/*
    * 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.maven.index.archetype;
  
  import javax.inject.Inject;
  
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.Properties;
  
  import org.apache.lucene.search.Query;
  import org.apache.maven.archetype.catalog.Archetype;
  import org.apache.maven.archetype.catalog.ArchetypeCatalog;
  import org.apache.maven.index.ArtifactInfo;
  import org.apache.maven.index.FlatSearchRequest;
  import org.apache.maven.index.FlatSearchResponse;
  import org.apache.maven.index.Indexer;
  import org.apache.maven.index.MAVEN;
  import org.apache.maven.index.context.IndexingContext;
  import org.apache.maven.index.expr.SourcedSearchExpression;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Support class to implement {@code org.apache.maven.archetype.source.ArchetypeDataSource} interface. Extend this class
   * to suit your needs.
   */
  public abstract class AbstractArchetypeDataSource {
  
      private final Logger logger = LoggerFactory.getLogger(getClass());
  
      protected Logger getLogger() {
          return logger;
      }
  
      private final Indexer indexer;
  
      @Inject
      protected AbstractArchetypeDataSource(Indexer indexer) {
          this.indexer = indexer;
      }
  
      public ArchetypeCatalog getArchetypeCatalog(final Properties properties) {
          final ArchetypeCatalog catalog = new ArchetypeCatalog();
          try {
              final Map<String, String> repositories = getRepositoryMap();
              final Query pq = indexer.constructQuery(MAVEN.PACKAGING, new SourcedSearchExpression("maven-archetype"));
              final FlatSearchRequest searchRequest = new FlatSearchRequest(pq);
              searchRequest.setContexts(getIndexingContexts());
              final FlatSearchResponse searchResponse = indexer.searchFlat(searchRequest);
              for (ArtifactInfo info : searchResponse.getResults()) {
                  Archetype archetype = new Archetype();
                  archetype.setGroupId(info.getGroupId());
                  archetype.setArtifactId(info.getArtifactId());
                  archetype.setVersion(info.getVersion());
                  archetype.setDescription(info.getDescription());
                  archetype.setRepository(repositories.get(info.getRepository()));
                  catalog.addArchetype(archetype);
              }
          } catch (Exception ex) {
              getLogger().error("Unable to retrieve archetypes", ex);
          }
  
          return catalog;
      }
  
      private Map<String, String> getRepositoryMap() {
          // can't cache this because indexes can be changed
          Map<String, String> repositories = new HashMap<>();
  
          for (IndexingContext context : getIndexingContexts()) {
              String repositoryUrl = context.getRepositoryUrl();
              if (repositoryUrl != null) {
                  repositories.put(context.getId(), repositoryUrl);
              }
          }
  
          return repositories;
      }
  
      public void updateCatalog(Properties properties, Archetype archetype) {
          // TODO maybe update index
     }
 
     // ==
 
     protected abstract List<IndexingContext> getIndexingContexts();
 }