//go:build windows

package config

import (
	"os"
	"syscall"
	"unsafe"
)

var moveFileEx = syscall.NewLazyDLL("kernel32.dll").NewProc("MoveFileExW")

func replaceFile(source, destination string) error {
	sourcePtr, err := syscall.UTF16PtrFromString(source)
	if err != nil {
		return err
	}
	destinationPtr, err := syscall.UTF16PtrFromString(destination)
	if err != nil {
		return err
	}
	result, _, callErr := moveFileEx.Call(
		uintptr(unsafe.Pointer(sourcePtr)),
		uintptr(unsafe.Pointer(destinationPtr)),
		0x1|0x8, // MOVEFILE_REPLACE_EXISTING | MOVEFILE_WRITE_THROUGH
	)
	if result == 0 {
		if callErr != syscall.Errno(0) {
			return callErr
		}
		return os.ErrInvalid
	}
	return nil
}