#! /usr/bin/env bash

set -euo pipefail

ZONE_ID="$(cat .var/zone_id)"
DNS_RECORD="$(cat .var/dns_record)"
CACHED_PUBLIC_IP="$(cat .var/cached_public_ip)"
AUTHORIZATION="$(cat .var/bearer)"

IP_URL="ifconfig.me/ip"
SEND_TELEGRAM="$(pwd)/send_telegram"
LOG_FILE_PARENT="/var/log/cloudflare_update"
LOG_FILE="${LOG_FILE_PARENT}/$(date +%d_%m_%Y_update_dns).log"

mkdir -p "${LOG_FILE_PARENT}"

function info() {
	echo "$(date --iso-8601=minutes) CLOUDFLARE_DNS_UPDATE [INFO]: ${*}"
	echo "$(date --iso-8601=minutes) CLOUDFLARE_DNS_UPDATE [INFO]: ${*}" >> "${LOG_FILE}"
}
function error() {
	echo "$(date --iso-8601=minutes) CLOUDFLARE_DNS_UPDATE [ERROR]: ${*}"
}


function check_new_ip() {
	local new_ip
	new_ip="$(curl -s ${IP_URL})"
	if [[ "${new_ip}" == "${CACHED_PUBLIC_IP}" ]]; then
		info "Public IP has not changed from ${new_ip}. Exiting..."
		exit 0;
	else
		info "Public IP has changed from ${CACHED_PUBLIC_IP} to ${new_ip}. Updating records..."
    "${SEND_TELEGRAM}" "Public IP has changed from ${CACHED_PUBLIC_IP} to ${new_ip}. Updating records..."
    CACHED_PUBLIC_IP="${new_ip}"
    echo "${new_ip}" > .var/cached_public_ip
	fi
}

check_new_ip

curl_answer="$(curl --request PATCH \
  --url "https://api.cloudflare.com/client/v4/zones/${ZONE_ID}/dns_records/${DNS_RECORD}" \
  --header 'Content-Type: application/json' \
  --header 'X-Auth-Email: ' \
  --silent \
  --data '{
  "content": "'${CACHED_PUBLIC_IP}'",
  "name": "tylencloud.com",
  "proxied": false,
  "type": "A",
  "comment": "Main Record",
  "ttl": 3600
}' \
-H "Authorization: Bearer ${AUTHORIZATION}")"

info "${curl_answer}"
"${SEND_TELEGRAM}" "$(echo ${curl_answer} | jq)"