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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;

import com.github.lontime.shaded.org.redisson.api.RFuture;
import com.github.lontime.shaded.org.redisson.api.RPatternTopic;
import com.github.lontime.shaded.org.redisson.api.listener.PatternMessageListener;
import com.github.lontime.shaded.org.redisson.api.listener.PatternStatusListener;
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.RedisTimeoutException;
import com.github.lontime.shaded.org.redisson.client.codec.Codec;
import com.github.lontime.shaded.org.redisson.client.protocol.pubsub.PubSubType;
import com.github.lontime.shaded.org.redisson.command.CommandAsyncExecutor;
import com.github.lontime.shaded.org.redisson.config.MasterSlaveServersConfig;
import com.github.lontime.shaded.org.redisson.misc.CompletableFutureWrapper;
import com.github.lontime.shaded.org.redisson.pubsub.AsyncSemaphore;
import com.github.lontime.shaded.org.redisson.pubsub.PubSubConnectionEntry;
import com.github.lontime.shaded.org.redisson.pubsub.PublishSubscribeService;

import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.CompletableFuture;

/**
 * Distributed topic implementation. Messages are delivered to all message listeners across Redis cluster.
 *
 * @author Nikita Koksharov
 *
 */
public class RedissonPatternTopic implements RPatternTopic {

    final PublishSubscribeService subscribeService;
    final CommandAsyncExecutor commandExecutor;
    private final String name;
    private final ChannelName channelName;
    private final Codec codec;

    protected RedissonPatternTopic(CommandAsyncExecutor commandExecutor, String name) {
        this(commandExecutor.getConnectionManager().getCodec(), commandExecutor, name);
    }

    protected RedissonPatternTopic(Codec codec, CommandAsyncExecutor commandExecutor, String name) {
        this.commandExecutor = commandExecutor;
        this.name = name;
        this.channelName = new ChannelName(name);
        this.codec = codec;
        this.subscribeService = commandExecutor.getConnectionManager().getSubscribeService();
    }

    @Override
    public int addListener(PatternStatusListener listener) {
        return addListener(new PubSubPatternStatusListener(listener, name));
    }

    @Override
    public  int addListener(Class type, PatternMessageListener listener) {
        PubSubPatternMessageListener pubSubListener = new PubSubPatternMessageListener(type, listener, name);
        return addListener(pubSubListener);
    }

    private int addListener(RedisPubSubListener pubSubListener) {
        CompletableFuture> future = subscribeService.psubscribe(channelName, codec, pubSubListener);
        commandExecutor.get(future);
        return System.identityHashCode(pubSubListener);
    }
    
    @Override
    public RFuture addListenerAsync(PatternStatusListener listener) {
        PubSubPatternStatusListener pubSubListener = new PubSubPatternStatusListener(listener, name);
        return addListenerAsync(pubSubListener);
    }
    
    @Override
    public  RFuture addListenerAsync(Class type, PatternMessageListener listener) {
        PubSubPatternMessageListener pubSubListener = new PubSubPatternMessageListener(type, listener, name);
        return addListenerAsync(pubSubListener);
    }
    
    private RFuture addListenerAsync(RedisPubSubListener pubSubListener) {
        CompletableFuture> future = subscribeService.psubscribe(channelName, codec, pubSubListener);
        CompletableFuture f = future.thenApply(res -> {
            return System.identityHashCode(pubSubListener);
        });
        return new CompletableFutureWrapper<>(f);
    }
    
    protected void acquire(AsyncSemaphore semaphore) {
        MasterSlaveServersConfig config = commandExecutor.getConnectionManager().getConfig();
        int timeout = config.getTimeout() + config.getRetryInterval() * config.getRetryAttempts();
        if (!semaphore.tryAcquire(timeout)) {
            throw new RedisTimeoutException("Remove listeners operation timeout: (" + timeout + "ms) for " + name + " topic");
        }
    }
    
    @Override
    public RFuture removeListenerAsync(int listenerId) {
        CompletableFuture f = subscribeService.removeListenerAsync(PubSubType.PUNSUBSCRIBE, channelName, listenerId);
        return new CompletableFutureWrapper<>(f);
    }
    
    @Override
    public void removeListener(int listenerId) {
        commandExecutor.get(removeListenerAsync(listenerId).toCompletableFuture());
    }
    
    @Override
    public void removeAllListeners() {
        commandExecutor.get(removeAllListenersAsync());
    }

    @Override
    public RFuture removeAllListenersAsync() {
        CompletableFuture f = subscribeService.removeAllListenersAsync(PubSubType.PUNSUBSCRIBE, channelName);
        return new CompletableFutureWrapper<>(f);
    }

    @Override
    public void removeListener(PatternMessageListener listener) {
        CompletableFuture future = subscribeService.removeListenerAsync(PubSubType.PUNSUBSCRIBE, channelName, listener);
        commandExecutor.get(future);
    }
    
    @Override
    public List getPatternNames() {
        return Collections.singletonList(name);
    }

}