/*
 * 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.kafka.server.common;

import java.util.HashMap;
import java.util.Map;
import java.util.Objects;

public record FinalizedFeatures(
    MetadataVersion metadataVersion,
    Map<String, Short> finalizedFeatures,
    long finalizedFeaturesEpoch
) {
    public static FinalizedFeatures fromKRaftVersion(MetadataVersion version) {
        return new FinalizedFeatures(version, Map.of(), -1);
    }

    public FinalizedFeatures(
        MetadataVersion metadataVersion,
        Map<String, Short> finalizedFeatures,
        long finalizedFeaturesEpoch
    ) {
        this.metadataVersion = Objects.requireNonNull(metadataVersion);
        this.finalizedFeatures = new HashMap<>(finalizedFeatures);
        this.finalizedFeaturesEpoch = finalizedFeaturesEpoch;
        this.finalizedFeatures.put(MetadataVersion.FEATURE_NAME, metadataVersion.featureLevel());
    }

    public FinalizedFeatures setFinalizedLevel(String key, short level) {
        if (level == (short) 0) {
            if (finalizedFeatures.containsKey(key)) {
                Map<String, Short> newFinalizedFeatures = new HashMap<>(finalizedFeatures);
                newFinalizedFeatures.remove(key);
                return new FinalizedFeatures(
                    metadataVersion,
                    newFinalizedFeatures,
                    finalizedFeaturesEpoch);
            } else {
                return this;
            }
        } else {
            Map<String, Short> newFinalizedFeatures = new HashMap<>(finalizedFeatures);
            newFinalizedFeatures.put(key, level);
            return new FinalizedFeatures(
                metadataVersion,
                newFinalizedFeatures,
                finalizedFeaturesEpoch);
        }
    }
}
