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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2020-2021 Payara Foundation and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 * If you wish your version of this file to be governed by only the CDDL or
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 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
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 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
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 */
package fish.payara.jdbc;

import static java.lang.Double.parseDouble;
import static java.lang.Math.round;

import java.util.Map;
import java.util.Map.Entry;
import java.util.Queue;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentLinkedQueue;

import jakarta.inject.Inject;
import jakarta.inject.Singleton;

import org.glassfish.api.jdbc.SQLTraceRecord;
import org.glassfish.api.jdbc.SQLTraceStore;
import org.glassfish.jdbc.config.JdbcConnectionPool;
import org.jvnet.hk2.annotations.Service;

import com.sun.appserv.connectors.internal.api.ConnectorsUtil;
import com.sun.enterprise.config.serverbeans.Domain;
import com.sun.enterprise.config.serverbeans.ResourcePool;

import fish.payara.monitoring.collect.MonitoringData;
import fish.payara.monitoring.collect.MonitoringDataCollector;
import fish.payara.monitoring.collect.MonitoringDataSource;
import fish.payara.monitoring.collect.MonitoringWatchCollector;
import fish.payara.monitoring.collect.MonitoringWatchSource;

@Service
@Singleton
public class SQLTraceStoreImpl implements SQLTraceStore, MonitoringDataSource, MonitoringWatchSource {

    private static final class SQLTraceEntry {
        final long thresholdMillis;
        final SQLTraceRecord trace;
        final String sql;

        SQLTraceEntry(long thresholdMillis, SQLTraceRecord trace, String sql) {
            this.thresholdMillis = thresholdMillis;
            this.trace = trace;
            this.sql = sql;
        }
    }

    @Inject
    private Domain domain;

    private final Map connectionPoolByName = new ConcurrentHashMap<>();
    private final Map> uncollectedTracesByPoolName = new ConcurrentHashMap<>();

    @Override
    public void trace(SQLTraceRecord record, String sql) {
        JdbcConnectionPool connectionPool = getJdbcConnectionPool(record.getPoolName());
        if (connectionPool == null) {
            return;
        }
        long threshold = thresholdInMillis(connectionPool);
        Queue queue = uncollectedTracesByPoolName.computeIfAbsent(record.getPoolName(), 
                key -> new ConcurrentLinkedQueue<>());
        if (queue.size() >= 50) {
            queue.poll(); // avoid queue creating a memory leak by accumulating entries in case no consumer polls them
        }
        queue.add(new SQLTraceEntry(threshold, record, sql));
    }

    @Override
    public void collect(MonitoringWatchCollector collector) {
        for (Entry poolEntry : connectionPoolByName.entrySet()) {
            JdbcConnectionPool pool = poolEntry.getValue();
            if (pool != null) {
                String poolName = poolEntry.getKey();
                long thresholdInMillis = thresholdInMillis(pool);
                if (thresholdInMillis > 0) {
                    collector.watch("ns:sql @:"+poolName+" MaxExecutionTime", poolName + " Slow Query", "ms")
                        .red(thresholdInMillis, 0, false, null, null, false);
                }
            }
        }
    }

    @Override
    @MonitoringData(ns = "sql")
    public void collect(MonitoringDataCollector collector) {
        long now = System.currentTimeMillis();
        for (Entry> poolEntry : uncollectedTracesByPoolName.entrySet()) {
            MonitoringDataCollector poolCollector = collector.group(poolEntry.getKey());
            int count = 0;
            long maxExecutionTime = 0L;
            long sumExecutionTime = 0L;
            Queue entries = poolEntry.getValue();
            SQLTraceEntry entry = entries.poll();
            while (entry != null) {
                if (now - entry.trace.getTimeStamp() < 5000) { // only add trace in case it was from last 5 seconds
                    count++;
                    long executionTime = entry.trace.getExecutionTime();
                    maxExecutionTime = Math.max(maxExecutionTime, executionTime);
                    sumExecutionTime += executionTime;
                    if (executionTime > entry.thresholdMillis) {
                        poolCollector.annotate( //
                                "MaxExecutionTime", executionTime, //
                                "Threshold", "" + entry.thresholdMillis, //
                                "Timestamp", "" + entry.trace.getTimeStamp(), //
                                "SQL", entry.sql);
                    }
                }
                entry = entries.poll();
            }
            poolCollector
                .collect("MaxExecutionTime", maxExecutionTime)
                .collect("AvgExecutionTime", count == 0L ? 0L : sumExecutionTime / count)
            ;
        }
    }

    private static long thresholdInMillis(JdbcConnectionPool pool) {
        String thresholdInSeconds = pool.getSlowQueryThresholdInSeconds();
        if (thresholdInSeconds == null || thresholdInSeconds.isEmpty()) {
            return -1;
        }
        return round(parseDouble(pool.getSlowQueryThresholdInSeconds()) * 1000);
    }

    private JdbcConnectionPool getJdbcConnectionPool(String poolName) {
        return connectionPoolByName.computeIfAbsent(poolName, name -> {
            ResourcePool pool = (ResourcePool) ConnectorsUtil.getResourceByName(
                    domain.getResources(), ResourcePool.class, poolName);
            return pool instanceof JdbcConnectionPool ? (JdbcConnectionPool) pool : null;
        });
    }
}