package utilities

import (
	"math"
	"math/rand/v2"
	"time"
)

var (
	ApplyJitter = DefaultApplyJitter
)

func DefaultApplyJitter(pauseDuration time.Duration, jitter time.Duration) time.Duration {
	switch {
	case jitter == 0, pauseDuration == 0:
		return pauseDuration
	case jitter > pauseDuration:
		pauseDuration, jitter = jitter, pauseDuration
	}
	min := pauseDuration.Nanoseconds() - jitter.Nanoseconds()
	max := pauseDuration.Nanoseconds() + jitter.Nanoseconds()
	rnd := int64(math.Max(float64(rand.Int64N(max-min)+min), 0))
	return time.Duration(rnd)
}