#!/bin/bash

set -e

today=$(date +%d/%m/%Y)
prev_week=$(date +%d/%m/%Y -d '-7 day')

usd=R01235

cc=($(curl --no-progress-meter "https://www.cbr.ru/scripts/XML_dynamic.asp?date_req1=$prev_week&date_req2=$today&VAL_NM_RQ=$usd" | \
  sed -e "s/<[A-Z]/\n\0/g" | \
  grep Value | \
  sed -e "s#<\/\?\w\+>##g" | \
  sed -e "s/,/./g"))

diff=$(echo ${cc[-2]} ${cc[-1]} | awk '{ print $1 - $2 }')

case $1 in
  "diff")
    echo $diff
    ;;

  "cur")
    echo ${cc[-1]}
    ;;

  *)
    echo "${cc[-1]} ($diff)"
    ;;
esac

exit 0