// Copyright (C) 2026, 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"),
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// 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
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//
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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using System.Threading.Tasks;
using Duplicati.Library.Main.Operation.Common;

namespace Duplicati.Library.Main.Operation.Backup;

internal static class RecreateMissingIndexFiles
{
	/// <summary>
	/// The tag used for log messages
	/// </summary>
	private static readonly string LOGTAG = Logging.Log.LogTagFromType(typeof(RecreateMissingIndexFiles));

	public static async Task Run(BackupDatabase database, IBackendManager backendManager, Options options, ITaskReader taskreader)
	{
		if (options.IndexfilePolicy != Options.IndexFileStrategy.None)
		{
			var anyfiles = false;
			await foreach (var blockfile in (await database.GetMissingIndexFilesAsync(taskreader.ProgressToken).ConfigureAwait(false)).ConfigureAwait(false))
			{
				if (!await taskreader.ProgressRendevouz().ConfigureAwait(false))
					return;

				Logging.Log.WriteInformationMessage(LOGTAG, "RecreateMissingIndexFile", "Re-creating missing index file for {0}", blockfile);
				var w = await Common.IndexVolumeCreator.CreateIndexVolume(blockfile, options, database, taskreader.ProgressToken).ConfigureAwait(false);

				if (!await taskreader.ProgressRendevouz().ConfigureAwait(false))
					return;

				anyfiles = true;
				await database.UpdateRemoteVolumeAsync(w.RemoteFilename, RemoteVolumeState.Uploading, -1, null, false, default, null, taskreader.ProgressToken).ConfigureAwait(false);

				if (options.Dryrun)
				{
					Logging.Log.WriteDryrunMessage(LOGTAG, "WouldUploadFile", "Would upload file: {0}", w.RemoteFilename);
				}
				else
				{
					await database.CommitTransactionAsync("RecreateMissingIndexFile", true, taskreader.ProgressToken).ConfigureAwait(false);
					await backendManager.PutAsync(w, null, null, false, () => database.FlushBackendMessagesAndCommitAsync(backendManager, taskreader.ProgressToken), taskreader.ProgressToken).ConfigureAwait(false);
				}
			}

			// If we uploaded/fixed any files, make sure the backup does not start before the files are settled
			if (anyfiles)
			{
				await backendManager.WaitForEmptyAsync(taskreader.ProgressToken).ConfigureAwait(false);
				await database.FlushBackendMessagesAndCommitAsync(backendManager, taskreader.ProgressToken).ConfigureAwait(false);
			}
		}
	}

}

