// (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.Web.Studio.Core.Backup;

public class BackupFileUploadHandler
{
    private const long MaxBackupFileSize = 1024L * 1024L * 1024L;
    public BackupFileUploadHandler(RequestDelegate next)
    {

    }

    public async Task Invoke(HttpContext context,
        PermissionContext permissionContext,
        BackupAjaxHandler backupAjaxHandler)
    {
        FileUploadResult result;
        try
        {
            if (context.Request.Form.Files.Count == 0)
            {
                result = Error("No files.");
            }

            if (!permissionContext.CheckPermissions(SecutiryConstants.EditPortalSettings))
            {
                result = Error("Access denied.");
            }

            var file = context.Request.Form.Files[0];

            if (file.Length <= 0 || file.Length > MaxBackupFileSize)
            {
                result = Error($"File size must be greater than 0 and less than {MaxBackupFileSize} bytes");
            }


            var filePath = backupAjaxHandler.GetTmpFilePath();

            if (File.Exists(filePath))
            {
                File.Delete(filePath);
            }

            using (var fileStream = File.Create(filePath))
            {
                await file.CopyToAsync(fileStream);
            }

            result = Success();
        }
        catch (Exception error)
        {
            result = Error(error.Message);
        }

        await context.Response.WriteAsync(System.Text.Json.JsonSerializer.Serialize(result));
    }

    private FileUploadResult Success()
    {
        return new FileUploadResult
        {
            Success = true
        };
    }

    private FileUploadResult Error(string messageFormat, params object[] args)
    {
        return new FileUploadResult
        {
            Success = false,
            Message = string.Format(messageFormat, args)
        };
    }
}

public static class BackupFileUploadHandlerExtensions
{
    public static IApplicationBuilder UseBackupFileUploadHandler(this IApplicationBuilder builder)
    {
        return builder.UseMiddleware<BackupFileUploadHandler>();
    }
}