/*
 * Copyright (c) 2022, ctecinf.com.br
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package br.com.ctecinf.text;

import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.text.ParseException;
import javax.swing.JFormattedTextField;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.DocumentFilter;

/**
 *
 * @author Cássio Conceição
 * @since 01/11/2019
 * @version 2203
 * @see http://ctecinf.com.br/
 */
public class PasswordFormatter extends JFormattedTextField.AbstractFormatter {

    private String password = "";

    private final DocumentFilter df = new DocumentFilter() {

        @Override
        public void replace(DocumentFilter.FilterBypass fb, int offset, int length, String text, AttributeSet attrs) throws BadLocationException {
            password = password.substring(0, offset) + text;
            super.replace(fb, offset, length, "*", attrs);
        }

        @Override
        public void remove(DocumentFilter.FilterBypass fb, int offset, int length) throws BadLocationException {
            password = password.substring(0, offset);
            super.remove(fb, offset, length);
        }
    };

    private String md5(String value) {

        byte[] messageDigest = null;

        try {
            messageDigest = MessageDigest.getInstance("MD5").digest(value.getBytes());
        } catch (NoSuchAlgorithmException ex) {
            System.err.println(ex);
        }

        return new BigInteger(1, messageDigest).toString(16);
    }

    @Override
    public Object stringToValue(String text) throws ParseException {
        return text.isEmpty() ? null : md5(password);
    }

    @Override
    public String valueToString(Object value) throws ParseException {

        if (value == null) {
            return null;
        }

        password = value.toString();

        String pass = "";

        for (int i = 0; i < value.toString().length(); i++) {
            pass += "*";
        }

        return pass;
    }

    @Override
    protected DocumentFilter getDocumentFilter() {
        return df;
    }
}