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/*
 * Copyright (C) 2022 PekinSOFT Systems
 *
 * 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 .
 * 
 * *****************************************************************************
 *  Project    :   AppFramework
 *  Class      :   OptionalEmailVerifier.java
 *  Author     :   Sean Carrick
 *  Created    :   Dec 21, 2022
 *  Modified   :   Dec 21, 2022
 *  
 *  Purpose: See class JavaDoc for explanation
 *  
 *  Revision History:
 *  
 *  WHEN          BY                   REASON
 *  ------------  -------------------  -----------------------------------------
 *  Dec 21, 2022  Sean Carrick         Initial creation.
 * *****************************************************************************
 */

package com.pekinsoft.verifiers;

import java.awt.Color;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.swing.InputVerifier;
import javax.swing.JComponent;
import javax.swing.JLabel;
import javax.swing.UIManager;
import javax.swing.text.JTextComponent;

/**
 *
 * @author Sean Carrick <sean at pekinsoft dot com>
 * 
 * @version 1.3
 * @since 1.0
 */
public class OptionalEmailVerifier extends InputVerifier {
    
    private final JLabel problemLabel;
    private final String errorMessage;
    private final String regex = "^[\\w!#$%&’*+/=?`{|}~^-]+(?:\\.[\\w!#$%&’*+/="
            + "?`{|}~^-]+)*@(?:[a-zA-Z0-9-]+\\.)+[a-zA-Z]{2,6}$";
    private final Pattern pattern;
    private Matcher matcher;
    private Color error = new Color(1.0f, 0.832f, 0.832f);
    
    public OptionalEmailVerifier (JLabel problemLabel, String errorMessage) {
        this.problemLabel = problemLabel;
        this.errorMessage = errorMessage;
        pattern = Pattern.compile(regex);
    }

    @Override
    public boolean verify(JComponent input) {
        boolean valid = true;   // Assume valid
        if (input != null) {
            if (input instanceof JTextComponent) {
                String toVerify = ((JTextComponent) input).getText();
                valid = toVerify.trim().isEmpty();
                
                if (!valid) {
                    matcher = pattern.matcher(toVerify);
                    valid = matcher.matches();
                }
            }
            if (!valid) {
                input.setBackground(error);
                if (problemLabel != null && !errorMessage.trim().isEmpty()) {
                    problemLabel.setText(errorMessage);
                }
            } else {
                Color bg = UIManager.getColor("TextField.background");
                input.setBackground(bg == null ? UIManager.getColor("text") : bg);
                if (problemLabel != null) {
                    problemLabel.setText("");
                }
            }
        }
        
        return valid;
    }

}