package main

import (
	"bytes"
	"encoding/json"
	"flag"
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
	"strings"

	xj "github.com/basgys/goxml2json"
)

/*
#! /bin/bash

set -e
set -u

rawraw="$( \
   curl "https://www.namesilo.com/api/dnsListRecords?version=1&type=xml&key=7a26bd4b7aedbc6c44f56af38&domain=blapointe.com" 2> /dev/null \
   | xq .namesilo \
)"
echo $rawraw | jq . >&2
ip="$( \
   echo "$rawraw" \
   | jq -r .request.ip \
)"
echo ip $ip >&2
raw="$( \
   echo "$rawraw" \
   | jq -c '.reply.resource_record[]' \
   | grep \*.home.blapointe \
   | jq -c . \
   | jq -c . \
)"
echo raw $raw >&2
rid="$( \
   echo "$raw" \
   | jq -r .record_id \
)"
ip="$(curl icanhazip.com 2> /dev/null)"
echo $rid
echo curl "https://www.namesilo.com/api/dnsUpdateRecord?version=1&type=xml&key=7a26bd4b7aedbc6c44f56af38&domain=blapointe.com&rrid=$rid&rrhost=*.home&rrvalue=$ip&rrttl=7207"
curl "https://www.namesilo.com/api/dnsUpdateRecord?version=1&type=xml&key=7a26bd4b7aedbc6c44f56af38&domain=blapointe.com&rrid=$rid&rrhost=*.home&rrvalue=$ip&rrttl=7207" 2> /dev/null \
   | xq .
*/

func main() {
	domain := flag.String("domain", "blapoionte.com", "domain to modify")
	subdomain := flag.String("prefix", "*.home.", "subdomain to modify")
	flag.Parse()
	uri := "https://www.namesilo.com/api/dnsListRecords?version=1&type=xml&key=7a26bd4b7aedbc6c44f56af38&domain=" + *domain
	log.Printf("uri=%s", uri)
	resp, err := http.Get(uri)
	if err != nil {
		panic(err)
	}
	b, _ := ioutil.ReadAll(resp.Body)
	buff := bytes.NewBuffer(b)
	js, err := xj.Convert(buff)
	if err != nil {
		panic(err)
	}
	var rawraw struct {
		Namesilo struct {
			Request struct {
				IP string `json:"ip"`
			} `json:"request"`
			Reply struct {
				ResourceRecord []struct {
					Host     string `json:"host"`
					RecordID string `json:"record_id"`
				} `json:"resource_record"`
			} `json:"reply"`
		} `json:"namesilo"`
	}
	if err := json.NewDecoder(strings.NewReader(js.String())).Decode(&rawraw); err != nil {
		panic(err)
	}
	log.Printf("looking for host == %s", *subdomain+*domain)
	for _, v := range rawraw.Namesilo.Reply.ResourceRecord {
		if v.Host == *subdomain+*domain {
			rrid := v.RecordID
			ip := rawraw.Namesilo.Request.IP
			log.Println(rrid, ip)
			url := fmt.Sprintf("https://www.namesilo.com/api/dnsUpdateRecord?version=1&type=xml&key=7a26bd4b7aedbc6c44f56af38&domain="+*domain+"&rrid=%s&rrhost="+strings.TrimRight(*subdomain, ".")+"&rrvalue=%s&rrttl=3600", rrid, ip)
			log.Printf("updating via %s", url)
			resp, err := http.Get(url)
			b, _ := ioutil.ReadAll(resp.Body)
			js, _ := xj.Convert(bytes.NewBuffer(b))
			log.Printf("%v: %s", err, js)
			return
		}
	}
	log.Println(rawraw)
}