/*
 * 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.message.AddPartitionsToTxnResponseData;
import org.apache.kafka.common.message.AddPartitionsToTxnResponseData.AddPartitionsToTxnPartitionResult;
import org.apache.kafka.common.message.AddPartitionsToTxnResponseData.AddPartitionsToTxnPartitionResultCollection;
import org.apache.kafka.common.message.AddPartitionsToTxnResponseData.AddPartitionsToTxnTopicResult;
import org.apache.kafka.common.message.AddPartitionsToTxnResponseData.AddPartitionsToTxnTopicResultCollection;
import org.apache.kafka.common.protocol.ApiKeys;
import org.apache.kafka.common.protocol.Errors;
import org.apache.kafka.common.protocol.types.Struct;

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

/**
 * Possible error codes:
 *
 *   - {@link Errors#NOT_COORDINATOR}
 *   - {@link Errors#COORDINATOR_NOT_AVAILABLE}
 *   - {@link Errors#COORDINATOR_LOAD_IN_PROGRESS}
 *   - {@link Errors#INVALID_TXN_STATE}
 *   - {@link Errors#INVALID_PRODUCER_ID_MAPPING}
 *   - {@link Errors#INVALID_PRODUCER_EPOCH}
 *   - {@link Errors#TOPIC_AUTHORIZATION_FAILED}
 *   - {@link Errors#TRANSACTIONAL_ID_AUTHORIZATION_FAILED}
 *   - {@link Errors#UNKNOWN_TOPIC_OR_PARTITION}
 */
public class AddPartitionsToTxnResponse extends AbstractResponse {

    public final AddPartitionsToTxnResponseData data;

    private Map<TopicPartition, Errors> cachedErrorsMap = null;

    public AddPartitionsToTxnResponse(Struct struct, short version) {
        this.data = new AddPartitionsToTxnResponseData(struct, version);
    }

    public AddPartitionsToTxnResponse(int throttleTimeMs, Map<TopicPartition, Errors> errors) {

        Map<String, AddPartitionsToTxnPartitionResultCollection> resultMap = new HashMap<>();

        for (Map.Entry<TopicPartition, Errors> entry : errors.entrySet()) {
            TopicPartition topicPartition = entry.getKey();
            String topicName = topicPartition.topic();

            AddPartitionsToTxnPartitionResult partitionResult =
                new AddPartitionsToTxnPartitionResult()
                    .setErrorCode(entry.getValue().code())
                    .setPartitionIndex(topicPartition.partition());

            AddPartitionsToTxnPartitionResultCollection partitionResultCollection = resultMap.getOrDefault(
                topicName, new AddPartitionsToTxnPartitionResultCollection()
            );

            partitionResultCollection.add(partitionResult);
            resultMap.put(topicName, partitionResultCollection);
        }

        AddPartitionsToTxnTopicResultCollection topicCollection = new AddPartitionsToTxnTopicResultCollection();
        for (Map.Entry<String, AddPartitionsToTxnPartitionResultCollection> entry : resultMap.entrySet()) {
            topicCollection.add(new AddPartitionsToTxnTopicResult()
                                    .setName(entry.getKey())
                                    .setResults(entry.getValue()));
        }

        this.data = new AddPartitionsToTxnResponseData()
                        .setThrottleTimeMs(throttleTimeMs)
                        .setResults(topicCollection);
    }

    @Override
    public int throttleTimeMs() {
        return data.throttleTimeMs();
    }

    public Map<TopicPartition, Errors> errors() {
        if (cachedErrorsMap != null) {
            return cachedErrorsMap;
        }

        cachedErrorsMap = new HashMap<>();

        for (AddPartitionsToTxnTopicResult topicResult : this.data.results()) {
            for (AddPartitionsToTxnPartitionResult partitionResult : topicResult.results()) {
                cachedErrorsMap.put(new TopicPartition(
                        topicResult.name(), partitionResult.partitionIndex()),
                    Errors.forCode(partitionResult.errorCode()));
            }
        }
        return cachedErrorsMap;
    }

    @Override
    public Map<Errors, Integer> errorCounts() {
        return errorCounts(errors().values());
    }

    @Override
    protected Struct toStruct(short version) {
        return data.toStruct(version);
    }

    public static AddPartitionsToTxnResponse parse(ByteBuffer buffer, short version) {
        return new AddPartitionsToTxnResponse(ApiKeys.ADD_PARTITIONS_TO_TXN.parseResponse(version, buffer), version);
    }

    @Override
    public String toString() {
        return data.toString();
    }

    @Override
    public boolean shouldClientThrottle(short version) {
        return version >= 1;
    }
}
