/*
 * Copyright (C) 2016 Christian Pierre Momon <christian.momon@devinsy.fr>
 * 					  Didier Clermonté <dclermonte@april.org>
 *
 * 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.gui;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileReader;
import java.io.IOException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.filechooser.FileNameExtensionFilter;

import com.jgoodies.forms.layout.ColumnSpec;
import com.jgoodies.forms.layout.FormLayout;
import com.jgoodies.forms.layout.FormSpecs;
import com.jgoodies.forms.layout.RowSpec;
import com.jgoodies.forms.layout.Sizes;
import java.util.ResourceBundle;

/**
 *
 * @author papa
 */
public class CheckPanel extends JPanel
{
	private static final ResourceBundle BUNDLE = ResourceBundle.getBundle("org.dclermonte.siba.gui.messages"); //$NON-NLS-1$
	private static final long serialVersionUID = -1580485684838045920L;
	private JTextField textField;
	private File choosenFile;

	/**
	 * Create the panel.
	 */
	public CheckPanel()
	{
		setLayout(new FormLayout(
				new ColumnSpec[] { ColumnSpec.decode("2dlu"),
						new ColumnSpec(ColumnSpec.LEFT,
								Sizes.bounded(Sizes.PREFERRED, Sizes.constant("50dlu", true),
										Sizes.constant("60dlu", true)),
								1),
						new ColumnSpec(ColumnSpec.LEFT,
								Sizes.bounded(Sizes.PREFERRED, Sizes.constant("50dlu", true),
										Sizes.constant("100dlu", true)),
								1),
						ColumnSpec.decode("30dlu"), },
				new RowSpec[] { FormSpecs.LINE_GAP_ROWSPEC, RowSpec.decode("25px"), FormSpecs.RELATED_GAP_ROWSPEC,
						FormSpecs.DEFAULT_ROWSPEC, }));

		JLabel lblNewLabel = new JLabel(BUNDLE.getString("CheckPanel.lblNewLabel.text")); //$NON-NLS-1$
		add(lblNewLabel, "2, 2, left, center");

		JButton btnNewButton = new JButton(BUNDLE.getString("CheckPanel.btnNewButton.text")); //$NON-NLS-1$
		btnNewButton.addActionListener(new ActionListener()
		{
			@Override
			public void actionPerformed(final ActionEvent e)
			{
				try
				{
					choosenDirectory();
				}
				catch (IOException e1)
				{
					// TODO Auto-generated catch block
					e1.printStackTrace();
				}
				catch (NoSuchAlgorithmException e1)
				{
					// TODO Auto-generated catch block
					e1.printStackTrace();
				}
			}
		});

		this.textField = new JTextField();
		add(this.textField, "3, 2, fill, default");
		this.textField.setColumns(10);
		add(btnNewButton, "4, 2, left, top");

		JButton btnNewButton_1 = new JButton(BUNDLE.getString("CheckPanel.btnNewButton_1.text")); //$NON-NLS-1$
		btnNewButton_1.addActionListener(new ActionListener()
		{
			@Override
			public void actionPerformed(final ActionEvent arg0)
			{
				try
				{
					check();
				}
				catch (NoSuchAlgorithmException e)
				{
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
				catch (IOException e)
				{
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		});
		add(btnNewButton_1, "3, 4");

	}

	final void check() throws IOException, NoSuchAlgorithmException
	{
		FileReader fileReader = new FileReader(this.choosenFile);
		char[] md5 = new char[32];
		byte[] md5byte = new byte[32];
		char[] fileToCheck = new char[(int) (this.choosenFile.length()) - 32];
		String md5String = new String();
		for (int index = 0; index < 32; index++)
		{
			md5[index] = (char) fileReader.read();
			md5byte[index] = (byte) md5[index];
			md5String = md5String + md5[index];
		}
		fileReader.read();
		String fileNameToString = new String();
		for (int index = 36; index < (this.choosenFile.length() + 2); index++)
		{
			fileToCheck[index - 36] = (char) fileReader.read();
			fileNameToString = fileNameToString + fileToCheck[index - 36];
		}

		fileReader.close();
		File fileToCheck1 = new File(this.choosenFile.getParent() + "/" + fileNameToString);
		byte[] bytedirectoryToSave = new byte[(int) fileToCheck1.length()];
		FileInputStream fileInputStream = new FileInputStream(fileToCheck1);
		for (int index1 = 0; index1 < (fileToCheck1.length()); index1++)
		{
			bytedirectoryToSave[index1] = (byte) fileInputStream.read();
		}
		fileInputStream.close();
		byte[] hash = null;
		StringBuilder hashString = new StringBuilder();
		MessageDigest messageDigest = MessageDigest.getInstance("MD5");
		hash = messageDigest.digest(bytedirectoryToSave);
		for (int index = 0; index < hash.length; index++)
		{
			String hex = Integer.toHexString(hash[index]);
			if (hex.length() == 1)
			{
				hashString.append('0');
				hashString.append(hex.charAt(hex.length() - 1));
			}
			else
			{
				hashString.append(hex.substring(hex.length() - 2));
			}
		}

		if (md5String.equals(hashString.toString()))
		{
			CheckDialog.main("Vérification OK");

		}
		else
		{
			CheckDialog.main("Il y a une erreur");
		}
	}

	/**
	 *
	 * @throws IOException
	 * @throws NoSuchAlgorithmException
	 */
	final void choosenDirectory() throws IOException, NoSuchAlgorithmException
	{
		final JFileChooser fc = new JFileChooser();
		FileNameExtensionFilter filter = new FileNameExtensionFilter("Fichiers md5", "md5");
		fc.setAcceptAllFileFilterUsed(false);
		fc.addChoosableFileFilter(filter);
		fc.setFileSelectionMode(JFileChooser.FILES_ONLY);

		int returnVal = fc.showDialog(CheckPanel.this, "Sauvegarde à vérifier");

		if (returnVal == JFileChooser.APPROVE_OPTION)
		{
			this.choosenFile = fc.getSelectedFile();
			this.textField.setText(this.choosenFile.getName());
		}
	}

}