package periodic

import (
	"time"
)

// Periodic item
type Periodic struct {
	ticker   *time.Ticker
	quit     chan bool
	callback Func
}

// Func type for Periodic callback after every tick
type Func func()

// New create new periodic function callback background goroutine ticker
func New(f Func, d time.Duration) *Periodic {
	if f == nil {
		return nil
	}

	p := Periodic{}
	p.ticker = time.NewTicker(d)
	p.quit = make(chan bool)
	p.callback = f

	go func() {
		for {
			select {
			case <-p.ticker.C:
				p.callback()
			case <-p.quit:
				p.ticker.Stop()
				return
			}
		}
	}()

	return &p
}

// Stop signals the periodic goroutine
func (p *Periodic) Stop() {
	p.quit <- true
}