package main

import (
	"flag"
	"fmt"
	"io/ioutil"
	"log"
	"net"
	"net/http"
	"strings"
)

var (
	verbal = flag.Bool("v", true, "Enable verbal output")
)

func main() {
	flag.Parse()
	publicIp := strings.TrimSpace(getPublicIP())
	domains := GetFreeDomain(publicIp)
	if *verbal {
		fmt.Println("Your public IP address is: ", publicIp)
		fmt.Println("Your free domain assigned by ISP is: ", domains)
	} else {
		if len(domains) > 0 {
			out := domains[0]
			if out[len(out)-1:] == "." {
				out = out[:len(out)-1]
			}
			fmt.Println(out)
		}
	}

}

func getPublicIP() string {
	//http://checkip.amazonaws.com/
	resp, err := http.Get("https://api.ipify.org/")
	if err != nil {
		log.Fatalln(err)
	}
	//We Read the response body on the line below.
	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		log.Fatalln(err)
	}
	//Convert the body to type string
	sb := string(body)
	return sb
}

func GetFreeDomain(ipaddr string) []string {
	ptr, _ := net.LookupAddr(ipaddr)
	return ptr
}