/**
 *
 * 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 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 org.iq80.snappy.SnappyFramedInputStream;

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;
        }
    }
}
