// Copyright (C) 2024, The Duplicati Team
// https://duplicati.com, hello@duplicati.com
// 
// Permission is hereby granted, free of charge, to any person obtaining a 
// copy of this software and associated documentation files (the "Software"), 
// to deal in the Software without restriction, including without limitation 
// the rights to use, copy, modify, merge, publish, distribute, sublicense, 
// and/or sell copies of the Software, and to permit persons to whom the 
// Software is furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in 
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
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using System;
using System.Threading.Tasks;
using CoCoL;
using Duplicati.Library.Main.Volumes;

namespace Duplicati.Library.Main.Operation.Backup
{
    internal static class UploadRealFilelist
    {
        /// <summary>
        /// The tag used for log messages
        /// </summary>
        private static readonly string LOGTAG = Logging.Log.LogTagFromType(typeof(UploadRealFilelist));

        public static Task Run(BackupResults result, BackupDatabase db, Options options, FilesetVolumeWriter filesetvolume, long filesetid, Common.ITaskReader taskreader)
        {
            return AutomationExtensions.RunTask(new
            {
                Output = Channels.BackendRequest.ForWrite,
            },

            async self =>
            {
                if (!await taskreader.ProgressAsync)
                    return;
                
                // Update the reported source and backend changes
                using(new Logging.Timer(LOGTAG, "UpdateChangeStatistics", "UpdateChangeStatistics"))
                    await db.UpdateChangeStatisticsAsync(result);

                var changeCount = 
                    result.AddedFiles + result.ModifiedFiles + result.DeletedFiles +
                    result.AddedFolders + result.ModifiedFolders + result.DeletedFolders +
                    result.AddedSymlinks + result.ModifiedSymlinks + result.DeletedSymlinks;

                //Changes in the filelist triggers a filelist upload
                if (options.UploadUnchangedBackups || changeCount > 0)
                {
                    using(new Logging.Timer(LOGTAG, "UploadNewFileset", "Uploading a new fileset"))
                    {
                        if (!string.IsNullOrEmpty(options.ControlFiles))
                            foreach(var p in options.ControlFiles.Split(new char[] { System.IO.Path.PathSeparator }, StringSplitOptions.RemoveEmptyEntries))
                                filesetvolume.AddControlFile(p, options.GetCompressionHintFromFilename(p));

                        if (!await taskreader.ProgressAsync)
                            return;

                        await db.WriteFilesetAsync(filesetvolume, filesetid);
                        filesetvolume.Close();

                        if (!await taskreader.ProgressAsync)
                            return;
                        
                        await db.UpdateRemoteVolumeAsync(filesetvolume.RemoteFilename, RemoteVolumeState.Uploading, -1, null);
                        await db.CommitTransactionAsync("CommitUpdateRemoteVolume");
                        await self.Output.WriteAsync(new FilesetUploadRequest(filesetvolume));
                    }
                }
                else
                {
                    Logging.Log.WriteVerboseMessage(LOGTAG, "RemovingLeftoverTempFile", "removing temp files, as no data needs to be uploaded");
                    await db.RemoveRemoteVolumeAsync(filesetvolume.RemoteFilename);
                }

                await db.CommitTransactionAsync("CommitUpdateRemoteVolume");
            });
        }
    }
}