/**
    * Copyright 2011, Aiki IT, FotoRenamer
    * <p/>
    * 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
    * <p/>
    * http://www.apache.org/licenses/LICENSE-2.0
    * <p/>
   * 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 de.aikiit.fotorenamer.image;
  
  import com.google.common.collect.Lists;
  import de.aikiit.fotorenamer.exception.InvalidDirectoryException;
  import de.aikiit.fotorenamer.exception.NoFilesFoundException;
  import de.aikiit.fotorenamer.exception.RenamingErrorException;
  import de.aikiit.fotorenamer.gui.ProgressBar;
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
  
  import javax.swing.*;
  import java.io.File;
  import java.util.Arrays;
  import java.util.List;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import static de.aikiit.fotorenamer.util.LocalizationHelper.getBundleString;
  import static de.aikiit.fotorenamer.util.LocalizationHelper.getParameterizedBundleString;
  
  /**
   * This class rerenames files in order to be able to play them back onto a camera
   * device that is not able to deal with long filenames.
   *
   * @author hirsch, 08.12.2003
   * @version 2004-01-08
   */
  public final class RemoveExifPrefixRenamer implements Runnable {
      private static final Logger LOG =
              LogManager.getLogger(RemoveExifPrefixRenamer.class);
      /**
       * Pattern applied to find already renamed image files.
       * Should match: 20110507_180520_IMG_8192small.JPG
       */
      private static final String REPLACE_PATTERN = "\\d{8}[_]\\d{4}[_]";
  
      private final File currentDirectory;
      private List<File> listOfFiles = Lists.newArrayList();
      private ProgressBar progressBar = null;
      private final AtomicInteger done = new AtomicInteger(0);
  
      /**
       * Main constructor that takes a directory to work on.
       *
       * @param directory Directory to perform operation on.
       * @throws InvalidDirectoryException If directory cannot be accessed
       *                                   properly.
       * @throws NoFilesFoundException     If directory is empty.
       */
      public RemoveExifPrefixRenamer(final String directory)
              throws InvalidDirectoryException, NoFilesFoundException {
          this.currentDirectory = new File(directory);
          checkInputAndInitialize();
          new Thread(this).start();
      }
  
      /**
       * Performs actual renaming/removing of date information from the
       * filenames.
       *
       * @throws RenamingErrorException If any error occurs.
       * @see #checkInputAndInitialize()
       */
      private void rename() throws RenamingErrorException {
          for (final File listOfFile : this.listOfFiles) {
              String name = listOfFile.getName();
              String nameNeu = name.replaceFirst(REPLACE_PATTERN, "");
  
              // count files to be done
              if (!nameNeu.equalsIgnoreCase(name)) {
                  done.incrementAndGet();
              }
  
              // update UI
              this.progressBar.setProgress();
              this.progressBar.setText(name);
              this.progressBar.updateUI();
  
              // rename files only
              if (listOfFile.isFile() && !listOfFile.renameTo(
                      new File(listOfFile.getParent()
                              + File.separatorChar + nameNeu))) {
                  LOG.error("Problem with file " + listOfFile.getName());
                  throw new RenamingErrorException(getParameterizedBundleString("fotorenamer.ui.rerename.error.detail",
                          listOfFile.getName()));
             }
         }
     }
 
     /**
      * Checks whether current UI-configuration is valid in order to perform the
      * renaming itself.
      *
      * @throws NoFilesFoundException     If the directory contains no files.
      * @throws InvalidDirectoryException If the selected directory is not
      *                                   accessible.
      */
     private void checkInputAndInitialize()
             throws NoFilesFoundException, InvalidDirectoryException {
         // valid directory
         if (this.currentDirectory == null || !this.currentDirectory.isDirectory()) {
             throw new InvalidDirectoryException("" + this.currentDirectory);
         }
 
         final File[] files = this.currentDirectory.listFiles(
                 new ImageFilenameFilter());
 
         // files available
         if(files == null || files.length == 0) {
             throw new NoFilesFoundException(this.currentDirectory);
         }
 
         this.listOfFiles = Arrays.asList(files);
     }
 
     /**
      * Updates the UI and performs the renaming. All error handling is done in
      * other methods.
      *
      * @see #rename()
      */
     public final void run() {
         this.progressBar = new ProgressBar(this.listOfFiles.size());
 
         try {
             rename();
         } catch (RenamingErrorException uf) {
             JOptionPane.showMessageDialog(null, getParameterizedBundleString("fotorenamer.ui.rename.error", uf.getMessage()),
                     getBundleString("fotorenamer.ui.rerename.error.title"),
                     JOptionPane.ERROR_MESSAGE);
             return;
         }
         this.progressBar.dispose();
 
         String statusMessage;
         switch(this.done.get()) {
             case 0:
                 statusMessage = getParameterizedBundleString("fotorenamer.ui.rename.success.message.none", this.currentDirectory.getName());
                 break;
             case 1:
                 statusMessage = getParameterizedBundleString("fotorenamer.ui.rename.success.message.one", this.currentDirectory.getName());
                 break;
             default:
                 statusMessage = getParameterizedBundleString("fotorenamer.ui.rename.success.message", this.done, this.listOfFiles.size(), this.currentDirectory.getName());
         }
 
         JOptionPane.showMessageDialog(null, statusMessage, getBundleString("fotorenamer.ui.rerename.success.title"),
                 JOptionPane.INFORMATION_MESSAGE);
     }
 }