package net.sumaris.core.util;
   
   /*-
    * #%L
    * Quadrige3 Core :: Quadrige3 Core Shared
    * $Id:$
    * $HeadURL:$
    * %%
    * Copyright (C) 2017 Ifremer
   * %%
   * This program is free software: you can redistribute it and/or modify
   * it under the terms of the GNU 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 General Public License for more details.
   * 
   * You should have received a copy of the GNU General Public
   * License along with this program.  If not, see
   * <http://www.gnu.org/licenses/gpl-3.0.html>.
   * #L%
   */
  
  
  import org.apache.commons.io.IOUtils;
  import org.springframework.util.StreamUtils;
  
  import java.io.*;
  import java.util.Enumeration;
  import java.util.Objects;
  import java.util.zip.ZipEntry;
  import java.util.zip.ZipFile;
  import java.util.zip.ZipOutputStream;
  
  /**
   * <p>ZipUtils class.</p>
   */
  public class ZipUtils {
  
      /**
       * <p>Constructor for ZipUtils.</p>
       */
      protected ZipUtils() {
          // helper class
      }
  
      /**
       * <p>compressFilesInPath.</p>
       *
       * @param path a {@link String} object.
       * @param compressedFile a {@link File} object.
       * @param deleteAfterCompress a boolean.
       * @throws IOException if any.
       */
      public static void compressFilesInPath(String path, File compressedFile, boolean deleteAfterCompress) throws IOException {
          compressFilesInPath(new File(path), compressedFile, deleteAfterCompress);
      }
  
      /**
       * <p>compressFilesInPath.</p>
       *
       * @param fileSource a {@link File} object.
       * @param compressedFile a {@link File} object.
       * @param deleteAfterCompress a boolean.
       * @throws IOException if any.
       */
      public static void compressFilesInPath(File fileSource, File compressedFile, boolean deleteAfterCompress) throws IOException {
          ZipOutputStream zout = new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(compressedFile)));
          compressDirectory(fileSource, fileSource, compressedFile, zout, deleteAfterCompress);
          zout.close();
      }
  
  
      /**
       * <p>uncompressFileToPath.</p>
       *
       * @param compressedFile a {@link File} object.
       * @param path a {@link String} object.
       * @param deleteAfterUncompress a boolean.
       * @throws IOException if any.
       */
      public static void uncompressFileToPath(File compressedFile, String path, boolean deleteAfterUncompress) throws IOException {
          File destDir;
          if (path != null) {
              destDir = new File(path);
          }
          else {
              destDir = new File(compressedFile.getParent());
          }
          destDir.mkdirs();
  
          ZipFile zipFile = new ZipFile(compressedFile);
          Enumeration<? extends ZipEntry> entries = zipFile.entries();
          while (entries.hasMoreElements()) {
              ZipEntry zipEntry = entries.nextElement();
              if (!zipEntry.isDirectory()) {
                 File destFile = new File(destDir, zipEntry.getName());
                 destFile.getParentFile().mkdirs();
                 OutputStream out = new BufferedOutputStream(new FileOutputStream(destFile));
                 StreamUtils.copy(zipFile.getInputStream(zipEntry), out);
                 out.flush();
                 out.close();
             }
         }
         zipFile.close();
         if (deleteAfterUncompress) {
             compressedFile.delete();
         }
     }
 
     /* -- Internal methods -- */
 
 
     private static void compressDirectory(File rootFileSource, File fileSource, File compressedFile, ZipOutputStream zout, boolean deleteAfterCompress) throws IOException {
         File[] files = fileSource.listFiles();
         for (File file : Objects.requireNonNull(files)) {
             if (file.equals(compressedFile)) {
                 continue;
             }
             if (file.isDirectory()) {
                 String zipEntryName = toZipEntryName(rootFileSource, file);
                 zout.putNextEntry(new ZipEntry(zipEntryName));
                 compressDirectory(rootFileSource, file, compressedFile, zout, deleteAfterCompress);
                 zout.closeEntry();
                 if (deleteAfterCompress) {
                     file.delete();
                 }
                 continue;
             }
             InputStream in = new BufferedInputStream(new FileInputStream(file));
             String zipEntryName = toZipEntryName(rootFileSource, file);
             zout.putNextEntry(new ZipEntry(zipEntryName));
             IOUtils.copy(in, zout);
             zout.closeEntry();
             in.close();
             if (deleteAfterCompress) {
                 file.delete();
             }
         }
     }
 
     private static String toZipEntryName(File root, File file) {
         String result = file.getPath();
         if(root != null) {
             String rootPath = root.getPath();
             if(result.startsWith(rootPath)) {
                 result = result.substring(rootPath.length());
             }
         }
 
         result = result.replace('\\', '/');
         if(file.isDirectory()) {
             result = result + '/';
         }
 
         while(result.startsWith("/")) {
             result = result.substring(1);
         }
 
         return result;
     }
 }