package utils

import (
	"crypto/hmac"
	"crypto/sha256"
	"encoding/hex"
	"fmt"
	"net/mail"
	"time"
)

func IsValidEmail(email string) bool {
	_, err := mail.ParseAddress(email)
	return err == nil
}

// Try multiple accepted date formats
var birthdayFormats = []string{
	"2006-01-02", // ISO: 1999-12-12
	"02.01.2006", // D.M.Y: 12.12.1999
	"2.1.2006",   // D.M.Y without leading zeros: 1.2.1999
}

func IsValidBirthday(birthday string) bool {
	for _, layout := range birthdayFormats {
		if _, err := time.Parse(layout, birthday); err == nil {
			return true
		}
	}
	return false
}

func GetCurrentTime(loc *time.Location) string {
	return time.Now().In(loc).Format("2006-01-02 15:04:05")
}

func GetCurrentDay(loc *time.Location) string {
	return fmt.Sprint(time.Now().In(loc).Weekday())
}

func HashField(field string, token []byte) string {
	h := hmac.New(sha256.New, token)
	h.Write([]byte(field))
	return hex.EncodeToString(h.Sum(nil))
}