private bool ValidateInputs()

in src/authoring/Elastic.Documentation.Refactor/Move.cs [165:234]
59 lines of code
12 McCabe index (conditional complexity)

	private bool ValidateInputs(string source, string target, out IFileInfo[] fromFiles, out IFileInfo[] toFiles)
	{
		fromFiles = [];
		toFiles = [];

		var fromFile = readFileSystem.FileInfo.New(source);
		var fromDirectory = readFileSystem.DirectoryInfo.New(source);
		var toFile = readFileSystem.FileInfo.New(target);
		var toDirectory = readFileSystem.DirectoryInfo.New(target);

		//from does not exist at all
		if (!fromFile.Exists && !fromDirectory.Exists)
		{
			if (!string.IsNullOrEmpty(fromFile.Extension))
				_logger.LogError("Source file '{File}' does not exist", fromFile);
			else
				_logger.LogError("Source directory '{Directory}' does not exist", fromDirectory);
			return false;
		}
		//moving file
		if (fromFile.Exists)
		{
			if (!fromFile.Extension.Equals(".md", OrdinalIgnoreCase))
			{
				_logger.LogError("Source path must be a markdown file. Directory paths are not supported yet");
				return false;
			}

			//if toFile has no extension assume move to folder
			if (toFile.Extension == string.Empty)
				toFile = readFileSystem.FileInfo.New(Path.Combine(toDirectory.FullName, fromFile.Name));

			if (!toFile.Extension.Equals(".md", OrdinalIgnoreCase))
			{
				_logger.LogError("Target path '{FullName}' must be a markdown file.", toFile.FullName);
				return false;
			}
			if (toFile.Exists)
			{
				_logger.LogError("Target file {Target} already exists", target);
				return false;
			}
			fromFiles = [fromFile];
			toFiles = [toFile];
		}
		//moving folder
		else if (fromDirectory.Exists)
		{
			if (toDirectory.Exists)
			{
				_logger.LogError("Target directory '{FullName}' already exists.", toDirectory.FullName);
				return false;
			}

			if (toDirectory.FullName.StartsWith(fromDirectory.FullName, OrdinalIgnoreCase))
			{
				_logger.LogError("Can not move source directory '{SourceDirectory}' to a '{TargetFile}'", toDirectory.FullName, toFile.FullName);
				return false;
			}

			fromFiles = fromDirectory.GetFiles("*.md", SearchOption.AllDirectories);
			toFiles = [.. fromFiles.Select(f =>
			{
				var relative = Path.GetRelativePath(fromDirectory.FullName, f.FullName);
				return readFileSystem.FileInfo.New(Path.Combine(toDirectory.FullName, relative));
			})];
		}

		return true;
	}