/**

 * copy-image-resizer

 * Copyright © 2014 František Kučera (frantovo.cz)

 *

 * 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/>.

 */

package cz.frantovo.copyImageResizer;

import cz.frantovo.copyImageResizer.SingleImageResizer.ImageFormat;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.util.logging.Level;

import java.util.logging.Logger;

/**

 *

 * @author Ing. František Kučera (frantovo.cz)

 */

public class RecursiveImageResizer {

	private static final Logger log = Logger.getLogger(RecursiveImageResizer.class.getName());

	private final SingleImageResizer resizer = new SingleImageResizer();

	public void resize(RecursiveOptions options) throws RecursiveException, ResizeException {

		resizeDirectory(options.getInput(), options);

	}

	private void resizeFile(File file, RecursiveOptions options) throws ResizeException {

		log.log(Level.FINE, "Resizing file: {0}", relativize(options.getInput(), file));

		ImageFormat format = ImageFormat.getMatching(file.getName());

		if (format == null) {

			log.log(Level.FINE, "Skipping file: {0} (no image format matched this extension)", relativize(options.getInput(), file));

		} else {

			try {

				FileInputStream input = new FileInputStream(file);

				File relative = relativize(options.getInput(), file);

				File outputFile = new File(options.getOutput(), relative.getPath());

				FileOutputStream output = new FileOutputStream(outputFile);

				resizer.resize(input, output, format);

			} catch (FileNotFoundException e) {

				throw new ResizeException("Error while opening stream", e);

			}

		}

	}

	private void resizeDirectory(File directory, RecursiveOptions options) throws ResizeException {

		log.log(Level.FINE, "Resizing directory: {0}", directory);

		File relative = relativize(options.getInput(), directory);

		File output = new File(options.getOutput(), relative.getPath());

		output.mkdirs();

		for (File entry : directory.listFiles()) {

			if (entry.isDirectory()) {

				resizeDirectory(entry, options);

			} else {

				resizeFile(entry, options);

			}

		}

	}

	private static File relativize(File root, File child) {

		return root.toPath().relativize(child.toPath()).toFile();

	}

}