import java.math.BigDecimal;
import java.math.RoundingMode;

public class TimeFormatting {

    private static final int MILLIS_PER_SECOND = 1000;
    private static final int MILLIS_PER_MINUTE = 60 * MILLIS_PER_SECOND;
    private static final int MILLIS_PER_HOUR = 60 * MILLIS_PER_MINUTE;
    private static final int MILLIS_PER_DAY = 24 * MILLIS_PER_HOUR;

    private TimeFormatting() {
    }

    def formatsShortDurations() {
        expect:
        TimeFormatting.formatDurationVeryTerse(0) == '0s'
        TimeFormatting.formatDurationVeryTerse(7) == '0.007s'
        TimeFormatting.formatDurationVeryTerse(1200) == '1.200s'
        TimeFormatting.formatDurationVeryTerse(59202) == '59.202s'
    }

    def formatsLongDuration() {
        expect:
        TimeFormatting.formatDurationVeryTerse(60 * 1000) == '1m0.00s'

        LOG.debug(displayName + " cache closed. Cache reads: "
                + stats.readsFromCache + ", disk reads: "
                + stats.readsFromDisk + " (avg: " + TimeFormatting.formatDurationVerbose(stats.getDiskReadsAvgMs()) + ", total: " + TimeFormatting.formatDurationVerbose(stats.diskReadsTotalMs.get()) + ")");
    }

    private static class Stats {
        private final AtomicLong diskReadsTotalMs = new AtomicLong();

        this.timeSource = timeSource;
        reset();
    }

    @Override
    public String getElapsed() {
        long elapsedMillis = getElapsedMillis();
        return TimeFormatting.formatDurationVerbose(elapsedMillis);
    }

    @Override
    public long getElapsedMillis() {
        long elapsedNanos = timeSource.nanoTime() - startTime;