package creds

import "fmt"

type Mode string

const (
	Auto   Mode = "auto"
	Online Mode = "online"
	Local  Mode = "local"
)

func ParseMode(s string) (Mode, error) {
	switch Mode(s) {
	case Auto, Online, Local:
		return Mode(s), nil
	default:
		return "", fmt.Errorf("invalid mode %q: want \"auto\", \"online\" or \"local\"", s)
	}
}

func Resolve(mode Mode) Mode {
	if mode != Auto {
		return mode
	}
	if HasLocalData() {
		return Local
	}
	return Online
}