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/**
 * Copyright 2019 Expedia, Inc.
 *
 * Licensed 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 com.expediagroup.rhapsody.kafka.factory;

import java.util.Collection;
import java.util.function.Function;

import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.reactivestreams.Publisher;

import com.expediagroup.rhapsody.api.Acknowledgeable;
import com.expediagroup.rhapsody.core.transformer.AutoAcknowledgementConfig;
import com.expediagroup.rhapsody.kafka.acknowledgement.ReceiverAcknowledgementStrategy;

import reactor.core.publisher.Flux;

public class KafkaValueFluxFactory extends KafkaFluxFactory {

    public KafkaValueFluxFactory(KafkaConfigFactory configFactory) {
        super(configFactory);
    }

    public Flux> receiveAutoGroupValue(Collection topics,
        AutoAcknowledgementConfig autoAcknowledgementConfig,
        Function>, ? extends Publisher>> pregroup) {
        return receiveAutoGroup(topics, autoAcknowledgementConfig, pregroup).map(this::extractNonNullValues);
    }

    public Flux receiveAutoValue(Collection topics, AutoAcknowledgementConfig autoAcknowledgementConfig) {
        return receiveAuto(topics, autoAcknowledgementConfig).transform(this::extractNonNullValues);
    }

    public Flux>> receiveGroupValue(Collection topics,
        ReceiverAcknowledgementStrategy receiverAcknowledgementStrategy,
        Function>>, ? extends Publisher>>> pregroup) {
        return receiveGroup(topics, receiverAcknowledgementStrategy, pregroup).map(this::extractAcknowledgeableNonNullValues);
    }

    public Flux> receiveValue(Collection topics) {
        return receive(topics).transform(this::extractAcknowledgeableNonNullValues);
    }

    public Flux> receiveValue(Collection topics, ReceiverAcknowledgementStrategy receiverAcknowledgementStrategy) {
        return receive(topics, receiverAcknowledgementStrategy).transform(this::extractAcknowledgeableNonNullValues);
    }

    private Flux extractNonNullValues(Flux> consumerRecords) {
        return consumerRecords.filter(consumerRecord -> consumerRecord.value() != null).map(ConsumerRecord::value);
    }

    private Flux> extractAcknowledgeableNonNullValues(Flux>> acknowledgeables) {
        return acknowledgeables
            .filter(Acknowledgeable.filtering(consumerRecord -> consumerRecord.value() != null, Acknowledgeable::acknowledge))
            .map(Acknowledgeable.mapping(ConsumerRecord::value));
    }
}