#!/usr/bin/env sh
#
# Send Pushover messages from cli
# Based on https://github.com/mrusme/dotfiles/blob/master/usr/local/bin/pushover
#
# Modified by Ismo Vuorinen <https://github.com/ivuorinen> 2023

__pushover_usage()
{
  printf "pushover <options> <message>\n"
  printf " -c <callback>\n"
  printf " -d <device>\n"
  printf " -D <timestamp>\n"
  printf " -e <expire>\n"
  printf " -p <priority>\n"
  printf " -r <retry>\n"
  printf " -t <title>\n"
  printf " -T <TOKEN> (required if not in 'PUSHOVER_TOKEN' env)\n"
  printf " -s <sound>\n"
  printf " -u <url>\n"
  printf " -U <USER> (required if not in 'PUSHOVER_USER' env)\n"
  printf " -a <url_title>\n"
  return 1
}

__pushover_opt_field()
{
  field=$1
  shift
  value="${*}"
  if [ -n "${value}" ]; then
    printf "%s \"%s=%s\"\n" "-F" "$field" "$value"
  fi
}

__pushover_send_message()
{
  device="${1:-}"

  curl_cmd="\"${CURL}\" -s -S \
    ${CURL_OPTS} \
    -F \"token=${TOKEN}\" \
    -F \"user=${USER}\" \
    -F \"message=${message}\" \
    $(__pushover_opt_field device "${device}") \
    $(__pushover_opt_field callback "${callback}") \
    $(__pushover_opt_field timestamp "${timestamp}") \
    $(__pushover_opt_field priority "${priority}") \
    $(__pushover_opt_field retry "${retry}") \
    $(__pushover_opt_field expire "${expire}") \
    $(__pushover_opt_field title "${title}") \
    $(__pushover_opt_field sound "${sound}") \
    $(__pushover_opt_field url "${url}") \
    $(__pushover_opt_field url_title "${url_title}") \
    \"${PUSHOVER_URL}\""

  response="$(eval "${curl_cmd}")"
  printf "%s\n" "$response"

  # Parse response status. Expect JSON like: {"status":1,"request":"..."}
  if echo "$response" | grep -q '"status"[[:space:]]*:[[:space:]]*1'; then
    r=0
  else
    r=1
  fi

  if [ "$r" -ne 0 ]; then
    # Extract possible error message from JSON
    err=$(echo "$response" | grep -o '"errors".*' | sed 's/"errors"[:,\[]//g' | tr -d '[]"')
    [ -n "$err" ] && printf "%s: %s\n" "$0" "$err" >&2
    printf "%s: Failed to send message\n" "$0" >&2
  fi

  return "$r"
}

CURL="$(command -v curl)"
PUSHOVER_URL="https://api.pushover.net/1/messages.json"
TOKEN=$PUSHOVER_TOKEN
USER=$PUSHOVER_USER
CURL_OPTS=""
devices=""
optstring="c:d:D:e:p:r:t:T:s:u:U:a:h"

OPTIND=1
while getopts ${optstring} c; do
  case ${c} in
    c)
      callback="${OPTARG}"
      ;;
    d)
      devices="${devices} ${OPTARG}"
      ;;
    D)
      timestamp="${OPTARG}"
      ;;
    e)
      expire="${OPTARG}"
      ;;
    p)
      priority="${OPTARG}"
      ;;
    r)
      retry="${OPTARG}"
      ;;
    t)
      title="${OPTARG}"
      ;;
    T)
      TOKEN="${OPTARG}"
      ;;
    s)
      sound="${OPTARG}"
      ;;
    u)
      url="${OPTARG}"
      ;;
    U)
      USER="${OPTARG}"
      ;;
    a)
      url_title="${OPTARG}"
      ;;

    [h\?])
      __pushover_usage
      exit 1
      ;;
  esac
done
shift $((OPTIND - 1))

if [ "$#" -lt 1 ]; then
  __pushover_usage
  exit 1
fi
message="$*"

if [ ! -x "${CURL}" ]; then
  printf "CURL is unset, empty, or does not point to curl executable.\n \
    This script requires curl!\n" >&2
  exit 1
fi

devices="$(printf "%s" "${devices}" | xargs -n1 | sort -u)"

if [ -z "${devices}" ]; then
  __pushover_send_message
  r=${?}
else
  for device in ${devices}; do
    __pushover_send_message "${device}"
    r=${?}
    if [ "${r}" -ne 0 ]; then
      break
    fi
  done
fi
exit "${r}"