package identity

import (
	"errors"

	"tug/internal/service/password"
	"tug/internal/storage"
)

const (
	PathLogin    = "login"
	PathSudo     = "sudo"
	PathPassword = "password"
)

var Paths = []string{PathLogin, PathSudo, PathPassword}

const (
	checkAccepted    = "accepted"
	checkRejected    = "rejected"
	checkLocked      = "locked"
	checkBusy        = "busy"
	checkUnavailable = "unavailable"
)

var CheckResults = []string{checkAccepted, checkRejected, checkLocked, checkBusy, checkUnavailable}

func discard(string, string) {}

func (s *Service) Observed(path string, observe func(path, result string)) *Service {
	if observe == nil {
		observe = discard
	}
	c := *s
	c.path, c.observe = path, observe
	return &c
}

func (s *Service) observed(user storage.User, err error) (storage.User, error) {
	s.observe(s.path, checkResult(err))
	return user, err
}

func checkResult(err error) string {
	switch {
	case err == nil:
		return checkAccepted
	case errors.Is(err, ErrRejected):
		return checkRejected
	case errors.Is(err, password.ErrBusy):
		return checkBusy
	}
	return checkUnavailable
}

func (s *Service) Observer() func(path, result string) {
	return s.observe
}