module std::io::os @if(env::POSIX);
import std::io, std::os, libc;

<*
 @require dir.str_view().len > 0
*>
fn void? native_rmtree(Path dir)
{
	@pool()
	{
		DIRPtr directory = posix::opendir(dir.str_view().zstr_tcopy());
		defer if (directory) posix::closedir(directory);
		if (!directory) return path::is_dir(dir) ? io::CANNOT_READ_DIR~ : io::FILE_NOT_DIR~;
		Posix_dirent* entry;
		while ((entry = posix::readdir(directory)))
		{
			@pool()
			{
				String name = ((ZString)&entry.name).str_view();
				if (!name || name == "." || name == "..") continue;
				Path new_path = dir.tappend(name)!;
				if (entry.d_type == posix::DT_DIR)
				{
					native_rmtree(new_path)!;
					continue;
				}
				if (libc::remove(new_path.str_view().zstr_tcopy()))
				{
					// TODO improve
					return io::GENERAL_ERROR~;
				}
			};
		}
		os::native_rmdir(dir)!;
	};
}

module std::io::os @if(env::WIN32);
import std::io, std::time, std::os;

fn void? native_rmtree(Path path)
{
	Win32_WIN32_FIND_DATAW find_data;
	String s = path.str_view().tconcat("\\*");
	Win32_HANDLE find = win32::findFirstFileW(s.to_temp_utf16(), &find_data)!;

	if (find == win32::INVALID_HANDLE_VALUE) return io::CANNOT_READ_DIR~;
	defer win32::findClose(find);
	do
	{
		@pool()
		{
			String filename = string::tfrom_wstring((WString)&find_data.cFileName)!;
			if (filename == "." || filename == "..") continue;
			Path file_path = path.tappend(filename)!;
			if (find_data.dwFileAttributes & win32::FILE_ATTRIBUTE_DIRECTORY)
			{
				native_rmtree(file_path)!;
			}
			else
			{
				win32::deleteFileW(file_path.str_view().to_temp_wstring()!!);
			}
		};
	} while (win32::findNextFileW(find, &find_data) != 0);
	os::native_rmdir(path)!;
}