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/**
 * Copyright (c) 2013-2021 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 com.github.lontime.shaded.org.redisson.pubsub;

import com.github.lontime.shaded.org.redisson.PubSubEntry;
import com.github.lontime.shaded.org.redisson.client.BaseRedisPubSubListener;
import com.github.lontime.shaded.org.redisson.client.ChannelName;
import com.github.lontime.shaded.org.redisson.client.RedisPubSubListener;
import com.github.lontime.shaded.org.redisson.client.codec.LongCodec;
import com.github.lontime.shaded.org.redisson.client.protocol.pubsub.PubSubType;

import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

/**
 * 
 * @author Nikita Koksharov
 *
 */
abstract class PublishSubscribe> {

    private final ConcurrentMap entries = new ConcurrentHashMap<>();
    private final PublishSubscribeService service;

    PublishSubscribe(PublishSubscribeService service) {
        super();
        this.service = service;
    }

    public void unsubscribe(E entry, String entryName, String channelName) {
        AsyncSemaphore semaphore = service.getSemaphore(new ChannelName(channelName));
        semaphore.acquire(() -> {
            if (entry.release() == 0) {
                entries.remove(entryName);
                service.unsubscribe(PubSubType.UNSUBSCRIBE, new ChannelName(channelName))
                        .whenComplete((r, e) -> {
                            semaphore.release();
                        });
            } else {
                semaphore.release();
            }
        });

    }

    public void timeout(CompletableFuture promise) {
        service.timeout(promise);
    }

    public void timeout(CompletableFuture promise, long timeout) {
        service.timeout(promise, timeout);
    }

    public CompletableFuture subscribe(String entryName, String channelName) {
        AsyncSemaphore semaphore = service.getSemaphore(new ChannelName(channelName));
        CompletableFuture newPromise = new CompletableFuture<>();

        semaphore.acquire(() -> {
            if (newPromise.isDone()) {
                semaphore.release();
                return;
            }

            E entry = entries.get(entryName);
            if (entry != null) {
                entry.acquire();
                semaphore.release();
                entry.getPromise().whenComplete((r, e) -> {
                    if (e != null) {
                        newPromise.completeExceptionally(e);
                        return;
                    }
                    newPromise.complete(r);
                });
                return;
            }

            E value = createEntry(newPromise);
            value.acquire();

            E oldValue = entries.putIfAbsent(entryName, value);
            if (oldValue != null) {
                oldValue.acquire();
                semaphore.release();
                oldValue.getPromise().whenComplete((r, e) -> {
                    if (e != null) {
                        newPromise.completeExceptionally(e);
                        return;
                    }
                    newPromise.complete(r);
                });
                return;
            }

            RedisPubSubListener