/*
    * 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.reporting.exec;
  
  import javax.inject.Inject;
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Objects;
  import java.util.Set;
  
  import org.apache.maven.lifecycle.LifecycleExecutor;
  import org.apache.maven.model.Build;
  import org.apache.maven.model.Plugin;
  import org.apache.maven.plugin.MavenPluginManager;
  import org.apache.maven.plugin.Mojo;
  import org.apache.maven.plugin.MojoExecution;
  import org.apache.maven.plugin.MojoExecutionException;
  import org.apache.maven.plugin.MojoNotFoundException;
  import org.apache.maven.plugin.PluginConfigurationException;
  import org.apache.maven.plugin.PluginContainerException;
  import org.apache.maven.plugin.descriptor.MojoDescriptor;
  import org.apache.maven.plugin.descriptor.PluginDescriptor;
  import org.apache.maven.plugin.version.DefaultPluginVersionRequest;
  import org.apache.maven.plugin.version.PluginVersionRequest;
  import org.apache.maven.plugin.version.PluginVersionResolutionException;
  import org.apache.maven.plugin.version.PluginVersionResolver;
  import org.apache.maven.plugin.version.PluginVersionResult;
  import org.apache.maven.project.MavenProject;
  import org.apache.maven.reporting.MavenReport;
  import org.codehaus.plexus.configuration.PlexusConfiguration;
  import org.codehaus.plexus.util.StringUtils;
  import org.codehaus.plexus.util.xml.Xpp3Dom;
  import org.codehaus.plexus.util.xml.Xpp3DomUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * <p>
   * This component will build some {@link MavenReportExecution} from {@link MavenReportExecutorRequest}. If a
   * {@link MavenReport} needs to fork a lifecycle, this fork is executed here. It will ask the core to get some
   * informations in order to correctly setup {@link MavenReport}.
   * </p>
   * <p>
   * <b>Note</b> if no version is defined in the report plugin, the version will be searched with
   * {@link #resolvePluginVersion(ReportPlugin, MavenReportExecutorRequest) resolvePluginVersion(...)} method:
   * </p>
   * <ol>
   * <li>use the one defined in the reportPlugin configuration,</li>
   * <li>search similar (same groupId and artifactId) plugin in the build/plugins section of the pom,</li>
   * <li>search similar (same groupId and artifactId) plugin in the build/pluginManagement section of the pom,</li>
   * <li>ask {@link PluginVersionResolver} to get a fallback version (display a warning as it's not a recommended use).
   * </li>
   * </ol>
   * <p>
   * Following steps are done:
   * </p>
   * <ul>
   * <li>get {@link PluginDescriptor} from the {@link MavenPluginManager} (through
   * {@link MavenPluginManagerHelper#getPluginDescriptor(Plugin, org.apache.maven.execution.MavenSession)
   * MavenPluginManagerHelper.getPluginDescriptor(...)} to protect from core API change)</li>
   * <li>setup a {@link ClassLoader}, with the Site plugin classloader as parent for the report execution. <br>
   * Notice that some classes are imported from the current Site plugin ClassRealm: see {@link #IMPORTS}. Corresponding
   * artifacts are excluded from the artifact resolution: <code>doxia-site-renderer</code>, <code>doxia-sink-api</code>
   *  and <code>maven-reporting-api</code>.<br>
   * Work is done using {@link MavenPluginManager} (through
   * {@link MavenPluginManagerHelper#setupPluginRealm(PluginDescriptor, MavenSession, ClassLoader, List, List)
   * MavenPluginManagerHelper.setupPluginRealm(...)} to protect from core API change)</li>
   * <li>setup the mojo using {@link MavenPluginManager#getConfiguredMojo(Class, MavenSession, MojoExecution)
   * MavenPluginManager.getConfiguredMojo(...)}</li>
   * <li>verify with {@link LifecycleExecutor#calculateForkedExecutions(MojoExecution, MavenSession)
   * LifecycleExecutor.calculateForkedExecutions(...)} if any forked execution is needed: if yes, execute the forked
   * execution here</li>
   * </ul>
   *
   * @author Olivier Lamy
  */
 @Singleton
 @Named
 public class DefaultMavenReportExecutor implements MavenReportExecutor {
     private static final Logger LOGGER = LoggerFactory.getLogger(DefaultMavenReportExecutor.class);
 
     private final MavenPluginManager mavenPluginManager;
 
     private final MavenPluginManagerHelper mavenPluginManagerHelper;
 
     private final LifecycleExecutor lifecycleExecutor;
 
     private final PluginVersionResolver pluginVersionResolver;
 
     private static final List<String> IMPORTS = Arrays.asList(
             "org.apache.maven.reporting.MavenReport",
             "org.apache.maven.reporting.MavenMultiPageReport",
             // TODO Will be removed after Doxia 2.0.0
             "org.apache.maven.doxia.siterenderer.Renderer",
             "org.apache.maven.doxia.siterenderer.SiteRenderer",
             "org.apache.maven.doxia.sink.SinkFactory",
             // TODO Will be removed after Doxia 2.0.0
             "org.codehaus.doxia.sink.Sink",
             "org.apache.maven.doxia.sink.Sink",
             "org.apache.maven.doxia.sink.SinkEventAttributes",
             // TODO Will be removed with Doxia 2.0.0
             "org.apache.maven.doxia.logging.LogEnabled",
             // TODO Will be removed with Doxia 2.0.0
             "org.apache.maven.doxia.logging.Log");
 
     private static final List<String> EXCLUDES =
             Arrays.asList("doxia-site-renderer", "doxia-sink-api", "maven-reporting-api");
 
     @Inject
     public DefaultMavenReportExecutor(
             MavenPluginManager mavenPluginManager,
             MavenPluginManagerHelper mavenPluginManagerHelper,
             LifecycleExecutor lifecycleExecutor,
             PluginVersionResolver pluginVersionResolver) {
         this.mavenPluginManager = requireNonNull(mavenPluginManager);
         this.mavenPluginManagerHelper = requireNonNull(mavenPluginManagerHelper);
         this.lifecycleExecutor = requireNonNull(lifecycleExecutor);
         this.pluginVersionResolver = requireNonNull(pluginVersionResolver);
     }
 
     @Override
     public List<MavenReportExecution> buildMavenReports(MavenReportExecutorRequest mavenReportExecutorRequest)
             throws MojoExecutionException {
         if (mavenReportExecutorRequest.getReportPlugins() == null) {
             return Collections.emptyList();
         }
 
         Set<String> reportPluginKeys = new HashSet<>();
         List<MavenReportExecution> reportExecutions = new ArrayList<>();
 
         String pluginKey = "";
         try {
             for (ReportPlugin reportPlugin : mavenReportExecutorRequest.getReportPlugins()) {
                 pluginKey = reportPlugin.getGroupId() + ':' + reportPlugin.getArtifactId();
 
                 if (!reportPluginKeys.add(pluginKey)) {
                     LOGGER.info("Plugin {} will be executed more than one time", pluginKey);
                 }
 
                 reportExecutions.addAll(buildReportPlugin(mavenReportExecutorRequest, reportPlugin));
             }
         } catch (Exception e) {
             throw new MojoExecutionException("Failed to get report for " + pluginKey, e);
         }
 
         return reportExecutions;
     }
 
     protected List<MavenReportExecution> buildReportPlugin(
             MavenReportExecutorRequest mavenReportExecutorRequest, ReportPlugin reportPlugin) throws Exception {
         // step 1: prepare the plugin
         Plugin plugin = new Plugin();
         plugin.setGroupId(reportPlugin.getGroupId());
         plugin.setArtifactId(reportPlugin.getArtifactId());
         plugin.setVersion(resolvePluginVersion(reportPlugin, mavenReportExecutorRequest));
         LOGGER.info("Configuring report plugin {}:{}", plugin.getArtifactId(), plugin.getVersion());
 
         mergePluginToReportPlugin(mavenReportExecutorRequest, plugin, reportPlugin);
 
         PluginDescriptor pluginDescriptor =
                 mavenPluginManagerHelper.getPluginDescriptor(plugin, mavenReportExecutorRequest.getMavenSession());
 
         // step 2: prepare the goals
         List<GoalWithConf> goalsWithConfiguration = new ArrayList<>();
         boolean hasUserDefinedReports = prepareGoals(reportPlugin, pluginDescriptor, goalsWithConfiguration);
 
         // step 3: prepare the reports
         List<MavenReportExecution> reports = new ArrayList<>(goalsWithConfiguration.size());
         for (GoalWithConf report : goalsWithConfiguration) {
             MavenReportExecution mavenReportExecution =
                     prepareReportExecution(mavenReportExecutorRequest, report, hasUserDefinedReports);
 
             if (mavenReportExecution != null) {
                 // ok, report is ready to generate
                 reports.add(mavenReportExecution);
             }
         }
 
         if (!reports.isEmpty()) {
             // log reports, either configured or detected
             StringBuilder buff = new StringBuilder();
             for (MavenReportExecution mre : reports) {
                 if (buff.length() > 0) {
                     buff.append(", ");
                 }
                 buff.append(mre.getGoal());
             }
             LOGGER.info(
                     "{} {} report{} for {}:{}: {}",
                     (hasUserDefinedReports ? "Configured" : "Detected"),
                     reports.size(),
                     (reports.size() > 1 ? "s" : ""),
                     plugin.getArtifactId(),
                     plugin.getVersion(),
                     buff);
         }
 
         return reports;
     }
 
     private boolean prepareGoals(
             ReportPlugin reportPlugin, PluginDescriptor pluginDescriptor, List<GoalWithConf> goalsWithConfiguration) {
         if (reportPlugin.getReportSets().isEmpty() && reportPlugin.getReports().isEmpty()) {
             // by default, use every goal, which will be filtered later to only keep reporting goals
             List<MojoDescriptor> mojoDescriptors = pluginDescriptor.getMojos();
             for (MojoDescriptor mojoDescriptor : mojoDescriptors) {
                 goalsWithConfiguration.add(new GoalWithConf(
                         reportPlugin, pluginDescriptor, mojoDescriptor.getGoal(), mojoDescriptor.getConfiguration()));
             }
 
             return false;
         }
 
         Set<String> goals = new HashSet<>();
         for (String report : reportPlugin.getReports()) {
             if (goals.add(report)) {
                 goalsWithConfiguration.add(
                         new GoalWithConf(reportPlugin, pluginDescriptor, report, reportPlugin.getConfiguration()));
             } else {
                 LOGGER.warn("{} report is declared twice in default reports", report);
             }
         }
 
         for (ReportSet reportSet : reportPlugin.getReportSets()) {
             goals = new HashSet<>();
             for (String report : reportSet.getReports()) {
                 if (goals.add(report)) {
                     goalsWithConfiguration.add(
                             new GoalWithConf(reportPlugin, pluginDescriptor, report, reportSet.getConfiguration()));
                 } else {
                     LOGGER.warn("{} report is declared twice in {} reportSet", report, reportSet.getId());
                 }
             }
         }
 
         return true;
     }
 
     private MavenReportExecution prepareReportExecution(
             MavenReportExecutorRequest mavenReportExecutorRequest, GoalWithConf report, boolean hasUserDefinedReports)
             throws Exception {
         ReportPlugin reportPlugin = report.getReportPlugin();
         PluginDescriptor pluginDescriptor = report.getPluginDescriptor();
 
         MojoDescriptor mojoDescriptor = pluginDescriptor.getMojo(report.getGoal());
         if (mojoDescriptor == null) {
             throw new MojoNotFoundException(report.getGoal(), pluginDescriptor);
         }
 
         MavenProject project = mavenReportExecutorRequest.getProject();
         if (!hasUserDefinedReports && mojoDescriptor.isAggregator() && !canAggregate(project)) {
             // aggregator mojos automatically added from plugin are only run at execution root
             return null;
         }
 
         MojoExecution mojoExecution = new MojoExecution(
                 pluginDescriptor.getPlugin(), report.getGoal(), mavenReportExecutorRequest.getExecutionId());
 
         mojoExecution.setMojoDescriptor(mojoDescriptor);
 
         mavenPluginManagerHelper.setupPluginRealm(
                 pluginDescriptor,
                 mavenReportExecutorRequest.getMavenSession(),
                 Thread.currentThread().getContextClassLoader(),
                 IMPORTS,
                 EXCLUDES);
 
         if (!isMavenReport(mojoExecution, pluginDescriptor)) {
             if (hasUserDefinedReports) {
                 // reports were explicitly written in the POM
                 LOGGER.warn(
                         "Ignoring {}:{}"
                                 + " goal since it is not a report: should be removed from reporting configuration in POM",
                         mojoExecution.getPlugin().getId(),
                         report.getGoal());
             }
             return null;
         }
 
         Xpp3Dom pluginMgmtConfiguration = null;
         if (project.getBuild() != null && project.getBuild().getPluginManagement() != null) {
             Plugin pluginMgmt =
                     find(reportPlugin, project.getBuild().getPluginManagement().getPlugins());
 
             if (pluginMgmt != null) {
                 pluginMgmtConfiguration = (Xpp3Dom) pluginMgmt.getConfiguration();
             }
         }
 
         mojoExecution.setConfiguration(mergeConfiguration(
                 mojoDescriptor.getMojoConfiguration(),
                 pluginMgmtConfiguration,
                 reportPlugin.getConfiguration(),
                 report.getConfiguration(),
                 mojoDescriptor.getParameterMap().keySet()));
 
         MavenReport mavenReport = getConfiguredMavenReport(mojoExecution, pluginDescriptor, mavenReportExecutorRequest);
 
         MavenReportExecution mavenReportExecution = new MavenReportExecution(
                 report.getGoal(), mojoExecution.getPlugin(), mavenReport, pluginDescriptor.getClassRealm());
 
         lifecycleExecutor.calculateForkedExecutions(mojoExecution, mavenReportExecutorRequest.getMavenSession());
 
         if (!mojoExecution.getForkedExecutions().isEmpty()) {
             String reportDescription = pluginDescriptor.getArtifactId() + ":" + report.getGoal() + " report";
 
             String execution;
             if (StringUtils.isNotEmpty(mojoDescriptor.getExecutePhase())) {
                 // forked phase
                 execution = "'"
                         + (StringUtils.isEmpty(mojoDescriptor.getExecuteLifecycle())
                                 ? ""
                                 : ('[' + mojoDescriptor.getExecuteLifecycle() + ']'))
                         + mojoDescriptor.getExecutePhase() + "' forked phase execution";
             } else {
                 // forked goal
                 execution = "'" + mojoDescriptor.getExecuteGoal() + "' forked goal execution";
             }
 
             LOGGER.info("Preparing {} requires {}", reportDescription, execution);
 
             lifecycleExecutor.executeForkedExecutions(mojoExecution, mavenReportExecutorRequest.getMavenSession());
 
             LOGGER.info("{} for {} preparation done", execution, reportDescription);
         }
 
         return mavenReportExecution;
     }
 
     private boolean canAggregate(MavenProject project) {
         return project.isExecutionRoot()
                 && "pom".equals(project.getPackaging())
                 && (project.getModules() != null)
                 && !project.getModules().isEmpty();
     }
 
     private MavenReport getConfiguredMavenReport(
             MojoExecution mojoExecution,
             PluginDescriptor pluginDescriptor,
             MavenReportExecutorRequest mavenReportExecutorRequest)
             throws PluginContainerException, PluginConfigurationException {
         try {
             Mojo mojo = mavenPluginManager.getConfiguredMojo(
                     Mojo.class, mavenReportExecutorRequest.getMavenSession(), mojoExecution);
 
             return (MavenReport) mojo;
         } catch (ClassCastException e) {
             if (LOGGER.isDebugEnabled()) {
                 LOGGER.warn("Skipping ClassCastException", e);
             } else {
                 LOGGER.warn("Skipping ClassCastException");
             }
             return null;
         }
     }
 
     private boolean isMavenReport(MojoExecution mojoExecution, PluginDescriptor pluginDescriptor) {
         ClassLoader originalClassLoader = Thread.currentThread().getContextClassLoader();
 
         // get the plugin's goal Mojo class
         Class<?> mojoClass;
         try {
             Thread.currentThread()
                     .setContextClassLoader(mojoExecution.getMojoDescriptor().getRealm());
 
             mojoClass = pluginDescriptor
                     .getClassRealm()
                     .loadClass(mojoExecution.getMojoDescriptor().getImplementation());
         } catch (ClassNotFoundException e) {
             if (LOGGER.isDebugEnabled()) {
                 LOGGER.warn("Skipping ClassNotFoundException mojoExecution.goal {}", mojoExecution.getGoal(), e);
             } else {
                 LOGGER.warn("Skipping ClassNotFoundException mojoExecution.goal {}", mojoExecution.getGoal());
             }
             return false;
         } finally {
             Thread.currentThread().setContextClassLoader(originalClassLoader);
         }
 
         // check if it is a report
         try {
             Thread.currentThread()
                     .setContextClassLoader(mojoExecution.getMojoDescriptor().getRealm());
             MojoDescriptor mojoDescriptor = pluginDescriptor.getMojo(mojoExecution.getGoal());
 
             boolean isMavenReport = MavenReport.class.isAssignableFrom(mojoClass);
 
             if (LOGGER.isDebugEnabled()) {
                 if (mojoDescriptor != null && mojoDescriptor.getImplementationClass() != null) {
                     LOGGER.debug(
                             "Class {} is MavenReport: ",
                             mojoDescriptor.getImplementationClass().getName(),
                             isMavenReport);
                 }
 
                 if (!isMavenReport) {
                     LOGGER.debug(
                             "Skipping non MavenReport {}",
                             mojoExecution.getMojoDescriptor().getId());
                 }
             }
 
             return isMavenReport;
         } catch (LinkageError e) {
             if (LOGGER.isDebugEnabled()) {
                 LOGGER.warn("Skipping LinkageError mojoExecution.goal {}", mojoExecution.getGoal(), e);
             } else {
                 LOGGER.warn("Skipping LinkageError mojoExecution.goal {}", mojoExecution.getGoal());
             }
             return false;
         } finally {
             Thread.currentThread().setContextClassLoader(originalClassLoader);
         }
     }
 
     /**
      * Merge plugin configuration and reportset configuration to mojo configuration to get effective
      * mojo configuration.
      *
      * @param mojoConf configuration done at mojo descriptor level
      * @param pluginMgmtConfig configuration done at build.pluginManagement level
      * @param pluginConf configuration done at reporting plugin level
      * @param reportSetConf configuration done at reportSet level
      * @param parameters set of supported parameters: any other parameter will be removed
      * @return the effective configuration to be used
      */
     private Xpp3Dom mergeConfiguration(
             PlexusConfiguration mojoConf,
             Xpp3Dom pluginMgmtConfig,
             PlexusConfiguration pluginConf,
             PlexusConfiguration reportSetConf,
             Set<String> parameters) {
         Xpp3Dom mojoConfig = (mojoConf != null) ? convert(mojoConf) : new Xpp3Dom("configuration");
 
         if (pluginMgmtConfig != null || pluginConf != null || reportSetConf != null) {
             Xpp3Dom pluginConfig = (pluginConf == null) ? new Xpp3Dom("fake") : convert(pluginConf);
 
             // merge pluginConf into reportSetConf
             Xpp3Dom mergedConfig = Xpp3DomUtils.mergeXpp3Dom(convert(reportSetConf), pluginConfig);
             // then merge pluginMgmtConfig
             mergedConfig = Xpp3DomUtils.mergeXpp3Dom(mergedConfig, pluginMgmtConfig);
             // then merge mojoConf
             mergedConfig = Xpp3DomUtils.mergeXpp3Dom(mergedConfig, mojoConfig);
 
             // clean result
             Xpp3Dom cleanedConfig = new Xpp3Dom("configuration");
             if (mergedConfig.getChildren() != null) {
                 for (Xpp3Dom parameter : mergedConfig.getChildren()) {
                     if (parameters.contains(parameter.getName())) {
                         cleanedConfig.addChild(parameter);
                     }
                 }
             }
 
             mojoConfig = cleanedConfig;
         }
 
         return mojoConfig;
     }
 
     private Xpp3Dom convert(PlexusConfiguration config) {
         if (config == null) {
             return null;
         }
 
         Xpp3Dom dom = new Xpp3Dom(config.getName());
         dom.setValue(config.getValue(null));
 
         for (String attrib : config.getAttributeNames()) {
             dom.setAttribute(attrib, config.getAttribute(attrib, null));
         }
 
         for (int n = config.getChildCount(), i = 0; i < n; i++) {
             dom.addChild(convert(config.getChild(i)));
         }
 
         return dom;
     }
 
     /**
      * Resolve report plugin version. Steps to find a plugin version stop after each step if a non <code>null</code>
      * value has been found:
      * <ol>
      * <li>use the one defined in the reportPlugin configuration,</li>
      * <li>search similar (same groupId and artifactId) mojo in the build/plugins section of the pom,</li>
      * <li>search similar (same groupId and artifactId) mojo in the build/pluginManagement section of the pom,</li>
      * <li>ask {@link PluginVersionResolver} to get a fallback version and display a warning as it's not a recommended
      * use.</li>
      * </ol>
      *
      * @param reportPlugin the report plugin to resolve the version
      * @param mavenReportExecutorRequest the current report execution context
      * @return the report plugin version
      * @throws PluginVersionResolutionException on plugin version resolution issue
      */
     protected String resolvePluginVersion(
             ReportPlugin reportPlugin, MavenReportExecutorRequest mavenReportExecutorRequest)
             throws PluginVersionResolutionException {
         String reportPluginKey = reportPlugin.getGroupId() + ':' + reportPlugin.getArtifactId();
         LOGGER.debug("Resolving version for {}", reportPluginKey);
 
         // look for version defined in the reportPlugin configuration
         if (reportPlugin.getVersion() != null) {
             LOGGER.debug(
                     "Resolved {} version from the reporting.plugins section: {}",
                     reportPluginKey,
                     reportPlugin.getVersion());
             return reportPlugin.getVersion();
         }
 
         MavenProject project = mavenReportExecutorRequest.getProject();
 
         // search in the build section
         if (project.getBuild() != null) {
             Plugin plugin = find(reportPlugin, project.getBuild().getPlugins());
 
             if (plugin != null && plugin.getVersion() != null) {
                 LOGGER.debug(
                         "Resolved {} version from the build.plugins section: {}", reportPluginKey, plugin.getVersion());
                 return plugin.getVersion();
             }
         }
 
         // search in pluginManagement section
         if (project.getBuild() != null && project.getBuild().getPluginManagement() != null) {
             Plugin plugin =
                     find(reportPlugin, project.getBuild().getPluginManagement().getPlugins());
 
             if (plugin != null && plugin.getVersion() != null) {
                 LOGGER.debug(
                         "Resolved {} version from the build.pluginManagement.plugins section: {}",
                         reportPluginKey,
                         plugin.getVersion());
                 return plugin.getVersion();
             }
         }
 
         LOGGER.warn("Report plugin {} has an empty version.", reportPluginKey);
         LOGGER.warn("");
         LOGGER.warn("It is highly recommended to fix these problems"
                 + " because they threaten the stability of your build.");
         LOGGER.warn("");
         LOGGER.warn("For this reason, future Maven versions might no"
                 + " longer support building such malformed projects.");
 
         Plugin plugin = new Plugin();
         plugin.setGroupId(reportPlugin.getGroupId());
         plugin.setArtifactId(reportPlugin.getArtifactId());
 
         PluginVersionRequest pluginVersionRequest =
                 new DefaultPluginVersionRequest(plugin, mavenReportExecutorRequest.getMavenSession());
 
         PluginVersionResult result = pluginVersionResolver.resolve(pluginVersionRequest);
         LOGGER.debug("Resolved {} version from repository: {}", reportPluginKey, result.getVersion());
         return result.getVersion();
     }
 
     /**
      * Search similar (same groupId and artifactId) plugin as a given report plugin.
      *
      * @param reportPlugin the report plugin to search for a similar plugin
      * @param plugins the candidate plugins
      * @return the first similar plugin
      */
     private Plugin find(ReportPlugin reportPlugin, List<Plugin> plugins) {
         if (plugins == null) {
             return null;
         }
         for (Plugin plugin : plugins) {
             if (Objects.equals(plugin.getArtifactId(), reportPlugin.getArtifactId())
                     && Objects.equals(plugin.getGroupId(), reportPlugin.getGroupId())) {
                 return plugin;
             }
         }
         return null;
     }
 
     /**
      * TODO other stuff to merge ?
      * <p>
      * this method will "merge" some part of the plugin declaration existing in the build section to the fake plugin
      * build for report execution:
      * <ul>
      * <li>dependencies</li>
      * </ul>
      * </p>
      * The plugin could only be present in the dependency management section.
      *
      * @param mavenReportExecutorRequest
      * @param buildPlugin
      * @param reportPlugin
      */
     private void mergePluginToReportPlugin(
             MavenReportExecutorRequest mavenReportExecutorRequest, Plugin buildPlugin, ReportPlugin reportPlugin) {
         Build build = mavenReportExecutorRequest.getProject().getBuild();
         Plugin configuredPlugin = find(reportPlugin, build.getPlugins());
         if (configuredPlugin == null && build.getPluginManagement() != null) {
             configuredPlugin = find(reportPlugin, build.getPluginManagement().getPlugins());
         }
         if (configuredPlugin != null) {
             if (!configuredPlugin.getDependencies().isEmpty()) {
                 buildPlugin.getDependencies().addAll(configuredPlugin.getDependencies());
             }
         }
     }
 
     private static class GoalWithConf {
         private final String goal;
 
         private final PlexusConfiguration configuration;
 
         private final ReportPlugin reportPlugin;
 
         private final PluginDescriptor pluginDescriptor;
 
         GoalWithConf(
                 ReportPlugin reportPlugin,
                 PluginDescriptor pluginDescriptor,
                 String goal,
                 PlexusConfiguration configuration) {
             this.reportPlugin = reportPlugin;
             this.pluginDescriptor = pluginDescriptor;
             this.goal = goal;
             this.configuration = configuration;
         }
 
         public ReportPlugin getReportPlugin() {
             return reportPlugin;
         }
 
         public PluginDescriptor getPluginDescriptor() {
             return pluginDescriptor;
         }
 
         public String getGoal() {
             return goal;
         }
 
         public PlexusConfiguration getConfiguration() {
             return configuration;
         }
     }
 }