/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.runtime.rest.messages.json;

import org.apache.flink.runtime.instance.SlotSharingGroupId;
import org.apache.flink.util.StringUtils;

/** Copied from Flink. Should be removed once the client dependency is upgraded to 1.18. */
public class SlotSharingGroupIdConverter {
    public static SlotSharingGroupId fromHexString(String hexString) {
        var bytes = StringUtils.hexStringToByte(hexString);
        var lowerPart = byteArrayToLong(bytes, 0);
        var upperPart = byteArrayToLong(bytes, 8);

        return new SlotSharingGroupId(lowerPart, upperPart);
    }

    private static long byteArrayToLong(byte[] ba, int offset) {
        long l = 0L;

        for (int i = 0; i < 8; ++i) {
            l |= ((long) ba[offset + 8 - 1 - i] & 255L) << (i << 3);
        }

        return l;
    }
}
