package registry

import "syscall"

const (
	_REG_OPTION_NON_VOLATILE = 0

	_REG_CREATED_NEW_KEY     = 1
	_REG_OPENED_EXISTING_KEY = 2

	_ERROR_NO_MORE_ITEMS syscall.Errno = 259
)

//sys	regCreateKeyEx(key syscall.Handle, subkey *uint16, reserved uint32, class *uint16, options uint32, desired uint32, sa *syscall.SecurityAttributes, result *syscall.Handle, disposition *uint32) (regerrno error) = advapi32.RegCreateKeyExW

	procRegSetValueExW            = modadvapi32.NewProc("RegSetValueExW")
	procExpandEnvironmentStringsW = modkernel32.NewProc("ExpandEnvironmentStringsW")
)

func regCreateKeyEx(key syscall.Handle, subkey *uint16, reserved uint32, class *uint16, options uint32, desired uint32, sa *syscall.SecurityAttributes, result *syscall.Handle, disposition *uint32) (regerrno error) {

// The access parameter specifies the access rights for the key
// to be created.
func CreateKey(k Key, path string, access uint32) (newk Key, openedExisting bool, err error) {
	var h syscall.Handle
	var d uint32
	err = regCreateKeyEx(syscall.Handle(k), syscall.StringToUTF16Ptr(path),
		0, nil, _REG_OPTION_NON_VOLATILE, access, nil, &h, &d)
	if err != nil {
		return 0, false, err
	}
	return Key(h), d == _REG_OPENED_EXISTING_KEY, nil
}