/*
    * 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.Named;
  import javax.inject.Singleton;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  import java.util.List;
  import java.util.jar.JarEntry;
  
  import org.apache.maven.model.Model;
  import org.apache.maven.model.Organization;
  import org.apache.maven.model.io.xpp3.MavenXpp3Reader;
  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.codehaus.plexus.util.xml.pull.XmlPullParserException;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Exposer that examines a JAR file for any embedded Maven metadata for identification.
   */
  @Singleton
  @Named("embeddedMavenModel")
  public class EmbeddedMavenModelExposer implements JarIdentificationExposer {
      private final Logger logger = LoggerFactory.getLogger(getClass());
  
      @Override
      public void expose(JarIdentification identification, JarAnalyzer jarAnalyzer) {
          List<JarEntry> entries = jarAnalyzer.getMavenPomEntries();
          if (entries.isEmpty()) {
              return;
          }
  
          if (entries.size() > 1) {
              logger.warn("More than one Maven model entry was found in the JAR, using only the first of: " + entries);
          }
  
          JarEntry pom = entries.get(0);
          MavenXpp3Reader pomreader = new MavenXpp3Reader();
          try (InputStream is = jarAnalyzer.getEntryInputStream(pom);
                  InputStreamReader isreader = new InputStreamReader(is)) {
              Model model = pomreader.read(isreader);
  
              if (model.getParent() != null) {
                  // use parent values only if project values not exists
                  if (model.getGroupId() == null) {
                      identification.addAndSetGroupId(model.getParent().getGroupId());
                  }
                  if (model.getVersion() == null) {
                      identification.addAndSetVersion(model.getParent().getVersion());
                  }
              }
  
              identification.addAndSetGroupId(model.getGroupId());
              identification.addAndSetArtifactId(model.getArtifactId());
              identification.addAndSetVersion(model.getVersion());
              identification.addAndSetName(model.getName());
  
              // TODO: suboptimal - we are reproducing Maven's built in default
              if (model.getName() == null) {
                  identification.addAndSetName(model.getArtifactId());
              }
  
              Organization org = model.getOrganization();
              if (org != null) {
                  identification.addAndSetVendor(org.getName());
              }
          } catch (IOException e) {
              logger.error("Unable to read model " + pom.getName() + " in " + jarAnalyzer.getFile() + ".", e);
          } catch (XmlPullParserException e) {
              logger.error("Unable to parse model " + pom.getName() + " in " + jarAnalyzer.getFile() + ".", e);
          }
      }
  }