package frpLogger

import (
	"fmt"
	"os"
	"os/exec"
	"runtime"
	"strings"
)

func GetInitSystem() string {
	if runtime.GOOS == "windows" {
		return "windows"
	}
	if runtime.GOOS == "linux" {
		if _, err := os.Stat("/run/systemd/system"); err == nil {
			return "systemd"
		}
		if _, err := os.Stat("/etc/init.d"); err == nil {
			return "init.d"
		}
	}
	return "unknown"
}

func IsInstanceRunning(instanceID int) bool {
	initType := GetInitSystem()
	serviceName, err := GetServiceNameByInstanceID(instanceID)
	if err != nil {
		return false
	}

	switch initType {
	case "windows":
		cmd := exec.Command("sc", "query", serviceName)
		output, err := cmd.CombinedOutput()
		if err != nil {
			return false
		}
		return strings.Contains(string(output), "RUNNING")

	case "systemd":
		cmd := exec.Command("systemctl", "is-active", serviceName)
		output, err := cmd.CombinedOutput()
		if err != nil {
			return false
		}
		return strings.TrimSpace(string(output)) == "active"

	case "init.d":
		servicePath := fmt.Sprintf("/etc/init.d/%s", serviceName)
		if _, err := os.Stat(servicePath); err != nil {
			return false
		}
		cmd := exec.Command(servicePath, "status")
		output, err := cmd.CombinedOutput()
		if err != nil {
			return false
		}
		return strings.Contains(string(output), "is running")

	default:
		return false
	}
}