//go:build windows

package instance

import (
	"os"
	"syscall"
)

var (
	kernel32        = syscall.NewLazyDLL("kernel32.dll")
	procFreeConsole = kernel32.NewProc("FreeConsole")
	user32          = syscall.NewLazyDLL("user32.dll")
	procShowWindow  = user32.NewProc("ShowWindow")
)

const swHide = 0

// HideConsole hides any console window and detaches from it.
func HideConsole() {
	hwnd, _, _ := kernel32.NewProc("GetConsoleWindow").Call()
	if hwnd != 0 {
		_, _, _ = procShowWindow.Call(hwnd, swHide)
	}
	_, _, _ = procFreeConsole.Call()
	redirectStdioToNul()
}

func redirectStdioToNul() {
	nul, err := os.OpenFile("NUL", os.O_RDWR, 0)
	if err != nil {
		return
	}
	os.Stdin = nul
	os.Stdout = nul
	os.Stderr = nul
}