/*
    * 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 java.util.ArrayList;
  import java.util.Collections;
  import java.util.Comparator;
  import java.util.List;
  import java.util.Locale;
  
  import org.apache.maven.artifact.Artifact;
  import org.apache.maven.artifact.versioning.VersionRange;
  import org.apache.maven.doxia.sink.Sink;
  import org.apache.maven.model.Plugin;
  import org.apache.maven.model.ReportPlugin;
  import org.apache.maven.plugin.logging.Log;
  import org.apache.maven.plugins.annotations.Mojo;
  import org.apache.maven.plugins.annotations.ResolutionScope;
  import org.apache.maven.project.DefaultProjectBuildingRequest;
  import org.apache.maven.project.MavenProject;
  import org.apache.maven.project.ProjectBuilder;
  import org.apache.maven.project.ProjectBuildingException;
  import org.apache.maven.project.ProjectBuildingRequest;
  import org.apache.maven.reporting.MavenReportException;
  import org.apache.maven.repository.RepositorySystem;
  import org.codehaus.plexus.i18n.I18N;
  import org.codehaus.plexus.util.StringUtils;
  
  /**
   * Generates the Project Plugins report.
   *
   * @author <a href="mailto:vincent.siveton@gmail.com">Vincent Siveton</a>
   * @since 2.1
   */
  @Mojo(name = "plugins", requiresDependencyResolution = ResolutionScope.TEST)
  public class PluginsReport extends AbstractProjectInfoReport {
      // ----------------------------------------------------------------------
      // Public methods
      // ----------------------------------------------------------------------
  
      @Override
      public boolean canGenerateReport() throws MavenReportException {
          boolean result = super.canGenerateReport();
          if (result && skipEmptyReport) {
              result = !isEmpty(getProject().getBuildPlugins())
                      || !isEmpty(getProject().getReportPlugins());
          }
  
          return result;
      }
  
      @Override
      public void executeReport(Locale locale) {
          PluginsRenderer r = new PluginsRenderer(
                  getLog(),
                  getSink(),
                  locale,
                  getI18N(locale),
                  project.getBuildPlugins(),
                  project.getReportPlugins(),
                  project,
                  projectBuilder,
                  repositorySystem,
                  getSession().getProjectBuildingRequest());
          r.render();
      }
  
      /** {@inheritDoc} */
      public String getOutputName() {
          return "plugins";
      }
  
      @Override
      protected String getI18Nsection() {
          return "plugins";
      }
  
      // ----------------------------------------------------------------------
      // Private
      // ----------------------------------------------------------------------
  
      /**
       * Internal renderer class
      */
     protected static class PluginsRenderer extends AbstractProjectInfoRenderer {
         private final Log log;
 
         private final List<Plugin> plugins;
 
         private final List<ReportPlugin> reports;
 
         private final MavenProject project;
 
         private final ProjectBuilder projectBuilder;
 
         private final RepositorySystem repositorySystem;
 
         private final ProjectBuildingRequest buildingRequest;
 
         /**
          * @param log {@link #log}
          * @param sink {@link Sink}
          * @param locale {@link Locale}
          * @param i18n {@link I18N}
          * @param plugins {@link Artifact}
          * @param reports {@link Artifact}
          * @param project {@link MavenProject}
          * @param projectBuilder {@link ProjectBuilder}
          * @param repositorySystem {@link RepositorySystem}
          * @param buildingRequest {@link ProjectBuildingRequest}
          *
          */
         public PluginsRenderer(
                 Log log,
                 Sink sink,
                 Locale locale,
                 I18N i18n,
                 List<Plugin> plugins,
                 List<ReportPlugin> reports,
                 MavenProject project,
                 ProjectBuilder projectBuilder,
                 RepositorySystem repositorySystem,
                 ProjectBuildingRequest buildingRequest) {
             super(sink, i18n, locale);
 
             this.log = log;
 
             this.plugins = new ArrayList<>(plugins);
 
             this.reports = new ArrayList<>(reports);
 
             this.project = project;
 
             this.projectBuilder = projectBuilder;
 
             this.repositorySystem = repositorySystem;
 
             this.buildingRequest = buildingRequest;
         }
 
         @Override
         protected String getI18Nsection() {
             return "plugins";
         }
 
         @Override
         protected void renderBody() {
             // === Section: Project Plugins.
             renderSectionPlugins(true);
 
             // === Section: Project Reports.
             renderSectionPlugins(false);
         }
 
         /**
          * @param isPlugins <code>true</code> to use <code>plugins</code> variable, <code>false</code> to use
          * <code>reports</code> variable.
          */
         private void renderSectionPlugins(boolean isPlugins) {
             List<GAV> list = isPlugins ? GAV.pluginsToGAV(plugins) : GAV.reportPluginsToGAV(reports, project);
 
             String[] tableHeader = getPluginTableHeader();
 
             startSection(getI18nString(isPlugins ? "build.title" : "report.title"));
 
             if (list.isEmpty()) {
 
                 paragraph(getI18nString(isPlugins ? "nolist" : "report.nolist"));
                 endSection();
                 return;
             }
 
             Collections.sort(list, getPluginComparator());
 
             startTable();
             tableHeader(tableHeader);
 
             ProjectBuildingRequest buildRequest = new DefaultProjectBuildingRequest(buildingRequest);
             buildRequest.setRemoteRepositories(project.getPluginArtifactRepositories());
             buildRequest.setProcessPlugins(false);
 
             for (GAV plugin : list) {
                 VersionRange versionRange = VersionRange.createFromVersion(plugin.getVersion());
 
                 Artifact pluginArtifact = repositorySystem.createProjectArtifact(
                         plugin.getGroupId(), plugin.getArtifactId(), versionRange.toString());
                 try {
                     MavenProject pluginProject =
                             projectBuilder.build(pluginArtifact, buildRequest).getProject();
 
                     tableRow(getPluginRow(
                             pluginProject.getGroupId(),
                             pluginProject.getArtifactId(),
                             pluginProject.getVersion(),
                             pluginProject.getUrl()));
                 } catch (ProjectBuildingException e) {
                     log.info("Could not build project for " + plugin.getArtifactId(), e);
                     tableRow(getPluginRow(plugin.getGroupId(), plugin.getArtifactId(), plugin.getVersion(), null));
                 }
             }
             endTable();
 
             endSection();
         }
 
         // ----------------------------------------------------------------------
         // Private methods
         // ----------------------------------------------------------------------
 
         private String[] getPluginTableHeader() {
             // reused key...
             String groupId = getI18nString("dependency-management", "column.groupId");
             String artifactId = getI18nString("dependency-management", "column.artifactId");
             String version = getI18nString("dependency-management", "column.version");
             return new String[] {groupId, artifactId, version};
         }
 
         private String[] getPluginRow(String groupId, String artifactId, String version, String link) {
             artifactId = ProjectInfoReportUtils.getArtifactIdCell(artifactId, link);
             return new String[] {groupId, artifactId, version};
         }
 
         private static class GAV {
             private final String groupId;
             private final String artifactId;
             private final String version;
 
             private GAV(Plugin plugin) {
                 groupId = plugin.getGroupId();
                 artifactId = plugin.getArtifactId();
                 version = StringUtils.isEmpty(plugin.getVersion()) ? Artifact.RELEASE_VERSION : plugin.getVersion();
             }
 
             private GAV(ReportPlugin reportPlugin, MavenProject project) {
                 groupId = reportPlugin.getGroupId();
                 artifactId = reportPlugin.getArtifactId();
                 version = resolveReportPluginVersion(reportPlugin, project);
             }
 
             public String getGroupId() {
                 return groupId;
             }
 
             public String getArtifactId() {
                 return artifactId;
             }
 
             public String getVersion() {
                 return version;
             }
 
             public static List<GAV> pluginsToGAV(List<Plugin> plugins) {
                 List<GAV> result = new ArrayList<>(plugins.size());
                 for (Plugin plugin : plugins) {
                     result.add(new GAV(plugin));
                 }
                 return result;
             }
 
             public static List<GAV> reportPluginsToGAV(List<ReportPlugin> reportPlugins, MavenProject project) {
                 List<GAV> result = new ArrayList<>(reportPlugins.size());
                 for (ReportPlugin reportPlugin : reportPlugins) {
                     result.add(new GAV(reportPlugin, project));
                 }
                 return result;
             }
         }
 
         private Comparator<GAV> getPluginComparator() {
             return new Comparator<GAV>() {
                 /** {@inheritDoc} */
                 public int compare(GAV a1, GAV a2) {
                     int result = a1.groupId.compareTo(a2.groupId);
                     if (result == 0) {
                         result = a1.artifactId.compareTo(a2.artifactId);
                     }
                     return result;
                 }
             };
         }
 
         /**
          * 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>default value is RELEASE.</li>
          * </ol>
          *
          * @param reportPlugin the report plugin to resolve the version
          * @param project the current project
          * @return the report plugin version
          */
         protected static String resolveReportPluginVersion(ReportPlugin reportPlugin, MavenProject project) {
             // look for version defined in the reportPlugin configuration
             if (reportPlugin.getVersion() != null) {
                 return reportPlugin.getVersion();
             }
 
             // search in the build section
             if (project.getBuild() != null) {
                 Plugin plugin = find(reportPlugin, project.getBuild().getPlugins());
 
                 if (plugin != null && plugin.getVersion() != null) {
                     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) {
                     return plugin.getVersion();
                 }
             }
 
             // empty version
             return Artifact.RELEASE_VERSION;
         }
 
         /**
          * 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 static Plugin find(ReportPlugin reportPlugin, List<Plugin> plugins) {
             if (plugins == null) {
                 return null;
             }
             for (Plugin plugin : plugins) {
                 if (StringUtils.equals(plugin.getArtifactId(), reportPlugin.getArtifactId())
                         && StringUtils.equals(plugin.getGroupId(), reportPlugin.getGroupId())) {
                     return plugin;
                 }
             }
             return null;
         }
     }
 }