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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.rx;

import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicLong;

import org.reactivestreams.Publisher;
import org.redisson.api.RFuture;

import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.FutureListener;
import io.reactivex.Flowable;
import io.reactivex.functions.Action;
import io.reactivex.functions.Consumer;
import io.reactivex.functions.LongConsumer;
import io.reactivex.internal.operators.flowable.FlowableInternalHelper;
import io.reactivex.processors.ReplayProcessor;

/**
 * 
 * @author Nikita Koksharov
 *
 * @param  value type
 */
public abstract class PublisherAdder {

    public abstract RFuture add(Object o);
    
    public Flowable addAll(Publisher c) {
        final Flowable cc = Flowable.fromPublisher(c);
        final ReplayProcessor p = ReplayProcessor.create();
        return p.doOnRequest(new LongConsumer() {
            @Override
            public void accept(long t) throws Exception {
                final AtomicBoolean completed = new AtomicBoolean();
                final AtomicLong values = new AtomicLong();
                final AtomicBoolean lastSize = new AtomicBoolean();
                
                cc.subscribe(new Consumer() {
                    @Override
                    public void accept(V t) throws Exception {
                        values.getAndIncrement();
                        add(t).addListener(new FutureListener() {
                            @Override
                            public void operationComplete(Future future) throws Exception {
                                if (!future.isSuccess()) {
                                    p.onError(future.cause());
                                    return;
                                }
                                
                                if (future.getNow()) {
                                    lastSize.set(true);
                                }
                                if (values.decrementAndGet() == 0 && completed.get()) {
                                    p.onNext(lastSize.get());
                                    p.onComplete();
                                }
                            }
                        });
                    }
                }, new Consumer() {
                    @Override
                    public void accept(Throwable t) throws Exception {
                        p.onError(t);
                    }
                }, new Action() {
                    @Override
                    public void run() throws Exception {
                        completed.set(true);
                        if (values.get() == 0) {
                            p.onNext(lastSize.get());
                            p.onComplete();
                        }
                    }
                }, FlowableInternalHelper.RequestMax.INSTANCE);                
            }
        });
    }

}