# assuming you are on macOS with zsh;
# assumes your roku is also setup to use Airplay (easier method to discover instead ARP discovery which requires sudo)
# requirements: gnu-coreutils timeout; curl;
#   `brew install coreutils curl` 
# 
# usage: 
#   roku-keypress [remote-button (default = play if not specified)]
#  
# for all available keypress values see 
# https://developer.roku.com/docs/developer-program/dev-tools/external-control-api.md#keypress-key-values
# 
# output: 
#   the current state of the roku 

function roku-keypress() {
  local ROKU_NAME='jRok'

  function __run_with_timeout() {
    gtimeout --foreground 0.25s "$@"
  }

  function _roku_dns_local() {
    __run_with_timeout dns-sd -L "${ROKU_NAME}" _airplay local. | grep 'reached' | tr ' ' '\n' | grep '.local.' | awk '{gsub(/:7000/,"")}1' | tail -1
  }

  function _roku_ip() {
    local domain=$(_roku_dns_local)
    [[ -z "${domain}" ]] &&
      echo '' && return 1;
      
    # TODO: cache this output on simple file store for a little, the delay from running dns-sd can feel laggy
    local output=$(__run_with_timeout dns-sd -Gv4v6 $(_roku_dns_local))
    echo $output | awk '{print $6}' | tail -1
  }
  
  local ip=$(_roku_ip)
  if [[ -z "${ip}" ]]; then
    echo "⚠️  unable to find device ($ROKU_NAME)"
    return 1
  fi
  local key=${1:-"play"}
  curl -d '' "http://$ip:8060/keypress/$key"
  echo ""
  echo -n '📺 ' && curl -s "http://$ip:8060/query/media-player" | xmllint --xpath '/player/@state' -
}

roku-keypress $@