/*
    * 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.archetype.ui.generation;
  
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.LinkedHashMap;
  import java.util.List;
  import java.util.Map;
  
  import org.apache.commons.lang3.StringUtils;
  import org.apache.maven.archetype.catalog.Archetype;
  
  /**
   * @author Olivier Lamy
   * @since 2.1
   */
  public class ArchetypeSelectorUtils {
      private ArchetypeSelectorUtils() {
          // no constructor for utility class
      }
  
      private static String extractGroupIdFromFilter(String filter) {
          return StringUtils.contains(filter, ':') ? StringUtils.substringBefore(filter, ":") : null;
      }
  
      private static String extractArtifactIdFromFilter(String filter) {
          // if no : the full text is considered as artifactId content
          return StringUtils.contains(filter, ':') ? StringUtils.substringAfter(filter, ":") : filter;
      }
  
      /**
       * apply some filtering on archetypes.
       * currently only on artifactId contains filter
       *
       * @param archetypesPerCatalog
       * @return
       */
      public static Map<String, List<Archetype>> getFilteredArchetypesByCatalog(
              Map<String, List<Archetype>> archetypesPerCatalog, String filter) {
          if (archetypesPerCatalog == null || archetypesPerCatalog.isEmpty()) {
              return Collections.emptyMap();
          }
          Map<String, List<Archetype>> filtered = new LinkedHashMap<>(archetypesPerCatalog.size());
  
          for (Map.Entry<String, List<Archetype>> entry : archetypesPerCatalog.entrySet()) {
              List<Archetype> archetypes = new ArrayList<>();
  
              for (Archetype archetype : entry.getValue()) {
                  String groupId = ArchetypeSelectorUtils.extractGroupIdFromFilter(filter);
                  String artifactId = ArchetypeSelectorUtils.extractArtifactIdFromFilter(filter);
  
                  if (((groupId == null) || StringUtils.contains(archetype.getGroupId(), groupId))
                          && StringUtils.contains(archetype.getArtifactId(), artifactId)) {
                      archetypes.add(archetype);
                  }
              }
  
              if (!archetypes.isEmpty()) {
                  filtered.put(entry.getKey(), archetypes);
              }
          }
  
          return filtered;
      }
  }