bool CleanupSufficient(FolderContentStrategy folderContentStrategy, List <FileInfo> files, List <FileInfo> removedFiles)
{
switch (folderContentStrategy.DetectionStrategy)
{
case DetectionStrategy.ByCount:
return(files.Count - removedFiles.Count <= folderContentStrategy.Count);
case DetectionStrategy.BySize:
return(files.Sum(file => file.Length) - removedFiles.Sum(f => f.Length) <= folderContentStrategy.Size);
default:
throw new ArgumentException(nameof(folderContentStrategy.DetectionStrategy));
}
}
List <FileInfo> RemoveFilesByDateDsc(FolderContentStrategy folderContentStrategy, List <FileInfo> files)
{
var filesToRemove = new List <FileInfo>();
foreach (var file in files.OrderByDescending(f => f.CreationTimeUtc))
{
filesToRemove.Add(file);
if (CleanupSufficient(folderContentStrategy, files, filesToRemove))
{
break;
}
}
return(filesToRemove);
}
List <FileInfo> GetFilesToRemove(FolderContentStrategy folderContentStrategy)
{
var files = _fileSystemService.GetFilesInFolder(folderContentStrategy.Path);
switch (folderContentStrategy.CleanUpStrategy)
{
case CleanUpStrategy.ByDateAsc:
return(RemoveFilesByDateAsc(folderContentStrategy, files));
case CleanUpStrategy.ByDateDsc:
return(RemoveFilesByDateDsc(folderContentStrategy, files));
case CleanUpStrategy.BySize:
return(RemoveFilesBySize(folderContentStrategy, files));
}
return(new List <FileInfo>());
}
bool CleanupNecessary(FolderContentStrategy folderContentStrategy)
{
if (folderContentStrategy.DetectionStrategy == DetectionStrategy.BySize)
{
if (folderContentStrategy.Size < _fileSystemService.GetFolderContentSize(folderContentStrategy.Path))
{
return(true);
}
}
if (folderContentStrategy.DetectionStrategy == DetectionStrategy.ByCount)
{
if (folderContentStrategy.Count < _fileSystemService.GetFilesInFolder(folderContentStrategy.Path).Count)
{
return(true);
}
}
return(false);
}
public void EnsureFolderContent(FolderContentStrategy folderContentStrategy)
{
if (folderContentStrategy is null)
{
throw new ArgumentNullException(nameof(folderContentStrategy));
}
if (!_fileSystemService.DirectoryExists(folderContentStrategy.Path))
{
throw new FileNotFoundException();
}
var files = new List <FileInfo>();
if (CleanupNecessary(folderContentStrategy))
{
files = GetFilesToRemove(folderContentStrategy);
}
RemoveFiles(files);
}