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package parquet.hive.internal;


import java.io.IOException;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Map.Entry;

import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.ql.exec.Operator;
import org.apache.hadoop.hive.ql.exec.TableScanOperator;
import org.apache.hadoop.hive.ql.exec.Utilities;
import org.apache.hadoop.hive.ql.plan.ExprNodeDesc;
import org.apache.hadoop.hive.ql.plan.MapWork;
import org.apache.hadoop.hive.ql.plan.PartitionDesc;
import org.apache.hadoop.hive.ql.plan.TableScanDesc;
import org.apache.hadoop.hive.serde2.ColumnProjectionUtils;
import org.apache.hadoop.mapred.JobConf;

import parquet.Log;

/**
 * Hive 0.12 implementation of {@link parquet.hive.HiveBinding HiveBinding}.
 * This class is a copied and slightly modified version of
 * ManageJobConfig class.
 */
public class Hive012Binding extends AbstractHiveBinding {
  private static final Log LOG = Log.getLog(Hive012Binding.class);
  private final Map pathToPartitionInfo =
      new LinkedHashMap();
  /**
   * MapWork is the Hive object which describes input files,
   * columns projections, and filters.
   */
  private MapWork mapWork;


  /**
   * Initialize the mapWork variable in order to get all the partition and start to update the jobconf
   *
   * @param job
   */
  private void init(final JobConf job) {
    final String plan = HiveConf.getVar(job, HiveConf.ConfVars.PLAN);
    if (mapWork == null && plan != null && plan.length() > 0) {
      mapWork = Utilities.getMapWork(job);
      pathToPartitionInfo.clear();
      for (final Map.Entry entry : mapWork.getPathToPartitionInfo().entrySet()) {
        pathToPartitionInfo.put(new Path(entry.getKey()).toUri().getPath().toString(), entry.getValue());
      }
    }
  }

  private void pushProjectionsAndFilters(final JobConf jobConf,
      final String splitPath, final String splitPathWithNoSchema) {

    if (mapWork == null) {
      LOG.debug("Not pushing projections and filters because MapWork is null");
      return;
    } else if (mapWork.getPathToAliases() == null) {
      LOG.debug("Not pushing projections and filters because pathToAliases is null");
      return;
    }

    final ArrayList aliases = new ArrayList();
    final Iterator>> iterator = mapWork.getPathToAliases().entrySet().iterator();

    while (iterator.hasNext()) {
      final Entry> entry = iterator.next();
      final String key = new Path(entry.getKey()).toUri().getPath();

      if (splitPath.equals(key) || splitPathWithNoSchema.equals(key)) {
        final ArrayList list = entry.getValue();
        for (final String val : list) {
          aliases.add(val);
        }
      }
    }

    for (final String alias : aliases) {
      final Operator op = mapWork.getAliasToWork().get(
              alias);
      if (op != null && op instanceof TableScanOperator) {
        final TableScanOperator tableScan = (TableScanOperator) op;

        // push down projections
        final ArrayList list = tableScan.getNeededColumnIDs();

        if (list != null) {
          ColumnProjectionUtils.appendReadColumnIDs(jobConf, list);
        } else {
          ColumnProjectionUtils.setFullyReadColumns(jobConf);
        }

        pushFilters(jobConf, tableScan);
      }
    }
  }

  private void pushFilters(final JobConf jobConf, final TableScanOperator tableScan) {

    final TableScanDesc scanDesc = tableScan.getConf();
    if (scanDesc == null) {
      LOG.debug("Not pushing filters because TableScanDesc is null");
      return;
    }

    // construct column name list for reference by filter push down
    Utilities.setColumnNameList(jobConf, tableScan);

    // push down filters
    final ExprNodeDesc filterExpr = scanDesc.getFilterExpr();
    if (filterExpr == null) {
      LOG.debug("Not pushing filters because FilterExpr is null");
      return;
    }

    final String filterText = filterExpr.getExprString();
    final String filterExprSerialized = Utilities.serializeExpression(filterExpr);
    jobConf.set(
            TableScanDesc.FILTER_TEXT_CONF_STR,
            filterText);
    jobConf.set(
            TableScanDesc.FILTER_EXPR_CONF_STR,
            filterExprSerialized);
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public JobConf pushProjectionsAndFilters(JobConf jobConf, Path path)
      throws IOException {
    init(jobConf);
    final JobConf cloneJobConf = new JobConf(jobConf);
    final PartitionDesc part = pathToPartitionInfo.get(path.toString());

    if ((part != null) && (part.getTableDesc() != null)) {
      Utilities.copyTableJobPropertiesToConf(part.getTableDesc(), cloneJobConf);
    }

    pushProjectionsAndFilters(cloneJobConf, path.toString(), path.toUri().toString());
    return cloneJobConf;
  }
}