/*
 * This file is part of ToolStats.
 *
 * ToolStats 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.
 *
 * ToolStats 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 ToolStats.  If not, see <https://www.gnu.org/licenses/>.
 */

package lol.hyper.toolstats.tools;

import lol.hyper.toolstats.ToolStats;
import org.bukkit.Material;

import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.UUID;

public class HashMaker {

    private final ToolStats toolStats;

    public HashMaker(ToolStats toolStats) {
        this.toolStats = toolStats;
    }

    public String makeHash(Material itemType, UUID player, long timestamp) {
        String input = itemType.toString() + player.toString() + timestamp;

        try {
            MessageDigest md = MessageDigest.getInstance("SHA-256");
            byte[] hashBytes = md.digest(input.getBytes(StandardCharsets.UTF_8));

            StringBuilder hexString = new StringBuilder();
            for (byte b : hashBytes) {
                String hex = Integer.toHexString(0xff & b);
                if (hex.length() == 1) {
                    hexString.append('0');
                }
                hexString.append(hex);
            }

            return hexString.toString();
        } catch (NoSuchAlgorithmException exception) {
            toolStats.logger.warning("Unable to generate hash for " + player + "!");
            toolStats.logger.warning("Generating a random UUID instead.");
            exception.printStackTrace();
            return java.util.UUID.randomUUID().toString();
        }
    }
}