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/*
 * Druid - a distributed column store.
 * Copyright (C) 2012, 2013  Metamarkets Group Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

package io.druid.segment.realtime;

import com.google.common.base.Preconditions;
import com.google.common.base.Throwables;
import com.google.common.collect.Maps;
import com.google.common.io.Closeables;
import com.google.inject.Inject;
import com.metamx.common.exception.FormattedException;
import com.metamx.common.lifecycle.LifecycleStart;
import com.metamx.common.lifecycle.LifecycleStop;
import com.metamx.emitter.EmittingLogger;
import io.druid.data.input.Firehose;
import io.druid.data.input.InputRow;
import io.druid.query.DataSource;
import io.druid.query.FinalizeResultsQueryRunner;
import io.druid.query.NoopQueryRunner;
import io.druid.query.Query;
import io.druid.query.QueryRunner;
import io.druid.query.QueryRunnerFactory;
import io.druid.query.QueryRunnerFactoryConglomerate;
import io.druid.query.QuerySegmentWalker;
import io.druid.query.QueryToolChest;
import io.druid.query.SegmentDescriptor;
import io.druid.query.TableDataSource;
import io.druid.segment.realtime.plumber.Plumber;
import io.druid.segment.realtime.plumber.Sink;
import org.joda.time.DateTime;
import org.joda.time.Interval;
import org.joda.time.Period;

import java.io.Closeable;
import java.io.IOException;
import java.util.List;
import java.util.Map;

/**
 */
public class RealtimeManager implements QuerySegmentWalker
{
  private static final EmittingLogger log = new EmittingLogger(RealtimeManager.class);

  private final List fireDepartments;
  private final QueryRunnerFactoryConglomerate conglomerate;

  private final Map chiefs;

  @Inject
  public RealtimeManager(
      List fireDepartments,
      QueryRunnerFactoryConglomerate conglomerate
  )
  {
    this.fireDepartments = fireDepartments;
    this.conglomerate = conglomerate;

    this.chiefs = Maps.newHashMap();
  }

  @LifecycleStart
  public void start() throws IOException
  {
    for (final FireDepartment fireDepartment : fireDepartments) {
      Schema schema = fireDepartment.getSchema();

      final FireChief chief = new FireChief(fireDepartment);
      chiefs.put(schema.getDataSource(), chief);

      chief.setName(String.format("chief-%s", schema.getDataSource()));
      chief.setDaemon(true);
      chief.init();
      chief.start();
    }
  }

  @LifecycleStop
  public void stop()
  {
    for (FireChief chief : chiefs.values()) {
      Closeables.closeQuietly(chief);
    }
  }

  public FireDepartmentMetrics getMetrics(String datasource)
  {
    FireChief chief = chiefs.get(datasource);
    if (chief == null) {
      return null;
    }
    return chief.getMetrics();
  }

  @Override
  public  QueryRunner getQueryRunnerForIntervals(Query query, Iterable intervals)
  {
    final FireChief chief = chiefs.get(getDataSourceName(query));

    return chief == null ? new NoopQueryRunner() : chief.getQueryRunner(query);
  }

  @Override
  public  QueryRunner getQueryRunnerForSegments(Query query, Iterable specs)
  {
    final FireChief chief = chiefs.get(getDataSourceName(query));

    return chief == null ? new NoopQueryRunner() : chief.getQueryRunner(query);
  }

  private  String getDataSourceName(Query query)
  {
    DataSource dataSource = query.getDataSource();
    if (!(dataSource instanceof TableDataSource)) {
      throw new UnsupportedOperationException("data source type '" + dataSource.getClass().getName() + "' unsupported");
    }

    String dataSourceName;
    try {
      dataSourceName = ((TableDataSource) query.getDataSource()).getName();
    } catch (ClassCastException e) {
      throw new UnsupportedOperationException("Subqueries are only supported in the broker");
    }
    return dataSourceName;
  }


  private class FireChief extends Thread implements Closeable
  {
    private final FireDepartment fireDepartment;
    private final FireDepartmentMetrics metrics;

    private volatile FireDepartmentConfig config = null;
    private volatile Firehose firehose = null;
    private volatile Plumber plumber = null;
    private volatile boolean normalExit = true;

    public FireChief(
        FireDepartment fireDepartment
    )
    {
      this.fireDepartment = fireDepartment;

      this.metrics = fireDepartment.getMetrics();
    }

    public void init() throws IOException
    {
      config = fireDepartment.getConfig();

      synchronized (this) {
        try {
          log.info("Calling the FireDepartment and getting a Firehose.");
          firehose = fireDepartment.connect();
          log.info("Firehose acquired!");
          log.info("Someone get us a plumber!");
          plumber = fireDepartment.findPlumber();
          log.info("We have our plumber!");
        } catch (IOException e) {
          throw Throwables.propagate(e);
        }
      }
    }

    public FireDepartmentMetrics getMetrics()
    {
      return metrics;
    }

    @Override
    public void run()
    {
      verifyState();

      final Period intermediatePersistPeriod = config.getIntermediatePersistPeriod();

      try {
        plumber.startJob();

        long nextFlush = new DateTime().plus(intermediatePersistPeriod).getMillis();
        while (firehose.hasMore()) {
          final InputRow inputRow;
          try {
            try {
              inputRow = firehose.nextRow();
            } catch (Exception e) {
              log.debug(e, "thrown away line due to exception, considering unparseable");
              metrics.incrementUnparseable();
              continue;
            }

            final Sink sink = plumber.getSink(inputRow.getTimestampFromEpoch());
            if (sink == null) {
              metrics.incrementThrownAway();
              log.debug("Throwing away event[%s]", inputRow);

              if (System.currentTimeMillis() > nextFlush) {
                plumber.persist(firehose.commit());
                nextFlush = new DateTime().plus(intermediatePersistPeriod).getMillis();
              }

              continue;
            }

            int currCount = sink.add(inputRow);
            if (currCount >= config.getMaxRowsInMemory() || System.currentTimeMillis() > nextFlush) {
              plumber.persist(firehose.commit());
              nextFlush = new DateTime().plus(intermediatePersistPeriod).getMillis();
            }
            metrics.incrementProcessed();
          } catch (FormattedException e) {
            log.info(e, "unparseable line: %s", e.getDetails());
            metrics.incrementUnparseable();
            continue;
          }
        }
      } catch (RuntimeException e) {
        log.makeAlert(e, "RuntimeException aborted realtime processing[%s]", fireDepartment.getSchema().getDataSource())
            .emit();
        normalExit = false;
        throw e;
      } catch (Error e) {
        log.makeAlert(e, "Exception aborted realtime processing[%s]", fireDepartment.getSchema().getDataSource())
            .emit();
        normalExit = false;
        throw e;
      } finally {
        Closeables.closeQuietly(firehose);
        if (normalExit) {
          plumber.finishJob();
          plumber = null;
          firehose = null;
        }
      }
    }

    private void verifyState()
    {
      Preconditions.checkNotNull(config, "config is null, init() must be called first.");
      Preconditions.checkNotNull(firehose, "firehose is null, init() must be called first.");
      Preconditions.checkNotNull(plumber, "plumber is null, init() must be called first.");

      log.info("FireChief[%s] state ok.", fireDepartment.getSchema().getDataSource());
    }

    public  QueryRunner getQueryRunner(Query query)
    {
      QueryRunnerFactory> factory = conglomerate.findFactory(query);
      QueryToolChest> toolChest = factory.getToolchest();

      return new FinalizeResultsQueryRunner(plumber.getQueryRunner(query), toolChest);
    }

    public void close() throws IOException
    {
      synchronized (this) {
        if (firehose != null) {
          normalExit = false;
          firehose.close();
        }
      }
    }
  }
}