package scsusers

import (
	"crypto/rand"
	"fmt"
	"math/big"
	"strconv"
	"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 {
	defer func() {
		u.Delete("2fa")
		u.Delete("2faexpires")
	}()

	v, ok := u.Get("2fa")
	if !ok {
		return false
	}

	exp, ok := u.Get("2faexpires")
	if !ok {

		return false
	}
	tmp, err := strconv.ParseInt(exp, 10, 64)
	if err != nil {
		return false
	}
	if int64(time.Now().Unix()) > tmp {
		return false

	}
	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()))
	firstname, _ := u.Get("firstname")
	lastname, _ := u.Get("lastname")
	fullname := fmt.Sprintf("%s %s", firstname, lastname)
	return Send2faEmail(u.Username, fullname, code)

}