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/*
 * 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.clients.consumer.internals;

import org.apache.kafka.clients.GroupRebalanceConfig;
import org.apache.kafka.common.requests.JoinGroupRequest;
import org.apache.kafka.common.requests.OffsetCommitRequest;

import java.util.Objects;
import java.util.Optional;

public class GroupState {
    public final String groupId;
    public final Optional groupInstanceId;
    public Generation generation = Generation.NO_GENERATION;

    public GroupState(String groupId, Optional groupInstanceId) {
        this.groupId = groupId;
        this.groupInstanceId = groupInstanceId;
    }

    public GroupState(final GroupRebalanceConfig config) {
        this.groupId = config.groupId;
        this.groupInstanceId = config.groupInstanceId;
    }

    protected static class Generation {
        public static final Generation NO_GENERATION = new Generation(
                OffsetCommitRequest.DEFAULT_GENERATION_ID,
                JoinGroupRequest.UNKNOWN_MEMBER_ID,
                null);

        public final int generationId;
        public final String memberId;
        public final String protocolName;

        public Generation(int generationId, String memberId, String protocolName) {
            this.generationId = generationId;
            this.memberId = memberId;
            this.protocolName = protocolName;
        }

        /**
         * @return true if this generation has a valid member id, false otherwise. A member might have an id before
         * it becomes part of a group generation.
         */
        public boolean hasMemberId() {
            return !memberId.isEmpty();
        }

        @Override
        public boolean equals(final Object o) {
            if (this == o) return true;
            if (o == null || getClass() != o.getClass()) return false;
            final Generation that = (Generation) o;
            return generationId == that.generationId &&
                    Objects.equals(memberId, that.memberId) &&
                    Objects.equals(protocolName, that.protocolName);
        }

        @Override
        public int hashCode() {
            return Objects.hash(generationId, memberId, protocolName);
        }

        @Override
        public String toString() {
            return "Generation{" +
                    "generationId=" + generationId +
                    ", memberId='" + memberId + '\'' +
                    ", protocol='" + protocolName + '\'' +
                    '}';
        }
    }
}