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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.List;
import java.util.Map;

/**
 * This wrapper supports both v0 and v1 of OffsetFetchRequest.
 */
public class OffsetFetchRequest extends AbstractRequestResponse {
    public static Schema curSchema = ProtoUtils.currentRequestSchema(ApiKeys.OFFSET_FETCH.id);
    private static String GROUP_ID_KEY_NAME = "group_id";
    private static String TOPICS_KEY_NAME = "topics";

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

    // partition level field names
    private static String PARTITION_KEY_NAME = "partition";

    public static final int DEFAULT_GENERATION_ID = -1;
    public static final String DEFAULT_CONSUMER_ID = "";

    private final String groupId;
    private final List partitions;

    public OffsetFetchRequest(String groupId, List partitions) {
        super(new Struct(curSchema));

        Map> topicsData = CollectionUtils.groupDataByTopic(partitions);

        struct.set(GROUP_ID_KEY_NAME, groupId);
        List topicArray = new ArrayList();
        for (Map.Entry> entries: topicsData.entrySet()) {
            Struct topicData = struct.instance(TOPICS_KEY_NAME);
            topicData.set(TOPIC_KEY_NAME, entries.getKey());
            List partitionArray = new ArrayList();
            for (Integer partiitonId : entries.getValue()) {
                Struct partitionData = topicData.instance(PARTITIONS_KEY_NAME);
                partitionData.set(PARTITION_KEY_NAME, partiitonId);
                partitionArray.add(partitionData);
            }
            topicData.set(PARTITIONS_KEY_NAME, partitionArray.toArray());
            topicArray.add(topicData);
        }
        struct.set(TOPICS_KEY_NAME, topicArray.toArray());
        this.groupId = groupId;
        this.partitions = partitions;
    }

    public OffsetFetchRequest(Struct struct) {
        super(struct);
        partitions = new ArrayList();
        for (Object topicResponseObj : struct.getArray(TOPICS_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);
                partitions.add(new TopicPartition(topic, partition));
            }
        }
        groupId = struct.getString(GROUP_ID_KEY_NAME);
   }

    public String groupId() {
        return groupId;
    }

    public List partitions() {
        return partitions;
    }

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