/*
    * Copyright 2003 - 2013 The eFaps Team
    *
    * 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.
   *
   * Revision:        $Rev$
   * Last Changed:    $Date$
   * Last Changed By: $Author$
   */
  
  package org.efaps.admin.program.bundle;
  
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.FileNotFoundException;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.util.List;
  import java.util.zip.GZIPOutputStream;
  
  import org.apache.commons.io.FileUtils;
  import org.efaps.admin.AbstractAdminObject;
  import org.efaps.admin.AppConfigHandler;
  import org.efaps.db.Checkout;
  import org.efaps.util.EFapsException;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Makes a bundle of files and zipps them.
   *
   * @author The eFaps Team
   * @version $Id$
   */
  public class TempFileBundle
      implements BundleInterface
  {
  
      /**
       * Name of the folder inside the "official" temporary folder.
       */
      public static final String TMPFOLDERNAME = "eFapsFileBundles";
  
      /**
       * Logging instance used in this class.
       */
      private static final Logger LOG = LoggerFactory.getLogger(AbstractAdminObject.class);
  
      /**
       * Temporary folder.
       */
      private static File TMPFOLDER = new File("");
      static {
          File tmpfld = AppConfigHandler.get().getTempFolder();
          if (tmpfld == null) {
              File temp;
              try {
                  temp = File.createTempFile("eFaps", ".tmp");
                  tmpfld = temp.getParentFile();
                  temp.delete();
              } catch (final IOException e) {
                  TempFileBundle.LOG.error("Cannot create temp file", e);
              }
  
          }
          TempFileBundle.TMPFOLDER = new File(tmpfld, TempFileBundle.TMPFOLDERNAME);
          if (!TempFileBundle.TMPFOLDER.exists()) {
              final boolean mkdir = TempFileBundle.TMPFOLDER.mkdir();
              if (!mkdir) {
                  TempFileBundle.LOG.error("Temp folder was not created");
              }
          }
      }
  
      /**
       * File.
       */
      private File file = null;
  
      /**
       * zipped file.
       */
      private File gzipFile = null;
  
      /**
       * Time in miliseconds when this file was created.
       */
      private final long created;
 
     /**
      * TYpe of the content.
      */
     private String contentType = "text/plain";
 
     /**
      * List of oids included in this bundle.
      */
     private List<String> oids;
 
     /**
      * Key to this bundle.
      */
     private String key;
 
     /**
      * Constructor.
      */
     public TempFileBundle()
     {
         this.created = System.currentTimeMillis();
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public synchronized InputStream getInputStream(final boolean _gziped)
         throws EFapsException
     {
         InputStream ret = null;
         try {
             if (_gziped) {
                 if (this.gzipFile == null  || !this.gzipFile.exists()) {
                     this.gzipFile = setFile(true);
                 }
                 ret = new FileInputStream(this.gzipFile);
             } else {
                 if (this.file == null || !this.file.exists()) {
                     this.file = setFile(false);
                 }
                 ret = new FileInputStream(this.file);
             }
         } catch (final FileNotFoundException e) {
             throw new EFapsException(this.getClass(), "getInputStream", e);
         }
         return ret;
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public long getCreationTime()
     {
         return this.created;
     }
 
     /**
      * This is the getter method for the instance variable {@link #contentType}.
      *
      * @return value of instance variable {@link #contentType}
      */
     @Override
     public String getContentType()
     {
         return this.contentType;
     }
 
     /**
      * This is the setter method for the instance variable {@link #contentType}.
      *
      * @param _contentType the contentType to set
      */
     public void setContentType(final String _contentType)
     {
         this.contentType = _contentType;
     }
 
     /**
      * This is the getter method for the instance variable {@link #oids}.
      *
      * @return value of instance variable {@link #oids}
      */
     public List<String> getOids()
     {
         return this.oids;
     }
 
     /**
      * @param _gziped zip the file
      * @return File
      * @throws EFapsException on error
      */
     private File setFile(final boolean _gziped)
         throws EFapsException
     {
         final String filename = _gziped ? this.key + "GZIP" : this.key;
         final File ret = FileUtils.getFile(TempFileBundle.getTempFolder(), filename);
         try {
             final FileOutputStream out = new FileOutputStream(ret);
             final byte[] buffer = new byte[1024];
             int bytesRead;
             if (_gziped) {
                 final GZIPOutputStream zout = new GZIPOutputStream(out);
                 for (final String oid : this.oids) {
                     final Checkout checkout = new Checkout(oid);
                     final InputStream bis = checkout.execute();
                     while ((bytesRead = bis.read(buffer)) != -1) {
                         zout.write(buffer, 0, bytesRead);
                     }
                 }
                 zout.close();
             } else {
                 for (final String oid : this.oids) {
                     final Checkout checkout = new Checkout(oid);
                     final InputStream bis = checkout.execute();
                     while ((bytesRead = bis.read(buffer)) != -1) {
                         out.write(buffer, 0, bytesRead);
                     }
                 }
             }
             out.close();
         } catch (final IOException e) {
             throw new EFapsException(this.getClass(), "setFile", e, filename);
         }
         return ret;
     }
 
     /**
      * @return the temporary folder
      * @throws EFapsException on error
      */
     public static File getTempFolder()
         throws EFapsException
     {
         return TempFileBundle.TMPFOLDER;
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public void setKey(final String _key,
                        final List<String> _oids)
     {
         this.key = _key;
         this.oids = _oids;
     }
 }