package org.apache.archiva.indexer.merger.base;
   /*
    * 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.
   */
  
  import org.apache.archiva.indexer.ArchivaIndexManager;
  import org.apache.archiva.indexer.ArchivaIndexingContext;
  import org.apache.archiva.indexer.IndexCreationFailedException;
  import org.apache.archiva.indexer.merger.IndexMerger;
  import org.apache.archiva.indexer.merger.IndexMergerException;
  import org.apache.archiva.indexer.merger.IndexMergerRequest;
  import org.apache.archiva.indexer.merger.TemporaryGroupIndex;
  import org.apache.archiva.repository.Repository;
  import org.apache.archiva.repository.RepositoryRegistry;
  import org.apache.archiva.repository.storage.StorageAsset;
  import org.apache.archiva.repository.storage.StorageUtil;
  import org.apache.commons.lang3.time.StopWatch;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.scheduling.annotation.Async;
  import org.springframework.stereotype.Service;
  
  import javax.inject.Inject;
  import java.io.IOException;
  import java.util.Collection;
  import java.util.List;
  import java.util.Optional;
  import java.util.concurrent.CopyOnWriteArrayList;
  import java.util.stream.Collectors;
  
  /**
   * @author Olivier Lamy
   * @since 1.4-M2
   */
  @Service("indexMerger#default")
  public class DefaultIndexMerger
      implements IndexMerger
  {
  
      @Inject
      RepositoryRegistry repositoryRegistry;
  
      private Logger log = LoggerFactory.getLogger( getClass() );
  
      private List<TemporaryGroupIndex> temporaryGroupIndexes = new CopyOnWriteArrayList<>();
  
      private List<ArchivaIndexingContext>  temporaryContextes = new CopyOnWriteArrayList<>(  );
  
      private List<String> runningGroups = new CopyOnWriteArrayList<>();
  
      @Inject
      public DefaultIndexMerger( )
      {
      }
  
      @Override
      public ArchivaIndexingContext buildMergedIndex(IndexMergerRequest indexMergerRequest )
          throws IndexMergerException
      {
          String groupId = indexMergerRequest.getGroupId();
  
          if ( runningGroups.contains( groupId ) )
          {
              log.info( "skip build merge remote indexes for id: '{}' as already running", groupId );
              return null;
          }
  
          runningGroups.add( groupId );
          StopWatch stopWatch = new StopWatch();
          try {
              stopWatch.reset();
              stopWatch.start();
  
              StorageAsset mergedIndexDirectory = indexMergerRequest.getMergedIndexDirectory();
              Repository destinationRepository = repositoryRegistry.getRepository(indexMergerRequest.getGroupId());
  
              ArchivaIndexManager idxManager = repositoryRegistry.getIndexManager(destinationRepository.getType());
              List<ArchivaIndexingContext> sourceContexts = indexMergerRequest.getRepositoriesIds().stream().map(id -> repositoryRegistry.getRepository(id).getIndexingContext()).collect(Collectors.toList());
              try {
                  ArchivaIndexingContext result = idxManager.mergeContexts(destinationRepository, sourceContexts, indexMergerRequest.isPackIndex());
                  if ( indexMergerRequest.isTemporary() )
                  {
                      String tempRepoId = destinationRepository.getId()+System.currentTimeMillis();
                      temporaryGroupIndexes.add( new TemporaryGroupIndex( mergedIndexDirectory, tempRepoId, groupId,
                             indexMergerRequest.getMergedIndexTtl() ) );
                     temporaryContextes.add(result);
                 }
                 return result;
             } catch (IndexCreationFailedException e) {
                 throw new IndexMergerException("Index merging failed " + e.getMessage(), e);
             }
 
         } finally {
             stopWatch.stop();
             log.info( "merged index for repos {} in {} s", indexMergerRequest.getRepositoriesIds(),
                     stopWatch.getTime() );
             runningGroups.remove(groupId);
         }
     }
 
     @Async
     @Override
     public void cleanTemporaryGroupIndex( TemporaryGroupIndex temporaryGroupIndex )
     {
         if ( temporaryGroupIndex == null )
         {
             return;
         }
 
         try
         {
             Optional<ArchivaIndexingContext> ctxOpt = temporaryContextes.stream( ).filter( ctx -> ctx.getId( ).equals( temporaryGroupIndex.getIndexId( ) ) ).findFirst( );
             if (ctxOpt.isPresent()) {
                 ArchivaIndexingContext ctx = ctxOpt.get();
                 ctx.close(true);
                 temporaryGroupIndexes.remove( temporaryGroupIndex );
                 temporaryContextes.remove( ctx );
                 StorageAsset directory = temporaryGroupIndex.getDirectory();
                 if ( directory != null && directory.exists() )
                 {
                     StorageUtil.deleteRecursively( directory );
                 }
             }
         }
         catch ( IOException e )
         {
             log.warn( "fail to delete temporary group index {}", temporaryGroupIndex.getIndexId(), e );
         }
     }
 
     @Override
     public Collection<TemporaryGroupIndex> getTemporaryGroupIndexes()
     {
         return this.temporaryGroupIndexes;
     }
 }