/* openbills - Server for web based Libre Billing Software
 * Copyright (C) 2023-2024  Vidhu Kant Sharma <vidhukant@vidhukant.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

package util

import (
	"regexp"
	"net/mail"
	"net/url"
)

var phoneRegex, gstinRegex *regexp.Regexp
func init() {
	phoneRegex = regexp.MustCompile(`^(?:(?:\(?(?:00|\+)([1-4]\d\d|[1-9]\d?)\)?)?[\-\.\ \\\/]?)?((?:\(?\d{1,}\)?[\-\.\ \\\/]?){0,})(?:[\-\.\ \\\/]?(?:#|ext\.?|extension|x)[\-\.\ \\\/]?(\d+))?$`)
	gstinRegex = regexp.MustCompile(`^[0-9]{2}[A-Z]{5}[0-9]{4}[A-Z]{1}[1-9A-Z]{1}Z[0-9A-Z]{1}$`)
}

func ValidateEmail(email string) bool {
	_, err := mail.ParseAddress(email)
	if err != nil {
		return false
	}
  return true
}

func ValidateWebsite(website string) bool {
	_, err := url.ParseRequestURI(website)
	if err != nil {
		return false
	}
  return true
}

func ValidateGstin(gstin string) bool {
	return gstinRegex.MatchString(gstin)
}

func ValidatePhone(phone string) bool {
  return phoneRegex.MatchString(phone)
}