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/*
 * Copyright (C) 2020 Graylog, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the Server Side Public License, version 1,
 * as published by MongoDB, Inc.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * Server Side Public License for more details.
 *
 * You should have received a copy of the Server Side Public License
 * along with this program. If not, see
 * .
 */
package org.graylog.plugins.pipelineprocessor.functions.messages;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.MultimapBuilder;
import com.google.common.collect.SetMultimap;
import com.google.common.eventbus.EventBus;
import com.google.common.eventbus.Subscribe;
import com.google.common.util.concurrent.AbstractIdleService;
import org.graylog2.plugin.streams.Stream;
import org.graylog2.streams.StreamService;
import org.graylog2.streams.events.StreamsChangedEvent;

import javax.annotation.Nullable;
import javax.inject.Inject;
import javax.inject.Named;
import javax.inject.Singleton;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

@SuppressWarnings("UnstableApiUsage")
@Singleton
public class StreamCacheService extends AbstractIdleService {
    private final EventBus eventBus;
    private final StreamService streamService;
    private final ScheduledExecutorService executorService;

    private volatile SetMultimap nameToStream = MultimapBuilder.hashKeys().hashSetValues().build();
    private volatile Map idToStream = new HashMap<>();

    @Inject
    public StreamCacheService(EventBus eventBus,
                              StreamService streamService,
                              @Named("daemonScheduler") ScheduledExecutorService executorService) {
        this.eventBus = eventBus;
        this.streamService = streamService;
        this.executorService = executorService;
    }

    @Override
    protected void startUp() {
        updateStreams();
        eventBus.register(this);
    }

    @Override
    protected void shutDown() {
        eventBus.unregister(this);
    }

    @Subscribe
    public void handleStreamUpdate(StreamsChangedEvent event) {
        executorService.schedule(this::updateStreams, 0, TimeUnit.SECONDS);
    }

    public Collection getByName(String name) {
        return nameToStream.get(name);
    }

    @Nullable
    public Stream getById(String id) {
        return idToStream.get(id);
    }

    @VisibleForTesting
    public void updateStreams() {
        final SetMultimap streamsByName = MultimapBuilder.hashKeys().hashSetValues().build();
        final Map streamById = new HashMap<>();

        streamService.loadAllEnabled().forEach(stream -> {
            streamsByName.put(stream.getTitle(), stream);
            streamById.put(stream.getId(), stream);
        });

        this.idToStream = streamById;
        this.nameToStream = streamsByName;
    }
}