OneDriveBackupService/OneDrive/OneDriveClient.cs

using OneDriveBackupService.Models;

namespace OneDriveBackupService.OneDrive;

public sealed class OneDriveClient(ConfigData config) {
    public void UploadFile(string filePath) {
        Directory.CreateDirectory(config.BackupUploadRoot);
        var destFileName = Path.Combine(config.BackupUploadRoot, Path.GetFileName(filePath));
        File.Move(filePath, destFileName);
    }

    public int DeleteOldFiles() {
        var directory = new DirectoryInfo(config.BackupUploadRoot);

        var filesToDelete = directory.EnumerateFiles()
            .Where(f => f.Name.StartsWith("backup_") && f.Name.EndsWith(".tar.gz"))
            .OrderByDescending(f => f.CreationTimeUtc)
            .Skip(config.KeepLast)
            .ToArray();
        
        foreach (var file in filesToDelete) {
            file.Delete();
        }

        return filesToDelete.Length;
    }
}