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/*
 * Copyright (c) 2014 AsyncHttpClient Project. All rights reserved.
 *
 * This program is licensed to you under the Apache License Version 2.0,
 * and you may not use this file except in compliance with the Apache License Version 2.0.
 * You may obtain a copy of the Apache License Version 2.0 at
 *     http://www.apache.org/licenses/LICENSE-2.0.
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the Apache License Version 2.0 is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Apache License Version 2.0 for the specific language governing permissions and limitations there under.
 */
package org.asynchttpclient.netty.channel.pool;

import static org.asynchttpclient.util.DateUtils.millisTime;
import io.netty.channel.Channel;
import io.netty.handler.ssl.SslHandler;
import io.netty.util.Timeout;
import io.netty.util.Timer;
import io.netty.util.TimerTask;
import io.netty.util.internal.chmv8.ConcurrentHashMapV8;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;

import org.asynchttpclient.AsyncHttpClientConfig;
import org.asynchttpclient.netty.NettyResponseFuture;
import org.asynchttpclient.netty.channel.Channels;
import org.asynchttpclient.netty.channel.pool.ChannelPoolPartitionSelector;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * A simple implementation of
 * {@link com.ning.http.client.providers.netty.pool.ChannelPool} based on a
 * {@link java.util.concurrent.ConcurrentHashMap}
 */
public final class DefaultChannelPool implements ChannelPool {

    private static final Logger LOGGER = LoggerFactory.getLogger(DefaultChannelPool.class);

    private static final ConcurrentHashMapV8.Fun> PARTITION_COMPUTER = new ConcurrentHashMapV8.Fun>() {
        @Override
        public ConcurrentLinkedQueue apply(Object partitionKey) {
            return new ConcurrentLinkedQueue<>();
        }
    };

    private final ConcurrentHashMapV8> partitions = new ConcurrentHashMapV8<>();
    private final ConcurrentHashMapV8 channelId2Creation = new ConcurrentHashMapV8<>();
    private final AtomicBoolean isClosed = new AtomicBoolean(false);
    private final Timer nettyTimer;
    private final boolean sslConnectionPoolEnabled;
    private final int maxConnectionTTL;
    private final boolean maxConnectionTTLDisabled;
    private final long maxIdleTime;
    private final boolean maxIdleTimeDisabled;
    private final long cleanerPeriod;

    public DefaultChannelPool(AsyncHttpClientConfig config, Timer hashedWheelTimer) {
        this(config.getPooledConnectionIdleTimeout(),//
                config.getConnectionTTL(),//
                config.isAllowPoolingSslConnections(),//
                hashedWheelTimer);
    }

    private int channelId(Channel channel) {
        return channel.hashCode();
    }

    public DefaultChannelPool(long maxIdleTime,//
            int maxConnectionTTL,//
            boolean sslConnectionPoolEnabled,//
            Timer nettyTimer) {
        this.sslConnectionPoolEnabled = sslConnectionPoolEnabled;
        this.maxIdleTime = maxIdleTime;
        this.maxConnectionTTL = maxConnectionTTL;
        maxConnectionTTLDisabled = maxConnectionTTL <= 0;
        this.nettyTimer = nettyTimer;
        maxIdleTimeDisabled = maxIdleTime <= 0;

        cleanerPeriod = Math.min(maxConnectionTTLDisabled ? Long.MAX_VALUE : maxConnectionTTL, maxIdleTimeDisabled ? Long.MAX_VALUE : maxIdleTime);

        if (!maxConnectionTTLDisabled || !maxIdleTimeDisabled)
            scheduleNewIdleChannelDetector(new IdleChannelDetector());
    }

    private void scheduleNewIdleChannelDetector(TimerTask task) {
        nettyTimer.newTimeout(task, cleanerPeriod, TimeUnit.MILLISECONDS);
    }

    private static final class ChannelCreation {
        final long creationTime;
        final Object partitionKey;

        ChannelCreation(long creationTime, Object partitionKey) {
            this.creationTime = creationTime;
            this.partitionKey = partitionKey;
        }
    }

    private static final class IdleChannel {
        final Channel channel;
        final long start;

        IdleChannel(Channel channel, long start) {
            if (channel == null)
                throw new NullPointerException("channel");
            this.channel = channel;
            this.start = start;
        }

        @Override
        // only depends on channel
        public boolean equals(Object o) {
            return this == o || (o instanceof IdleChannel && channel.equals(IdleChannel.class.cast(o).channel));
        }

        @Override
        public int hashCode() {
            return channel.hashCode();
        }
    }

    private boolean isTTLExpired(Channel channel, long now) {
        if (maxConnectionTTLDisabled)
            return false;

        ChannelCreation creation = channelId2Creation.get(channelId(channel));
        return creation != null && now - creation.creationTime >= maxConnectionTTL;
    }

    private boolean isRemotelyClosed(Channel channel) {
        return !channel.isActive();
    }

    private final class IdleChannelDetector implements TimerTask {

        private boolean isIdleTimeoutExpired(IdleChannel idleChannel, long now) {
            return !maxIdleTimeDisabled && now - idleChannel.start >= maxIdleTime;
        }

        private List expiredChannels(ConcurrentLinkedQueue partition, long now) {
            // lazy create
            List idleTimeoutChannels = null;
            for (IdleChannel idleChannel : partition) {
                if (isTTLExpired(idleChannel.channel, now) || isIdleTimeoutExpired(idleChannel, now) || isRemotelyClosed(idleChannel.channel)) {
                    LOGGER.debug("Adding Candidate expired Channel {}", idleChannel.channel);
                    if (idleTimeoutChannels == null)
                        idleTimeoutChannels = new ArrayList<>();
                    idleTimeoutChannels.add(idleChannel);
                }
            }

            return idleTimeoutChannels != null ? idleTimeoutChannels : Collections. emptyList();
        }

        private boolean isChannelCloseable(Channel channel) {
            Object attribute = Channels.getAttribute(channel);
            if (attribute instanceof NettyResponseFuture) {
                NettyResponseFuture future = (NettyResponseFuture) attribute;
                if (!future.isDone()) {
                    LOGGER.error("Future not in appropriate state %s, not closing", future);
                    return false;
                }
            }
            return true;
        }

        private final List closeChannels(List candidates) {

            // lazy create, only if we have a non-closeable channel
            List closedChannels = null;
            for (int i = 0; i < candidates.size(); i++) {
                IdleChannel idleChannel = candidates.get(i);
                if (!isChannelCloseable(idleChannel.channel))
                    if (isChannelCloseable(idleChannel.channel)) {
                        LOGGER.debug("Closing Idle Channel {}", idleChannel.channel);
                        close(idleChannel.channel);
                        if (closedChannels != null) {
                            closedChannels.add(idleChannel);
                        }

                    } else if (closedChannels == null) {
                        // first non closeable to be skipped, copy all
                        // previously skipped closeable channels
                        closedChannels = new ArrayList<>(candidates.size());
                        for (int j = 0; j < i; j++)
                            closedChannels.add(candidates.get(j));
                    }
            }

            return closedChannels != null ? closedChannels : candidates;
        }

        public void run(Timeout timeout) throws Exception {

            if (isClosed.get())
                return;

            try {
                if (LOGGER.isDebugEnabled())
                    for (Object key: partitions.keySet()) {
                        LOGGER.debug("Entry count for : {} : {}", key, partitions.get(key).size());
                    }

                long start = millisTime();
                int closedCount = 0;
                int totalCount = 0;

                for (ConcurrentLinkedQueue partition : partitions.values()) {

                    // store in intermediate unsynchronized lists to minimize
                    // the impact on the ConcurrentLinkedQueue
                    if (LOGGER.isDebugEnabled())
                        totalCount += partition.size();

                    List closedChannels = closeChannels(expiredChannels(partition, start));

                    if (!closedChannels.isEmpty()) {
                        for (IdleChannel closedChannel : closedChannels)
                            channelId2Creation.remove(channelId(closedChannel.channel));

                        partition.removeAll(closedChannels);
                        closedCount += closedChannels.size();
                    }
                }

                long duration = millisTime() - start;

                LOGGER.debug("Closed {} connections out of {} in {}ms", closedCount, totalCount, duration);

            } catch (Throwable t) {
                LOGGER.error("uncaught exception!", t);
            }

            scheduleNewIdleChannelDetector(timeout.task());
        }
    }

    /**
     * {@inheritDoc}
     */
    public boolean offer(Channel channel, Object partitionKey) {
        if (isClosed.get() || (!sslConnectionPoolEnabled && channel.pipeline().get(SslHandler.class) != null))
            return false;

        long now = millisTime();

        if (isTTLExpired(channel, now))
            return false;

        boolean added = partitions.computeIfAbsent(partitionKey, PARTITION_COMPUTER).add(new IdleChannel(channel, now));
        if (added)
            channelId2Creation.putIfAbsent(channelId(channel), new ChannelCreation(now, partitionKey));

        return added;
    }

    /**
     * {@inheritDoc}
     */
    public Channel poll(Object partitionKey) {

        IdleChannel idleChannel = null;
        ConcurrentLinkedQueue partition = partitions.get(partitionKey);
        if (partition != null) {
            while (idleChannel == null) {
                idleChannel = partition.poll();

                if (idleChannel == null)
                    // pool is empty
                    break;
                else if (isRemotelyClosed(idleChannel.channel)) {
                    idleChannel = null;
                    LOGGER.trace("Channel not connected or not opened, probably remotely closed!");
                }
            }
        }
        return idleChannel != null ? idleChannel.channel : null;
    }

    /**
     * {@inheritDoc}
     */
    public boolean removeAll(Channel channel) {
        ChannelCreation creation = channelId2Creation.remove(channelId(channel));
        return !isClosed.get() && creation != null && partitions.get(creation.partitionKey).remove(channel);
    }

    /**
     * {@inheritDoc}
     */
    public boolean isOpen() {
        return !isClosed.get();
    }

    /**
     * {@inheritDoc}
     */
    public void destroy() {
        if (isClosed.getAndSet(true))
            return;

        for (ConcurrentLinkedQueue partition : partitions.values()) {
            for (IdleChannel idleChannel : partition)
                close(idleChannel.channel);
        }

        partitions.clear();
        channelId2Creation.clear();
    }

    private void close(Channel channel) {
        // FIXME pity to have to do this here
        Channels.setDiscard(channel);
        channelId2Creation.remove(channelId(channel));
        Channels.silentlyCloseChannel(channel);
    }

    private void flushPartition(Object partitionKey, ConcurrentLinkedQueue partition) {
        if (partition != null) {
            partitions.remove(partitionKey);
            for (IdleChannel idleChannel : partition)
                close(idleChannel.channel);
        }
    }

    @Override
    public void flushPartition(Object partitionKey) {
        flushPartition(partitionKey, partitions.get(partitionKey));
    }

    @Override
    public void flushPartitions(ChannelPoolPartitionSelector selector) {

        for (Map.Entry> partitionsEntry : partitions.entrySet()) {
            Object partitionKey = partitionsEntry.getKey();
            if (selector.select(partitionKey))
                flushPartition(partitionKey, partitionsEntry.getValue());
        }
    }
}