/*
 *
 * (c) Copyright Ascensio System Limited 2010-2018
 *
 * This program is freeware. You can redistribute it and/or modify it under the terms of the GNU 
 * General Public License (GPL) version 3 as published by the Free Software Foundation (https://www.gnu.org/copyleft/gpl.html). 
 * In accordance with Section 7(a) of the GNU GPL its Section 15 shall be amended to the effect that 
 * Ascensio System SIA expressly excludes the warranty of non-infringement of any third-party rights.
 *
 * THIS PROGRAM IS DISTRIBUTED WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY OR
 * FITNESS FOR A PARTICULAR PURPOSE. For more details, see GNU GPL at https://www.gnu.org/copyleft/gpl.html
 *
 * You can contact Ascensio System SIA by email at sales@onlyoffice.com
 *
 * The interactive user interfaces in modified source and object code versions of ONLYOFFICE must display 
 * Appropriate Legal Notices, as required under Section 5 of the GNU GPL version 3.
 *
 * Pursuant to Section 7 § 3(b) of the GNU GPL you must retain the original ONLYOFFICE logo which contains 
 * relevant author attributions when distributing the software. If the display of the logo in its graphic 
 * form is not reasonably feasible for technical reasons, you must include the words "Powered by ONLYOFFICE" 
 * in every copy of the program you distribute. 
 * Pursuant to Section 7 § 3(e) we decline to grant you any rights under trademark law for use of our trademarks.
 *
*/


using System.Collections.Generic;

using ASC.Core.Users;

namespace ASC.Web.Core.Users
{
    public class UserInfoComparer : IComparer<UserInfo>
    {
        public static readonly IComparer<UserInfo> Default = new UserInfoComparer(UserSortOrder.DisplayName, false);
        public static readonly IComparer<UserInfo> FirstName = new UserInfoComparer(UserSortOrder.FirstName, false);
        public static readonly IComparer<UserInfo> LastName = new UserInfoComparer(UserSortOrder.LastName, false);


        public UserSortOrder SortOrder { get; set; }
        public bool Descending { get; set; }


        public UserInfoComparer(UserSortOrder sortOrder)
            : this(sortOrder, false)
        {
        }

        public UserInfoComparer(UserSortOrder sortOrder, bool descending)
        {
            SortOrder = sortOrder;
            Descending = descending;
        }


        public int Compare(UserInfo x, UserInfo y)
        {
            var result = 0;
            switch (SortOrder)
            {
                case UserSortOrder.DisplayName:
                    result = UserFormatter.Compare(x, y, DisplayUserNameFormat.Default);
                    break;
                case UserSortOrder.FirstName:
                    result = UserFormatter.Compare(x, y, DisplayUserNameFormat.FirstLast);
                    break;
                case UserSortOrder.LastName:
                    result = UserFormatter.Compare(x, y, DisplayUserNameFormat.LastFirst);
                    break;
            }

            return !Descending ? result : -result;
        }
    }
}