    OutputJobInfo jobInfo = HCatBaseOutputFormat.getJobInfo(jobContext);
    Configuration conf = jobContext.getConfiguration();
    FileSystem fs;
    try {
      fs = FileSystem.get(new URI(jobInfo.getTableInfo().getTable().getSd().getLocation()), conf);
    } catch (URISyntaxException e) {
      throw new IOException(e);
    }
    doCleanup(jobInfo, fs);
  }

  private static void doCleanup(OutputJobInfo jobInfo, FileSystem fs) throws IOException,
      HCatException {
    try {
      Table ttable = jobInfo.getTableInfo().getTable();
      org.apache.hadoop.hive.ql.metadata.Table table = new org.apache.hadoop.hive.ql.metadata.Table(
          ttable);
      StorageDescriptor tblSD = ttable.getSd();
      Path tblPath = new Path(tblSD.getLocation());
      Path path = new Path(tblPath, "_metadata");
      List tpartitions = null;
      try {
        Map.Entry> rv = EximUtil
            .readMetaData(fs, path);
        tpartitions = rv.getValue();
      } catch (IOException e) {
      }
      List partitions =
        new ArrayList();
      if (tpartitions != null) {
        for (Partition tpartition : tpartitions) {
          partitions.add(new org.apache.hadoop.hive.ql.metadata.Partition(table, tpartition));
        }
      }
      if (!table.getPartitionKeys().isEmpty()) {
        Map partitionValues = jobInfo.getPartitionValues();
        org.apache.hadoop.hive.ql.metadata.Partition partition =
            new org.apache.hadoop.hive.ql.metadata.Partition(table,
                partitionValues,
                new Path(tblPath, Warehouse.makePartPath(partitionValues)));
        partition.getTPartition().setParameters(table.getParameters());
        partitions.add(partition);
      }
      EximUtil.createExportDump(fs, path, (table), partitions);
    } catch (SemanticException e) {
      throw new HCatException(ErrorType.ERROR_PUBLISHING_PARTITION, e);
    } catch (HiveException e) {
      throw new HCatException(ErrorType.ERROR_PUBLISHING_PARTITION, e);
    } catch (MetaException e) {
      throw new HCatException(ErrorType.ERROR_PUBLISHING_PARTITION, e);
    }
  }
}