package windows

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

const (
	NULL  = 0
	MB_OK = 0
)

func Fatal(title, message string, exitCode int) {
	messageBox(NULL, message, title, MB_OK)
	os.Exit(exitCode)
}

// MessageBox of Win32 API.
func messageBox(hwnd uintptr, caption, title string, flags uint) int {
	_caption, err := syscall.UTF16PtrFromString(caption)
	if err != nil {
		panic(err)
	}
	_title, err := syscall.UTF16PtrFromString(title)
	if err != nil {
		panic(err)
	}
	ret, _, _ := syscall.NewLazyDLL("user32.dll").NewProc("MessageBoxW").Call(
		uintptr(hwnd),
		uintptr(unsafe.Pointer(_caption)),
		uintptr(unsafe.Pointer(_title)),
		uintptr(flags))

	return int(ret)
}