/*
  fm - File management class library
  Copyright (C) 2024, 2025  Ulrich Hilger

  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 <https://www.gnu.org/licenses/>.
 */
package de.uhilger.fm;

import java.io.File;
import java.io.IOException;
import java.nio.file.DirectoryStream;
import java.nio.file.Files;
import java.nio.file.Path;
import net.coobird.thumbnailator.Thumbnails;

/**
 * Rotieren von Bilddateien
 * 
 * @author Ulrich Hilger
 * @version 0.1, 12.03.2025
 */
public class Rotor {
  
  /**
   * Eine Bilddatei mit allen Varianten rotieren
   * 
   * Fuer jede Datei mit Endung jpg, jpeg und png werden alle Varianten wie zum Beispiel 
   * dateiname.jpg, dateiname_kl.jpg, dateiname_gr.jpg, dateiname_gr_b64.jpg usw.beruecksichtigt, 
   * also dateiname*.jpg.
   * 
   * @param srcFile die Bilddatei, deren Varianten beruecksichtigt werden sollen
   * @param rotation Rotation in Grad, negative Werte rotieren gegen den Uhrzeigersinn
   * @throws IOException wenn etwas schief geht
   */
  public void rotateImgFiles(File srcFile, int rotation) throws IOException {
    String fnameext = srcFile.getName();
    int dotpos = fnameext.lastIndexOf(".");
    String fname = fnameext.substring(0, dotpos);
    String ext = fnameext.substring(dotpos);
    DirectoryStream<Path> stream = Files.newDirectoryStream(srcFile.getParentFile().toPath(), 
            fname + "*" + ext); 
    for (Path path : stream) {
      File file = path.toFile();
                Thumbnails.of(file)
                  .scale(1.0)
                  .rotate(rotation)
                  .toFile(file);        
    }
    stream.close();
  }
}