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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.TopicPartition;
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 org.apache.kafka.common.utils.CollectionUtils;

import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class FetchResponse extends AbstractRequestResponse {
    public static Schema curSchema = ProtoUtils.currentResponseSchema(ApiKeys.FETCH.id);
    private static String RESPONSES_KEY_NAME = "responses";

    // topic level field names
    private static String TOPIC_KEY_NAME = "topic";
    private static String PARTITIONS_KEY_NAME = "partition_responses";

    // partition level field names
    private static String PARTITION_KEY_NAME = "partition";
    private static String ERROR_CODE_KEY_NAME = "error_code";
    private static String HIGH_WATERMARK_KEY_NAME = "high_watermark";
    private static String RECORD_SET_KEY_NAME = "record_set";

    private final Map responseData;

    public static final class PartitionData {
        public final short errorCode;
        public final long highWatermark;
        public final ByteBuffer recordSet;

        public PartitionData(short errorCode, long highWatermark, ByteBuffer recordSet) {
            this.errorCode = errorCode;
            this.highWatermark = highWatermark;
            this.recordSet = recordSet;
        }
    }

    public FetchResponse(Map responseData) {
        super(new Struct(curSchema));
        Map> topicsData = CollectionUtils.groupDataByTopic(responseData);

        List topicArray = new ArrayList();
        for (Map.Entry> topicEntry: topicsData.entrySet()) {
            Struct topicData = struct.instance(RESPONSES_KEY_NAME);
            topicData.set(TOPIC_KEY_NAME, topicEntry.getKey());
            List partitionArray = new ArrayList();
            for (Map.Entry partitionEntry : topicEntry.getValue().entrySet()) {
                PartitionData fetchPartitionData = partitionEntry.getValue();
                Struct partitionData = topicData.instance(PARTITIONS_KEY_NAME);
                partitionData.set(PARTITION_KEY_NAME, partitionEntry.getKey());
                partitionData.set(ERROR_CODE_KEY_NAME, fetchPartitionData.errorCode);
                partitionData.set(HIGH_WATERMARK_KEY_NAME, fetchPartitionData.highWatermark);
                partitionData.set(RECORD_SET_KEY_NAME, fetchPartitionData.recordSet);
                partitionArray.add(partitionData);
            }
            topicData.set(PARTITIONS_KEY_NAME, partitionArray.toArray());
            topicArray.add(topicData);
        }
        struct.set(RESPONSES_KEY_NAME, topicArray.toArray());
        this.responseData = responseData;
    }

    public FetchResponse(Struct struct) {
        super(struct);
        responseData = new HashMap();
        for (Object topicResponseObj : struct.getArray(RESPONSES_KEY_NAME)) {
            Struct topicResponse = (Struct) topicResponseObj;
            String topic = topicResponse.getString(TOPIC_KEY_NAME);
            for (Object partitionResponseObj : topicResponse.getArray(PARTITIONS_KEY_NAME)) {
                Struct partitionResponse = (Struct) partitionResponseObj;
                int partition = partitionResponse.getInt(PARTITION_KEY_NAME);
                short errorCode = partitionResponse.getShort(ERROR_CODE_KEY_NAME);
                long highWatermark = partitionResponse.getLong(HIGH_WATERMARK_KEY_NAME);
                ByteBuffer recordSet = partitionResponse.getBytes(RECORD_SET_KEY_NAME);
                PartitionData partitionData = new PartitionData(errorCode, highWatermark, recordSet);
                responseData.put(new TopicPartition(topic, partition), partitionData);
            }
        }
    }

    public Map responseData() {
        return responseData;
    }

    public static FetchResponse parse(ByteBuffer buffer) {
        return new FetchResponse(((Struct) curSchema.read(buffer)));
    }
}