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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.phoenix.monitoring;

import static org.apache.phoenix.monitoring.MetricType.CACHE_REFRESH_SPLITS_COUNTER;
import static org.apache.phoenix.monitoring.MetricType.NUM_PARALLEL_SCANS;
import static org.apache.phoenix.monitoring.MetricType.QUERY_FAILED_COUNTER;
import static org.apache.phoenix.monitoring.MetricType.QUERY_POINTLOOKUP_FAILED_COUNTER;
import static org.apache.phoenix.monitoring.MetricType.QUERY_POINTLOOKUP_TIMEOUT_COUNTER;
import static org.apache.phoenix.monitoring.MetricType.QUERY_SCAN_FAILED_COUNTER;
import static org.apache.phoenix.monitoring.MetricType.QUERY_SCAN_TIMEOUT_COUNTER;
import static org.apache.phoenix.monitoring.MetricType.QUERY_TIMEOUT_COUNTER;
import static org.apache.phoenix.monitoring.MetricType.RESULT_SET_TIME_MS;
import static org.apache.phoenix.monitoring.MetricType.WALL_CLOCK_TIME_MS;

import java.util.HashMap;
import java.util.Map;

import org.apache.phoenix.log.LogLevel;
import org.apache.phoenix.thirdparty.com.google.common.annotations.VisibleForTesting;

/**
 * Class that represents the overall metrics associated with a query being executed by the phoenix.
 */
public class OverAllQueryMetrics {
    private final MetricsStopWatch queryWatch;
    private final MetricsStopWatch resultSetWatch;
    private final CombinableMetric numParallelScans;
    private final CombinableMetric wallClockTimeMS;
    private final CombinableMetric resultSetTimeMS;
    private final CombinableMetric queryTimedOut;
    private final CombinableMetric queryPointLookupTimedOut;
    private final CombinableMetric queryScanTimedOut;
    private final CombinableMetric queryFailed;
    private final CombinableMetric queryPointLookupFailed;
    private final CombinableMetric queryScanFailed;
    private final CombinableMetric cacheRefreshedDueToSplits;

    public OverAllQueryMetrics(boolean isRequestMetricsEnabled, LogLevel connectionLogLevel) {
        queryWatch = MetricUtil.getMetricsStopWatch(isRequestMetricsEnabled, connectionLogLevel,
                WALL_CLOCK_TIME_MS);
        resultSetWatch = MetricUtil.getMetricsStopWatch(isRequestMetricsEnabled, connectionLogLevel,
                RESULT_SET_TIME_MS);
        numParallelScans = MetricUtil.getCombinableMetric(isRequestMetricsEnabled,
                connectionLogLevel, NUM_PARALLEL_SCANS);
        wallClockTimeMS = MetricUtil.getCombinableMetric(isRequestMetricsEnabled,
                connectionLogLevel, WALL_CLOCK_TIME_MS);
        resultSetTimeMS = MetricUtil.getCombinableMetric(isRequestMetricsEnabled,
                connectionLogLevel, RESULT_SET_TIME_MS);
        queryTimedOut = MetricUtil.getCombinableMetric(isRequestMetricsEnabled,
                connectionLogLevel, QUERY_TIMEOUT_COUNTER);
        queryPointLookupTimedOut = MetricUtil.getCombinableMetric(isRequestMetricsEnabled,connectionLogLevel, QUERY_POINTLOOKUP_TIMEOUT_COUNTER);
        queryScanTimedOut = MetricUtil.getCombinableMetric(isRequestMetricsEnabled,connectionLogLevel, QUERY_SCAN_TIMEOUT_COUNTER);
        queryFailed = MetricUtil.getCombinableMetric(isRequestMetricsEnabled,
                connectionLogLevel, QUERY_FAILED_COUNTER);
        queryPointLookupFailed = MetricUtil.getCombinableMetric(isRequestMetricsEnabled,connectionLogLevel, QUERY_POINTLOOKUP_FAILED_COUNTER);
        queryScanFailed = MetricUtil.getCombinableMetric(isRequestMetricsEnabled,connectionLogLevel, QUERY_SCAN_FAILED_COUNTER);
        cacheRefreshedDueToSplits = MetricUtil.getCombinableMetric(isRequestMetricsEnabled,
                connectionLogLevel, CACHE_REFRESH_SPLITS_COUNTER);
    }

    public void updateNumParallelScans(long numParallelScans) {
        this.numParallelScans.change(numParallelScans);
    }

    public void queryTimedOut() {
        queryTimedOut.increment();
    }

    public void queryPointLookupTimedOut() {
        queryPointLookupTimedOut.increment();
    }

    public void queryScanTimedOut() {
        queryScanTimedOut.increment();
    }

    public void queryFailed() {
        queryFailed.increment();
    }

    public void queryPointLookupFailed() {
        queryPointLookupFailed.increment();
    }

    public void queryScanFailed() {
        queryScanFailed.increment();
    }

    public void cacheRefreshedDueToSplits() {
        cacheRefreshedDueToSplits.increment();
    }

    public void startQuery() {
        if (!queryWatch.isRunning()) {
            queryWatch.start();
        }
    }

    public void endQuery() {
        boolean wasRunning = queryWatch.isRunning();
        queryWatch.stop();
        if (wasRunning) {
            wallClockTimeMS.change(queryWatch.getElapsedTimeInMs());
        }
    }

    public void startResultSetWatch() {
        resultSetWatch.start();
    }

    public void stopResultSetWatch() {
        boolean wasRunning = resultSetWatch.isRunning();
        resultSetWatch.stop();
        if (wasRunning) {
            resultSetTimeMS.change(resultSetWatch.getElapsedTimeInMs());
        }
    }

    @VisibleForTesting
    long getWallClockTimeMs() {
        return wallClockTimeMS.getValue();
    }

    @VisibleForTesting
    long getResultSetTimeMs() {
        return resultSetTimeMS.getValue();
    }

    public Map publish() {
        Map metricsForPublish = new HashMap<>();
        metricsForPublish.put(numParallelScans.getMetricType(), numParallelScans.getValue());
        metricsForPublish.put(wallClockTimeMS.getMetricType(), wallClockTimeMS.getValue());
        metricsForPublish.put(resultSetTimeMS.getMetricType(), resultSetTimeMS.getValue());
        metricsForPublish.put(queryTimedOut.getMetricType(), queryTimedOut.getValue());
        metricsForPublish.put(queryPointLookupTimedOut.getMetricType(), queryPointLookupTimedOut.getValue());
        metricsForPublish.put(queryScanTimedOut.getMetricType(), queryScanTimedOut.getValue());
        metricsForPublish.put(queryFailed.getMetricType(), queryFailed.getValue());
        metricsForPublish.put(queryPointLookupFailed.getMetricType(), queryPointLookupFailed.getValue());
        metricsForPublish.put(queryScanFailed.getMetricType(), queryScanFailed.getValue());
        metricsForPublish.put(cacheRefreshedDueToSplits.getMetricType(), cacheRefreshedDueToSplits.getValue());
        return metricsForPublish;
    }

    public void reset() {
        numParallelScans.reset();
        wallClockTimeMS.reset();
        resultSetTimeMS.reset();
        queryTimedOut.reset();
        queryPointLookupTimedOut.reset();
        queryScanTimedOut.reset();
        queryFailed.reset();
        queryPointLookupFailed.reset();
        queryScanFailed.reset();
        cacheRefreshedDueToSplits.reset();
        queryWatch.stop();
        resultSetWatch.stop();
    }

    public OverAllQueryMetrics combine(OverAllQueryMetrics metric) {
        cacheRefreshedDueToSplits.combine(metric.cacheRefreshedDueToSplits);
        queryFailed.combine(metric.queryFailed);
        queryPointLookupFailed.combine(metric.queryPointLookupFailed);
        queryScanFailed.combine(metric.queryScanFailed);
        queryTimedOut.combine(metric.queryTimedOut);
        queryPointLookupTimedOut.combine(metric.queryPointLookupTimedOut);
        queryScanTimedOut.combine(metric.queryScanTimedOut);
        numParallelScans.combine(metric.numParallelScans);
        wallClockTimeMS.combine(metric.wallClockTimeMS);
        resultSetTimeMS.combine(metric.resultSetTimeMS);
        return this;
    }

}