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/**
 * Copyright 2017 VMware, Inc.
 * 
 * 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
 * 

 * https://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 io.micrometer.statsd;

import io.micrometer.core.instrument.AbstractTimer;
import io.micrometer.core.instrument.Clock;
import io.micrometer.core.instrument.distribution.DistributionStatisticConfig;
import io.micrometer.core.instrument.distribution.pause.PauseDetector;
import io.micrometer.core.instrument.step.StepDouble;
import io.micrometer.core.instrument.util.TimeUtils;
import org.reactivestreams.Subscriber;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.DoubleAdder;
import java.util.concurrent.atomic.LongAdder;

public class StatsdTimer extends AbstractTimer {
    private final LongAdder count = new LongAdder();
    private final DoubleAdder totalTime = new DoubleAdder();
    private final StatsdLineBuilder lineBuilder;
    private final Subscriber subscriber;
    private StepDouble max;
    private volatile boolean shutdown = false;

    StatsdTimer(Id id, StatsdLineBuilder lineBuilder, Subscriber subscriber, Clock clock,
                DistributionStatisticConfig distributionStatisticConfig, PauseDetector pauseDetector, TimeUnit baseTimeUnit, long stepMillis) {
        super(id, clock, distributionStatisticConfig, pauseDetector, baseTimeUnit, false);
        this.max = new StepDouble(clock, stepMillis);
        this.lineBuilder = lineBuilder;
        this.subscriber = subscriber;
    }

    @Override
    protected void recordNonNegative(long amount, TimeUnit unit) {
        if (!shutdown && amount >= 0) {
            count.increment();

            double msAmount = TimeUtils.convert(amount, unit, TimeUnit.MILLISECONDS);
            totalTime.add(msAmount);

            // not necessary to ship max, as most StatsD agents calculate this themselves
            max.getCurrent().add(Math.max(msAmount - max.getCurrent().doubleValue(), 0));

            subscriber.onNext(lineBuilder.timing(msAmount));
        }
    }

    @Override
    public long count() {
        return count.longValue();
    }

    @Override
    public double totalTime(TimeUnit unit) {
        return TimeUtils.convert(totalTime.doubleValue(), TimeUnit.MILLISECONDS, unit);
    }

    /**
     * The StatsD agent will likely compute max with a different window, so the value may not match what you see here.
     * This value is not exported to the agent, and is only for diagnostic use.
     */
    @Override
    public double max(TimeUnit unit) {
        return TimeUtils.convert(max.poll(), TimeUnit.MILLISECONDS, unit);
    }

    void shutdown() {
        this.shutdown = true;
    }
}