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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.common.requests;

import org.apache.kafka.common.protocol.ApiKeys;
import org.apache.kafka.common.protocol.ProtoUtils;
import org.apache.kafka.common.protocol.types.Schema;
import org.apache.kafka.common.protocol.types.Struct;

import java.nio.ByteBuffer;

public class SyncGroupResponse extends AbstractRequestResponse {

    private static final Schema CURRENT_SCHEMA = ProtoUtils.currentResponseSchema(ApiKeys.SYNC_GROUP.id);
    public static final String ERROR_CODE_KEY_NAME = "error_code";
    public static final String MEMBER_ASSIGNMENT_KEY_NAME = "member_assignment";

    /**
     * Possible error codes:
     *
     * GROUP_COORDINATOR_NOT_AVAILABLE (15)
     * NOT_COORDINATOR_FOR_GROUP (16)
     * ILLEGAL_GENERATION (22)
     * UNKNOWN_MEMBER_ID (25)
     * REBALANCE_IN_PROGRESS (27)
     * GROUP_AUTHORIZATION_FAILED (30)
     */

    private final short errorCode;
    private final ByteBuffer memberState;

    public SyncGroupResponse(short errorCode, ByteBuffer memberState) {
        super(new Struct(CURRENT_SCHEMA));

        struct.set(ERROR_CODE_KEY_NAME, errorCode);
        struct.set(MEMBER_ASSIGNMENT_KEY_NAME, memberState);

        this.errorCode = errorCode;
        this.memberState = memberState;
    }

    public SyncGroupResponse(Struct struct) {
        super(struct);

        this.errorCode = struct.getShort(ERROR_CODE_KEY_NAME);
        this.memberState = struct.getBytes(MEMBER_ASSIGNMENT_KEY_NAME);
    }

    public short errorCode() {
        return errorCode;
    }

    public ByteBuffer memberAssignment() {
        return memberState;
    }

    public static SyncGroupResponse parse(ByteBuffer buffer) {
        return new SyncGroupResponse(CURRENT_SCHEMA.read(buffer));
    }

}