//go:build darwin

package main

import (
	"bytes"
	"fmt"
	"log"
	"net/http"
	"os"
	"os/exec"
	"os/signal"
	"path/filepath"
	"syscall"
	"time"

	"vpnclient/internal/apphost"
	"vpnclient/internal/config"
	"vpnclient/internal/core"
	"vpnclient/internal/update"
)

func main() {
	if update.MaybeFinishUpdate(os.Args[1:]) {
		return
	}
	update.CleanupStaleDownloads()
	log.SetFlags(log.LstdFlags | log.Lshortfile)

	cfgPath, err := config.LocateConfig()
	if err != nil {
		fatalf("Не удалось найти путь конфига: %v", err)
	}
	if _, err := os.Stat(cfgPath); os.IsNotExist(err) {
		if err := config.WriteExample(cfgPath); err != nil {
			fatalf("Не удалось создать конфиг: %v", err)
		}
	}
	cfg, err := config.Load(cfgPath)
	if err != nil {
		fatalf("Ошибка конфига %s: %v", cfgPath, err)
	}
	logBuf := &bytes.Buffer{}
	mgr, err := core.NewManager(cfgPath, cfg, logBuf)
	if err != nil {
		fatalf("%v", err)
	}

	a := apphost.New(mgr, cfgPath, logBuf)
	a.OpenURL = func(u string) error {
		return exec.Command("open", u).Start()
	}
	a.OnAfterUpdate = func() {
		go func() {
			time.Sleep(300 * time.Millisecond)
			os.Exit(0)
		}()
	}

	ln, uiURL, err := apphost.ListenLocal()
	if err != nil {
		fatalf("listen: %v", err)
	}
	srv := &http.Server{Handler: a.Handler()}
	go func() {
		_ = srv.Serve(ln)
	}()
	go a.AutoCheckUpdate()

	if err := openAppWindow(uiURL); err != nil {
		log.Printf("open UI: %v — откройте вручную: %s", err, uiURL)
		fmt.Println(uiURL)
	} else {
		log.Printf("Navis UI: %s", uiURL)
	}

	sig := make(chan os.Signal, 1)
	signal.Notify(sig, syscall.SIGINT, syscall.SIGTERM)
	<-sig
	_ = mgr.Disconnect()
	_ = srv.Close()
}

func openAppWindow(uiURL string) error {
	// Prefer Chromium-based --app window (looks like a desktop client).
	for _, app := range []string{"Google Chrome", "Chromium", "Microsoft Edge", "Brave Browser", "Arc"} {
		cmd := exec.Command("open", "-na", app, "--args", "--app="+uiURL, "--new-window")
		if err := cmd.Start(); err == nil {
			return nil
		}
	}
	// Fallback: default browser
	return exec.Command("open", uiURL).Start()
}

func fatalf(format string, args ...any) {
	msg := fmt.Sprintf(format, args...)
	log.Println(msg)
	_ = exec.Command("osascript", "-e", fmt.Sprintf(`display alert "Navis" message %q`, msg)).Run()
	os.Exit(1)
}

// Ensure we keep a reference for potential future dock icon path helpers.
var _ = filepath.Separator