#!/usr/bin/env bash
set -eo pipefail

# fallback if empty
if [[ -z "$PINENTRY_USER_DATA" ]]; then
  # TODO: add your fallback pinentry here
  exec <fallback-pinentry> "$@"
fi

if [[ "$PINENTRY_USER_DATA" != "tmux" ]]; then 
  echo "Unsupported pinentry type in PINENTRY_USER_DATA"
  exit 1
fi

DESCFILE=$(mktemp)

cleanup() {
  rm -f "$DESCFILE"
}
trap cleanup EXIT

prompt="PIN:"

echo "OK Please go ahead"
while read cmd rest; do
  case "$cmd" in
    SETDESC)
      echo "$(tput setaf 8)$(echo "$rest" | sed -e 's/%0A/\n/g' -e 's/%22/"/g')$(tput sgr0)" > $DESCFILE
      echo "OK"
      ;;
    SETPROMPT)
      prompt="$(tput smul)$rest$(tput sgr0)"
      echo "OK"
      ;;
    GETPIN)
      PIPE=$(mktemp -u)
      mkfifo "$PIPE"
      chmod 600 "$PIPE"

      tmux display-popup -w 70 -h 7 -E "bash -c 'cat $DESCFILE; echo -n \"$prompt \"; read -s pw; echo \$pw > $PIPE'" &
      PIN=$(<"$PIPE")
      rm -f "$PIPE"
      echo "D $PIN"
      echo "OK"
      ;;
    BYE)
      echo "OK"
      exit 0
      ;;
    *)
      echo "OK"
      ;;
  esac
done