/*
    * 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.shared.jar.identification.exposers;
  
  import javax.inject.Inject;
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import org.apache.maven.artifact.Artifact;
  import org.apache.maven.shared.jar.JarAnalyzer;
  import org.apache.maven.shared.jar.identification.JarIdentification;
  import org.apache.maven.shared.jar.identification.JarIdentificationExposer;
  import org.apache.maven.shared.jar.identification.hash.JarHashAnalyzer;
  import org.apache.maven.shared.jar.identification.repository.RepositoryHashSearch;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * Exposer that examines a Maven repository for identical files to the JAR being analyzed. It will look for both
   * identical files, and files with identical classes.
   */
  @Singleton
  @Named("repositorySearch")
  public class RepositorySearchExposer implements JarIdentificationExposer {
      /**
       * The repository searcher to use.
       *
       * @todo this currently only provides for the 'empty' repository search, which isn't very useful
       */
      private final RepositoryHashSearch repositoryHashSearch;
  
      /**
       * The hash analyzer for the entire file.
       */
      private final JarHashAnalyzer fileHashAnalyzer;
  
      /**
       * The hash analyzer for the file's bytecode.
       */
      private final JarHashAnalyzer bytecodeHashAnalyzer;
  
      @Inject
      public RepositorySearchExposer(
              RepositoryHashSearch repositoryHashSearch,
              @Named("file") JarHashAnalyzer fileHashAnalyzer,
              @Named("bytecode") JarHashAnalyzer bytecodeHashAnalyzer) {
          this.repositoryHashSearch = requireNonNull(repositoryHashSearch);
          this.fileHashAnalyzer = requireNonNull(fileHashAnalyzer);
          this.bytecodeHashAnalyzer = requireNonNull(bytecodeHashAnalyzer);
      }
  
      @Override
      public void expose(JarIdentification identification, JarAnalyzer jarAnalyzer) {
          List<Artifact> repohits = new ArrayList<>();
  
          String hash = fileHashAnalyzer.computeHash(jarAnalyzer);
          if (hash != null) {
              repohits.addAll(repositoryHashSearch.searchFileHash(hash));
          }
  
          String bytecodehash = bytecodeHashAnalyzer.computeHash(jarAnalyzer);
          if (bytecodehash != null) {
              repohits.addAll(repositoryHashSearch.searchBytecodeHash(bytecodehash));
          }
  
          // Found hits in the repository.
          for (Artifact artifact : repohits) {
              identification.addAndSetGroupId(artifact.getGroupId());
              identification.addAndSetArtifactId(artifact.getArtifactId());
              identification.addAndSetVersion(artifact.getVersion());
          }
      }
  }