package main

import (
	"os"
	"os/exec"
	"path/filepath"
	"syscall"

	"fyne.io/fyne/v2/app"
	"fyne.io/fyne/v2/container"
	"fyne.io/fyne/v2/widget"
	"fyne.io/fyne/v2"
)

var currentProcess *exec.Cmd

// checkSingBox checks if sing-box.exe exists in the bin folder
func checkSingBox() bool {
	singBoxPath := filepath.Join("bin", "sing-box.exe")
	if _, err := os.Stat(singBoxPath); os.IsNotExist(err) {
		return false
	}
	return true
}

// runSingBox starts the sing-box process with the given config path
func runSingBox(configPath string) error {
	singBoxPath := filepath.Join("bin", "sing-box.exe")

	if !checkSingBox() {
		return nil
	}

	cmd := exec.Command(singBoxPath, "run", "-c", configPath)

	// Make the process run as hidden
	cmd.SysProcAttr = &syscall.SysProcAttr{
		HideWindow: true,
	}

	err := cmd.Start()
	if err != nil {
		return err
	}

	currentProcess = cmd
	return nil
}

// killCurrentProcess terminates the current sing-box process if running
func killCurrentProcess() {
	if currentProcess != nil && currentProcess.Process != nil {
		currentProcess.Process.Kill()
		currentProcess = nil
	}
}

func main() {
	myApp := app.New()
	myWindow := myApp.NewWindow("Hamy VPN Client")
	myWindow.Resize(fyne.NewSize(200, 300))

	var connectButton *widget.Button
	var disconnectButton *widget.Button

	disconnectButton = widget.NewButton("Отключить", func() {
		killCurrentProcess()

		statusLabel := widget.NewLabel("Отключено")
		myWindow.SetContent(container.NewVBox(
			connectButton,
			disconnectButton,
			statusLabel,
		))
	})

	connectButton = widget.NewButton("Подключить", func() {
		// Check if sing-box exists
		if !checkSingBox() {
			errorLabel := widget.NewLabel("Файл bin/sing-box.exe не найден")
			myWindow.SetContent(container.NewVBox(
				connectButton,
				disconnectButton,
				errorLabel,
			))
			return
		}

		// Run sing-box with a sample config file
		err := runSingBox("config.json") // Replace with actual config path
		if err != nil {
			errorLabel := widget.NewLabel("Ошибка подключения: " + err.Error())
			myWindow.SetContent(container.NewVBox(
				connectButton,
				disconnectButton,
				errorLabel,
			))
			return
		}

		connectLabel := widget.NewLabel("Подключено")
		myWindow.SetContent(container.NewVBox(
			connectButton,
			disconnectButton,
			connectLabel,
		))
	})

	myWindow.SetContent(container.NewVBox(
		connectButton,
		disconnectButton,
	))

	myWindow.ShowAndRun()
}