/*
 * Copyright (C) 2008-2017, Juick
 *
 * This program 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 com.juick.util;

import org.apache.commons.lang3.StringUtils;

import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;
import java.util.Locale;

/**
 * Created by aalexeev on 12/7/16.
 */
public class DateFormatter {
    private final DateTimeFormatter formatter;

    public DateFormatter(String pattern) {
        formatter = DateTimeFormatter.ofPattern(pattern, Locale.ENGLISH);
    }

    public String format(final Instant ts) {
        if (ts == null)
            return null;

        LocalDateTime ldt = LocalDateTime.ofInstant(ts, ZoneOffset.UTC);

        return ldt.format(formatter);
    }


    public Instant parse(final String v) {
        if (StringUtils.isBlank(v))
            return null;

        LocalDateTime ldt = LocalDateTime.parse(v, formatter);

        return ldt.toInstant(ZoneOffset.UTC);
    }
}