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/*
 * Licensed to Metamarkets Group Inc. (Metamarkets) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Metamarkets 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 io.druid.indexing.common;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.common.base.Function;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Maps;
import com.google.common.collect.Multimap;
import com.google.common.collect.Multimaps;
import com.metamx.emitter.service.ServiceEmitter;
import com.metamx.metrics.MonitorScheduler;
import io.druid.client.cache.Cache;
import io.druid.client.cache.CacheConfig;
import io.druid.indexing.common.actions.SegmentInsertAction;
import io.druid.indexing.common.actions.TaskActionClient;
import io.druid.indexing.common.config.TaskConfig;
import io.druid.indexing.common.task.Task;
import io.druid.query.QueryRunnerFactoryConglomerate;
import io.druid.segment.IndexIO;
import io.druid.segment.IndexMerger;
import io.druid.segment.IndexMergerV9;
import io.druid.segment.loading.DataSegmentArchiver;
import io.druid.segment.loading.DataSegmentKiller;
import io.druid.segment.loading.DataSegmentMover;
import io.druid.segment.loading.DataSegmentPusher;
import io.druid.segment.loading.SegmentLoader;
import io.druid.segment.loading.SegmentLoadingException;
import io.druid.segment.realtime.plumber.SegmentHandoffNotifierFactory;
import io.druid.server.coordination.DataSegmentAnnouncer;
import io.druid.timeline.DataSegment;
import org.joda.time.Interval;

import java.io.File;
import java.io.IOException;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ExecutorService;

/**
 * Stuff that may be needed by a Task in order to conduct its business.
 */
public class TaskToolbox
{
  private final TaskConfig config;
  private final Task task;
  private final TaskActionClient taskActionClient;
  private final ServiceEmitter emitter;
  private final DataSegmentPusher segmentPusher;
  private final DataSegmentKiller dataSegmentKiller;
  private final DataSegmentArchiver dataSegmentArchiver;
  private final DataSegmentMover dataSegmentMover;
  private final DataSegmentAnnouncer segmentAnnouncer;
  private final SegmentHandoffNotifierFactory handoffNotifierFactory;
  private final QueryRunnerFactoryConglomerate queryRunnerFactoryConglomerate;
  private final MonitorScheduler monitorScheduler;
  private final ExecutorService queryExecutorService;
  private final SegmentLoader segmentLoader;
  private final ObjectMapper objectMapper;
  private final File taskWorkDir;
  private final IndexMerger indexMerger;
  private final IndexIO indexIO;
  private final Cache cache;
  private final CacheConfig cacheConfig;
  private final IndexMergerV9 indexMergerV9;

  public TaskToolbox(
      TaskConfig config,
      Task task,
      TaskActionClient taskActionClient,
      ServiceEmitter emitter,
      DataSegmentPusher segmentPusher,
      DataSegmentKiller dataSegmentKiller,
      DataSegmentMover dataSegmentMover,
      DataSegmentArchiver dataSegmentArchiver,
      DataSegmentAnnouncer segmentAnnouncer,
      SegmentHandoffNotifierFactory handoffNotifierFactory,
      QueryRunnerFactoryConglomerate queryRunnerFactoryConglomerate,
      ExecutorService queryExecutorService,
      MonitorScheduler monitorScheduler,
      SegmentLoader segmentLoader,
      ObjectMapper objectMapper,
      File taskWorkDir,
      IndexMerger indexMerger,
      IndexIO indexIO,
      Cache cache,
      CacheConfig cacheConfig,
      IndexMergerV9 indexMergerV9
  )
  {
    this.config = config;
    this.task = task;
    this.taskActionClient = taskActionClient;
    this.emitter = emitter;
    this.segmentPusher = segmentPusher;
    this.dataSegmentKiller = dataSegmentKiller;
    this.dataSegmentMover = dataSegmentMover;
    this.dataSegmentArchiver = dataSegmentArchiver;
    this.segmentAnnouncer = segmentAnnouncer;
    this.handoffNotifierFactory = handoffNotifierFactory;
    this.queryRunnerFactoryConglomerate = queryRunnerFactoryConglomerate;
    this.queryExecutorService = queryExecutorService;
    this.monitorScheduler = monitorScheduler;
    this.segmentLoader = segmentLoader;
    this.objectMapper = objectMapper;
    this.taskWorkDir = taskWorkDir;
    this.indexMerger = Preconditions.checkNotNull(indexMerger, "Null IndexMerger");
    this.indexIO = Preconditions.checkNotNull(indexIO, "Null IndexIO");
    this.cache = cache;
    this.cacheConfig = cacheConfig;
    this.indexMergerV9 = Preconditions.checkNotNull(indexMergerV9, "Null IndexMergerV9");
  }

  public TaskConfig getConfig()
  {
    return config;
  }

  public TaskActionClient getTaskActionClient()
  {
    return taskActionClient;
  }

  public ServiceEmitter getEmitter()
  {
    return emitter;
  }

  public DataSegmentPusher getSegmentPusher()
  {
    return segmentPusher;
  }

  public DataSegmentKiller getDataSegmentKiller()
  {
    return dataSegmentKiller;
  }

  public DataSegmentMover getDataSegmentMover()
  {
    return dataSegmentMover;
  }

  public DataSegmentArchiver getDataSegmentArchiver()
  {
    return dataSegmentArchiver;
  }

  public DataSegmentAnnouncer getSegmentAnnouncer()
  {
    return segmentAnnouncer;
  }

  public SegmentHandoffNotifierFactory getSegmentHandoffNotifierFactory()
  {
    return handoffNotifierFactory;
  }

  public QueryRunnerFactoryConglomerate getQueryRunnerFactoryConglomerate()
  {
    return queryRunnerFactoryConglomerate;
  }

  public ExecutorService getQueryExecutorService()
  {
    return queryExecutorService;
  }

  public MonitorScheduler getMonitorScheduler()
  {
    return monitorScheduler;
  }

  public ObjectMapper getObjectMapper()
  {
    return objectMapper;
  }

  public Map fetchSegments(List segments)
      throws SegmentLoadingException
  {
    Map retVal = Maps.newLinkedHashMap();
    for (DataSegment segment : segments) {
      retVal.put(segment, segmentLoader.getSegmentFiles(segment));
    }

    return retVal;
  }

  public void publishSegments(Iterable segments) throws IOException
  {
    // Request segment pushes for each set
    final Multimap segmentMultimap = Multimaps.index(
        segments,
        new Function()
        {
          @Override
          public Interval apply(DataSegment segment)
          {
            return segment.getInterval();
          }
        }
    );
    for (final Collection segmentCollection : segmentMultimap.asMap().values()) {
      getTaskActionClient().submit(new SegmentInsertAction(ImmutableSet.copyOf(segmentCollection)));
    }
  }

  public File getTaskWorkDir()
  {
    return taskWorkDir;
  }

  public IndexIO getIndexIO()
  {
    return indexIO;
  }

  public IndexMerger getIndexMerger()
  {
    return indexMerger;
  }

  public Cache getCache()
  {
    return cache;
  }

  public CacheConfig getCacheConfig()
  {
    return cacheConfig;
  }

  public IndexMergerV9 getIndexMergerV9() {
    return indexMergerV9;
  }
}