/*
    * 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.report.projectinfo;
  
  import javax.inject.Inject;
  import javax.inject.Named;
  
  import java.io.BufferedReader;
  import java.io.File;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  import java.io.LineNumberReader;
  import java.io.OutputStream;
  import java.nio.charset.StandardCharsets;
  import java.util.Locale;
  
  import org.apache.maven.artifact.Artifact;
  import org.apache.maven.artifact.resolver.filter.ArtifactFilter;
  import org.apache.maven.artifact.resolver.filter.ScopeArtifactFilter;
  import org.apache.maven.plugins.annotations.Mojo;
  import org.apache.maven.plugins.annotations.Parameter;
  import org.apache.maven.plugins.annotations.ResolutionScope;
  import org.apache.maven.project.DefaultProjectBuildingRequest;
  import org.apache.maven.project.ProjectBuilder;
  import org.apache.maven.project.ProjectBuildingRequest;
  import org.apache.maven.report.projectinfo.dependencies.Dependencies;
  import org.apache.maven.report.projectinfo.dependencies.DependenciesReportConfiguration;
  import org.apache.maven.report.projectinfo.dependencies.RepositoryUtils;
  import org.apache.maven.report.projectinfo.dependencies.renderer.DependenciesRenderer;
  import org.apache.maven.reporting.MavenReportException;
  import org.apache.maven.repository.RepositorySystem;
  import org.apache.maven.shared.dependency.graph.DependencyGraphBuilder;
  import org.apache.maven.shared.dependency.graph.DependencyGraphBuilderException;
  import org.apache.maven.shared.dependency.graph.DependencyNode;
  import org.apache.maven.shared.jar.classes.JarClassesAnalysis;
  import org.codehaus.plexus.i18n.I18N;
  import org.codehaus.plexus.util.IOUtil;
  
  /**
   * Generates the Project Dependencies report.
   *
   * @author <a href="mailto:jason@maven.org">Jason van Zyl </a>
   * @author <a href="mailto:vincent.siveton@gmail.com">Vincent Siveton </a>
   * @since 2.0
   */
  @Mojo(name = "dependencies", requiresDependencyResolution = ResolutionScope.TEST)
  public class DependenciesReport extends AbstractProjectInfoReport {
      /**
       * Images resources dir
       */
      private static final String RESOURCES_DIR = "org/apache/maven/report/projectinfo/resources";
  
      // ----------------------------------------------------------------------
      // Mojo parameters
      // ----------------------------------------------------------------------
  
      /**
       * Display file details for each dependency, such as: file size, number of
       * classes, number of packages etc.
       *
       * @since 2.1
       */
      @Parameter(property = "dependency.details.enabled", defaultValue = "true")
      private boolean dependencyDetailsEnabled;
  
      // ----------------------------------------------------------------------
      // Mojo components
      // ----------------------------------------------------------------------
  
      /**
       * Dependency graph builder component.
       *
       * @since 2.5
       */
      private final DependencyGraphBuilder dependencyGraphBuilder;
  
      /**
       * Jar classes analyzer component.
       *
       * @since 2.1
       */
     private final JarClassesAnalysis classesAnalyzer;
 
     private final RepositoryUtils repoUtils;
 
     @Inject
     protected DependenciesReport(
             RepositorySystem repositorySystem,
             I18N i18n,
             ProjectBuilder projectBuilder,
             @Named("default") DependencyGraphBuilder dependencyGraphBuilder,
             JarClassesAnalysis classesAnalyzer,
             RepositoryUtils repoUtils) {
         super(repositorySystem, i18n, projectBuilder);
         this.dependencyGraphBuilder = dependencyGraphBuilder;
         this.classesAnalyzer = classesAnalyzer;
         this.repoUtils = repoUtils;
     }
 
     // ----------------------------------------------------------------------
     // Public methods
     // ----------------------------------------------------------------------
 
     @Override
     public boolean canGenerateReport() throws MavenReportException {
         boolean result = super.canGenerateReport();
         if (result && skipEmptyReport) {
             // This seems to be a bit too much but the DependenciesRenderer applies the same logic
             DependencyNode dependencyNode = resolveProject();
             Dependencies dependencies = new Dependencies(project, dependencyNode, classesAnalyzer);
             result = dependencies.hasDependencies();
         }
 
         return result;
     }
 
     @Override
     public void executeReport(Locale locale) {
         try {
             copyResources(getReportOutputDirectory());
         } catch (IOException e) {
             getLog().error("Cannot copy resources", e);
         }
 
         DependencyNode dependencyNode = resolveProject();
 
         Dependencies dependencies = new Dependencies(project, dependencyNode, classesAnalyzer);
 
         DependenciesReportConfiguration config = new DependenciesReportConfiguration(dependencyDetailsEnabled);
 
         DependenciesRenderer r = new DependenciesRenderer(
                 getSink(),
                 locale,
                 getI18N(locale),
                 getLog(),
                 dependencies,
                 dependencyNode,
                 config,
                 repoUtils,
                 getLicenseMappings());
         r.render();
     }
 
     /**
      * {@inheritDoc}
      */
     public String getOutputName() {
         return "dependencies";
     }
 
     @Override
     protected String getI18Nsection() {
         return "dependencies";
     }
 
     // ----------------------------------------------------------------------
     // Private methods
     // ----------------------------------------------------------------------
 
     /**
      * @return resolve the dependency tree
      */
     private DependencyNode resolveProject() {
         try {
             ArtifactFilter artifactFilter = new ScopeArtifactFilter(Artifact.SCOPE_TEST);
             ProjectBuildingRequest buildingRequest =
                     new DefaultProjectBuildingRequest(getSession().getProjectBuildingRequest());
             buildingRequest.setProject(project);
             return dependencyGraphBuilder.buildDependencyGraph(buildingRequest, artifactFilter);
         } catch (DependencyGraphBuilderException e) {
             getLog().error("Unable to build dependency tree.", e);
             return null;
         }
     }
 
     /**
      * @param outputDirectory the wanted output directory
      * @throws IOException if any
      */
     private void copyResources(File outputDirectory) throws IOException {
         InputStream resourceList = getClass().getClassLoader().getResourceAsStream(RESOURCES_DIR + "/resources.txt");
         if (resourceList != null) {
             try (BufferedReader reader =
                     new LineNumberReader(new InputStreamReader(resourceList, StandardCharsets.US_ASCII))) {
                 for (String line = reader.readLine(); line != null; line = reader.readLine()) {
                     try (InputStream in = getClass().getClassLoader().getResourceAsStream(RESOURCES_DIR + "/" + line)) {
                         if (in == null) {
                             throw new IOException("The resource " + line + " doesn't exist.");
                         }
 
                         File outputFile = new File(outputDirectory, line);
                         if (!outputFile.getParentFile().exists()) {
                             outputFile.getParentFile().mkdirs();
                         }
 
                         try (OutputStream out = new FileOutputStream(outputFile)) {
                             IOUtil.copy(in, out);
                         }
                     }
                 }
             }
         }
     }
 }