//go:build windows

package version

import (
	"errors"
	"os"

	"golang.org/x/sys/windows"
)

func lockFile(file *os.File) error {
	var overlapped windows.Overlapped
	return windows.LockFileEx(
		windows.Handle(file.Fd()),
		windows.LOCKFILE_EXCLUSIVE_LOCK|windows.LOCKFILE_FAIL_IMMEDIATELY,
		0,
		1,
		0,
		&overlapped,
	)
}

func unlockFile(file *os.File) error {
	var overlapped windows.Overlapped
	return windows.UnlockFileEx(windows.Handle(file.Fd()), 0, 1, 0, &overlapped)
}

func isLockContended(err error) bool {
	return errors.Is(err, windows.ERROR_LOCK_VIOLATION)
}

// Windows denies replacement of the opened lock file under its default share
// mode, so the file handle itself is the pathname anchor.
func openUpdateLockAnchor(string) (*os.File, error) { return nil, nil }
func releaseUpdateLockAnchor(*os.File) error        { return nil }

// Windows does not expose a portable directory fsync operation. Every file is
// flushed before rename; the rename itself is the strongest available step
// here without opening directory handles using backup semantics.
func syncDirectory(string) error { return nil }