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/**
 * Copyright (c) 2016-2022 Deephaven Data Labs and Patent Pending
 */
package io.deephaven.engine.table.impl.replay;

import io.deephaven.base.clock.Clock;
import io.deephaven.base.clock.ClockNanoBase;
import io.deephaven.time.DateTimeUtils;

import java.time.Instant;

public class FixedStepReplayer extends Replayer {

    private long incrementNanos;
    private Instant currentTime;

    public FixedStepReplayer(Instant startTime, Instant endTime, long incrementNanos) {
        super(startTime, endTime);
        this.incrementNanos = incrementNanos;
        currentTime = startTime;
    }

    @Override
    public void run() {
        currentTime = DateTimeUtils.plus(currentTime, incrementNanos);
        if (DateTimeUtils.epochNanos(currentTime) > DateTimeUtils.epochNanos(endTime)) {
            currentTime = endTime;
        }
        super.run();
    }

    @Override
    public void setTime(long updatedTime) {
        currentTime = DateTimeUtils.epochMillisToInstant(Math.max(updatedTime, currentTime.toEpochMilli()));
    }

    @Override
    public Clock clock() {
        return new ClockImpl();
    }

    private class ClockImpl extends ClockNanoBase {
        @Override
        public long currentTimeNanos() {
            return DateTimeUtils.epochNanos(currentTime);
        }
    }
}