#!/usr/bin/env bash

((hours = minutes = seconds = 0))

while getopts "h:m:s:" flag; do
  case "${flag}" in
  h) hours="${OPTARG}" ;;&
  m) minutes="${OPTARG}" ;;&
  s) seconds="${OPTARG}" ;;&
  h | m | s)
    re='^[0-9]+$'
    if ! [[ "${OPTARG}" =~ $re ]]; then
      printf 'Error: flag "-%s" expected an integer, instead found "%s"\n' "${flag}" "${OPTARG}"
      exit 1
    fi
    ;;
  *)
    printf 'invalid flag: -%s\n' "${flag}"
    exit 1
    ;;
  esac
done

tick() {
  if [[ "${1}" -ge 3600 ]]; then
    timer_display="$(date -d@"${1}" -u +%H:%M:%S)"
  else
    timer_display="$(date -d@"${1}" -u +%M:%S)"
  fi
  printf '%s\n' "${timer_display}"
  if [[ "${1}" -gt 0 ]]; then
    sleep 1
    return 0
  else
    return 1
  fi
}

#hours=1
#minutes=0
#seconds=1

((total_s = original_time = $((seconds + (minutes * 60) + (hours * 3600)))))

#echo "${total_s}"

while tick "${total_s}"; do ((total_s--)); done
notify-send --urgency=critical --icon=/usr/share/icons/Adwaita/symbolic/status/alarm-symbolic.svg 'Timer elapsed!' "Timer set for $(date -d@"${original_time}" -u +%H:%M:%S) has completed"
if [[ -f "/usr/share/sounds/ocean/stereo/alarm-clock-elapsed.oga" ]]; then
  paplay /usr/share/sounds/ocean/stereo/alarm-clock-elapsed.oga
fi