/*
    * 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.pmd;
  
  import java.io.File;
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.List;
  import java.util.Locale;
  
  import net.sourceforge.pmd.renderers.Renderer;
  import org.apache.maven.model.Dependency;
  import org.apache.maven.plugins.annotations.Component;
  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.plugins.pmd.exec.PmdExecutor;
  import org.apache.maven.plugins.pmd.exec.PmdRequest;
  import org.apache.maven.plugins.pmd.exec.PmdResult;
  import org.apache.maven.project.DefaultProjectBuildingRequest;
  import org.apache.maven.project.MavenProject;
  import org.apache.maven.project.ProjectBuildingRequest;
  import org.apache.maven.reporting.MavenReportException;
  import org.apache.maven.shared.artifact.filter.resolve.AndFilter;
  import org.apache.maven.shared.artifact.filter.resolve.ExclusionsFilter;
  import org.apache.maven.shared.artifact.filter.resolve.ScopeFilter;
  import org.apache.maven.shared.artifact.filter.resolve.TransformableFilter;
  import org.apache.maven.shared.transfer.artifact.resolve.ArtifactResult;
  import org.apache.maven.shared.transfer.dependencies.resolve.DependencyResolver;
  import org.apache.maven.toolchain.Toolchain;
  import org.codehaus.plexus.i18n.I18N;
  import org.codehaus.plexus.resource.ResourceManager;
  import org.codehaus.plexus.resource.loader.FileResourceCreationException;
  import org.codehaus.plexus.resource.loader.FileResourceLoader;
  import org.codehaus.plexus.resource.loader.ResourceNotFoundException;
  import org.codehaus.plexus.util.StringUtils;
  
  /**
   * Creates a PMD site report based on the rulesets and configuration set in the plugin.
   * It can also generate a pmd output file aside from the site report in any of the following formats: xml, csv or txt.
   *
   * @author Brett Porter
   * @version $Id$
   * @since 2.0
   */
  @Mojo(name = "pmd", threadSafe = true, requiresDependencyResolution = ResolutionScope.TEST)
  public class PmdReport extends AbstractPmdReport {
      /**
       * The target JDK to analyze based on. Should match the source used in the compiler plugin.
       * Valid values depend on the used PMD version. Most common values are
       * <code>8</code>, <code>11</code>, <code>17</code>, and <code>21</code>.
       *
       * <p>The full list of supported Java versions for each PMD version is available at
       * <a href="https://docs.pmd-code.org/latest/pmd_languages_java.html">Java support (PMD)</a>.</p>
       *
       * <p>You can override the default PMD version by specifying PMD as a dependency,
       * see <a href="examples/upgrading-PMD-at-runtime.html">Upgrading PMD at Runtime</a>.</p>
       *
       * <p>
       *   <b>Note:</b> this parameter is only used if the language parameter is set to <code>java</code>.
       * </p>
       */
      @Parameter(property = "targetJdk", defaultValue = "${maven.compiler.source}")
      private String targetJdk;
  
      /**
       * The programming language to be analyzed by PMD. Valid values are currently <code>java</code>,
       * <code>javascript</code> and <code>jsp</code>.
       *
       * @since 3.0
       */
      @Parameter(defaultValue = "java")
      private String language;
  
      /**
       * The rule priority threshold; rules with lower priority than this will not be evaluated.
       *
       * @since 2.1
       */
      @Parameter(property = "minimumPriority", defaultValue = "5")
      private int minimumPriority = 5;
  
     /**
      * Skip the PMD report generation. Most useful on the command line via "-Dpmd.skip=true".
      *
      * @since 2.1
      */
     @Parameter(property = "pmd.skip", defaultValue = "false")
     private boolean skip;
 
     /**
      * The PMD rulesets to use. See the
      * <a href="https://pmd.github.io/latest/pmd_rules_java.html">Stock Java Rulesets</a> for a
      * list of available rules.
      * Defaults to a custom ruleset provided by this maven plugin
      * (<code>/rulesets/java/maven-pmd-plugin-default.xml</code>).
      */
     @Parameter
     String[] rulesets = new String[] {"/rulesets/java/maven-pmd-plugin-default.xml"};
 
     /**
      * Controls whether the project's compile/test classpath should be passed to PMD to enable its type resolution
      * feature.
      *
      * @since 3.0
      */
     @Parameter(property = "pmd.typeResolution", defaultValue = "true")
     private boolean typeResolution;
 
     /**
      * Controls whether PMD will track benchmark information.
      *
      * @since 3.1
      */
     @Parameter(property = "pmd.benchmark", defaultValue = "false")
     private boolean benchmark;
 
     /**
      * Benchmark output filename.
      *
      * @since 3.1
      */
     @Parameter(property = "pmd.benchmarkOutputFilename", defaultValue = "${project.build.directory}/pmd-benchmark.txt")
     private String benchmarkOutputFilename;
 
     /**
      * Source level marker used to indicate whether a RuleViolation should be suppressed. If it is not set, PMD's
      * default will be used, which is <code>NOPMD</code>. See also <a
      * href="https://pmd.github.io/latest/pmd_userdocs_suppressing_warnings.html">PMD &#x2013; Suppressing warnings</a>.
      *
      * @since 3.4
      */
     @Parameter(property = "pmd.suppressMarker")
     private String suppressMarker;
 
     /**
      * per default pmd executions error are ignored to not break the whole
      *
      * @since 3.1
      */
     @Parameter(property = "pmd.skipPmdError", defaultValue = "true")
     private boolean skipPmdError;
 
     /**
      * Enables the analysis cache, which speeds up PMD. This
      * requires a cache file, that contains the results of the last
      * PMD run. Thus the cache is only effective, if this file is
      * not cleaned between runs.
      *
      * @since 3.8
      */
     @Parameter(property = "pmd.analysisCache", defaultValue = "false")
     private boolean analysisCache;
 
     /**
      * The location of the analysis cache, if it is enabled.
      * This file contains the results of the last PMD run and must not be cleaned
      * between consecutive PMD runs. Otherwise the cache is not in use.
      * If the file doesn't exist, PMD executes as if there is no cache enabled and
      * all files are analyzed. Otherwise only changed files will be analyzed again.
      *
      * @since 3.8
      */
     @Parameter(property = "pmd.analysisCacheLocation", defaultValue = "${project.build.directory}/pmd/pmd.cache")
     private String analysisCacheLocation;
 
     /**
      * Also render processing errors into the HTML report.
      * Processing errors are problems, that PMD encountered while executing the rules.
      * It can be parsing errors or exceptions during rule execution.
      * Processing errors indicate a bug in PMD and the information provided help in
      * reporting and fixing bugs in PMD.
      *
      * @since 3.9.0
      */
     @Parameter(property = "pmd.renderProcessingErrors", defaultValue = "true")
     private boolean renderProcessingErrors = true;
 
     /**
      * Also render the rule priority into the HTML report.
      *
      * @since 3.10.0
      */
     @Parameter(property = "pmd.renderRuleViolationPriority", defaultValue = "true")
     private boolean renderRuleViolationPriority = true;
 
     /**
      * Add a section in the HTML report, that groups the found violations by rule priority
      * in addition to grouping by file.
      *
      * @since 3.12.0
      */
     @Parameter(property = "pmd.renderViolationsByPriority", defaultValue = "true")
     private boolean renderViolationsByPriority = true;
 
     /**
      * Add a section in the HTML report that lists the suppressed violations.
      *
      * @since 3.17.0
      */
     @Parameter(property = "pmd.renderSuppressedViolations", defaultValue = "true")
     private boolean renderSuppressedViolations = true;
 
     /**
      * Before PMD is executed, the configured rulesets are resolved and copied into this directory.
      * <p>Note: Before 3.13.0, this was by default ${project.build.directory}.
      *
      * @since 3.13.0
      */
     @Parameter(property = "pmd.rulesetsTargetDirectory", defaultValue = "${project.build.directory}/pmd/rulesets")
     private File rulesetsTargetDirectory;
 
     /**
      * Used to locate configured rulesets. The rulesets could be on the plugin
      * classpath or in the local project file system.
      */
     @Component
     private ResourceManager locator;
 
     @Component
     private DependencyResolver dependencyResolver;
 
     /**
      * Internationalization component
      */
     @Component
     private I18N i18n;
 
     /**
      * Contains the result of the last PMD execution.
      * It might be <code>null</code> which means, that PMD
      * has not been executed yet.
      */
     private PmdResult pmdResult;
 
     /** {@inheritDoc} */
     public String getName(Locale locale) {
         return getI18nString(locale, "name");
     }
 
     /** {@inheritDoc} */
     public String getDescription(Locale locale) {
         return getI18nString(locale, "description");
     }
 
     /**
      * @param locale The locale
      * @param key The key to search for
      * @return The text appropriate for the locale.
      */
     protected String getI18nString(Locale locale, String key) {
         return i18n.getString("pmd-report", locale, "report.pmd." + key);
     }
 
     /**
      * Configures the PMD rulesets to be used directly.
      * Note: Usually the rulesets are configured via the property.
      *
      * @param rulesets the PMD rulesets to be used.
      * @see #rulesets
      */
     public void setRulesets(String[] rulesets) {
         this.rulesets = Arrays.copyOf(rulesets, rulesets.length);
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public void executeReport(Locale locale) throws MavenReportException {
         ClassLoader origLoader = Thread.currentThread().getContextClassLoader();
         try {
             Thread.currentThread().setContextClassLoader(this.getClass().getClassLoader());
 
             PmdReportRenderer r = new PmdReportRenderer(
                     getLog(),
                     getSink(),
                     i18n,
                     locale,
                     filesToProcess,
                     pmdResult.getViolations(),
                     renderRuleViolationPriority,
                     renderViolationsByPriority,
                     isAggregator());
             if (renderSuppressedViolations) {
                 r.setSuppressedViolations(pmdResult.getSuppressedViolations());
             }
             if (renderProcessingErrors) {
                 r.setProcessingErrors(pmdResult.getErrors());
             }
 
             r.render();
         } finally {
             Thread.currentThread().setContextClassLoader(origLoader);
         }
     }
 
     @Override
     public boolean canGenerateReport() {
         if (skip) {
             getLog().info("Skipping PMD execution");
             return false;
         }
 
         boolean result = super.canGenerateReport();
         if (result) {
             try {
                 executePmd();
                 if (skipEmptyReport) {
                     result = pmdResult.hasViolations();
                     if (!result) {
                         getLog().debug("Skipping report since skipEmptyReport is true and "
                                 + "there are no PMD violations.");
                     }
                 }
             } catch (MavenReportException e) {
                 throw new RuntimeException(e);
             }
         }
         return result;
     }
 
     private void executePmd() throws MavenReportException {
         if (pmdResult != null) {
             // PMD has already been run
             getLog().debug("PMD has already been run - skipping redundant execution.");
             return;
         }
 
         try {
             filesToProcess = getFilesToProcess();
 
             if (filesToProcess.isEmpty() && !"java".equals(language)) {
                 getLog().warn("No files found to process. Did you add your additional source folders like javascript?"
                         + " (see also build-helper-maven-plugin)");
             }
         } catch (IOException e) {
             throw new MavenReportException("Can't get file list", e);
         }
 
         PmdRequest request = new PmdRequest();
         request.setLanguageAndVersion(language, targetJdk);
         request.setRulesets(resolveRulesets());
         request.setAuxClasspath(typeResolution ? determineAuxClasspath() : null);
         request.setSourceEncoding(getInputEncoding());
         request.addFiles(filesToProcess.keySet());
         request.setMinimumPriority(minimumPriority);
         request.setSuppressMarker(suppressMarker);
         request.setBenchmarkOutputLocation(benchmark ? benchmarkOutputFilename : null);
         request.setAnalysisCacheLocation(analysisCache ? analysisCacheLocation : null);
         request.setExcludeFromFailureFile(excludeFromFailureFile);
         request.setTargetDirectory(targetDirectory.getAbsolutePath());
         request.setOutputEncoding(getOutputEncoding());
         request.setFormat(format);
         request.setSkipPmdError(skipPmdError);
         request.setIncludeXmlInSite(includeXmlInSite);
         request.setReportOutputDirectory(getReportOutputDirectory().getAbsolutePath());
         request.setLogLevel(determineCurrentRootLogLevel());
 
         Toolchain tc = getToolchain();
         if (tc != null) {
             getLog().info("Toolchain in maven-pmd-plugin: " + tc);
             String javaExecutable = tc.findTool("java"); // NOI18N
             request.setJavaExecutable(javaExecutable);
         }
 
         getLog().info("PMD version: " + AbstractPmdReport.getPmdVersion());
         pmdResult = PmdExecutor.execute(request);
     }
 
     /**
      * Resolves the configured rulesets and copies them as files into the {@link #rulesetsTargetDirectory}.
      *
      * @return comma separated list of absolute file paths of ruleset files
      * @throws MavenReportException if a ruleset could not be found
      */
     private List<String> resolveRulesets() throws MavenReportException {
         // configure ResourceManager - will search for urls (URLResourceLoader) and files in various directories:
         // in the directory of the current project's pom file - note: extensions might replace the pom file on the fly
         locator.addSearchPath(
                 FileResourceLoader.ID, project.getFile().getParentFile().getAbsolutePath());
         // in the current project's directory
         locator.addSearchPath(FileResourceLoader.ID, project.getBasedir().getAbsolutePath());
         // in the base directory - that's the directory of the initial pom requested to build,
         // e.g. the root of a multi module build
         locator.addSearchPath(FileResourceLoader.ID, session.getRequest().getBaseDirectory());
         locator.setOutputDirectory(rulesetsTargetDirectory);
 
         String[] sets = new String[rulesets.length];
         try {
             for (int idx = 0; idx < rulesets.length; idx++) {
                 String set = rulesets[idx];
                 getLog().debug("Preparing ruleset: " + set);
                 String rulesetFilename = determineRulesetFilename(set);
                 File ruleset = locator.getResourceAsFile(rulesetFilename, getLocationTemp(set, idx + 1));
                 if (null == ruleset) {
                     throw new MavenReportException("Could not resolve " + set);
                 }
                 sets[idx] = ruleset.getAbsolutePath();
             }
         } catch (ResourceNotFoundException | FileResourceCreationException e) {
             throw new MavenReportException(e.getMessage(), e);
         }
         return Arrays.asList(sets);
     }
 
     private String determineRulesetFilename(String ruleset) {
         String result = ruleset.trim();
         String lowercase = result.toLowerCase(Locale.ROOT);
         if (lowercase.startsWith("http://") || lowercase.startsWith("https://") || lowercase.endsWith(".xml")) {
             return result;
         }
 
         // assume last part is a single rule, e.g. myruleset.xml/SingleRule
         if (result.indexOf('/') > -1) {
             String rulesetFilename = result.substring(0, result.lastIndexOf('/'));
             if (rulesetFilename.toLowerCase(Locale.ROOT).endsWith(".xml")) {
                 return rulesetFilename;
             }
         }
         // maybe a built-in ruleset name, e.g. java-design -> rulesets/java/design.xml
         int dashIndex = lowercase.indexOf('-');
         if (dashIndex > -1 && lowercase.indexOf('-', dashIndex + 1) == -1) {
             String language = result.substring(0, dashIndex);
             String rulesetName = result.substring(dashIndex + 1);
             return "rulesets/" + language + "/" + rulesetName + ".xml";
         }
         // fallback - no change of the given ruleset specifier
         return result;
     }
 
     /**
      * Convenience method to get the location of the specified file name.
      *
      * @param name the name of the file whose location is to be resolved
      * @param position position in the list of rulesets (1-based)
      * @return a String that contains the absolute file name of the file
      */
     protected String getLocationTemp(String name, int position) {
         String loc = name;
         if (loc.indexOf('/') != -1) {
             loc = loc.substring(loc.lastIndexOf('/') + 1);
         }
         if (loc.indexOf('\\') != -1) {
             loc = loc.substring(loc.lastIndexOf('\\') + 1);
         }
 
         // MPMD-127 in the case that the rules are defined externally on a url
         // we need to replace some special url characters that cannot be
         // used in filenames on disk or produce ackward filenames.
         // replace all occurrences of the following characters: ? : & = %
         loc = loc.replaceAll("[\\?\\:\\&\\=\\%]", "_");
 
         if (loc.endsWith(".xml")) {
             loc = loc.substring(0, loc.length() - 4);
         }
         loc = String.format("%03d-%s.xml", position, loc);
 
         getLog().debug("Before: " + name + " After: " + loc);
         return loc;
     }
 
     private String determineAuxClasspath() throws MavenReportException {
         try {
             List<String> classpath = new ArrayList<>();
             if (isAggregator()) {
                 List<String> dependencies = new ArrayList<>();
 
                 // collect exclusions for projects within the reactor
                 // if module a depends on module b and both are in the reactor
                 // then we don't want to resolve the dependency as an artifact.
                 List<String> exclusionPatterns = new ArrayList<>();
                 for (MavenProject localProject : getAggregatedProjects()) {
                     exclusionPatterns.add(localProject.getGroupId() + ":" + localProject.getArtifactId());
                 }
                 TransformableFilter filter = new AndFilter(Arrays.asList(
                         new ExclusionsFilter(exclusionPatterns),
                         includeTests
                                 ? ScopeFilter.including("compile", "provided", "test")
                                 : ScopeFilter.including("compile", "provided")));
 
                 for (MavenProject localProject : getAggregatedProjects()) {
                     ProjectBuildingRequest buildingRequest =
                             new DefaultProjectBuildingRequest(session.getProjectBuildingRequest());
                     // use any additional configured repo as well
                     buildingRequest.getRemoteRepositories().addAll(localProject.getRemoteArtifactRepositories());
 
                     List<Dependency> managedDependencies = localProject.getDependencyManagement() == null
                             ? null
                             : localProject.getDependencyManagement().getDependencies();
                     Iterable<ArtifactResult> resolvedDependencies = dependencyResolver.resolveDependencies(
                             buildingRequest, localProject.getDependencies(), managedDependencies, filter);
 
                     for (ArtifactResult resolvedArtifact : resolvedDependencies) {
                         dependencies.add(
                                 resolvedArtifact.getArtifact().getFile().toString());
                     }
 
                     List<String> projectClasspath = includeTests
                             ? localProject.getTestClasspathElements()
                             : localProject.getCompileClasspathElements();
 
                     // Add the project's target folder first
                     classpath.addAll(projectClasspath);
                     if (!localProject.isExecutionRoot()) {
                         for (String path : projectClasspath) {
                             File pathFile = new File(path);
                             String[] children = pathFile.list();
 
                             if (!pathFile.exists() || (children != null && children.length == 0)) {
                                 getLog().warn("The project " + localProject.getArtifactId()
                                         + " does not seem to be compiled. PMD results might be inaccurate.");
                             }
                         }
                     }
                 }
 
                 // Add the dependencies as last entries
                 classpath.addAll(dependencies);
 
                 getLog().debug("Using aggregated aux classpath: " + classpath);
             } else {
                 classpath.addAll(
                         includeTests ? project.getTestClasspathElements() : project.getCompileClasspathElements());
 
                 getLog().debug("Using aux classpath: " + classpath);
             }
             String path = StringUtils.join(classpath.iterator(), File.pathSeparator);
             return path;
         } catch (Exception e) {
             throw new MavenReportException(e.getMessage(), e);
         }
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public String getOutputName() {
         return "pmd";
     }
 
     /**
      * Create and return the correct renderer for the output type.
      *
      * @return the renderer based on the configured output
      * @throws org.apache.maven.reporting.MavenReportException if no renderer found for the output type
      * @deprecated Use {@link PmdExecutor#createRenderer(String, String)} instead.
      */
     @Deprecated
     public final Renderer createRenderer() throws MavenReportException {
         return PmdExecutor.createRenderer(format, getOutputEncoding());
     }
 }