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/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [https://neo4j.com]
 *
 * 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 org.neo4j.driver.internal.metrics;

import static java.lang.String.format;
import static java.util.Collections.unmodifiableCollection;

import java.time.Clock;
import java.util.Collection;
import java.util.Map;
import java.util.Objects;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.IntSupplier;
import org.neo4j.driver.ConnectionPoolMetrics;
import org.neo4j.driver.Logger;
import org.neo4j.driver.Logging;
import org.neo4j.driver.Metrics;
import org.neo4j.driver.internal.bolt.api.BoltServerAddress;
import org.neo4j.driver.internal.bolt.api.ListenerEvent;
import org.neo4j.driver.internal.bolt.api.MetricsListener;

final class InternalMetrics implements Metrics, MetricsListener {
    private final Map connectionPoolMetrics;
    private final Clock clock;
    private final Logger log;

    InternalMetrics(Clock clock, Logging logging) {
        Objects.requireNonNull(clock);
        this.connectionPoolMetrics = new ConcurrentHashMap<>();
        this.clock = clock;
        this.log = logging.getLog(getClass());
    }

    @Override
    public void registerPoolMetrics(
            String poolId, BoltServerAddress serverAddress, IntSupplier inUseSupplier, IntSupplier idleSupplier) {
        this.connectionPoolMetrics.put(
                poolId, new InternalConnectionPoolMetrics(poolId, serverAddress, inUseSupplier, idleSupplier));
    }

    @Override
    public void removePoolMetrics(String id) {
        this.connectionPoolMetrics.remove(id);
    }

    @Override
    public void beforeCreating(String poolId, ListenerEvent creatingEvent) {
        poolMetrics(poolId).beforeCreating(creatingEvent);
    }

    @Override
    public void afterCreated(String poolId, ListenerEvent creatingEvent) {
        poolMetrics(poolId).afterCreated(creatingEvent);
    }

    @Override
    public void afterFailedToCreate(String poolId) {
        poolMetrics(poolId).afterFailedToCreate();
    }

    @Override
    public void afterClosed(String poolId) {
        poolMetrics(poolId).afterClosed();
    }

    @Override
    public void beforeAcquiringOrCreating(String poolId, ListenerEvent acquireEvent) {
        poolMetrics(poolId).beforeAcquiringOrCreating(acquireEvent);
    }

    @Override
    public void afterAcquiringOrCreating(String poolId) {
        poolMetrics(poolId).afterAcquiringOrCreating();
    }

    @Override
    public void afterAcquiredOrCreated(String poolId, ListenerEvent acquireEvent) {
        poolMetrics(poolId).afterAcquiredOrCreated(acquireEvent);
    }

    @Override
    public void afterConnectionCreated(String poolId, ListenerEvent inUseEvent) {
        poolMetrics(poolId).acquired(inUseEvent);
    }

    @Override
    public void afterConnectionReleased(String poolId, ListenerEvent inUseEvent) {
        poolMetrics(poolId).released(inUseEvent);
    }

    @Override
    public void afterTimedOutToAcquireOrCreate(String poolId) {
        poolMetrics(poolId).afterTimedOutToAcquireOrCreate();
    }

    @Override
    public ListenerEvent createListenerEvent() {
        return new TimeRecorderListenerEvent(clock);
    }

    @Override
    public Collection connectionPoolMetrics() {
        return unmodifiableCollection(this.connectionPoolMetrics.values());
    }

    @Override
    public String toString() {
        return format("PoolMetrics=%s", connectionPoolMetrics);
    }

    private ConnectionPoolMetricsListener poolMetrics(String poolId) {
        var poolMetrics = (InternalConnectionPoolMetrics) this.connectionPoolMetrics.get(poolId);
        if (poolMetrics == null) {
            log.warn(format("Failed to find pool metrics with id `%s` in %s.", poolId, this.connectionPoolMetrics));
            return DevNullPoolMetricsListener.INSTANCE;
        }
        return poolMetrics;
    }
}