/*
 * PatientView
 *
 * Copyright (c) Worth Solutions Limited 2004-2013
 *
 * This file is part of PatientView.
 *
 * PatientView 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.
 * PatientView 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 PatientView in a file
 * titled COPYING. If not, see <http://www.gnu.org/licenses/>.
 *
 * @package PatientView
 * @link http://www.patientview.org
 * @author PatientView <info@patientview.org>
 * @copyright Copyright (c) 2004-2013, Worth Solutions Limited
 * @license http://www.gnu.org/licenses/gpl-3.0.html The GNU General Public License V3.0
 */

package org.patientview.util;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.StringUtils;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * User: james@solidstategroup.com
 * Date: 12/12/13
 * Time: 11:02
 */
public final class CommonUtils {

    public static final String UK_DATE_FORMAT = "dd-MM-yyyy";

    private static final Logger LOGGER = LoggerFactory.getLogger(CommonUtils.class);

    private static final String DATE_FORMAT_0 = "dd-MM-yy";
    private static final String DATE_FORMAT = "yyyy-MM-dd";
    private static final String[] LENGTH_10_DATE_FORMATS = new String[] {DATE_FORMAT};
    private static final String DATE_FORMAT_1 = "dd.MM.y";
    private static final String DATE_FORMAT_2 = "dd-MM-y";
    private static final String DATE_FORMAT_3 = "dd/MM/y";
    private static final String[] LENGTH_8_DATE_FORMATS = new String[]{DATE_FORMAT_0, DATE_FORMAT_1, DATE_FORMAT_2,
            DATE_FORMAT_3};
    private static final int LENGTH_OF_RADAR_DATES = 8;



    private static final SimpleDateFormat UK_DATE_FORMATTER = new SimpleDateFormat(UK_DATE_FORMAT);

    private CommonUtils() {

    }

    /**
     * Class to return the date from the database text field representation of a date.
     *
     *
     * @param dateField
     * @return
     */
    public static Date parseDate(String dateField) {

        if (StringUtils.hasText(dateField)) {

            // select the dat mask of the length of the field
            String[] dataFormats;
            if (dateField.length() == LENGTH_OF_RADAR_DATES) {
                dataFormats = LENGTH_8_DATE_FORMATS;
            } else {
                dataFormats = LENGTH_10_DATE_FORMATS;
            }

            Date dateOfBirth = null;
            // It seems that the strings in the DB have different date formats, nice.
            for (String dateFormat : dataFormats) {
                try {
                    dateOfBirth = new SimpleDateFormat(dateFormat).parse(dateField);
                    break;
                } catch (ParseException e) {
                    LOGGER.debug("Could not parse date of birth {}", dateField);
                }
            }

            return dateOfBirth;
        }

        return null;
    }

    public static String formatDate(Date date) {

        return UK_DATE_FORMATTER.format(date);
    }
}