/*
    * 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.resolvers;
  
  import java.io.File;
  import java.io.IOException;
  import java.lang.reflect.InvocationTargetException;
  import java.lang.reflect.Method;
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.LinkedHashSet;
  import java.util.List;
  import java.util.Objects;
  import java.util.Set;
  import java.util.jar.JarFile;
  import java.util.jar.Manifest;
  
  import org.apache.maven.artifact.Artifact;
  import org.apache.maven.plugin.MojoExecutionException;
  import org.apache.maven.plugins.annotations.LifecyclePhase;
  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.dependency.utils.DependencyStatusSets;
  import org.apache.maven.plugins.dependency.utils.DependencyUtil;
  import org.apache.maven.plugins.dependency.utils.filters.ResolveFileFilter;
  import org.apache.maven.plugins.dependency.utils.markers.SourcesFileMarkerHandler;
  import org.apache.maven.shared.artifact.filter.collection.ArtifactsFilter;
  import org.apache.maven.shared.utils.logging.MessageBuilder;
  import org.apache.maven.shared.utils.logging.MessageUtils;
  
  /**
   * Goal that resolves the project dependencies from the repository. When using this goal while running on Java 9 the
   * module names will be visible as well.
   *
   * @author <a href="mailto:brianf@apache.org">Brian Fox</a>
   * @since 2.0
   */
  @Mojo(
          name = "resolve",
          requiresDependencyResolution = ResolutionScope.TEST,
          defaultPhase = LifecyclePhase.GENERATE_SOURCES,
          threadSafe = true)
  public class ResolveDependenciesMojo extends AbstractResolveMojo {
  
      @Parameter(property = "outputEncoding", defaultValue = "${project.reporting.outputEncoding}")
      private String outputEncoding;
  
      /**
       * If we should display the scope when resolving
       *
       * @since 2.0-alpha-2
       */
      @Parameter(property = "mdep.outputScope", defaultValue = "true")
      protected boolean outputScope;
  
      /**
       * Output absolute filename for resolved artifacts
       *
       * @since 2.0
       */
      @Parameter(property = "outputAbsoluteArtifactFilename", defaultValue = "false")
      private boolean outputAbsoluteArtifactFilename;
  
      /**
       * Only used to store results for integration test validation
       */
      DependencyStatusSets results;
  
      /**
       * Sort the output list of resolved artifacts alphabetically. The default ordering matches the classpath order.
       *
       * @since 2.8
       */
      @Parameter(property = "sort", defaultValue = "false")
      boolean sort;
  
      /**
       * Include parent poms in the dependency resolution list.
       *
       * @since 2.8
       */
      @Parameter(property = "includeParents", defaultValue = "false")
     boolean includeParents;
 
     /**
      * Main entry into mojo. Gets the list of dependencies and iterates through displaying the resolved version.
      *
      * @throws MojoExecutionException with a message if an error occurs
      */
     @Override
     protected void doExecute() throws MojoExecutionException {
         // get sets of dependencies
         results = this.getDependencySets(false, includeParents);
 
         String output = getOutput(outputAbsoluteArtifactFilename, outputScope, sort);
         try {
             if (outputFile == null) {
                 DependencyUtil.log(output, getLog());
             } else {
                 String encoding = Objects.toString(outputEncoding, "UTF-8");
                 DependencyUtil.write(output, outputFile, appendOutput, encoding);
             }
         } catch (IOException e) {
             throw new MojoExecutionException(e.getMessage(), e);
         }
     }
 
     /**
      * @return returns the results
      */
     public DependencyStatusSets getResults() {
         return this.results;
     }
 
     @Override
     protected ArtifactsFilter getMarkedArtifactFilter() {
         return new ResolveFileFilter(new SourcesFileMarkerHandler(this.markersDirectory));
     }
 
     /**
      * @param outputAbsoluteArtifactFilename absolute artifact filename
      * @param theOutputScope the output scope
      * @param theSort sort yes/no
      * @return the output
      */
     public String getOutput(boolean outputAbsoluteArtifactFilename, boolean theOutputScope, boolean theSort) {
         StringBuilder sb = new StringBuilder();
         sb.append(System.lineSeparator());
         sb.append("The following files have been resolved:");
         sb.append(System.lineSeparator());
         if (results.getResolvedDependencies() == null
                 || results.getResolvedDependencies().isEmpty()) {
             sb.append("   none");
             sb.append(System.lineSeparator());
         } else {
             sb.append(buildArtifactListOutput(
                     results.getResolvedDependencies(), outputAbsoluteArtifactFilename, theOutputScope, theSort));
         }
 
         if (results.getSkippedDependencies() != null
                 && !results.getSkippedDependencies().isEmpty()) {
             sb.append(System.lineSeparator());
             sb.append("The following files were skipped:");
             sb.append(System.lineSeparator());
             Set<Artifact> skippedDependencies = new LinkedHashSet<>(results.getSkippedDependencies());
             sb.append(buildArtifactListOutput(
                     skippedDependencies, outputAbsoluteArtifactFilename, theOutputScope, theSort));
         }
 
         if (results.getUnResolvedDependencies() != null
                 && !results.getUnResolvedDependencies().isEmpty()) {
             sb.append(System.lineSeparator());
             sb.append("The following files have NOT been resolved:");
             sb.append(System.lineSeparator());
             Set<Artifact> unResolvedDependencies = new LinkedHashSet<>(results.getUnResolvedDependencies());
             sb.append(buildArtifactListOutput(
                     unResolvedDependencies, outputAbsoluteArtifactFilename, theOutputScope, theSort));
         }
         sb.append(System.lineSeparator());
 
         return sb.toString();
     }
 
     private StringBuilder buildArtifactListOutput(
             Set<Artifact> artifacts, boolean outputAbsoluteArtifactFilename, boolean theOutputScope, boolean theSort) {
         StringBuilder sb = new StringBuilder();
         List<String> artifactStringList = new ArrayList<>();
         for (Artifact artifact : artifacts) {
             MessageBuilder messageBuilder = MessageUtils.buffer();
 
             messageBuilder.a("   ");
 
             if (theOutputScope) {
                 messageBuilder.a(artifact.toString());
             } else {
                 messageBuilder.a(artifact.getId());
             }
 
             if (outputAbsoluteArtifactFilename) {
                 try {
                     // we want to print the absolute file name here
                     String artifactFilename =
                             artifact.getFile().getAbsoluteFile().getPath();
 
                     messageBuilder.a(':').a(artifactFilename);
                 } catch (NullPointerException e) {
                     // ignore the null pointer, we'll output a null string
                 }
             }
 
             if (theOutputScope && artifact.isOptional()) {
                 messageBuilder.a(" (optional)");
             }
 
             // dependencies:collect won't download jars
             if (artifact.getFile() != null) {
                 ModuleDescriptor moduleDescriptor = getModuleDescriptor(artifact.getFile());
                 if (moduleDescriptor != null) {
                     messageBuilder.project(" -- module " + moduleDescriptor.name);
 
                     if (moduleDescriptor.automatic) {
                         if ("MANIFEST".equals(moduleDescriptor.moduleNameSource)) {
                             messageBuilder.strong(" [auto]");
                         } else {
                             messageBuilder.warning(" (auto)");
                         }
                     }
                 }
             }
             artifactStringList.add(messageBuilder + System.lineSeparator());
         }
         if (theSort) {
             Collections.sort(artifactStringList);
         }
         for (String artifactString : artifactStringList) {
             sb.append(artifactString);
         }
         return sb;
     }
 
     private ModuleDescriptor getModuleDescriptor(File artifactFile) {
         ModuleDescriptor moduleDescriptor = null;
         try {
             // Use Java9 code to get moduleName, don't try to do it better with own implementation
             Class<?> moduleFinderClass = Class.forName("java.lang.module.ModuleFinder");
 
             java.nio.file.Path path = artifactFile.toPath();
 
             Method ofMethod = moduleFinderClass.getMethod("of", java.nio.file.Path[].class);
             Object moduleFinderInstance = ofMethod.invoke(null, new Object[] {new java.nio.file.Path[] {path}});
 
             Method findAllMethod = moduleFinderClass.getMethod("findAll");
             Set<Object> moduleReferences = (Set<Object>) findAllMethod.invoke(moduleFinderInstance);
 
             // moduleReferences can be empty when referring to target/classes without module-info.class
             if (!moduleReferences.isEmpty()) {
                 Object moduleReference = moduleReferences.iterator().next();
                 Method descriptorMethod = moduleReference.getClass().getMethod("descriptor");
                 Object moduleDescriptorInstance = descriptorMethod.invoke(moduleReference);
 
                 Method nameMethod = moduleDescriptorInstance.getClass().getMethod("name");
                 String name = (String) nameMethod.invoke(moduleDescriptorInstance);
 
                 moduleDescriptor = new ModuleDescriptor();
                 moduleDescriptor.name = name;
 
                 Method isAutomaticMethod = moduleDescriptorInstance.getClass().getMethod("isAutomatic");
                 moduleDescriptor.automatic = (Boolean) isAutomaticMethod.invoke(moduleDescriptorInstance);
 
                 if (moduleDescriptor.automatic) {
                     if (artifactFile.isFile()) {
                         try (JarFile jarFile = new JarFile(artifactFile)) {
                             Manifest manifest = jarFile.getManifest();
 
                             if (manifest != null
                                     && manifest.getMainAttributes().getValue("Automatic-Module-Name") != null) {
                                 moduleDescriptor.moduleNameSource = "MANIFEST";
                             } else {
                                 moduleDescriptor.moduleNameSource = "FILENAME";
                             }
                         } catch (IOException e) {
                             // noop
                         }
                     }
                 }
             }
         } catch (ClassNotFoundException | SecurityException | IllegalAccessException | IllegalArgumentException e) {
             // do nothing
         } catch (NoSuchMethodException e) {
             getLog().warn(e);
         } catch (InvocationTargetException e) {
             Throwable cause = e.getCause();
             while (cause.getCause() != null) {
                 cause = cause.getCause();
             }
             getLog().info("Can't extract module name from " + artifactFile.getName() + ": " + cause.getMessage());
         }
         return moduleDescriptor;
     }
 
     private static class ModuleDescriptor {
         String name;
 
         boolean automatic = true;
 
         String moduleNameSource;
     }
 }