/*
 * Data Hub Service (DHuS) - For Space data distribution.
 * Copyright (C) 2013,2014,2015 GAEL Systems
 *
 * This file is part of DHuS software sources.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
package fr.gael.dhus.util;

import org.apache.commons.compress.archivers.ArchiveEntry;
import org.apache.commons.compress.archivers.ArchiveException;
import org.apache.commons.compress.archivers.ArchiveInputStream;
import org.apache.commons.compress.archivers.ArchiveStreamFactory;
import org.apache.commons.compress.compressors.CompressorException;
import org.apache.commons.compress.compressors.CompressorInputStream;
import org.apache.commons.compress.compressors.CompressorStreamFactory;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.List;

public class UnZip
{
   private static final Logger LOGGER = LogManager.getLogger(UnZip.class);

   List<String> fileList;

   public static void unCompress (String zip_file, String output_folder)
         throws IOException, CompressorException, ArchiveException
   {
      ArchiveInputStream ais = null;
      ArchiveStreamFactory asf = new ArchiveStreamFactory ();

      FileInputStream fis = new FileInputStream (new File (zip_file));

      if (zip_file.toLowerCase ().endsWith (".tar"))
      {
         ais = asf.createArchiveInputStream (
               ArchiveStreamFactory.TAR, fis);
      }
      else if (zip_file.toLowerCase ().endsWith (".zip"))
      {
         ais = asf.createArchiveInputStream (
               ArchiveStreamFactory.ZIP, fis);
      }
      else if (zip_file.toLowerCase ().endsWith (".tgz") ||
            zip_file.toLowerCase ().endsWith (".tar.gz"))
      {
         CompressorInputStream cis = new CompressorStreamFactory ().
               createCompressorInputStream (CompressorStreamFactory.GZIP, fis);
         ais = asf.createArchiveInputStream (new BufferedInputStream (cis));
      }
      else
      {
         try
         {
            fis.close ();
         }
         catch (IOException e)
         {
            LOGGER.warn ("Cannot close FileInputStream:", e);
         }
         throw new IllegalArgumentException (
               "Format not supported: " + zip_file);
      }

      File output_file = new File (output_folder);
      if (!output_file.exists ()) output_file.mkdirs ();

      // copy the existing entries
      ArchiveEntry nextEntry;
      while ((nextEntry = ais.getNextEntry ()) != null)
      {
         File ftemp = new File (output_folder, nextEntry.getName ());
         if (nextEntry.isDirectory ())
         {
            ftemp.mkdir ();
         }
         else
         {
            FileOutputStream fos = FileUtils.openOutputStream (ftemp);
            IOUtils.copy (ais, fos);
            fos.close ();
         }
      }
      ais.close ();
      fis.close ();
   }

   public static boolean supported (String file)
   {
      boolean is_supported =
            file.toLowerCase ().endsWith (".zip")/* ||
          file.toLowerCase ().endsWith (".tar") ||
          file.toLowerCase ().endsWith (".tgz") ||
          file.toLowerCase ().endsWith (".tar.gz")*/;
      File fileObject = new File (file);
      is_supported &= fileObject.exists () && fileObject.isFile ();
      return is_supported;
   }
}