/*
 * This file is part of Araknemu.
 *
 * Araknemu is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Araknemu 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Araknemu.  If not, see <https://www.gnu.org/licenses/>.
 *
 * Copyright (c) 2017-2020 Vincent Quatrevieux
 */

package fr.quatrevieux.araknemu.data.living.transformer;

import fr.quatrevieux.araknemu.data.transformer.Transformer;
import fr.quatrevieux.araknemu.data.transformer.TransformerException;
import org.checkerframework.checker.nullness.qual.PolyNull;

import java.time.Instant;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

/**
 * Transformer for parse an {@link Instant} value from database
 * Use the SQL standard format "yyyy-MM-dd HH:mm:ss"
 */
public final class InstantTransformer implements Transformer<Instant> {
    private final DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss").withZone(ZoneOffset.UTC);

    @Override
    public @PolyNull String serialize(@PolyNull Instant value) {
        return value == null ? null : formatter.format(value);
    }

    @Override
    public @PolyNull Instant unserialize(@PolyNull String serialize) throws TransformerException {
        return serialize == null ? null : formatter.parse(serialize, Instant::from);
    }
}