package session

import (
	"log"
	"time"

	"badat.dev/maeqtt/v2/subscription"
)

type Expiry struct {
	ExpiryInterval time.Duration
	expireTimer    *time.Timer
	RemoveSessionChannel
}

func NewExpiry(channel RemoveSessionChannel) Expiry {
	expiry := Expiry{}

	expiry.RemoveSessionChannel = channel
	return expiry
}

// Channel for removing a session from the global state
type RemoveSessionChannel chan string

func (s *Session) expireSession() {
	log.Printf("Session: %v expired", *s.ClientID)
	subscription.Subscriptions.RemoveSubsForChannel(s.SubscriptionChannel)
	s.RemoveSessionChannel <- *s.ClientID
}

// newTime is nullable
func (e *Expiry) SetExpireTimerDuration(newTime *uint32) {
	expiry := uint32(0)
	if newTime != nil {
		expiry = *newTime
	} else {
		expiry = uint32(0)
	}
	e.ExpiryInterval = time.Second * time.Duration(expiry)
}

func (e *Expiry) startExpireTimer() {
	e.stopExpireTimer()
	e.expireTimer = time.NewTimer(e.ExpiryInterval)
}

func (e *Expiry) stopExpireTimer() {
	if e.expireTimer != nil {
		e.expireTimer.Stop()
	}
}

func (e *Expiry) expiryChannel() <- chan time.Time {
	if e.expireTimer != nil {
		return e.expireTimer.C
	} else {
		return nil
	}
}