package reach

import (
	"sync"

	"forge.cadoles.com/Pyxis/golang-socketio"
	"github.com/pkg/errors"
)

const (
	eventIsReceiverUpgradeAvailable = "is receiver upgrade available"
	eventReceiverUpgradeAvailable   = "receiver upgrade available"
)

type receiverUpgreAvailable struct {
	Available bool `json:"available"`
	Running   bool `json:"running"`
}

// ReceiverUpgradeAvailable checks if an upgrade is avaialable/running for the ReachRS module
func (u *Updater) ReceiverUpgradeAvailable() (available bool, running bool, err error) {

	var wg sync.WaitGroup

	wg.Add(1)

	err = u.conn.On(eventReceiverUpgradeAvailable, func(h *gosocketio.Channel, up *receiverUpgreAvailable) {
		available = up.Available
		running = up.Running
		u.conn.Off(eventReceiverUpgradeAvailable)
		wg.Done()
	})
	if err != nil {
		return false, false, errors.Wrapf(err, "error while binding to '%s' event", eventReceiverUpgradeAvailable)
	}

	u.logf("sending '%s' event", eventIsReceiverUpgradeAvailable)
	if err = u.conn.Emit(eventIsReceiverUpgradeAvailable, nil); err != nil {
		return false, false, errors.Wrapf(err, "error while emitting '%s' event", eventIsReceiverUpgradeAvailable)
	}
	u.logf("'%s' event sent", eventIsReceiverUpgradeAvailable)

	wg.Wait()

	u.logf("receiver upgrade result: available: %v, running: %v", available, running)

	return available, running, err

}