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/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * 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 io.micrometer.core.instrument.MeterRegistry;

import java.util.Collection;
import java.util.Collections;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.IntSupplier;

import org.neo4j.driver.ConnectionPoolMetrics;
import org.neo4j.driver.Metrics;
import org.neo4j.driver.net.ServerAddress;

final class MicrometerMetrics implements Metrics, MetricsListener
{
    private final MeterRegistry meterRegistry;
    private final Map connectionPoolMetrics;

    public MicrometerMetrics( MeterRegistry meterRegistry )
    {
        this.meterRegistry = meterRegistry;
        this.connectionPoolMetrics = new ConcurrentHashMap<>();
    }

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

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

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

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

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

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

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

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

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

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

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

    @Override
    public ListenerEvent createListenerEvent()
    {
        return new MicrometerTimerListenerEvent( this.meterRegistry );
    }

    @Override
    public void registerPoolMetrics( String poolId, ServerAddress address, IntSupplier inUseSupplier, IntSupplier idleSupplier )
    {
        this.connectionPoolMetrics.put( poolId, new MicrometerConnectionPoolMetrics( poolId, address, inUseSupplier, idleSupplier, this.meterRegistry ) );
    }

    // For testing purposes only
    void putPoolMetrics( String poolId, ConnectionPoolMetrics poolMetrics )
    {
        this.connectionPoolMetrics.put( poolId, poolMetrics );
    }

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

    private ConnectionPoolMetricsListener poolMetricsListener( String poolId )
    {
        ConnectionPoolMetricsListener poolMetrics = (ConnectionPoolMetricsListener) this.connectionPoolMetrics.get( poolId );
        if ( poolMetrics == null )
        {
            return DevNullPoolMetricsListener.INSTANCE;
        }
        return poolMetrics;
    }
}