/* openbills - Server for web based Libre Billing Software
 * Copyright (C) 2023-2025  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 user

import (
	"strings"
	"github.com/spf13/viper"
	"vidhukant.com/openbills/errors"
	"vidhukant.com/openbills/util"
)

func validatePassword(pass string) error {
	// check if password is too short
	if len(pass) < viper.GetInt("security.min_password_length") {
		return errors.ErrPasswordTooShort
	}

	// check if password is too long
	if len(pass) > viper.GetInt("security.max_password_length") {
		return errors.ErrPasswordTooLong
	}

	return nil
}

func validateUsername(username string) error {
	// check if username is too short
	if len(username) < 2 {
		return errors.ErrUsernameTooShort
	}

	// check if username is too long
	if len(username) > 32 {
		return errors.ErrUsernameTooLong
	}
 
	// (11th October 2025) what the fuck even is this 
	// I'm not even deleting this I can't stop laughing
  // 
  // for _, char := range username {
  //   if !strings.Contains(username, string(char)) {
  //     return errors.ErrInvalidUsername
  //   }
  // }

  return nil
}

func (u *User) validate() error {
	u.Email = strings.TrimSpace(u.Email)
  u.Username = strings.TrimSpace(u.Username)

	// don't accept empty username
  if u.Username == "" {
    return errors.ErrEmptyUsername
  } else {
    // validate username
    err := validateUsername(u.Username)
    if err != nil {
      return err
    }
  }

  // don't accept empty email
  if u.Email == "" {
    return errors.ErrEmptyEmail
  } else {
    // validate email
    if !util.ValidateEmail(u.Email) {
      return errors.ErrInvalidEmail
    }
  }

  // validate password
  err := validatePassword(u.Password)
  if err != nil {
    return err
  }

	return nil
}