/*
    * 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;
  
  import javax.inject.Inject;
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  import java.util.List;
  
  import org.apache.maven.shared.jar.JarAnalyzer;
  import org.codehaus.plexus.util.StringUtils;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * Analyze the JAR file to identify Maven artifact metadata. This class is thread safe and immutable as long as all
   * provided exposers are, as it retains no state.
   *
   * If using Plexus, the class will use all available exposers in the container.
   *
   * Note that you must first create an instance of {@link org.apache.maven.shared.jar.JarAnalyzer} - see its Javadoc for
   * a typical use.
   */
  @Singleton
  @Named
  public class JarIdentificationAnalysis {
      /**
       * The Maven information exposers to use during identification.
       */
      private final List<JarIdentificationExposer> exposers;
  
      @Inject
      public JarIdentificationAnalysis(List<JarIdentificationExposer> exposers) {
          this.exposers = requireNonNull(exposers);
      }
  
      /**
       * Analyze a JAR and find any associated Maven metadata. Note that if the provided JAR analyzer has previously
       * analyzed the JAR, the cached results will be returned. You must obtain a new JAR analyzer to the re-read the
       * contents of the file.
       *
       * @param jarAnalyzer the JAR to analyze. This must not yet have been closed.
       * @return the Maven metadata discovered
       */
      public JarIdentification analyze(JarAnalyzer jarAnalyzer) {
          JarIdentification taxon = jarAnalyzer.getJarData().getJarIdentification();
          if (taxon != null) {
              return taxon;
          }
  
          taxon = new JarIdentification();
  
          for (JarIdentificationExposer exposer : exposers) {
              exposer.expose(taxon, jarAnalyzer);
          }
  
          normalize(taxon);
  
          jarAnalyzer.getJarData().setJarIdentification(taxon);
  
          return taxon;
      }
  
      private void normalize(JarIdentification taxon) {
          if (StringUtils.isEmpty(taxon.getGroupId())) {
              taxon.setGroupId(pickSmallest(taxon.getPotentialGroupIds()));
          }
  
          if (StringUtils.isEmpty(taxon.getArtifactId())) {
              taxon.setArtifactId(pickLargest(taxon.getPotentialArtifactIds()));
          }
  
          if (StringUtils.isEmpty(taxon.getVersion())) {
              taxon.setVersion(pickSmallest(taxon.getPotentialVersions()));
          }
  
          if (StringUtils.isEmpty(taxon.getName())) {
              taxon.setName(pickLargest(taxon.getPotentialNames()));
          }
  
          if (StringUtils.isEmpty(taxon.getVendor())) {
              taxon.setVendor(pickLargest(taxon.getPotentialVendors()));
         }
     }
 
     private String pickSmallest(List<String> list) {
         String smallest = null;
 
         int size = Integer.MAX_VALUE;
         for (String val : list) {
             if (val != null && !val.isEmpty()) {
                 if (val.length() < size) {
                     smallest = val;
                     size = val.length();
                 }
             }
         }
 
         return smallest;
     }
 
     private String pickLargest(List<String> list) {
         String largest = null;
         int size = Integer.MIN_VALUE;
         for (String val : list) {
             if (val != null && !val.isEmpty()) {
                 if (val.length() > size) {
                     largest = val;
                     size = val.length();
                 }
             }
         }
         return largest;
     }
 }