package main

import (
	"encoding/json"
	"fmt"
	"io"
	"log"
	"net/http"
	"os"
	"strings"
)

const (
	updateUrl = "https://api.porkbun.com/api/json/v3/dns/editByNameType/awstinchubb.com/A"
	getUrl    = "https://api.porkbun.com/api/json/v3/dns/retrieveByNameType/awstinchubb.com/A"
	apiKey    = "DDNS_API_KEY"
	secretKey = "DDNS_SECRET_KEY"
)

type Record struct {
	Id      string
	Name    string
	Type    string
	Content string
	Ttl     string
	Prio    string
	Notes   string
}

type ResponseBody struct {
	Status     string
	Cloudflare string
	Records    []Record
}

func main() {
	ip := getIp()
	record := getRecord()

	if ip != record.Content {
		updateRecord(ip)
	}
}

func getRecord() Record {
	body := strings.NewReader(fmt.Sprintf("{\"secretapikey\": \"%s\", \"apikey\": \"%s\"}", os.Getenv(secretKey), os.Getenv(apiKey)))

	resp, err := http.Post(getUrl, "application/json", body)
	if err != nil {
		log.Fatal(err)
	}
	defer resp.Body.Close()

	resBodyBites, err := io.ReadAll(resp.Body)
	var resBody ResponseBody
	json.Unmarshal(resBodyBites, &resBody)
	return resBody.Records[0]
}

func updateRecord(ipAddr string) {
	body := strings.NewReader(fmt.Sprintf("{\"secretapikey\": \"%s\", \"apikey\": \"%s\", \"content\": \"%s\", \"ttl\": \"600\"}", os.Getenv(secretKey), os.Getenv(apiKey), ipAddr))

	resp, err := http.Post(updateUrl, "application/json", body)
	if err != nil {
		log.Fatal(err)
	}
	defer resp.Body.Close()
}

func getIp() string {
	resp, err := http.Get("https://icanhazip.com")

	if err != nil {
		log.Fatal(err)
	}
	defer resp.Body.Close()
	resBodyBites, err := io.ReadAll(resp.Body)
	return strings.TrimSpace(string(resBodyBites))
}