// (c) Copyright Ascensio System SIA 2010-2022
//
// This program is a free software product.
// You can redistribute it and/or modify it under the terms
// of the GNU Affero General Public License (AGPL) version 3 as published by the Free Software
// Foundation. In accordance with Section 7(a) of the GNU AGPL 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 details, see
// the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
//
// You can contact Ascensio System SIA at Lubanas st. 125a-25, Riga, Latvia, EU, LV-1021.
//
// The  interactive user interfaces in modified source and object code versions of the Program must
// display Appropriate Legal Notices, as required under Section 5 of the GNU AGPL version 3.
//
// Pursuant to Section 7(b) of the License you must retain the original Product logo when
// distributing the program. Pursuant to Section 7(e) we decline to grant you any rights under
// trademark law for use of our trademarks.
//
// All the Product's GUI elements, including illustrations and icon sets, as well as technical writing
// content are licensed under the terms of the Creative Commons Attribution-ShareAlike 4.0
// International. See the License terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode

namespace ASC.Data.Backup;

[Scope]
public class Schedule
{
    private readonly TenantManager _tenantManager;
    private readonly ILogger<Schedule> _logger;
    private readonly TenantUtil _tenantUtil;

    public Schedule(ILogger<Schedule> options, TenantManager tenantManager, TenantUtil tenantUtil)
    {
        _logger = options;
        _tenantManager = tenantManager;
        _tenantUtil = tenantUtil;
    }

    public bool IsToBeProcessed(BackupSchedule backupSchedule)
    {
        try
        {
            var cron = new CronExpression(backupSchedule.Cron);
            var tenant = _tenantManager.GetTenant(backupSchedule.TenantId);
            var tenantTimeZone = tenant.TimeZone;
            var culture = tenant.GetCulture();
            Thread.CurrentThread.CurrentCulture = culture;

            var lastBackupTime = backupSchedule.LastBackupTime.Equals(default)
                ? DateTime.UtcNow.Date.AddSeconds(-1)
                : _tenantUtil.DateTimeFromUtc(tenantTimeZone, backupSchedule.LastBackupTime);

            var nextBackupTime = cron.GetTimeAfter(lastBackupTime);

            if (!nextBackupTime.HasValue)
            {
                return false;
            }

            var now = _tenantUtil.DateTimeFromUtc(tenantTimeZone, DateTime.UtcNow);

            return nextBackupTime <= now;
        }
        catch (Exception e)
        {
            _logger.ErrorSchedule(backupSchedule.TenantId, e);

            return false;
        }
    }
}