/*
    * 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.plugins.changes;
  
  import javax.inject.Inject;
  
  import java.io.File;
  import java.io.IOException;
  import java.io.Writer;
  import java.net.URL;
  import java.nio.charset.StandardCharsets;
  import java.nio.file.Files;
  import java.nio.file.Path;
  import java.text.SimpleDateFormat;
  import java.util.Collections;
  import java.util.Date;
  import java.util.List;
  import java.util.Locale;
  import java.util.Map;
  import java.util.Map.Entry;
  import java.util.Properties;
  import java.util.ResourceBundle;
  
  import org.apache.commons.collections4.map.CaseInsensitiveMap;
  import org.apache.commons.io.input.XmlStreamReader;
  import org.apache.maven.plugins.annotations.Mojo;
  import org.apache.maven.plugins.annotations.Parameter;
  import org.apache.maven.plugins.changes.model.Release;
  import org.apache.maven.project.MavenProject;
  import org.apache.maven.reporting.MavenReportException;
  import org.apache.maven.shared.filtering.MavenFileFilter;
  import org.apache.maven.shared.filtering.MavenFileFilterRequest;
  import org.apache.maven.shared.filtering.MavenFilteringException;
  import org.codehaus.plexus.util.FileUtils;
  
  /**
   * Goal which creates a nicely formatted Changes Report in html format from a changes.xml file.
   *
   * @author <a href="mailto:jruiz@exist.com">Johnny R. Ruiz III</a>
   * @since 2.0
   */
  @Mojo(name = "changes", threadSafe = true)
  public class ChangesReport extends AbstractChangesReport {
      /**
       * A flag whether the report should also include changes from child modules. If set to <code>false</code>, only the
       * changes from current project will be written to the report.
       *
       * @since 2.5
       */
      @Parameter(defaultValue = "false")
      private boolean aggregated;
  
      /**
       * A flag whether the report should also include the dates of individual actions. If set to <code>false</code>, only
       * the dates of releases will be written to the report.
       *
       * @since 2.1
       */
      @Parameter(property = "changes.addActionDate", defaultValue = "false")
      private boolean addActionDate;
  
      /**
       * The directory for interpolated changes.xml.
       *
       * @since 2.2
       */
      @Parameter(defaultValue = "${project.build.directory}/changes", required = true, readonly = true)
      private File filteredOutputDirectory;
  
      /**
       * applying filtering filtering "a la" resources plugin
       *
       * @since 2.2
       */
      @Parameter(defaultValue = "false")
      private boolean filteringChanges;
  
      /**
       * Template strings per system that is used to discover the URL to use to display an issue report. Each key in this
       * map denotes the (case-insensitive) identifier of the issue tracking system and its value gives the URL template.
       * <p>
       * There are 2 template tokens you can use. <code>%URL%</code>: this is computed by getting the
       * <code>&lt;issueManagement&gt;/&lt;url&gt;</code> value from the POM, and removing the last '/' and everything
      * that comes after it. <code>%ISSUE%</code>: this is the issue number.
      * </p>
      * <p>
      * <strong>Note:</strong> The deprecated issueLinkTemplate will be used for a system called "default".
      * </p>
      * <p>
      * <strong>Note:</strong> Starting with version 2.4 you usually don't need to specify this, unless you need to link
      * to an issue management system in your Changes report that isn't supported out of the box. See the
      * <a href="./usage.html">Usage page</a> for more information.
      * </p>
      *
      * @since 2.1
      */
     @Parameter
     private Map<String, String> issueLinkTemplatePerSystem;
 
     /**
      * Format to use for publishDate. The value will be available with the following expression ${publishDate}
      *
      * @see java.text.SimpleDateFormat
      * @since 2.2
      */
     @Parameter(defaultValue = "yyyy-MM-dd")
     private String publishDateFormat;
 
     /**
      * Locale to use for publishDate when formatting
      *
      * @see java.util.Locale
      * @since 2.2
      */
     @Parameter(defaultValue = "en")
     private String publishDateLocale;
 
     /**
      * @since 2.4
      */
     @Parameter(defaultValue = "${project.issueManagement.system}", readonly = true)
     private String system;
 
     /**
      * The URI of a file containing all the team members. If this is set to the special value "none", no links will be
      * generated for the team members.
      *
      * @since 2.4
      */
     @Parameter(defaultValue = "team.html")
     private String team;
 
     @Parameter(defaultValue = "${project.issueManagement.url}", readonly = true)
     private String url;
 
     /**
      * The type of the feed to generate.
      * <p>
      * Supported values are: <code>"rss_0.9", "rss_0.91N" (RSS 0.91 Netscape), "rss_0.91U" (RSS 0.91 Userland),
      * "rss_0.92", "rss_0.93", "rss_0.94", "rss_1.0", "rss_2.0", "atom_0.3", "atom_1.0"</code>.
      * </p>
      * <p>
      * If not specified, no feed is generated.
      * </p>
      *
      * @since 2.9
      */
     @Parameter
     private String feedType;
 
     /**
      * The path of the <code>changes.xml</code> file that will be converted into an HTML report.
      */
     @Parameter(property = "changes.xmlPath", defaultValue = "src/changes/changes.xml")
     private File xmlPath;
 
     private final MavenFileFilter mavenFileFilter;
 
     @Inject
     public ChangesReport(MavenFileFilter mavenFileFilter) {
         this.mavenFileFilter = mavenFileFilter;
     }
 
     /* --------------------------------------------------------------------- */
     /* Public methods */
     /* --------------------------------------------------------------------- */
 
     @Override
     public boolean canGenerateReport() {
         // Run only at the execution root
         if (runOnlyAtExecutionRoot && !isThisTheExecutionRoot()) {
             getLog().info("Skipping the Changes Report in this project because it's not the Execution Root");
             return false;
         }
         return xmlPath.isFile();
     }
 
     @Override
     public void executeReport(Locale locale) throws MavenReportException {
         Date now = new Date();
         SimpleDateFormat simpleDateFormat = new SimpleDateFormat(publishDateFormat, new Locale(publishDateLocale));
         Properties additionalProperties = new Properties();
         additionalProperties.put("publishDate", simpleDateFormat.format(now));
 
         ChangesXML changesXml = getChangesFromFile(xmlPath, project, additionalProperties);
         if (changesXml == null) {
             return;
         }
 
         if (aggregated) {
             final String basePath = project.getBasedir().getAbsolutePath();
             final String absolutePath = xmlPath.getAbsolutePath();
             if (!absolutePath.startsWith(basePath)) {
                 getLog().warn("xmlPath should be within the project dir for aggregated changes report.");
                 return;
             }
             final String relativePath = absolutePath.substring(basePath.length());
 
             List<Release> releaseList = changesXml.getReleaseList();
             for (MavenProject childProject : project.getCollectedProjects()) {
                 final File changesFile = new File(childProject.getBasedir(), relativePath);
                 final ChangesXML childXml = getChangesFromFile(changesFile, childProject, additionalProperties);
                 if (childXml != null) {
                     releaseList =
                             ReleaseUtils.mergeReleases(releaseList, childProject.getName(), childXml.getReleaseList());
                 }
             }
             changesXml.setReleaseList(releaseList);
         }
 
         ChangesReportRenderer report = new ChangesReportRenderer(getSink(), getBundle(locale), changesXml);
 
         report.setIssueLinksPerSystem(prepareIssueLinksPerSystem());
         report.setSystem(system);
         report.setTeam(team);
         report.setUrl(url);
         report.setAddActionDate(addActionDate);
 
         if (url == null || url.isEmpty()) {
             getLog().warn("No issue management URL defined in POM. Links to your issues will not work correctly.");
         }
 
         boolean feedGenerated = false;
 
         if (feedType != null && !feedType.isEmpty()) {
             feedGenerated = generateFeed(changesXml, locale);
         }
 
         report.setLinkToFeed(feedGenerated);
 
         report.render();
 
         // Copy the images
         copyStaticResources();
     }
 
     private Map<String, String> prepareIssueLinksPerSystem() {
         Map<String, String> issueLinkTemplate;
         // Create a case insensitive version of issueLinkTemplatePerSystem
         // We need something case insensitive to maintain backward compatibility
         if (this.issueLinkTemplatePerSystem == null) {
             issueLinkTemplate = new CaseInsensitiveMap<>();
         } else {
             issueLinkTemplate = new CaseInsensitiveMap<>(this.issueLinkTemplatePerSystem);
         }
 
         // Set good default values for issue management systems here
         issueLinkTemplate.computeIfAbsent(
                 ChangesReportRenderer.DEFAULT_ISSUE_SYSTEM_KEY, k -> "%URL%/ViewIssue.jspa?key=%ISSUE%");
         issueLinkTemplate.computeIfAbsent("Bitbucket", k -> "%URL%/issue/%ISSUE%");
         issueLinkTemplate.computeIfAbsent("Bugzilla", k -> "%URL%/show_bug.cgi?id=%ISSUE%");
         issueLinkTemplate.computeIfAbsent("GitHub", k -> "%URL%/%ISSUE%");
         issueLinkTemplate.computeIfAbsent("GoogleCode", k -> "%URL%/detail?id=%ISSUE%");
         issueLinkTemplate.computeIfAbsent("JIRA", k -> "%URL%/%ISSUE%");
         issueLinkTemplate.computeIfAbsent("Mantis", k -> "%URL%/view.php?id=%ISSUE%");
         issueLinkTemplate.computeIfAbsent("MKS", k -> "%URL%/viewissue?selection=%ISSUE%");
         issueLinkTemplate.computeIfAbsent("Redmine", k -> "%URL%/issues/show/%ISSUE%");
         issueLinkTemplate.computeIfAbsent("Scarab", k -> "%URL%/issues/id/%ISSUE%");
         issueLinkTemplate.computeIfAbsent("SourceForge", k -> "http://sourceforge.net/support/tracker.php?aid=%ISSUE%");
         issueLinkTemplate.computeIfAbsent("SourceForge2", k -> "%URL%/%ISSUE%");
         issueLinkTemplate.computeIfAbsent("Trac", k -> "%URL%/ticket/%ISSUE%");
         issueLinkTemplate.computeIfAbsent("Trackplus", k -> "%URL%/printItem.action?key=%ISSUE%");
         issueLinkTemplate.computeIfAbsent("Tuleap", k -> "%URL%/?aid=%ISSUE%");
         issueLinkTemplate.computeIfAbsent("YouTrack", k -> "%URL%/issue/%ISSUE%");
         // @todo Add more issue management systems here
         // Remember to also add documentation in usage.apt.vm
 
         // Show the current issueLinkTemplatePerSystem configuration
         logIssueLinkTemplatePerSystem(issueLinkTemplate);
         return issueLinkTemplate;
     }
 
     @Override
     public String getDescription(Locale locale) {
         return getBundle(locale).getString("report.issues.description");
     }
 
     @Override
     public String getName(Locale locale) {
         return getBundle(locale).getString("report.issues.name");
     }
 
     @Override
     @Deprecated
     public String getOutputName() {
         return "changes";
     }
 
     /* --------------------------------------------------------------------- */
     /* Private methods */
     /* --------------------------------------------------------------------- */
 
     /**
      * Parses specified changes.xml file. It also makes filtering if needed. If specified file doesn't exist it will log
      * warning and return <code>null</code>.
      *
      * @param changesXml changes xml file to parse
      * @param project maven project to parse changes for
      * @param additionalProperties additional properties used for filtering
      * @return parsed <code>ChangesXML</code> instance or null if file doesn't exist
      * @throws MavenReportException if any errors occurs while parsing
      */
     private ChangesXML getChangesFromFile(File changesXml, MavenProject project, Properties additionalProperties)
             throws MavenReportException {
         if (!changesXml.exists()) {
             getLog().warn("changes.xml file " + changesXml.getAbsolutePath() + " does not exist.");
             return null;
         }
 
         if (filteringChanges) {
             if (!filteredOutputDirectory.exists()) {
                 filteredOutputDirectory.mkdirs();
             }
             try {
                 // so we get encoding from the file itself
                 try (XmlStreamReader xmlStreamReader =
                         XmlStreamReader.builder().setFile(changesXml).get()) {
                     String encoding = xmlStreamReader.getEncoding();
                     File resultFile = new File(
                             filteredOutputDirectory,
                             project.getGroupId() + "." + project.getArtifactId() + "-changes.xml");
 
                     final MavenFileFilterRequest mavenFileFilterRequest = new MavenFileFilterRequest(
                             changesXml,
                             resultFile,
                             true,
                             project,
                             Collections.emptyList(),
                             false,
                             encoding,
                             mavenSession,
                             additionalProperties);
                     mavenFileFilter.copyFile(mavenFileFilterRequest);
                     changesXml = resultFile;
                 }
             } catch (IOException | MavenFilteringException e) {
                 throw new MavenReportException("Exception during filtering changes file : " + e.getMessage(), e);
             }
         }
         return new ChangesXML(changesXml, getLog());
     }
 
     private void copyStaticResources() throws MavenReportException {
         final String pluginResourcesBase = "org/apache/maven/plugins/changes";
         String[] resourceNames = {
             "images/add.gif",
             "images/fix.gif",
             "images/icon_help_sml.gif",
             "images/remove.gif",
             "images/rss.png",
             "images/update.gif"
         };
         try {
             getLog().debug("Copying static resources.");
             for (String resourceName : resourceNames) {
                 URL url = this.getClass().getClassLoader().getResource(pluginResourcesBase + "/" + resourceName);
                 FileUtils.copyURLToFile(url, new File(getReportOutputDirectory(), resourceName));
             }
         } catch (IOException e) {
             throw new MavenReportException("Unable to copy static resources.");
         }
     }
 
     private ResourceBundle getBundle(Locale locale) {
         return ResourceBundle.getBundle(
                 "changes-report", locale, this.getClass().getClassLoader());
     }
 
     private void logIssueLinkTemplatePerSystem(Map<String, String> issueLinkTemplatePerSystem) {
         if (getLog().isDebugEnabled()) {
             for (Entry<String, String> entry : issueLinkTemplatePerSystem.entrySet()) {
                 getLog().debug("issueLinkTemplatePerSystem[" + entry.getKey() + "] = " + entry.getValue());
             }
         }
     }
 
     private boolean generateFeed(final ChangesXML changesXml, final Locale locale) {
         getLog().debug("Generating " + feedType + " feed.");
 
         boolean success = true;
 
         final FeedGenerator feed = new FeedGenerator(locale);
         feed.setLink(project.getUrl() + "/changes-report.html"); // TODO: better way?
         feed.setTitle(project.getName() + ": " + changesXml.getTitle());
         feed.setAuthor(changesXml.getAuthor());
         feed.setDateFormat(new SimpleDateFormat(publishDateFormat, new Locale(publishDateLocale)));
 
         Path changes = getReportOutputDirectory().toPath().resolve("changes.rss");
         try (Writer writer = Files.newBufferedWriter(changes, StandardCharsets.UTF_8)) {
             feed.export(changesXml.getReleaseList(), feedType, writer);
         } catch (IOException ex) {
             success = false;
             getLog().warn("Failed to create RSS feed: " + ex.getMessage());
             getLog().debug(ex);
         }
 
         return success;
     }
 }