package main

import (
	"log"
	"os"
	"runtime"
	"time"
)

const ProgramName = "go-daemon"

func checkExists(path string) (bool, error) {
	_, err := os.Stat(path)
	if err == nil {
		return true, nil
	}
	if os.IsNotExist(err) {
		return false, nil
	}
	return false, err
}

func main() {
	// A SAMPLE COMMAND FOR LOGGING OS INFORMATION TO A DEDICATED FILE
	// userhome, err := os.UserHomeDir() // TODO $HOME is not defined while running as daemon !!!
	// if err != nil {
	// 	log.Fatal(err)
	// }

	userhome := "/home/asandikci" // TEMPORARY
	configDir := userhome + "/.config/" + ProgramName + "/"
	// TODO Will be replaced with a Go Config Library

	if flag, err := checkExists(configDir); flag {
		// log.Println("Config dir already exists")
		if err != nil {
			log.Fatal(err)
		}
	} else if err := os.Mkdir(configDir, os.ModePerm); err != nil {
		log.Fatal(err)
	}

	osInfo := []struct {
		str1, str2 string
	}{
		{"OS", runtime.GOOS},
		{"Time", time.Now().Format("2006.01.02 15:04:05")},
	}

	f, err := os.Create(configDir + "daemon.conf")
	if err != nil {
		log.Fatal(err)
	}

	defer f.Close()

	for _, info := range osInfo {
		_, err := f.WriteString(info.str1 + ": " + info.str2 + "\n")
		if err != nil {
			log.Fatal(err)
		}
	}
}