#!/usr/bin/env bash
# Usage: {script} TLD_FILENAME
# Update list of TLD

set -euo pipefail

declare -r IFS=$'\n'
declare -r URL="https://www.currency-iso.org/dam/downloads/lists/list_one.xml"
declare -r RULE="${1}"
declare -r TEMPORARY_XML=$(mktemp)

download_list()
{
  echo "Downloading list from '${URL}'"
  curl --silent --location "${1}" --output "${2}"
}

update_currency_codes()
{
  local -r filename_rule="${1}"
  local -r filename_xml="${2}"
  local -r number_of_items=$(grep "<CcyNtry>" "${filename_xml}" | wc --lines)
  local -r temporary_rule=$(mktemp)

  echo "Updating list in '${filename_rule}'"
  {
    sed -n '/^</,/    private/p' "${filename_rule}"
    for index in $(seq 1 ${number_of_items}); do
      local name=$(xml sel -t -v "//CcyNtry[${index}]/CcyNm" < "${filename_xml}")
      local code=$(xml sel -t -v "//CcyNtry[${index}]/Ccy" < "${filename_xml}")
      echo "        '${code}', // ${name}"
    done
    sed -n '/^    ]/,/^}/p' "${filename_rule}"
  } > "${temporary_rule}"

  mv "${temporary_rule}" "${filename_rule}"
}

download_list "${URL}" "${TEMPORARY_XML}"
update_currency_codes "${RULE}" "${TEMPORARY_XML}"