// Copyright (c) 2013, Suryandaru Triandana <syndtr@gmail.com>
// All rights reserved.
//
// Use of this source code is governed by a BSD-style license.

package main

import (
	"syscall"
	"unsafe"
)

var (
	modkernel32     = syscall.NewLazyDLL("kernel32.dll")
	procMoveFileExW = modkernel32.NewProc("MoveFileExW")
)

const _MOVEFILE_REPLACE_EXISTING = 1

func moveFileEx(from *uint16, to *uint16, flags uint32) error {
	r1, _, e1 := syscall.Syscall(procMoveFileExW.Addr(), 3, uintptr(unsafe.Pointer(from)), uintptr(unsafe.Pointer(to)), uintptr(flags))
	if r1 == 0 {
		if e1 != 0 {
			return error(e1)
		}
		return syscall.EINVAL
	}
	return nil
}

func rename(oldpath, newpath string) error {
	from, err := syscall.UTF16PtrFromString(oldpath)
	if err != nil {
		return err
	}
	to, err := syscall.UTF16PtrFromString(newpath)
	if err != nil {
		return err
	}
	return moveFileEx(from, to, _MOVEFILE_REPLACE_EXISTING)
}

func syncDir(name string) error { return nil }