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/**
 * Copyright 2018 Nikita Koksharov
 *
 * 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 org.redisson.reactive;

import java.util.concurrent.atomic.AtomicLong;
import java.util.function.Consumer;
import java.util.function.LongConsumer;

import org.redisson.api.RFuture;
import org.redisson.client.RedisClient;
import org.redisson.client.protocol.decoder.ListScanResult;

import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.FutureListener;
import reactor.core.publisher.FluxSink;

/**
 * 
 * @author Nikita Koksharov
 *
 * @param  value type
 */
public abstract class SetReactiveIterator implements Consumer> {

    @Override
    public void accept(FluxSink emitter) {
        emitter.onRequest(new LongConsumer() {
            
            private long nextIterPos;
            private RedisClient client;
            private AtomicLong elementsRead = new AtomicLong();
            
            private boolean finished;
            private volatile boolean completed;
            private AtomicLong readAmount = new AtomicLong();
            
            @Override
            public void accept(long value) {
                readAmount.addAndGet(value);
                if (completed || elementsRead.get() == 0) {
                    nextValues(emitter);
                    completed = false;
                }
            }
            
            protected void nextValues(FluxSink emitter) {
                scanIterator(client, nextIterPos).addListener(new FutureListener>() {
                    @Override
                    public void operationComplete(Future> future) throws Exception {
                        if (!future.isSuccess()) {
                            emitter.error(future.cause());
                            return;
                        }
                        
                        if (finished) {
                            client = null;
                            nextIterPos = 0;
                            return;
                        }

                        ListScanResult