/** Exponential backoffs for reconnect timing.
 *
 * @author Steffen Vogel <post@steffenvogel.de>
 * @copyright 2014-2022, Institute for Automation of Complex Power Systems, EONERC
 * @license Apache 2.0
 *********************************************************************************/

package webrtc

import "time"

var DefaultExponentialBackoff = ExponentialBackoff{
	Factor:   1.5,
	Maximum:  1 * time.Minute,
	Initial:  1 * time.Second,
	Duration: 1 * time.Second,
}

type ExponentialBackoff struct {
	Factor  float32
	Maximum time.Duration
	Initial time.Duration

	Duration time.Duration
}

func (e *ExponentialBackoff) Next() time.Duration {
	e.Duration = time.Duration(1.5 * float32(e.Duration)).Round(time.Second)
	if e.Duration > e.Maximum {
		e.Duration = e.Maximum
	}

	return e.Duration
}

func (e *ExponentialBackoff) Reset() {
	e.Duration = e.Initial
}