/*
    * 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.dependency.analyze;
  
  import java.io.File;
  import java.io.StringWriter;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Iterator;
  import java.util.LinkedHashMap;
  import java.util.LinkedHashSet;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  
  import org.apache.maven.artifact.Artifact;
  import org.apache.maven.artifact.resolver.filter.ArtifactFilter;
  import org.apache.maven.plugin.AbstractMojo;
  import org.apache.maven.plugin.MojoExecutionException;
  import org.apache.maven.plugin.MojoFailureException;
  import org.apache.maven.plugins.annotations.Parameter;
  import org.apache.maven.project.MavenProject;
  import org.apache.maven.shared.artifact.filter.StrictPatternExcludesArtifactFilter;
  import org.apache.maven.shared.dependency.analyzer.ProjectDependencyAnalysis;
  import org.apache.maven.shared.dependency.analyzer.ProjectDependencyAnalyzer;
  import org.apache.maven.shared.dependency.analyzer.ProjectDependencyAnalyzerException;
  import org.codehaus.plexus.PlexusContainer;
  import org.codehaus.plexus.component.repository.exception.ComponentLookupException;
  import org.codehaus.plexus.util.xml.PrettyPrintXMLWriter;
  
  /**
   * Analyzes the dependencies of this project and determines which are: used and declared; used and undeclared; unused
   * and declared; compile scoped but only used in tests.
   *
   * @author <a href="mailto:markhobson@gmail.com">Mark Hobson</a>
   * @since 2.0-alpha-5
   */
  public abstract class AbstractAnalyzeMojo extends AbstractMojo {
      // fields -----------------------------------------------------------------
  
      /**
       * Specify the project dependency analyzer to use (plexus component role-hint). By default,
       * <a href="/shared/maven-dependency-analyzer/">maven-dependency-analyzer</a> is used. To use this, you must declare
       * a dependency for this plugin that contains the code for the analyzer. The analyzer must have a declared Plexus
       * role name, and you specify the role name here.
       *
       * @since 2.2
       */
      @Parameter(property = "analyzer", defaultValue = "default")
      private String analyzer;
  
      /**
       * Whether to fail the build if a dependency warning is found.
       */
      @Parameter(property = "failOnWarning", defaultValue = "false")
      private boolean failOnWarning;
  
      /**
       * Output used dependencies.
       */
      @Parameter(property = "verbose", defaultValue = "false")
      private boolean verbose;
  
      /**
       * Ignore runtime/provided/test/system scopes for unused dependency analysis.
       * <p>
       * <code><b>Non-test scoped</b></code> list will be not affected.
       */
      @Parameter(property = "ignoreNonCompile", defaultValue = "false")
      private boolean ignoreNonCompile;
  
      /**
       * Ignore runtime scope for unused dependency analysis.
       *
       * @since 3.2.0
       */
      @Parameter(property = "ignoreUnusedRuntime", defaultValue = "false")
      private boolean ignoreUnusedRuntime;
  
      /**
       * Ignore all dependencies that are used only in test but not test-scoped. Setting
       * this flag has the same effect as adding all dependencies that have been flagged with
       * the <i>Non-test scoped test only dependencies found</i> warning to the
      * <code>&lt;ignoredNonTestScopedDependencies&gt;</code> configuration.
      *
      * @since 3.3.1-SNAPSHOT
      */
     @Parameter(property = "ignoreAllNonTestScoped", defaultValue = "false")
     private boolean ignoreAllNonTestScoped;
 
     /**
      * Output the xml for the missing dependencies (used but not declared).
      *
      * @since 2.0-alpha-5
      */
     @Parameter(property = "outputXML", defaultValue = "false")
     private boolean outputXML;
 
     /**
      * Output scriptable values for the missing dependencies (used but not declared).
      *
      * @since 2.0-alpha-5
      */
     @Parameter(property = "scriptableOutput", defaultValue = "false")
     private boolean scriptableOutput;
 
     /**
      * Flag to use for scriptable output.
      *
      * @since 2.0-alpha-5
      */
     @Parameter(property = "scriptableFlag", defaultValue = "$$$%%%")
     private String scriptableFlag;
 
     /**
      * Flag to use for scriptable output.
      *
      * @since 2.0-alpha-5
      */
     @Parameter(defaultValue = "${basedir}", readonly = true)
     private File baseDir;
 
     /**
      * Target folder.
      *
      * @since 2.0-alpha-5
      */
     @Parameter(defaultValue = "${project.build.directory}", readonly = true)
     private File outputDirectory;
 
     /**
      * Force dependencies as used, to override incomplete result caused by bytecode-level analysis. Dependency format is
      * <code>groupId:artifactId</code>.
      *
      * @since 2.6
      */
     @Parameter
     private String[] usedDependencies;
 
     /**
      * Skip plugin execution completely.
      *
      * @since 2.7
      */
     @Parameter(property = "mdep.analyze.skip", defaultValue = "false")
     private boolean skip;
 
     /**
      * List of dependencies that will be ignored. Any dependency on this list will be excluded from the "declared but
      * unused", the "used but undeclared", and the "non-test scoped" list. The filter syntax is:
      *
      * <pre>
      * [groupId]:[artifactId]:[type]:[version]
      * </pre>
      *
      * where each pattern segment is optional and supports full and partial <code>*</code> wildcards. An empty pattern
      * segment is treated as an implicit wildcard. *
      * <p>
      * For example, <code>org.apache.*</code> will match all artifacts whose group id starts with
      * <code>org.apache.</code>, and <code>:::*-SNAPSHOT</code> will match all snapshot artifacts.
      * </p>
      *
      * @since 2.10
      */
     @Parameter
     private String[] ignoredDependencies = new String[0];
 
     /**
      * List of dependencies that will be ignored if they are used but undeclared. The filter syntax is:
      *
      * <pre>
      * [groupId]:[artifactId]:[type]:[version]
      * </pre>
      *
      * where each pattern segment is optional and supports full and partial <code>*</code> wildcards. An empty pattern
      * segment is treated as an implicit wildcard. *
      * <p>
      * For example, <code>org.apache.*</code> will match all artifacts whose group id starts with
      * <code>org.apache.</code>, and <code>:::*-SNAPSHOT</code> will match all snapshot artifacts.
      * </p>
      *
      * @since 2.10
      */
     @Parameter
     private String[] ignoredUsedUndeclaredDependencies = new String[0];
 
     /**
      * List of dependencies that are ignored if they are declared but unused. The filter syntax is:
      *
      * <pre>
      * [groupId]:[artifactId]:[type]:[version]
      * </pre>
      *
      * where each pattern segment is optional and supports full and partial <code>*</code> wildcards. An empty pattern
      * segment is treated as an implicit wildcard. *
      * <p>
      * For example, <code>org.apache.*</code> matches all artifacts whose group id starts with
      * <code>org.apache.</code>, and <code>:::*-SNAPSHOT</code> matches all snapshot artifacts.
      * </p>
      *
      * <p>Certain dependencies that are known to be used and loaded by reflection
      * are always ignored. This includes {@code org.slf4j:slf4j-simple::}.</p>
      *
      * @since 2.10
      */
     @Parameter
     private String[] ignoredUnusedDeclaredDependencies = new String[0];
 
     private String[] unconditionallyIgnoredDeclaredDependencies = {"org.slf4j:slf4j-simple::"};
 
     /**
      * List of dependencies that are ignored if they are in not test scope but are only used in test classes.
      * The filter syntax is:
      *
      * <pre>
      * [groupId]:[artifactId]:[type]:[version]
      * </pre>
      *
      * where each pattern segment is optional and supports full and partial <code>*</code> wildcards. An empty pattern
      * segment is treated as an implicit wildcard. *
      * <p>
      * For example, <code>org.apache.*</code> matched all artifacts whose group id starts with
      * <code>org.apache.</code>, and <code>:::*-SNAPSHOT</code> will match all snapshot artifacts.
      * </p>
      *
      * @since 3.3.0
      */
     @Parameter(defaultValue = "org.slf4j:slf4j-simple::")
     private String[] ignoredNonTestScopedDependencies;
 
     /**
      * List of project packaging that will be ignored.
      * <br/>
      * <b>Default value is<b>: <code>pom, ear</code>
      *
      * @since 3.2.1
      */
     @Parameter(defaultValue = "pom,ear")
     private List<String> ignoredPackagings;
 
     /**
      * List of class patterns excluded from analyze. Java regular expression pattern is applied to full class name.
      *
      * @since 3.7.0
      */
     @Parameter(property = "mdep.analyze.excludedClasses")
     private Set<String> excludedClasses;
 
     /**
      * The plexusContainer to look up the {@link ProjectDependencyAnalyzer} implementation depending on the mojo
      * configuration.
      */
     private final PlexusContainer plexusContainer;
 
     /**
      * The Maven project to analyze.
      */
     private final MavenProject project;
 
     protected AbstractAnalyzeMojo(PlexusContainer plexusContainer, MavenProject project) {
         this.plexusContainer = plexusContainer;
         this.project = project;
     }
 
     // Mojo methods -----------------------------------------------------------
 
     /*
      * @see org.apache.maven.plugin.Mojo#execute()
      */
     @Override
     public void execute() throws MojoExecutionException, MojoFailureException {
         if (isSkip()) {
             getLog().info("Skipping plugin execution");
             return;
         }
 
         if (ignoredPackagings.contains(project.getPackaging())) {
             getLog().info("Skipping " + project.getPackaging() + " project");
             return;
         }
 
         if (outputDirectory == null || !outputDirectory.exists()) {
             getLog().info("Skipping project with no build directory");
             return;
         }
 
         boolean warning = checkDependencies();
 
         if (warning && failOnWarning) {
             throw new MojoExecutionException("Dependency problems found");
         }
     }
 
     /**
      * @return {@link ProjectDependencyAnalyzer}
      * @throws MojoExecutionException in case of an error
      */
     protected ProjectDependencyAnalyzer createProjectDependencyAnalyzer() throws MojoExecutionException {
 
         try {
             return plexusContainer.lookup(ProjectDependencyAnalyzer.class, analyzer);
         } catch (ComponentLookupException exception) {
             throw new MojoExecutionException(
                     "Failed to instantiate ProjectDependencyAnalyser" + " / role-hint " + analyzer, exception);
         }
     }
 
     /**
      * @return {@link #skip}
      */
     protected final boolean isSkip() {
         return skip;
     }
 
     // private methods --------------------------------------------------------
 
     private boolean checkDependencies() throws MojoExecutionException {
         ProjectDependencyAnalysis analysis;
         try {
             analysis = createProjectDependencyAnalyzer().analyze(project, excludedClasses);
 
             if (usedDependencies != null) {
                 analysis = analysis.forceDeclaredDependenciesUsage(usedDependencies);
             }
         } catch (ProjectDependencyAnalyzerException exception) {
             throw new MojoExecutionException("Cannot analyze dependencies", exception);
         }
 
         if (ignoreNonCompile) {
             analysis = analysis.ignoreNonCompile();
         }
 
         Set<Artifact> usedDeclared = new LinkedHashSet<>(analysis.getUsedDeclaredArtifacts());
         Map<Artifact, Set<String>> usedUndeclaredWithClasses =
                 new LinkedHashMap<>(analysis.getUsedUndeclaredArtifactsWithClasses());
         Set<Artifact> unusedDeclared = new LinkedHashSet<>(analysis.getUnusedDeclaredArtifacts());
         Set<Artifact> nonTestScope = new LinkedHashSet<>(analysis.getTestArtifactsWithNonTestScope());
 
         Set<Artifact> ignoredUsedUndeclared = new LinkedHashSet<>();
         Set<Artifact> ignoredUnusedDeclared = new LinkedHashSet<>();
         Set<Artifact> ignoredNonTestScope = new LinkedHashSet<>();
 
         if (ignoreUnusedRuntime) {
             filterArtifactsByScope(unusedDeclared, Artifact.SCOPE_RUNTIME);
         }
 
         ignoredUsedUndeclared.addAll(filterDependencies(usedUndeclaredWithClasses.keySet(), ignoredDependencies));
         ignoredUsedUndeclared.addAll(
                 filterDependencies(usedUndeclaredWithClasses.keySet(), ignoredUsedUndeclaredDependencies));
 
         ignoredUnusedDeclared.addAll(filterDependencies(unusedDeclared, ignoredDependencies));
         ignoredUnusedDeclared.addAll(filterDependencies(unusedDeclared, ignoredUnusedDeclaredDependencies));
         ignoredUnusedDeclared.addAll(filterDependencies(unusedDeclared, unconditionallyIgnoredDeclaredDependencies));
 
         if (ignoreAllNonTestScoped) {
             ignoredNonTestScope.addAll(filterDependencies(nonTestScope, new String[] {"*"}));
         } else {
             ignoredNonTestScope.addAll(filterDependencies(nonTestScope, ignoredDependencies));
             ignoredNonTestScope.addAll(filterDependencies(nonTestScope, ignoredNonTestScopedDependencies));
         }
 
         boolean reported = false;
         boolean warning = false;
 
         if (verbose && !usedDeclared.isEmpty()) {
             getLog().info("Used declared dependencies found:");
 
             logArtifacts(analysis.getUsedDeclaredArtifacts(), false);
             reported = true;
         }
 
         if (!usedUndeclaredWithClasses.isEmpty()) {
             logDependencyWarning("Used undeclared dependencies found:");
 
             if (verbose) {
                 logArtifacts(usedUndeclaredWithClasses);
             } else {
                 logArtifacts(usedUndeclaredWithClasses.keySet(), true);
             }
             reported = true;
             warning = true;
         }
 
         if (!unusedDeclared.isEmpty()) {
             logDependencyWarning("Unused declared dependencies found:");
 
             logArtifacts(unusedDeclared, true);
             reported = true;
             warning = true;
         }
 
         if (!nonTestScope.isEmpty()) {
             logDependencyWarning("Non-test scoped test only dependencies found:");
 
             logArtifacts(nonTestScope, true);
             reported = true;
             warning = true;
         }
 
         if (verbose && !ignoredUsedUndeclared.isEmpty()) {
             getLog().info("Ignored used undeclared dependencies:");
 
             logArtifacts(ignoredUsedUndeclared, false);
             reported = true;
         }
 
         if (verbose && !ignoredUnusedDeclared.isEmpty()) {
             getLog().info("Ignored unused declared dependencies:");
 
             logArtifacts(ignoredUnusedDeclared, false);
             reported = true;
         }
 
         if (verbose && !ignoredNonTestScope.isEmpty()) {
             getLog().info("Ignored non-test scoped test only dependencies:");
 
             logArtifacts(ignoredNonTestScope, false);
             reported = true;
         }
 
         if (outputXML) {
             writeDependencyXML(usedUndeclaredWithClasses.keySet());
         }
 
         if (scriptableOutput) {
             writeScriptableOutput(usedUndeclaredWithClasses.keySet());
         }
 
         if (!reported) {
             getLog().info("No dependency problems found");
         }
 
         return warning;
     }
 
     private void filterArtifactsByScope(Set<Artifact> artifacts, String scope) {
         artifacts.removeIf(artifact -> artifact.getScope().equals(scope));
     }
 
     private void logArtifacts(Set<Artifact> artifacts, boolean warn) {
         if (artifacts.isEmpty()) {
             getLog().info("   None");
         } else {
             for (Artifact artifact : artifacts) {
                 // called because artifact will set the version to -SNAPSHOT only if I do this. MNG-2961
                 artifact.isSnapshot();
 
                 if (warn) {
                     logDependencyWarning("   " + artifact);
                 } else {
                     getLog().info("   " + artifact);
                 }
             }
         }
     }
 
     private void logArtifacts(Map<Artifact, Set<String>> artifacts) {
         if (artifacts.isEmpty()) {
             getLog().info("   None");
         } else {
             for (Map.Entry<Artifact, Set<String>> entry : artifacts.entrySet()) {
                 // called because artifact will set the version to -SNAPSHOT only if I do this. MNG-2961
                 entry.getKey().isSnapshot();
 
                 logDependencyWarning("   " + entry.getKey());
                 for (String clazz : entry.getValue()) {
                     logDependencyWarning("      class " + clazz);
                 }
             }
         }
     }
 
     private void logDependencyWarning(CharSequence content) {
         if (failOnWarning) {
             getLog().error(content);
         } else {
             getLog().warn(content);
         }
     }
 
     private void writeDependencyXML(Set<Artifact> artifacts) {
         if (!artifacts.isEmpty()) {
             getLog().info("Add the following to your pom to correct the missing dependencies: ");
 
             StringWriter out = new StringWriter();
             PrettyPrintXMLWriter writer = new PrettyPrintXMLWriter(out);
 
             for (Artifact artifact : artifacts) {
                 writer.startElement("dependency");
                 writer.startElement("groupId");
                 writer.writeText(artifact.getGroupId());
                 writer.endElement();
                 writer.startElement("artifactId");
                 writer.writeText(artifact.getArtifactId());
                 writer.endElement();
                 writer.startElement("version");
                 writer.writeText(artifact.getBaseVersion());
                 String classifier = artifact.getClassifier();
                 if (classifier != null && !classifier.trim().isEmpty()) {
                     writer.startElement("classifier");
                     writer.writeText(artifact.getClassifier());
                     writer.endElement();
                 }
                 writer.endElement();
 
                 if (!Artifact.SCOPE_COMPILE.equals(artifact.getScope())) {
                     writer.startElement("scope");
                     writer.writeText(artifact.getScope());
                     writer.endElement();
                 }
                 writer.endElement();
             }
 
             getLog().info(System.lineSeparator() + out.getBuffer());
         }
     }
 
     private void writeScriptableOutput(Set<Artifact> artifacts) {
         if (!artifacts.isEmpty()) {
             getLog().info("Missing dependencies: ");
             String pomFile = baseDir.getAbsolutePath() + File.separatorChar + "pom.xml";
             StringBuilder buf = new StringBuilder();
 
             for (Artifact artifact : artifacts) {
                 // called because artifact will set the version to -SNAPSHOT only if I do this. MNG-2961
                 artifact.isSnapshot();
 
                 buf.append(scriptableFlag)
                         .append(":")
                         .append(pomFile)
                         .append(":")
                         .append(artifact.getDependencyConflictId())
                         .append(":")
                         .append(artifact.getClassifier())
                         .append(":")
                         .append(artifact.getBaseVersion())
                         .append(":")
                         .append(artifact.getScope())
                         .append(System.lineSeparator());
             }
             getLog().info(System.lineSeparator() + buf);
         }
     }
 
     private List<Artifact> filterDependencies(Set<Artifact> artifacts, String[] excludes) {
         ArtifactFilter filter = new StrictPatternExcludesArtifactFilter(Arrays.asList(excludes));
         List<Artifact> result = new ArrayList<>();
 
         for (Iterator<Artifact> it = artifacts.iterator(); it.hasNext(); ) {
             Artifact artifact = it.next();
             if (!filter.include(artifact)) {
                 it.remove();
                 result.add(artifact);
             }
         }
 
         return result;
     }
 }