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Client library for working with the NATS messaging system.
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// Copyright 2015-2018 The NATS Authors
// 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.

// Copied from the old client for consistency

package io.nats.examples.benchmark;

import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.List;

class SampleGroup extends Sample {
    private final List samples = new ArrayList();

    SampleGroup(SampleGroup... groups) {
        for (SampleGroup g : groups) {
            for (Sample stat : g.samples) {
                addSample(stat);
            }
        }
    }

    public final List getSamples() {
        return samples;
    }

    /**
     * Adds a sample to the group.
     *
     * @param stat the sample to add
     */
    public void addSample(Sample stat) {
        samples.add(stat);
        if (samples.size() == 1) {
            start = stat.start;
            end = stat.end;
        }
        this.ioBytes += stat.ioBytes;
        this.jobMsgCnt += stat.jobMsgCnt;
        this.msgCnt += stat.msgCnt;
        this.msgBytes += stat.msgBytes;
        this.start = Math.min(this.start, stat.start);
        this.end = Math.max(this.end, stat.end);
    }

    /**
     * Returns the minimum of the message rates in the SampleGroup.
     *
     * @return the minimum of the message rates in the SampleGroup
     */
    public long minRate() {
        long min = (samples.isEmpty() ? 0L : samples.get(0).rate());
        for (Sample s : samples) {
            min = Math.min(min, s.rate());
        }
        return min;
    }

    /**
     * Returns the maximum of the message rates in the SampleGroup.
     *
     * @return the maximum of the message rates in the SampleGroup
     */
    public long maxRate() {
        long max = (samples.isEmpty() ? 0L : samples.get(0).rate());
        for (Sample s : samples) {
            max = Math.max(max, s.rate());
        }
        return max;
    }

    /**
     * Returns the average of the message rates in the SampleGroup.
     *
     * @return the average of the message rates in the SampleGroup
     */
    public long avgRate() {
        long sum = 0L;
        for (Sample s : samples) {
            sum += s.rate();
        }
        return sum / (long) samples.size();
    }

    /**
     * Returns the standard deviation of the message rates in the SampleGroup.
     *
     * @return the standard deviation of the message rates in the SampleGroup
     */
    public double stdDev() {
        double avg = avgRate();
        double sum = 0.0;
        for (Sample s : samples) {
            sum += Math.pow((double) s.rate() - avg, 2);
        }
        double variance = sum / (double) samples.size();
        return Math.sqrt(variance);
    }

    /**
     * Formats the statistics for this group in a human-readable format.
     *
     * @return the statistics for this group in a human-readable format (string)
     */
    public String statistics() {
        DecimalFormat formatter = new DecimalFormat("#,###");
        DecimalFormat floatFormatter = new DecimalFormat("#,###.00");
        return String.format("min %s | avg %s | max %s | stddev %s msgs",
                formatter.format(minRate()), formatter.format(avgRate()),
                formatter.format(maxRate()), floatFormatter.format(stdDev()));
    }

    boolean hasSamples() {
        return !samples.isEmpty();
    }

}