// Vikunja is a to-do list application to facilitate your life.
// Copyright 2018-2021 Vikunja and contributors. All rights reserved.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public Licensee 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 Affero General Public Licensee for more details.
//
// You should have received a copy of the GNU Affero General Public Licensee
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

package models

import (
	"regexp"
	"strings"

	"code.vikunja.io/api/pkg/user"

	"xorm.io/xorm"
)

func FindMentionedUsersInText(s *xorm.Session, text string) (users map[int64]*user.User, err error) {
	reg := regexp.MustCompile(`@\w+`)
	matches := reg.FindAllString(text, -1)
	if matches == nil {
		return
	}

	usernames := []string{}
	for _, match := range matches {
		usernames = append(usernames, strings.TrimPrefix(match, "@"))
	}

	return user.GetUsersByUsername(s, usernames, true)
}
