package otp_test

import (
	"fmt"

	"dev.justinjudd.org/justin/otp"
)

type MapKey struct {
	Issuer, Label string
}

var keysMap map[MapKey]string

func CreateKey(issuer, username string) error {
	mapKey := MapKey{issuer, username}
	_, ok := keysMap[mapKey]
	if ok {
		return fmt.Errorf("Key already exists for Issuer:%s, Label:%s", issuer, username)
	}
	opts := otp.NewHOTPKeyOptions()
	opts.Issuer = issuer
	opts.Label = username
	k := otp.NewHOTPKey(opts)

	keysMap[mapKey] = k.URL()

	return nil
}

func CheckCode(issuer, username, code string) bool {
	mapKey := MapKey{issuer, username}
	keyURL, ok := keysMap[mapKey]
	if !ok {
		return false
	}
	k, err := otp.FromURL(keyURL)
	if err != nil {
		return false
	}
	return k.Verify(code)
}

func Example_hOTP() {
	CreateKey("example.com", "user1")
	CheckCode("example.com", "user1", "451556")

}