#!/bin/bash
BAT_PATH=/sys/class/power_supply
BAT=BAT0
MODE=suspend-then-hibernate

# 0: charging
# 1: discharging/unknown
function _state() {
  f=$BAT_PATH/$BAT/status
  s=1 
  if [ -e $f ]; then
    s=$(grep -c Discharging $f)
  fi
  echo $s
}

function _suspend() {
  state=$(_state)
  force=${1:-0}
  echo "INFO: state: $state, force: $force"
  if [ $state -eq 1 -o $force -eq 1 ]; then
    systemctl $MODE
  else
    echo "ERROR: state: $state, force: $force"
  fi
}

case $1 in
  suspend)
    _suspend 0
    ;;
  force)
    _suspend 1
    ;;
  *)
    echo "ERROR: invalid command: \"$1\""
    echo "possible options: [suspend|force]"
    ;;
esac