/**
    *
    * Copyright 2004 The Apache Software Foundation
    *
    * Licensed 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.codehaus.plexus.archiver.tar;
  
  import javax.inject.Named;
  
  import java.io.File;
  import java.io.IOException;
  import java.io.InputStream;
  import java.util.zip.GZIPInputStream;
  
  import io.airlift.compress.snappy.SnappyFramedInputStream;
  import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
  import org.apache.commons.compress.archivers.tar.TarArchiveInputStream;
  import org.apache.commons.compress.compressors.bzip2.BZip2CompressorInputStream;
  import org.apache.commons.compress.compressors.xz.XZCompressorInputStream;
  import org.apache.commons.compress.compressors.zstandard.ZstdCompressorInputStream;
  import org.codehaus.plexus.archiver.AbstractUnArchiver;
  import org.codehaus.plexus.archiver.ArchiverException;
  import org.codehaus.plexus.archiver.util.Streams;
  import org.codehaus.plexus.components.io.filemappers.FileMapper;
  
  import static org.codehaus.plexus.archiver.util.Streams.bufferedInputStream;
  import static org.codehaus.plexus.archiver.util.Streams.fileInputStream;
  
  /**
   * @author <a href="mailto:evenisse@codehaus.org">Emmanuel Venisse</a>
   */
  @Named("tar")
  public class TarUnArchiver extends AbstractUnArchiver {
  
      public TarUnArchiver() {}
  
      public TarUnArchiver(File sourceFile) {
          super(sourceFile);
      }
  
      /**
       * compression method
       */
      private UntarCompressionMethod compression = UntarCompressionMethod.NONE;
  
      /**
       * Set decompression algorithm to use; default=none.
       * <p>
       * Allowable values are </p>
       * <ul>
       * <li>none - no compression</li>
       * <li>gzip - Gzip compression</li>
       * <li>bzip2 - Bzip2 compression</li>
       * <li>snappy - Snappy compression</li>
       * <li>xz - Xz compression</li>
       * </ul>
       *
       * @param method compression method
       */
      public void setCompression(UntarCompressionMethod method) {
          compression = method;
      }
  
      /**
       * No encoding support in Untar.
       */
      public void setEncoding(String encoding) {
          getLogger().warn("The TarUnArchiver doesn't support the encoding attribute");
      }
  
      @Override
      protected void execute() throws ArchiverException {
          execute(getSourceFile(), getDestDirectory(), getFileMappers());
      }
  
      @Override
      protected void execute(String path, File outputDirectory) {
          execute(new File(path), getDestDirectory(), getFileMappers());
      }
  
      protected void execute(File sourceFile, File destDirectory, FileMapper[] fileMappers) throws ArchiverException {
          try {
              getLogger().info("Expanding: " + sourceFile + " into " + destDirectory);
              TarFile tarFile = new TarFile(sourceFile);
              try (TarArchiveInputStream tis = new TarArchiveInputStream(
                      decompress(compression, sourceFile, bufferedInputStream(fileInputStream(sourceFile))))) {
                  TarArchiveEntry te;
                  while ((te = tis.getNextTarEntry()) != null) {
                     TarResource fileInfo = new TarResource(tarFile, te);
                     if (isSelected(te.getName(), fileInfo)) {
                         final String symlinkDestination = te.isSymbolicLink() ? te.getLinkName() : null;
                         extractFile(
                                 sourceFile,
                                 destDirectory,
                                 tis,
                                 te.getName(),
                                 te.getModTime(),
                                 te.isDirectory(),
                                 te.getMode() != 0 ? te.getMode() : null,
                                 symlinkDestination,
                                 fileMappers);
                     }
                 }
                 getLogger().debug("expand complete");
             }
         } catch (IOException ioe) {
             throw new ArchiverException("Error while expanding " + sourceFile.getAbsolutePath(), ioe);
         }
     }
 
     /**
      * This method wraps the input stream with the
      * corresponding decompression method
      *
      * @param file provides location information for BuildException
      * @param istream input stream
      *
      * @return input stream with on-the-fly decompression
      *
      * @throws IOException thrown by GZIPInputStream constructor
      */
     private InputStream decompress(UntarCompressionMethod compression, final File file, final InputStream istream)
             throws IOException, ArchiverException {
         if (compression == UntarCompressionMethod.GZIP) {
             return Streams.bufferedInputStream(new GZIPInputStream(istream));
         } else if (compression == UntarCompressionMethod.BZIP2) {
             return new BZip2CompressorInputStream(istream);
         } else if (compression == UntarCompressionMethod.SNAPPY) {
             return new SnappyFramedInputStream(istream, true);
         } else if (compression == UntarCompressionMethod.XZ) {
             return new XZCompressorInputStream(istream);
         } else if (compression == UntarCompressionMethod.ZSTD) {
             return new ZstdCompressorInputStream(istream);
         }
         return istream;
     }
 
     /**
      * Valid Modes for Compression attribute to Untar Task
      */
     public enum UntarCompressionMethod {
         NONE("none"),
         GZIP("gzip"),
         BZIP2("bzip2"),
         SNAPPY("snappy"),
         XZ("xz"),
         ZSTD("zstd");
 
         final String value;
 
         /**
          * Constructor
          */
         UntarCompressionMethod(String value) {
             this.value = value;
         }
     }
 }