//go:build windows

package volsnap

import (
	"fmt"

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

// freeDiskBytes returns the bytes available to the caller on the volume backing
// path (used by the restore disk pre-check, C5). Windows is the dev platform;
// production runs on Linux (see disk_unix.go).
func freeDiskBytes(path string) (uint64, error) {
	p, err := windows.UTF16PtrFromString(path)
	if err != nil {
		return 0, fmt.Errorf("encode path %s: %w", path, err)
	}
	var freeAvail, total, totalFree uint64
	if err := windows.GetDiskFreeSpaceEx(p, &freeAvail, &total, &totalFree); err != nil {
		return 0, fmt.Errorf("GetDiskFreeSpaceEx %s: %w", path, err)
	}
	return freeAvail, nil
}