package scsusers

import (
	"crypto/rand"
	"errors"
	"fmt"
	"math/big"
	"time"
)

func generate2fa() string {
	num, err := rand.Int(rand.Reader, big.NewInt(999999))
	if err != nil {
		return "918273"
	}
	return fmt.Sprintf("%06d", num)

}
func Validate2FA(u *UserData, challenge string) bool {
	v, ok := u.Get("2fa")
	return ok && v == challenge
}

func Send2FA(u *UserData) error {
	code := generate2fa()
	u.Set("2fa", code)
	u.Set("2faexpires", fmt.Sprintf("%d", time.Now().Add(15*time.Minute).Unix()))
	email,ok:=u.Get("email")
	if !ok {
		return errors.New("send2fa: no email")
	}
	firstname,ok:=u.Get("firstname")
	if !ok {
		return errors.New("send2fa: no firstname")
	}
	lastname,ok:=u.Get("lastname")
	if !ok {
		return errors.New("send2fa: no lastname")
	}
	fullname:=fmt.Sprintf("%s %s", firstname, lastname)
	return Send2faEmail(email, fullname, code)

}