/*
 * Copyright (C) 2016 Didier Clermonté <dclermonte@april.org>
 * Copyright (C) 2016 Christian Pierre Momon <christian.momon@devinsy.fr>
 *
 * This file is part of Siba.
 *
 * Siba 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 <http://www.gnu.org/licenses/>.
 */
package org.dclermonte.siba.model;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.security.NoSuchAlgorithmException;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.ResourceBundle;

import org.apache.commons.compress.archivers.tar.TarArchiveOutputStream;
import org.apache.commons.compress.compressors.gzip.GzipCompressorOutputStream;
import org.apache.commons.compress.utils.IOUtils;
import org.apache.commons.lang3.StringUtils;
import org.dclermonte.siba.SibaException;

/**
 *
 * @author Didier Clermonté (dclermonte@april.org)
 *
 */
public final class SibaManager
{
	private static final ResourceBundle BUNDLE = ResourceBundle.getBundle("org.dclermonte.siba.model.messages"); //$NON-NLS-1$

	private SibaManager()
	{

	}

	/**
	 * This method perform the backup.
	 *
	 * @param fileToSave
	 *            name of the directory to save
	 * @return the archive of the file
	 * @throws SibaException
	 *             specific exception for Siba
	 */
	public static File backup(final File fileToSave) throws SibaException
	{
		File result;

		File target = new File(System.getProperty("user.dir"));
		result = backup(fileToSave, target);

		//
		return result;
	}

	/**
	 * This method perform the backup.
	 *
	 * @param fileToSave
	 *            name of the directory to save
	 * @param target
	 *            directory for the file
	 * @return the archive of the file
	 * @throws SibaException
	 *             specific exception
	 */
	public static File backup(final File fileToSave, final File target) throws SibaException
	{
		File result;

		TarArchiveOutputStream out = null;
		try
		{
			if ((fileToSave == null) || !fileToSave.exists())
			{
				throw new SibaException(BUNDLE.getString("sourceNotExist.text"));
			}
			else if (!fileToSave.isDirectory())
			{
				throw new SibaException(BUNDLE.getString("NotDirectorySource.text"));
			}
			else if (!target.isDirectory())
			{
				throw new SibaException(BUNDLE.getString("NotDirectoryTarget.text"));
			}
			else
			{
				LocalDateTime date = LocalDateTime.now();
				DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH'h'mm'mn'ss's'");
				String textDate = date.format(formatter);
				String outputFileNameWithoutExtension = fileToSave.getName() + "-" + textDate;
				result = new File(target + "/" + outputFileNameWithoutExtension + ".tgz");
				OutputStream gzipOutputStream = new GzipCompressorOutputStream(
						new BufferedOutputStream(new FileOutputStream(result)));
				out = new TarArchiveOutputStream(gzipOutputStream);
				SibaUtils.tarDirectoryTree(fileToSave, out);
				out.close();
				SibaUtils.createMD5File(result, target + "/" + outputFileNameWithoutExtension + ".tgz.md5");
			}
		}
		catch (IOException exception)
		{
			throw new SibaException(BUNDLE.getString("ioExceptionBackup.text"), exception); //$NON-NLS-1$
		}
		catch (NoSuchAlgorithmException exception)
		{
			throw new SibaException(BUNDLE.getString("noSuchAlgorithm.text"), exception); //$NON-NLS-1$
		}
		finally
		{
			IOUtils.closeQuietly(out);
		}

		//
		return result;
	}

	/**
	 * This method is used to check the file.
	 *
	 * @param choosenFile
	 *            the file to check
	 * @return the result of check
	 * @throws SibaException
	 *             specific exception
	 */
	public static boolean check(final File choosenFile) throws SibaException
	{
		boolean result;

		try
		{
			String md5String = SibaUtils.loadMD5Sum(choosenFile);
			File fileToCheck1 = SibaUtils.readFileNameToCheck(choosenFile);
			if (StringUtils.equals(md5String, SibaUtils.md5(fileToCheck1)))
			{
				result = true;
			}
			else
			{
				result = false;
			}
		}
		catch (IOException exception)
		{
			throw new SibaException(BUNDLE.getString("ioExceptionCheck.text"), exception); //$NON-NLS-1$
		}
		catch (NoSuchAlgorithmException exception)
		{
			throw new SibaException(BUNDLE.getString("noSuchAlgorithm.text"), exception); //$NON-NLS-1$
		}

		//
		return result;
	}

}