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/*
 * Copyright (c) 2008-2024, Hazelcast, Inc. All Rights Reserved.
 *
 * 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.hazelcast.wan.impl;

import com.hazelcast.internal.monitor.LocalWanPublisherStats;
import com.hazelcast.internal.partition.PartitionReplicationEvent;
import com.hazelcast.internal.services.ServiceNamespace;
import com.hazelcast.wan.WanEvent;
import com.hazelcast.wan.WanMigrationAwarePublisher;
import com.hazelcast.wan.WanPublisher;

import javax.annotation.Nonnull;
import java.util.Collection;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.concurrent.ConcurrentMap;

import static com.hazelcast.internal.util.MapUtil.createHashMap;
import static com.hazelcast.internal.util.Preconditions.checkNotNull;

/**
 * WAN replication scheme implementation delegating to multiple WAN
 * replication publisher implementations. This implementation is a container
 * for multiple WAN publishers.
 * When publishing an event on this delegate, all publishers are notified.
 */
public final class DelegatingWanScheme {
    /** Non-null WAN replication name */
    private final String name;
    /** Non-null WAN publishers, grouped by publisher ID */
    private final ConcurrentMap publishers;

    public DelegatingWanScheme(@Nonnull String name,
                               @Nonnull ConcurrentMap publishers) {
        checkNotNull(name, "WAN publisher name should not be null");
        checkNotNull(publishers, "WAN publisher map should not be null");
        this.name = name;
        this.publishers = publishers;
    }

    /** Returns all {@link WanPublisher}s for this delegate */
    public @Nonnull
    Collection getPublishers() {
        return publishers.values();
    }

    /**
     * Returns the {@link WanPublisher} with the {@code publisherId}
     * or {@code null} if it doesn't exist.
     */
    public WanPublisher getPublisher(String publisherId) {
        return publishers.get(publisherId);
    }

    /**
     * Adds the WAN replication publisher under the provided ID, if not already
     * present.
     * If there is already a publisher with the same ID, the method throws a
     * {@link IllegalStateException}, even if it's the same publisher as the
     * provided one.
     * NOTE: used only in Hazelcast Enterprise
     *
     * @param publisherId the WAN replication publisher ID
     * @param publisher   the WAN replication publisher to add
     */
    public void addPublisher(@Nonnull String publisherId,
                             @Nonnull WanPublisher publisher) {
        if (publishers.putIfAbsent(publisherId, publisher) != null) {
            throw new IllegalStateException("Publisher with publisher ID " + publisherId
                    + " on WAN replication scheme " + name + " is already present and cannot be overriden");
        }
    }

    public String getName() {
        return name;
    }

    /**
     * Publishes a replication event to all publishers to which this publisher
     * delegates.
     */
    public void publishReplicationEvent(WanEvent event) {
        for (WanPublisher publisher : publishers.values()) {
            publisher.publishReplicationEvent(event);
        }
    }

    /**
     * Publishes a backup replication event to all publishers to which this
     * publisher delegates.
     */
    public void publishReplicationEventBackup(WanEvent event) {
        for (WanPublisher publisher : publishers.values()) {
            publisher.publishReplicationEventBackup(event);
        }
    }

    /**
     * Publishes a replication event to all publishers to which this publisher
     * delegates.
     * Silently skips publishers not supporting republication.
     * NOTE: used only in Hazelcast Enterprise
     */
    public void republishReplicationEvent(InternalWanEvent wanEvent) {
        for (WanPublisher publisher : publishers.values()) {
            if (publisher instanceof InternalWanPublisher wanPublisher) {
                wanPublisher.republishReplicationEvent(wanEvent);
            }
        }
    }

    /**
     * Silently skips publishers not supporting statistics.
     *
     * @return publisher statistics, grouped by publisher ID
     */
    public Map getStats() {
        final Map statsMap = createHashMap(publishers.size());
        for (Entry publisherEntry : publishers.entrySet()) {
            WanPublisher publisher = publisherEntry.getValue();
            if (publisher instanceof InternalWanPublisher wanPublisher) {
                String publisherId = publisherEntry.getKey();
                LocalWanPublisherStats stats = wanPublisher.getStats();
                if (stats != null) {
                    statsMap.put(publisherId, stats);
                }
            }
        }
        return statsMap;
    }

    public void doPrepublicationChecks() {
        for (WanPublisher publisher : publishers.values()) {
            publisher.doPrepublicationChecks();
        }
    }

    /**
     * Collect all replication data matching the replication event and collection
     * of namespaces being replicated.
     * Returns containers for WAN replication events grouped by WAN publisher ID.
     * Silently skips publishers not supporting replication.
     *
     * @param event      the replication event
     * @param namespaces the object namespaces which are being replicated
     * @return a map from WAN publisher ID to container object for WAN replication events
     */
    public Map prepareEventContainerReplicationData(PartitionReplicationEvent event,
                                                                    Collection namespaces) {
        Map eventContainers = createHashMap(publishers.size());
        for (Entry publisherEntry : publishers.entrySet()) {
            WanPublisher publisher = publisherEntry.getValue();
            if (publisher instanceof WanMigrationAwarePublisher awarePublisher) {
                Object eventContainer = awarePublisher
                        .prepareEventContainerReplicationData(event, namespaces);
                if (eventContainer != null) {
                    String publisherId = publisherEntry.getKey();
                    eventContainers.put(publisherId, eventContainer);
                }
            }
        }
        return eventContainers;
    }

    /**
     * Collect the namespaces of all queues that should be replicated by the
     * replication event.
     * Silently skips publishers not supporting replication.
     *
     * @param event      the replication event
     * @param namespaces the set in which namespaces should be added
     */
    public void collectAllServiceNamespaces(PartitionReplicationEvent event,
                                            Set namespaces) {
        for (WanPublisher publisher : publishers.values()) {
            if (publisher instanceof WanMigrationAwarePublisher awarePublisher) {
                awarePublisher
                        .collectAllServiceNamespaces(event, namespaces);
            }
        }
    }

    /**
     * Releases all resources for the map with the given {@code mapName}.
     * NOTE: used only in Hazelcast Enterprise
     *
     * @param mapName the map mapName
     */
    public void destroyMapData(String mapName) {
        for (WanPublisher publisher : publishers.values()) {
            if (publisher instanceof InternalWanPublisher wanPublisher) {
                wanPublisher.destroyMapData(mapName);
            }
        }
    }
}