package repository

import (
	"errors"

	"github.com/ascyii/qrank/src/utils"
)

func EnsureUniqueUsernameAndSlug(u *User) error {
	baseU := u.Username
	baseS := utils.Slugify(u.Username)
	for i := range 5 {
		candU := baseU
		candS := baseS
		if i > 0 {
			suffix := "-" + utils.MustRandToken(1)
			candU = baseU + suffix
			candS = baseS + suffix
		}
		var cnt int64
		db.Model(&User{}).Where("username = ?", candU).Count(&cnt)
		if cnt == 0 {
			db.Model(&User{}).Where("slug = ?", candS).Count(&cnt)
			if cnt == 0 {
				u.Username = candU
				u.Slug = candS
				return nil
			}
		}
	}
	return errors.New("cannot create unique username/slug")
}