package info.frostfs.sdk;

import info.frostfs.sdk.exceptions.ValidationFrostFSException;

import java.nio.ByteBuffer;
import java.util.UUID;

import static info.frostfs.sdk.constants.AppConst.UUID_BYTE_ARRAY_LENGTH;
import static info.frostfs.sdk.constants.ErrorConst.INPUT_PARAM_IS_MISSING_TEMPLATE;
import static info.frostfs.sdk.constants.ErrorConst.WRONG_UUID_SIZE_TEMPLATE;
import static java.util.Objects.isNull;

public class UuidExtension {
    private UuidExtension() {
    }

    public static UUID asUuid(byte[] bytes) {
        if (isNull(bytes) || bytes.length != UUID_BYTE_ARRAY_LENGTH) {
            throw new ValidationFrostFSException(String.format(WRONG_UUID_SIZE_TEMPLATE, UUID_BYTE_ARRAY_LENGTH));
        }

        ByteBuffer bb = ByteBuffer.wrap(bytes);
        long firstLong = bb.getLong();
        long secondLong = bb.getLong();
        return new UUID(firstLong, secondLong);
    }

    public static byte[] asBytes(UUID uuid) {
        if (isNull(uuid)) {
            throw new ValidationFrostFSException(
                    String.format(INPUT_PARAM_IS_MISSING_TEMPLATE, UUID.class.getName())
            );
        }

        ByteBuffer bb = ByteBuffer.allocate(UUID_BYTE_ARRAY_LENGTH);
        bb.putLong(uuid.getMostSignificantBits());
        bb.putLong(uuid.getLeastSignificantBits());
        return bb.array();
    }
}