/*
    * 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.plugin.compiler;
  
  import java.io.File;
  import java.io.IOException;
  import java.nio.file.Path;
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.HashSet;
  import java.util.LinkedHashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.Map.Entry;
  import java.util.Objects;
  import java.util.Optional;
  import java.util.Set;
  
  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.project.MavenProject;
  import org.apache.maven.shared.utils.StringUtils;
  import org.apache.maven.shared.utils.logging.MessageUtils;
  import org.apache.maven.toolchain.Toolchain;
  import org.apache.maven.toolchain.java.DefaultJavaToolChain;
  import org.codehaus.plexus.compiler.util.scan.SimpleSourceInclusionScanner;
  import org.codehaus.plexus.compiler.util.scan.SourceInclusionScanner;
  import org.codehaus.plexus.compiler.util.scan.StaleSourceScanner;
  import org.codehaus.plexus.languages.java.jpms.JavaModuleDescriptor;
  import org.codehaus.plexus.languages.java.jpms.LocationManager;
  import org.codehaus.plexus.languages.java.jpms.ModuleNameSource;
  import org.codehaus.plexus.languages.java.jpms.ResolvePathsRequest;
  import org.codehaus.plexus.languages.java.jpms.ResolvePathsResult;
  
  /**
   * Compiles application sources
   *
   * @author <a href="mailto:jason@maven.org">Jason van Zyl </a>
   * @since 2.0
   */
  @Mojo(
          name = "compile",
          defaultPhase = LifecyclePhase.COMPILE,
          threadSafe = true,
          requiresDependencyResolution = ResolutionScope.COMPILE)
  public class CompilerMojo extends AbstractCompilerMojo {
      /**
       * The source directories containing the sources to be compiled.
       */
      @Parameter(defaultValue = "${project.compileSourceRoots}", readonly = false, required = true)
      private List<String> compileSourceRoots;
  
      /**
       * The directory for compiled classes.
       * <p>
       * This parameter should only be modified in special cases. One example is creating
       * a multi-release jar with a lower bytecode level (i.e. setting it to
       * {@code ${project.build.outputDirectory}/META-INF/versions/21} or similar) in an additional
       * execution.
       * <p>
       * When the required bytecode level is available though an installed JDK or toolchain,
       * it is recommended to use the {@code <release>} property
       * in conjunction with the ${multiReleaseOutput} parameter instead.
       */
      @Parameter(
              property = "maven.compiler.outputDirectory",
              defaultValue = "${project.build.outputDirectory}",
              required = true,
              readonly = false)
      private File outputDirectory;
  
      /**
       * Projects main artifact.
       *
       * @todo this is an export variable, really
       */
      @Parameter(defaultValue = "${project.artifact}", readonly = true, required = true)
      private Artifact projectArtifact;
 
     /**
      * A list of inclusion filters for the compiler.
      */
     @Parameter
     private Set<String> includes = new HashSet<>();
 
     /**
      * A list of exclusion filters for the compiler.
      */
     @Parameter
     private Set<String> excludes = new HashSet<>();
 
     /**
      * A list of exclusion filters for the incremental calculation.
      * @since 3.11
      */
     @Parameter
     private Set<String> incrementalExcludes = new HashSet<>();
 
     /**
      * <p>
      * Specify where to place generated source files created by annotation processing. Only applies to JDK 1.6+
      * </p>
      *
      * @since 2.2
      */
     @Parameter(defaultValue = "${project.build.directory}/generated-sources/annotations")
     private File generatedSourcesDirectory;
 
     /**
      * Set this to 'true' to bypass compilation of main sources. Its use is NOT RECOMMENDED, but quite convenient on
      * occasion.
      */
     @Parameter(property = "maven.main.skip")
     private boolean skipMain;
 
     @Parameter(defaultValue = "${project.compileClasspathElements}", readonly = true, required = true)
     private List<String> compilePath;
 
     /**
      * <p>
      * When set to {@code true}, the classes will be placed in <code>META-INF/versions/${release}</code> The release
      * value must be set, otherwise the plugin will fail.
      * </p>
      * <strong>Note: </strong> A jar is only a multirelease jar if <code>META-INF/MANIFEST.MF</code> contains
      * <code>Multi-Release: true</code>. You need to set this by configuring the <a href=
      * "https://maven.apache.org/plugins/maven-jar-plugin/examples/manifest-customization.html">maven-jar-plugin</a>.
      * This implies that you cannot test a multirelease jar using the outputDirectory.
      *
      * @since 3.7.1
      */
     @Parameter
     private boolean multiReleaseOutput;
 
     /**
      * when forking and debug activated the commandline used will be dumped in this file
      * @since 3.10.0
      */
     @Parameter(defaultValue = "javac")
     private String debugFileName;
 
     final LocationManager locationManager = new LocationManager();
 
     private List<String> classpathElements;
 
     private List<String> modulepathElements;
 
     private Map<String, JavaModuleDescriptor> pathElements;
 
     @Override
     protected List<String> getCompileSourceRoots() {
         return compileSourceRoots;
     }
 
     @Override
     protected List<String> getClasspathElements() {
         return classpathElements;
     }
 
     @Override
     protected List<String> getModulepathElements() {
         return modulepathElements;
     }
 
     @Override
     protected Map<String, JavaModuleDescriptor> getPathElements() {
         return pathElements;
     }
 
     @Override
     protected File getOutputDirectory() {
         File dir;
         if (!multiReleaseOutput) {
             dir = outputDirectory;
         } else {
             dir = new File(outputDirectory, "META-INF/versions/" + release);
         }
         return dir;
     }
 
     @Override
     public void execute() throws MojoExecutionException, CompilationFailureException {
         if (skipMain) {
             getLog().info("Not compiling main sources");
             return;
         }
 
         if (multiReleaseOutput && release == null) {
             throw new MojoExecutionException("When using 'multiReleaseOutput' the release must be set");
         }
 
         super.execute();
 
         if (outputDirectory.isDirectory()) {
             File artifactFile = projectArtifact.getFile();
             if (artifactFile != null && !Objects.equals(artifactFile, outputDirectory)) {
                 getLog().warn("Overwriting artifact's file from " + artifactFile + " to " + outputDirectory);
             }
             projectArtifact.setFile(outputDirectory);
         }
     }
 
     @Override
     protected Set<String> getIncludes() {
         return includes;
     }
 
     @Override
     protected Set<String> getExcludes() {
         return excludes;
     }
 
     @Override
     protected void preparePaths(Set<File> sourceFiles) {
         // assert compilePath != null;
 
         Optional<Path> moduleDeclaration = getModuleDeclaration(sourceFiles);
 
         if (moduleDeclaration.isPresent()) {
             // For now only allow named modules. Once we can create a graph with ASM we can specify exactly the modules
             // and we can detect if auto modules are used. In that case, MavenProject.setFile() should not be used, so
             // you cannot depend on this project and so it won't be distributed.
 
             modulepathElements = new ArrayList<>(compilePath.size());
             classpathElements = new ArrayList<>(compilePath.size());
             pathElements = new LinkedHashMap<>(compilePath.size());
 
             ResolvePathsResult<File> resolvePathsResult;
             try {
                 Collection<File> dependencyArtifacts = getCompileClasspathElements(getProject());
 
                 ResolvePathsRequest<File> request = ResolvePathsRequest.ofFiles(dependencyArtifacts)
                         .setIncludeStatic(true)
                         .setMainModuleDescriptor(moduleDeclaration.get().toFile());
 
                 Toolchain toolchain = getToolchain();
                 if (toolchain instanceof DefaultJavaToolChain) {
                     request.setJdkHome(new File(((DefaultJavaToolChain) toolchain).getJavaHome()));
                 }
 
                 resolvePathsResult = locationManager.resolvePaths(request);
 
                 for (Entry<File, Exception> pathException :
                         resolvePathsResult.getPathExceptions().entrySet()) {
                     Throwable cause = pathException.getValue();
                     while (cause.getCause() != null) {
                         cause = cause.getCause();
                     }
                     String fileName = pathException.getKey().getName();
                     getLog().warn("Can't extract module name from " + fileName + ": " + cause.getMessage());
                 }
 
                 JavaModuleDescriptor moduleDescriptor = resolvePathsResult.getMainModuleDescriptor();
 
                 detectFilenameBasedAutomodules(resolvePathsResult, moduleDescriptor);
 
                 for (Map.Entry<File, JavaModuleDescriptor> entry :
                         resolvePathsResult.getPathElements().entrySet()) {
                     pathElements.put(entry.getKey().getPath(), entry.getValue());
                 }
 
                 if (compilerArgs == null) {
                     compilerArgs = new ArrayList<>();
                 }
 
                 for (File file : resolvePathsResult.getClasspathElements()) {
                     classpathElements.add(file.getPath());
 
                     if (multiReleaseOutput) {
                         if (getOutputDirectory().toPath().startsWith(file.getPath())) {
                             compilerArgs.add("--patch-module");
                             compilerArgs.add(String.format("%s=%s", moduleDescriptor.name(), file.getPath()));
                         }
                     }
                 }
 
                 for (File file : resolvePathsResult.getModulepathElements().keySet()) {
                     modulepathElements.add(file.getPath());
                 }
 
                 compilerArgs.add("--module-version");
                 compilerArgs.add(getProject().getVersion());
 
             } catch (IOException e) {
                 getLog().warn(e.getMessage());
             }
         } else {
             classpathElements = new ArrayList<>();
             for (File element : getCompileClasspathElements(getProject())) {
                 classpathElements.add(element.getPath());
             }
             modulepathElements = Collections.emptyList();
             pathElements = Collections.emptyMap();
         }
     }
 
     private void detectFilenameBasedAutomodules(
             final ResolvePathsResult<File> resolvePathsResult, final JavaModuleDescriptor moduleDescriptor) {
         List<String> automodulesDetected = new ArrayList<>();
         for (Entry<File, ModuleNameSource> entry :
                 resolvePathsResult.getModulepathElements().entrySet()) {
             if (ModuleNameSource.FILENAME.equals(entry.getValue())) {
                 automodulesDetected.add(entry.getKey().getName());
             }
         }
 
         if (!automodulesDetected.isEmpty()) {
             final String message = "Required filename-based automodules detected: "
                     + automodulesDetected + ". "
                     + "Please don't publish this project to a public artifact repository!";
 
             if (moduleDescriptor.exports().isEmpty()) {
                 // application
                 getLog().info(message);
             } else {
                 // library
                 writeBoxedWarning(message);
             }
         }
     }
 
     private List<File> getCompileClasspathElements(MavenProject project) {
         // 3 is outputFolder + 2 preserved for multirelease
         List<File> list = new ArrayList<>(project.getArtifacts().size() + 3);
 
         if (multiReleaseOutput) {
             File versionsFolder = new File(project.getBuild().getOutputDirectory(), "META-INF/versions");
 
             // in reverse order
             for (int version = Integer.parseInt(getRelease()) - 1; version >= 9; version--) {
                 File versionSubFolder = new File(versionsFolder, String.valueOf(version));
                 if (versionSubFolder.exists()) {
                     list.add(versionSubFolder);
                 }
             }
         }
 
         list.add(new File(project.getBuild().getOutputDirectory()));
 
         for (Artifact a : project.getArtifacts()) {
             if (a.getArtifactHandler().isAddedToClasspath()) {
                 list.add(a.getFile());
             }
         }
         return list;
     }
 
     @Override
     protected SourceInclusionScanner getSourceInclusionScanner(int staleMillis) {
         if (includes.isEmpty() && excludes.isEmpty() && incrementalExcludes.isEmpty()) {
             return new StaleSourceScanner(staleMillis);
         }
 
         if (includes.isEmpty()) {
             includes.add("**/*.java");
         }
 
         Set<String> excludesIncr = new HashSet<>(excludes);
         excludesIncr.addAll(this.incrementalExcludes);
         return new StaleSourceScanner(staleMillis, includes, excludesIncr);
     }
 
     @Override
     protected SourceInclusionScanner getSourceInclusionScanner(String inputFileEnding) {
         // it's not defined if we get the ending with or without the dot '.'
         String defaultIncludePattern = "**/*" + (inputFileEnding.startsWith(".") ? "" : ".") + inputFileEnding;
 
         if (includes.isEmpty()) {
             includes.add(defaultIncludePattern);
         }
         Set<String> excludesIncr = new HashSet<>(excludes);
         excludesIncr.addAll(excludesIncr);
         return new SimpleSourceInclusionScanner(includes, excludesIncr);
     }
 
     @Override
     protected String getSource() {
         return source;
     }
 
     @Override
     protected String getTarget() {
         return target;
     }
 
     @Override
     protected String getRelease() {
         return release;
     }
 
     @Override
     protected String getCompilerArgument() {
         return compilerArgument;
     }
 
     @Override
     protected Map<String, String> getCompilerArguments() {
         return compilerArguments;
     }
 
     @Override
     protected File getGeneratedSourcesDirectory() {
         return generatedSourcesDirectory;
     }
 
     @Override
     protected String getDebugFileName() {
         return debugFileName;
     }
 
     private void writeBoxedWarning(String message) {
         String line = StringUtils.repeat("*", message.length() + 4);
         getLog().warn(line);
         getLog().warn("* " + MessageUtils.buffer().strong(message) + " *");
         getLog().warn(line);
     }
 }